W7iuv Loop

Article will appear in QST, and it currently is schedule for the March 2021 issue. Posted 11/27/12 2:46 AM, 29 messages. SOLDERED Preamplifier for Magnetic Hula Loop HF Antenna AD8129. com/user/loughkb?sub_confirmation=1If you want me to. The second recent project was a preamplifier for a double half delta loop DHDL receiving antenna based on a design by W7IUV. Search for: Homebrew double zepp antenna. 3543-3593-42-40. E-FIELD PROBE ANTENNA. Amplifier AD8129 for Active Magnetic HF Antenna 1MHz-20MHz for Hula Loop from $12 More. RX Loops deliver strongest signals in the direction of the plane of the loop, and sharp nulls broadside to that plane. Un ensemble avec sa ligne pour le rendre multibande et peu directif. 5 ft X 5 ft Mini Receiving Loop. While the Pennant is easier to build, the Flag is symmetrical and therefor adaptable to a rotatable configuration. I've got a hunch that the Hiletgo is going to rival the Wellgood boards at a much lower cost and less hassle. Whether you are a professional or hobbyist, a preamp kit is a great way to add custom features and specifications to your home stereo or musical instrument systems. After moving to Arizona in 1971, I was issued W7IUV. SoftRock connected to normal antenna system, a NE facing K9AY with W7IUV pre-amp. N4PN, aside from turning in the number one single-operator score in the 1978 contest, now holds the Southeastern Divi-sion single op record. The tenth Stew Perry TBDC contest was the biggest of them all. Уважаемые посетители! Информация, размещенная на нашем сайте, освещает работу Украинского QRP клуб. The derivation which follows is a variation of Belrose's classical derivation for ferrite rod loop antennas, “Ferromagnetic Loop Aerials,” Wireless Engineer, February 1955, 41– 46. com in a single category. This loop is a "shielded-magnetic loop" which means that nearly all of the loop is enclosed in a non-ferrous metal tube, in this case, aluminum tubing. DX LISTENING DIGEST 15-52, December 30, 2015 Incorporating REVIEW OF INTERNATIONAL BROADCASTING edited by Glenn Hauser, http://www. If someone post's your copyrighted kit, we will remove the post(s) on request. Band conditions no great shakes considering the state of Sunspot Cycle. " "Good afternoon," said the stranger, regarding him--as Mr. The main category is Antenna for 160 meters band that is about 160 meters band antenna. While the Pennant is easier to build, the Flag is symmetrical and therefor adaptable to a rotatable configuration. 50 w,,1 x 13b2,160 watts,elevation. However care has to be taken in order to ensure that no excessive noise will be introduced into the system by adding an amplifier. Note, this isn’t a build I suggest for a newbie since the antenna itself is fairly complex by itself but if you’re willing or able to learn it’s a good match imo. Gamma Match 21 Mhz. Excellent! The W7IUV Preamp. This preamplifier is generally used with receiving antennas (Dipole, Loop, Long Wire, Beverage, etc) in the amateur radio bands (160m, 80m, 40m, etc). When I said 20db of gain, it was actually 10db. This is very simply preamplifier module with 2N5109 transistor based on W7IUV design. 2 m dish helix fed WA8WBP Ralph 1. Just for record i have included a list of OSCAR-13 operators with their call letters and antennas used for downlink Mode-S from 2400. 8 kHz het against 774. 6 m dish helix fed NW7N Larry 0,6 m dish helix fed WA7ABP Lynn 1. Search for: Homebrew double zepp antenna. The basic Waller has only a ~13 foot (4m) turning radius. I forgot to factor out the insertion loss. Download this file. Avec balun à air 4/1. As far as contest statistics go, several bright spots, in the form of new All-Time Division Records, appeared. 144 MHz Hybrid LNA - W6IOJ. The RX vertical appears to perform well at first glance, NDBs received on my loop and E-Probe were of equal or better strength with similiar daytime noise. Then used electrical tape to join all PVC at the center cross point. Loop Antennas 5-1 A loop antenna is a closed-circuit antenna—that is, one in which a conductor is formed into one or more turns so its two ends are close together. W7AMI - Callsign Lookup by QRZ Ham Radio qrz. hi all, Here is the last uptodate of the OSCAR-13 Mode-S users list. =20 Anyone ID the carrier/mod on 29. Another session of excellent activity in North America on CW and FST4 with a bit of JT9 thrown in but QSB and weird propagation continue and many reported elevated noise levels; Trans-Equatorial openings included reports for KB8U, PA0LSB, DC0DX, EA4GHB and EA5DOM at LU8DPM; Healthy night of trans-Atlantic reports of North American stations including WA3U, W7XU, K3MF, K0KE, KB8U, W3TS and a. Un aiuto in piu' per la ricezione. This link is listed in our web site directory since Sunday May 1 2005, and till today "W7IUV 160 Meters vertical" has been followed for a total of 20135 times. W7IUV Beverage preamplifier PCB for experimenters 2N5109 or DCP68 transistor. p Torino AD. hard-core-dx. Some people who have not actually compared the signal output of a flag antenna to other small antennas have. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. Listed under the Antennas/160M category that is about Antenna for 160 meters band. 6wl,1200 watts,xpol, 3y0pi,68. (W7IUV version); raised, 4 loop K9AY, 6x19x6 m Ewe 135º, 14 m low noise LF/MF Vertical. If you have a transistor type that you think will work and want it tested, contact me. And I keep getting talked > out of it. This time he will use an old 2 m TVRO dish with 50 to 75 W. My piece was 10' long, which gave an ending diameter of 40" (~1 Meter). A full wave 160 meter loop fed with open wire line and a tuner will also work all those bands, and is about 132' on a side, if you have a large lot. Volendo è possibile amplificare il loop tramite il preamplificatore di W7IUV descritto in precedenza anche se dalle prime prove eseguite, alimentando tramite circa 40 metri di RG 213 la preamplificazione pare non si essere estremamente necessaria. Dynamic Range tests of WSJT X and WSPR on 630m using AGC with IC-7300. W1QA and I put a lot of work into getting the station. ----- "RUS-DX" # 851 Broadcasting of Russia, countries of CIS and Baltiya. Far Circuits. W7IUV 160 Meters vertical 90 foot tall top loaded vertical for 160 meters 6 Meter 5/8 Wave Vertical Antenna The G3JVL 6 Meter ground plane vertical is a compact antenna that is ideal for portable operations. Loop Antenna Push-Pull FET LNA. Il trasformatore T2 è realizzato avvolgendo 10 spire bifilari di filo da 30 AWG isolato in kynar (quello per wire wrap) su un nucleo FT 50-43. Special thanks to W7IUV for making these plans available to the Amateur Radio Community. From reception of. Un aiuto in piu' per la ricezione. While the Pennant is easier to build, the Flag is symmetrical and therefor adaptable to a rotatable configuration. Panorama radiofonico internazionale n. EUR 4,10 + spedizione. com) was given a gain test as well: it has lower gain (11 dB typical). Even with my earth-electrode "antenna" in t= he ground Italy, Spain, Norway and many other countries were spotted last n= ight on my "deaf" FT817 on 472kHz WSPR. As a final note, after running the two loops for almost 2 years, I built and installed a W7IUV broadband preamp at the feedpoint of the North-South loop. I expect I'll have to take more care with protecting the JFET device. I was first licensed as KN9VBS in 1959 and soon upgraded to K9VBS. S-Band Ultra Low Noise Amplifier. licciardimmobiliare. 2 meter loop. Ewe Antenna at KC4HW It has been reported that the best way to tune an array for best F/B is to find a medium-wave BC transmitter in the back of the antenna. 3: Loop Antennas for HF Reception Contributed by: B. Sits 1m above ground. 5dB , but may be better with the low output impedance of the loop. I no longer have the KAZ loop, but I'm going to build another one. The sockets benchmark uses loop. 3603——37 3613——35 3623——32 3629. I’ve been thinking of building a couple as a general interest project and today turned out to be THE day to rock and roll. This will feed into a W7IUV pre-amp. 1 45444 CG (Carlos Gonçalves, Rx & site: JRC NRD- 545DSP & PERSEUS sdr; Quantum Phaser, homemade amp. If someone post's your copyrighted kit, we will remove the post(s) on request. Elongated Loop Summary • Pros – Small footprint – Simplicity – Can be phased to improve performance – Much better than listening to a vertical! • Cons – Insensitive, may require a preamp – Directivity not as good as a Beverage – Feedline prone to noise pickup Although not as good as Beverage antennas, Elongated Loops offer. The W7IUV link is down also. But still, quite an improvement for RX on the. uk/~equinox/. The aluminum tends to somewhat shield the loop from certain types of RF noise but, being non-magnetic, allows the loop to respond to the magnetic component of the EM signal. 144 MHz / 432 MHz GaAs LNA - OZ1PIF. Shipped with USPS Priority Mail. Das Platinenlayoutfile ging leider verloren, aber mit dem angegebenen Schaltplan ist die Platine sicherlich rasch wieder erstellt. Everything is documented in RxAnt_Flags_2. antennas can be made for 160m by pre-amplifying each loop's output before the lossy 180 degree mixing. 34 W7IUV 35 W7KNT 36 W7UT 37 W9RM. If you have a transistor type that you think will work and want it tested, contact me. Contribute. When I said 20db of gain, it was actually 10db. Takovou anténu zkonstruoval Tony Preedy, G3LNP úpravou známé antény K9AY Loop [1] a dosáhl s ní velmi zajímavých výsledků - v odpoledních hodinách ve svém QTH v Shrewsbury poslouchal na 1,8 MHz polskou stanici, ačkoli ze stejného směru přicházely signály německé stanice v síle S9. Moderate signal strength with minimal fading. Helaas was ik vergeten het digitale waterpas naar binnen te halen en in de loop van de nacht begon het te regenen en te stormen. // this data may not be re-used in another website or automated system without prior permission - [email protected] An icon used to represent a menu that can be toggled by interacting with this icon. 38 e,frank,2xmbi 6. Er liefert bei einem Ausgangs-IP3 von 41 dBm eine Verstärkung von 20 dB. I no longer have the KAZ loop, but I'm going to build another one. Even with my earth-electrode "antenna" in t= he ground Italy, Spain, Norway and many other countries were spotted last n= ight on my "deaf" FT817 on 472kHz WSPR. Another loop antenna - The RadioBoard Forums. 2kHz when the weather is more tolerable and mod the input match to the orig= inal m0bmu amp/filter. terminated loop antenna. Pretty good evening propagation for North America including transcontinental JT9 QSO's for K9KFR and W7IUV but debilitating noise was all over the place; Good night in the Pacific for trans-Pacific and Pacific Rim openings including K5DNL -> VK4YB // VK4YB -> W7IUV, KR7O, KR6LA, KJ6MKI, KPH, AI6VN/KH6, K9FD, JA1PKG, 7L1RLL4, JH3XCU, JA3TVF. De volumenaam van station Z is ? Het volumenummer is 011C-01FC Map van Z:\datasheet\Comm 23-10-2006 15:42. Everything is documented in RxAnt_Flags_2. // this data may not be re-used in another website or automated system without prior permission - [email protected] (W7IUV version); 20 m T2FD, 30 m inv. Schema molto semplice e materiali molto comuni, si assembla in poco più di un'ora. 0 m dish helix fed KE7NR Don 2 x 45 loop yagi N7RYW Bill 2. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. W7iuv Loop W7iuv Loop nokia rrh He was, he says, "taken aback. My own 10' tuned air-core loop made an excellent receive antenna on 160m, even though the loop was tuned to around 300KHz! Although signal strength was several S-units below my transmitting antenna, the loop was extremely quiet and weak signals were much easier to copy. com - id: 3da0b8-NmMzM. html Return to Home Page. There is a biography available on QRZ. Receive Loop with W7IUV Preamp - W1AEX. Low Band High Performance Preamp Larry - W7IUV Revision 5 copyright 19982009 Note: Please 1 Flags at IV3PRK: from West Coast to Florida models Upgrading from the rotatable Flag by W7IUV, and the original K6SE design, to the "Waller Flag", an end-fire rotatable two loops array by NX4D and N4IS. 4733 lines (4732 with data), 179. Gain is up to 18dB and there is also build in variable ATT. 5 foot square shielded loop which is located in my shack, and the MC1350 IC gets permanently altered when I transmit on 160 meters using my 53 foot base loaded vertical. ham radio Add category. The derivation which follows is a variation of Belrose's classical derivation for ferrite rod loop antennas, “Ferromagnetic Loop Aerials,” Wireless Engineer, February 1955, 41– 46. It runs off 12vdc and draws 40ma current. =20 Anyone ID the carrier/mod on 29. net via DXLD) ** U S A. 23-10-2006 15:56. Ewe Antenna at KC4HW It has been reported that the best way to tune an array for best F/B is to find a medium-wave BC transmitter in the back of the antenna. Préamplicateur W7IUV. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. Larry – W7IUV Revision 5 copyright 1998­2009 Note: Please read the entire document before starting to build this project. 8MHz) DX Operation: W7IUV preamplifier. I forgot to factor out the insertion loss. -----080004050105000508010406-- From [email protected] antennas can be made for 160m by pre-amplifying each loop's output before the lossy 180 degree mixing. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. We think a single Op Amp with two 180 degree inputs, and the hybrid combiner can be made in one small unit. About W7IUV 160 Meters vertical. org >=3B To: [email protected]= eep. com offer the quality w7iuv preamplifier on sale with worldwide free shipping. With the xonar DX set to 192khz scan rate, the actual upper limit on the readings was 3629. I used a 4" plastic electrical junction box at the bottom. >=3B Date: Fri=2C 1 Apr 2016 04:58:20 +0= 000 >=3B From: [email protected] Wanneer de regentijd ons geen parten gespeeld zou hebben, dan hadden beslist meer verbindingen gevolgd. Some people who have not actually compared the signal output of a flag antenna to other small antennas have. When I said 20db of gain, it was actually 10db. A really hot active antenna for RX only. Da le soproga ne izve, HI! 6. a Broadband Active Loop Antenna, looking at the. Moderate signal strength with minimal fading. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. antennas: in front the K9AY loop, than the 4-squareRx mini-array, the southern group of Pennants, the shunt-fed tower and, on the back, the rotatable Flag. Volendo è possibile amplificare il loop tramite il preamplificatore di W7IUV descritto in precedenza anche se dalle prime prove eseguite, alimentando tramite circa 40 metri di RG 213 la preamplificazione pare non si essere estremamente necessaria. I was first licensed as KN9VBS in 1959 and soon upgraded to K9VBS. 5dB , but may be better with the low output impedance of the loop. Originally the preamp gain pot causes. Inoltre per chi si diletta nel radioascolto in onde medie uno stilo verticale e’ ulteriormente di cattivo ausilio. 5dB , but may be better with the low output impedance of the loop. Ho fatto diverse prove con il mio loop fatto con coassiale TV da 75 a forma romboidale lato 1,52 metri per i 160 metri Accordato a 1830 con una serie di condensatori ceramici fissi ed un variabile da 400 pF. Broadband Active Loop for Car Roof Use. outdoor loop, amfmtvdx at qth. poi a pag 7-89 di Low Band DX'ing la tua antenna è descritta sotto il nome di diamond-shaped loop, che non necessariamente deve essere equilatero, puoi anche allungarlo da una parte o dall' altra a seconda dei materiali che hai a disposizione e ON4UN consiglia di tenerla a un paio di metri da terra per un migliore rendimento. Elongated Loop Summary • Pros – Small footprint – Simplicity – Can be phased to improve performance – Much better than listening to a vertical! • Cons – Insensitive, may require a preamp – Directivity not as good as a Beverage – Feedline prone to noise pickup Although not as good as Beverage antennas, Elongated Loops offer. Free R Service Holland - pir. Ferreira, PY3PR P. The second recent project was a preamplifier for a double half delta loop DHDL receiving antenna based on a design by W7IUV. With the xonar DX set to 192khz scan rate, the actual upper limit on the readings was 3629. Al Penney VO1NO / VE3. Wanneer de regentijd ons geen parten gespeeld zou hebben, dan hadden beslist meer verbindingen gevolgd. 5706 lines (5705 with data), 242. I used another piece of PVC, 1 inch, to support the loop at the top and into the rotator. proximity to the mast and the coax loop, which stuck out horizontally at such high elevations. – TX/RX leaking – Polarization filter HWF – Twisted pair lines – HWF single loaded loop construction – HWF dual loaded loop construction – Multiples loaded loops RX arrays. W7iuv Loop - Cieffebiogqoa. You can use it as high IP preamplifier for RX antennas (beverage, DHDL, flag etc). List of related. Delta Loop 3,5 MHz. Volendo è possibile amplificare il loop tramite il preamplificatore di W7IUV descritto in precedenza anche se dalle prime prove eseguite, alimentando tramite circa 40 metri di RG 213 la preamplificazione pare non si essere estremamente necessaria. Loops can be divided into two general classes,. Flag Antenna Construction and Test Results. Helaas was ik vergeten het digitale waterpas naar binnen te halen en in de loop van de nacht begon het te regenen en te stormen. Response rolled off smoothly to 14. As a final note, after running the two loops for almost 2 years, I built and installed a W7IUV broadband preamp at the feedpoint of the North-South loop. 9917 kHz; and KLFF is on 889. COM for this callsign!. Ferreira, PY3PR P. Free R Service Holland - pir. W7IUV vi mostra come fare questa antenna girevole x ricezione. 2017-01-29 10:36 WE2XPQ 0. Then used electrical tape to join all PVC at the center cross point. I elected to start from just the schematic and comprehensive design notes, and also wanted to try to develop some new skills useful in future projects. Pretty good evening propagation for North America including transcontinental JT9 QSO's for K9KFR and W7IUV but debilitating noise was all over the place; Good night in the Pacific for trans-Pacific and Pacific Rim openings including K5DNL -> VK4YB // VK4YB -> W7IUV, KR7O, KR6LA, KJ6MKI, KPH, AI6VN/KH6, K9FD, JA1PKG, 7L1RLL4, JH3XCU, JA3TVF. I’ve been thinking of building a couple as a general interest project and today turned out to be THE day to rock and roll. Disegni e foto, oltre a una schematica del pre-amp. The loop is superior between 500 kHz and 15 MHz, and the LNV with preamp is my best antenna above 15 MHz. The Recteangular Loop or Flag Antenna, Chapter 7-87, 『ON4UN's Low Band DXing - 4th Edition』,2005, ARRL. 144 MHz / 432 MHz GaAs LNA - OZ1PIF. Volendo è possibile amplificare il loop tramite il preamplificatore di W7IUV descritto in precedenza anche se dalle prime prove eseguite, alimentando tramite circa 40 metri di RG 213 la preamplificazione pare non si essere estremamente necessaria. com/user/loughkb?sub_confirmation=1If you want me to. , 200 m 270º/90º Bev. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. Ok, senior moment. A variant of this amplifier, the ECP-1 Elbert County Preamplifier (made by Lance Johnson Engineering, e-mail: [email protected] This preamplifier is generally used with receiving antennas (Dipole, Loop, Long Wire, Beverage, etc) in the amateur radio bands (160m, 80m, 40m, etc). com/db/W7AMI. Уважаемые посетители! Информация, размещенная на нашем сайте, освещает работу Украинского QRP клуба - UR-QRP Club. Mi ha veramente sbalordito, con il loop in casa , appoggiato sulla scrivania, ricevo segnali in OL, OM, 160, 80 e 40 metri identici ed a volte più forti e più puliti dei dipoli che ho sul tetto. evidentemente quello di adattare la bassa impedenza del loop ai 50 Ohm d’ingresso del preamplificatore basato sullo schema di W7IUV inserito in una scatola metallica da 50x50mm. =20 My limitation are a noisy over head power line some 200m away which I cant m= itigate with the present tools. Amplifier AD8129 for Active Magnetic HF Antenna 1MHz-20MHz for Hula Loop from $12 More. W6YVO Dick 1,2 m dish AA7A Ed 0. Portable Flag (Terminated Loop) Antenna For MF/HF Radio Direction Finding By Don Kirk (wd8dsb) Just basic details will be shared for now as I'm working on an Article for QST which has been accepted for publication. PREVIOUS PJ2T RESULTS: PREVIOUS RESULTS : OBJECT: Top Single-Op High Power DX Score! 2012 PJ2T Log (SO - K8ND) 1st World DX Single -Op: 137,280 - 880 - 78 (Claimed). The loops are nearly invisible, and fairly indestructible, even through the wind, snow, rain, and sun that we experience up here in the northeast. , 300 m 225º/45º Bev, radioescutas yg via DXLD) While checking my recordings I. Verticale HF a sintonia continua. K9AY loop (150 meters of new coax cable): it worked as it should, with a good F/B in the four directions, but the noise level was still worse. Search for: Homebrew double zepp antenna. Some people who have not actually compared the signal output of a flag antenna to other small antennas have. Due to it’s capabilities, it is an extremely popular device and clones are available from your preferred chinese trading platform for less than 5 Euro. 5 dB at 30 MHz. Also have 3 W7IUV amplifiers with 2SC5551 transistors. Receive Loop with W7IUV Preamp - W1AEX. Connect either the W7IUV amp output or the 2:1 transformer output (instead of sending it to the W7IUV amp) to a short coaxial cable to a plug inserted in the 1/8-inch connector jack of Radio Shack loop model 15-1853or equivalent. Il trasformatore T2 è realizzato avvolgendo 10 spire bifilari di filo da 30 AWG isolato in kynar (quello per wire wrap) su un nucleo FT 50-43. The performance increase was nothing short of amazing. Gain is up to 18dB and there is also build in variable ATT. Several years ago I noticed something similar. with news, information and resources. Portable Flag (Terminated Loop) Antenna For MF/HF Radio Direction Finding. Disegni e foto, oltre a una schematica del pre-amp. gruppomatel. Verticale HF a sintonia continua. Then used electrical tape to join all PVC at the center cross point. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow. org X-Spam-Level: X-Spam-Status: No, score=-0. 747 MHz during the lifetime of this glourious U/S transponder The power of OSCAR-13 mode-S was only 1,5 W pep and the satellite antenna was an helix with G=10 dBi and so EIRP. Response rolled off smoothly to 14. De regentijd was aangebroken; niet alleen in Port Blair maar ook in mijn digitale waterpas. Flag Antenna Construction and Test Results. com/db/W7AMI. W6YVO Dick 1,2 m dish AA7A Ed 0. This is the amateur radio station W7IUV. Ham Radio - W7IUV pre amp on my junk box magnetic loop for receiving. " John's 630m Vertical "Antenna is an 80 foot asymmetric T-top marconi with 100 foot and 200 foot legsradial system is almost 3 miles of radials connected via various busses. callsign lookup. com/profiles/zoliqe [Sledujte ma na Google+] Rádioklub Manín http://www. 8MHz) DX Operation: W7IUV preamplifier. W7IUV Beverage preamplifier PCB. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. A full wave 160 meter loop fed with open wire line and a tuner will also work all those bands, and is about 132' on a side, if you have a large lot. 34 W7IUV 35 W7KNT 36 W7UT 37 W9RM. (W7IUV version); raised, 4 loop K9AY, 6x19x6 m Ewe 135º, 14 m low noise LF/MF Vertical. Inoltre per chi si diletta nel radioascolto in onde medie uno stilo verticale e’ ulteriormente di cattivo ausilio. Excellent! The W7IUV Preamp. Published with permission; more on W7IUV's home page email [email protected] Antenna-eh. Delta Loop toutes bandes. In the backyard I constructed a rectangular wire loop with two sides of length about 30. W7IUV Beverage Pre-Amp Double Half Delta Loop (DHDL) Low Band Receiving Antenna - 14. A variant of this amplifier, the ECP-1 Elbert County Preamplifier (made by Lance Johnson Engineering, e-mail: [email protected] Hi , All Here is the last update 15 Sept 2006 of OSCAR-13 Mode-S user list. Back in the "old days", you had to get a different call sign when you moved to a new call area. KD9SV Products SV-KR Keying Relays are actually high-speed Solid State interface units that allow all amplifiers, even older amplifiers with high voltage keying circuits, to be safely connected to and keyed by newer transceivers. Da le soproga ne izve, HI! 6. Posted on Feb 6, 2014. QRP - V3, BELIZE - Bob, W0YBS, will be active as V31CO from Cay Caulker between October 24th and November 13th. L'esemplare di SSR-1 visibile in foto è un ricevitore di medie prestazioni adatto per SWL : copertura continua tra 0,5 e 30 MHz ,doppia conversione con sistema "Wadley Loop",selettività che si commuta automaticamente : 5,5 KHz in AM e 3 KHz in SSB/CW , sensibilità dichiarata di 1 Microvolt in AM e di 0,3 Microvolt in SSB/CW. W7IUV Preamp : Measurements of K9AY control box filter/preamp: Variable Gain Preamp for 160m-80m (Ham Radio Oct 1989) { This is the same preamp found in the 'Front End Saver' series of products. Préamplicateur W7IUV. 5 m (100 ft. start_server() function; and the protocol benchmark uses loop. Man and woman talking over music at 1159. IV3PRK Pierluigi "Luis" Mansutti (ex HC1PF). SoftRock connected to normal antenna system, a NE facing K9AY with W7IUV pre-amp. DX LISTENING DIGEST 15-52, December 30, 2015 Incorporating REVIEW OF INTERNATIONAL BROADCASTING edited by Glenn Hauser, http://www. I used a 4" plastic electrical junction box at the bottom. Dynamic Range tests of WSJT X and WSPR on 630m using AGC with IC-7300. You can use it as high IP preamplifier, buffer amplifier or small driver. Receive Loop with W7IUV Preamp - W1AEX. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. Položky nejsou dál řazeny např. Just for record i have included a list of OSCAR-13 operators with their call letters and antennas used for downlink Mode-S from 2400. The YCCC preamplifier is the key component for the low band receiving array described in W1FV’s article, “A Compact Dual-Band, 9 Circle Receiving Array” that appeared in two parts in the September/October 2011 and November/December 2011 issues of NCJ. Back in the "old days", you had to get a different call sign when you moved to a new call area. High-IP3 Push-Pull LNA with 2N5109. Finalmente dopo aver recuperato tutti i componenti necessari oggi ho terminato l'assemblaggio del preamplificatore di W7IUV per 160 metri (consiglio di costruire l'ultima versione pubblicata sul suo sito) da abbinare al loop in cavo coassiale oggetto della discussione. 1 - IV3PRK 160 m. Transformation High-Z Low-Z 500 Ω to 75 Ω 2 passes (1 turn) 5 passes 500 Ω to 50 Ω 2 passes (1 turn) 6 passes 950 Ω to 75 Ω 2 passes (1 turn) 7 passes Diagram from www. Posted by Peter Voelpel, Jun 24, 2005 1:14 AM. Easily built active antennas are also popular and once situated in a quiet spot in your backyard, can work extremely well, considering their size and simplicity. Article de Mégahertz juin 2000. it W7iuv Preamp Kit. 8 kHz het against 774. create_server() with a simple echo protocol. In my environment, one W7IUV preamp that has a measured gain of approximately 21 dB appears to be just adequate (I normally use a W1FB preamp with gain adjusted to approximately 46 dB). Un aiuto in piu' per la ricezione. Ve snaze odstranit průlezy a intermodulace vzniklé v třítranzistorovém zesilovači jsem našel také následující zapojení jednoduchého anténního předzesilovače podle W7IUV: První pokusy ukázaly, že zesilovač skutečně pracuje celkem dobře. Loop Antenna Push-Pull FET LNA. Note, this isn’t a build I suggest for a newbie since the antenna itself is fairly complex by itself but if you’re willing or able to learn it’s a good match imo. Ewe Antenna at KC4HW It has been reported that the best way to tune an array for best F/B is to find a medium-wave BC transmitter in the back of the antenna. Ham Radio - W7IUV pre amp on my junk box magnetic loop for receiving. Buy the best and latest w7iuv preamplifier on banggood. 80 mètres antenne de réception antenne magnétique bandes basses boucle magnétique cadre de réception g1rzn kc2tx préamplificateur w7iuv Archives des chroniques hertziennes de XV4Y, ZL4YY XV4Y : Station radioamateur en OK20UA. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. It will take a test to find out. This preamplifier is also be useful for regular commercial shortwave radio reception. Even with my earth-electrode "antenna" in t= he ground Italy, Spain, Norway and many other countries were spotted last n= ight on my "deaf" FT817 on 472kHz WSPR. 144 MHz Hybrid LNA - W6IOJ. Regret I have not the test equipment to do OIP tests. 6 m dish helix fed WA7ABP Lynn 1. 2 m dish helix fed KB7CNN Bill 2 x 45 loop yagi W7IUV Larry 3. W7IUV HF-Antennenverstärker. Remarkable session with high activity and strong propagation for North America as band conditions were ”…good with occasional flashes of greatness”; N1VF QRV from an apartment with loop and ‘flea power’ reported by fifteen including KL7L at almost 3300 km; Very high CW activity, including QSO between K9FD and W7IUV and numerous transcontinental chats; G0LUJ reported JT9 from ZF1EJ. Note: Time and money prevent me from testing all possible transistors in this circuit. On October 17, W7IUV and VK4YB completed a JT9 contact, possibly the first US-to-DX contact between radio amateurs on 630 meters. SOLDERED Preamplifier for Magnetic Hula Loop HF Antenna AD8129. Upload a photo. Flag/Pennant LOOP HF Antenna KIT, 50 Ohm with Preamp. He is interested in suggestions and ideas. The termination was adjusted to null New York City, and it seemed to be working well with 1010 WINS knocked down by +20 dB leaving co-channel WCNL New Hampshire alone on the frequency during the day. Read more about uvloop. Boring, OR 97009 [email protected] The loop is diamond shaped with the top supported by a mast and the bottom connected to a grounding rod. Al Penney VO1NO / VE3. Talks, announcements, references to Rivadavia, 34332 (Carlos Gonçalves, coastal site in Portugal, JRC NRD-545DSP & DRAKE R-E; Advanced Receiver amp. " John's 630m Vertical "Antenna is an 80 foot asymmetric T-top marconi with 100 foot and 200 foot legsradial system is almost 3 miles of radials connected via various busses. I often use bi-directional tuned loops, but the portable flag (see the lead image) is unidirectional and broad band, which is a great advantage. Un ensemble avec sa ligne pour le rendre multibande et peu directif. I elected to start from just the schematic and comprehensive design notes, and also wanted to try to develop some new skills useful in future projects. By Don Kirk (wd8dsb) This website contains basic details on the portable flag antenna I designed for tracking down RFI (radio frequency interference) on MF (medium frequencies) and HF (high frequencies), as well as some tips and tricks on its use and frequently asked questions. 3603——37 3613——35 3623——32 3629. Man and woman talking over music at 1159. As the loop gets smaller, signal pickup of course does get less, but you can compensate for this by carefully applying gain with something like a home-brew w7iuv preamp (which I can fully recommend, using a 2n3866 transistor, which are readily available here in the UK. com in a single category. 10 meter homebrew vertical antenna. W7IUV has tried numerous transformer designs, but he says that the one described in the QST article is the only one that makes his Flag antenna "come to life" and perform as it should, and without hearing compuiter "birdies" (which are apparently picked up by the feedline when using his other experimental transformers). As a final note, after running the two loops for almost 2 years, I built and installed a W7IUV broadband preamp at the feedpoint of the North-South loop. >=3B Date: Fri=2C 1 Apr 2016 04:58:20 +0= 000 >=3B From: [email protected] Free shipping. eines W7IUV Vorverstärkers3 beschrieben. Antenne a Bandier a Pennone: K3KY presenta un compendio di informazioni su queste antenne. Boucle de 42 mètres. Die Loop hat einen Vorverstärker von W7IUV (ein kleiner 7,2 Ah Bleiakku steht direkt daneben). Posted 11/27/12 2:46 AM, 29 messages. Ok, senior moment. In addition use a magnetic loop for receive. I have been unable to rise the -55 dB gain without increasing also the noise level, and thus no improvement in the S/N ratio. By Don Kirk (wd8dsb) This website contains basic details on the portable flag antenna I designed for tracking down RFI (radio frequency interference) on MF (medium frequencies) and HF (high frequencies), as well as some tips and tricks on its use and frequently asked questions. 84 ft Loop. Howdy! I'm Larry, W7IUV, and my wife is Tanya, K9VBS. >=3B Date: Fri=2C 1 Apr 2016 04:58:20 +0= 000 >=3B From: [email protected] Introduction Receiving Basics RX Loops Elongated Terminated Loops EWE Antenna Flag Antenna Pennant Antenna K9AY Loop Beverages. The basic Waller has only a ~13 foot (4m) turning radius. Abstract Some types of receiving antennas like terminated loops are. Article will appear in QST, and it currently is schedule for the March 2021 issue. The W7IUV link is down also. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. 5 ft X 5 ft Mini Receiving Loop. Pips on the hour followed by ID by man and more talk. EUR 4,10 + spedizione. com) was given a gain test as well: it has lower gain (11 dB typical). Here is the loop mounted on a TV rotator 3 ft above the ground. W7IUV vi mostra come fare questa antenna girevole x ricezione. Sunday / 20 December, 2015 Information bulletin of Russian DX League. ) Schaltung Die Schaltung wurde von W7IUV beschrieben und mehrfach adaptiert. Los servicios brindados a sus asociados, así como los eventos y activacio-nes que se organizan sólo. That's right, I said "Rotary" Beverage. ) and the other two sides about 24. ) di cui in foto è visibile solo la metà superiore e per i 160 la sintonia è ottenuta molto spartanamente con capacità serie/parallelo, mentre per la 80m ho utilizzato un compensatore ma non ho comunque raggiunto un ros 1:1. These tend to be very small and not need much height to work properly. 5dB , but may be better with the low output impedance of the loop. Article de Mégahertz juin 2000. Band conditions no great shakes considering the state of Sunspot Cycle. There is a biography available on QRZ. OK2ZI vend des circuits imprimés pour le préampli W7IUV (Ebay). Abecedně řazený seznam literatury, programů a pomůcek, který nabízíme ke stažení. Several years ago I noticed something similar. 3543-3593-42-40. Rob Sherwood, NC0B. But still, quite an improvement for RX on t. Search for: Homebrew double zepp antenna. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. Due to it’s capabilities, it is an extremely popular device and clones are available from your preferred chinese trading platform for less than 5 Euro. The performance increase was nothing short of amazing. There is a biography available on QRZ. Gain is up to 18dB and there is also build in variable ATT. Уважаемые посетители! Информация, размещенная на нашем сайте, освещает работу Украинского QRP клуба - UR-QRP Club. Another loop antenna - The RadioBoard Forums. Utilizzare un'antenna verticale in un ambiente urbano, sicuramente rende difficile la ricezione dei segnali DX (e non) specialmente nelle bande basse HF. The preamp is at the base of the antenna and is bypassed by a relay when the bias T is switched off. 2kHz when the weather is more tolerable and mod the input match to the orig= inal m0bmu amp/filter. InitialNo: Year: Callsign: Locator: TX: RX: Remarks: 780: 2021: KB7Q: DM23VS-04: R-03: 2. SoftRock connected to normal antenna system, a NE facing K9AY with W7IUV pre-amp. Broadband Active Loop for Car Roof Use. Da le soproga ne izve, HI! 6. proximity to the mast and the coax loop, which stuck out horizontally at such high elevations. Our kit contains the following items: a 365 MMF Air Variable Capacitor, 10 feet of flexible coaxial cable, 12 feet of 14 Ga antenna wire for the main loop, 33 inches of 14 Ga antenna wire for the pickup loop, a phenolic knob, a pair of 4 foot long wooden supports, a metallic 1/8 inch phono plug, various fasteners and the assembly instructions. Regret I have not the test equipment to do OIP tests. Frequency measurement today, 05/15/05 is 889. This preamp-per-loop, PPL config, will require a hybrid combiner/mixer between the preamps and the feeder coax. " John's 630m Vertical "Antenna is an 80 foot asymmetric T-top marconi with 100 foot and 200 foot legsradial system is almost 3 miles of radials connected via various busses. 5 wavelength), a Receive Loop is much smaller (most are less than 0. A great way to pass a cold winter afternoon is to homebrew some preamps. 26 ground rods. Talks, announcements, references to Rivadavia, 34332 (Carlos Gonçalves, coastal site in Portugal, JRC NRD-545DSP & DRAKE R-E; Advanced Receiver amp. My piece was 10' long, which gave an ending diameter of 40" (~1 Meter). Loops can be divided into two general classes,. com/profile. Larry is also WH2XGP Part 5. 73 und gl, Roman – DL3TU. Hmmm! Po teoriji dela CQ antena zaradi svoje trodimenzionalnosti tudi na majhnih višinah, iz luknje (če že ne iz vodnjaka, HI), ni občutljiva na okoliške predmete, ima zelo nizek kot sevanja, opisujejo jo kot pravo DX anteno - kot ustvarjena zame. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. 2 m dish helix fed K8YAH Ron 2 x 45 loop yagi WJ9F Russ 2 x 45 loop yagi. it W7iuv Preamp Kit. I’ve been thinking of building a couple as a general interest project and today turned out to be THE day to rock and roll. W7iuv Loop W7iuv Loop nokia rrh He was, he says, "taken aback. Article will appear in QST, and it currently is schedule for the March 2021 issue. ; raised, 4 loop K9AY, 30 m 180º/0º mini-Bev. First time entry and had nice relaxing few hours. My search for a low band preamp started many years ago. The loop is diamond shaped with the top supported by a mast and the bottom connected to a grounding rod. org >=3B Subject: Re: AW: VLF: 8270: now 8269. The only comment I have about that antenna is that it seems really ground independent for those with really poor grounds and it is rotate able with great front to back for notching interference. -----080004050105000508010406-- From [email protected] Talks, announcements, references to Rivadavia, 34332 (Carlos Gonçalves, coastal site in Portugal, JRC NRD-545DSP & DRAKE R-E; Advanced Receiver amp. ) off the ground. Un aiuto in piu' per la ricezione. That's right, I said "Rotary" Beverage. Cairo, Abu Zabaal. Ve snaze odstranit průlezy a intermodulace vzniklé v třítranzistorovém zesilovači jsem našel také následující zapojení jednoduchého anténního předzesilovače podle W7IUV: První pokusy ukázaly, že zesilovač skutečně pracuje celkem dobře. Kevin Loughin. There is data contained within that is necessary to obtain maximum performance from this circuit. 0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,HTML. The main category is Preamp projects and notes that is about About preamps for ham radio use. I no longer have the KAZ loop, but I'm going to build another one. The 85 foot receive loop works very well from the bottom of the broadcast band through 40 meters. callsign lookup. com/watch?v=_0XPrCxgs94. 3: Loop Antennas for HF Reception Contributed by: B. 1/27/2012 (Jim Evans, Germantown, TN, RX-340, IC-R75, ALA100M Loop, Random Wire (90'), Cumbre DX via DXLD) ** EGYPT. There is a biography available on QRZ. The basic Waller has only a ~13 foot (4m) turning radius. No Interference Reported. Disegni e foto, oltre a una schematica del pre-amp. W7IUV, with the extra points corning from a greater number of DX QSOs. Some people who have not actually compared the signal output of a flag antenna to other small antennas have. There is data contained within that is necessary to obtain maximum performance from this circuit. Lawrence Molitor. 0 m dish helix fed KE7NR Don 2 x 45 loop yagi N7RYW Bill 2. Уважаемые посетители! Информация, размещенная на нашем сайте, освещает работу Украинского QRP клуб. Don Kirk, WD8DSB I spend a lot of time tracking down RFI (radio fre quen-cy interference) in the MF (medium-frequency) and HF (high-frequency) bands. Larry W7IUV THANK YOU!! 5/24/2013 Antenna Modeling - Getting Started 15. 5 foot square shielded loop which is located in my shack, and the MC1350 IC gets permanently altered when I transmit on 160 meters using my 53 foot base loaded vertical. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow. You can use it as high IP preamplifier, buffer amplifier or small driver. html Return to Home Page. Gamma Match 21 Mhz. Nearly all the newly re-invented compact receive antennas derive from the terminated loop, the earliest reference was in an appallingly mimeographed prewar training manual of W3EEE Dad‘s 1973 COMMUNICATIONS 74 CONFERENCE BRIGHTON Wednesday, June 5 1974 — Session 5 Equipment Design Paper 5. W7IUV Preamp : Measurements of K9AY control box filter/preamp: Variable Gain Preamp for 160m-80m (Ham Radio Oct 1989) { This is the same preamp found in the 'Front End Saver' series of products. Article de Mégahertz juin 2000. Whether you are a professional or hobbyist, a preamp kit is a great way to add custom features and specifications to your home stereo or musical instrument systems. with news, information and resources. The termination was adjusted to null New York City, and it seemed to be working well with 1010 WINS knocked down by +20 dB leaving co-channel WCNL New Hampshire alone on the frequency during the day. I forgot to factor out the insertion loss. Along with me this year was Henrik KK6BQU (operating low-power nearby), and Gary KE6QR and Dave N6ORB were already set up in the same parking lot. The 85 foot receive loop works very well from the bottom of the broadcast band through 40 meters. The W7IUV amplifier was modified by changing C1, C2 and C4 from 47nF to 1 uF and replacing T1, which used a FT37-43 core, with a FT50-75 core. Both designs worked right off; fortunately no wiring mistakes. HF High-IP3 Push-Pull LNA - WN5Y. – TX/RX leaking – Polarization filter HWF – Twisted pair lines – HWF single loaded loop construction – HWF dual loaded loop construction – Multiples loaded loops RX arrays. W7IUV amplifier: Gain was in the 19 to 21 dB range between 0. W7IUV Beverage preamplifier PCB. Remarkable session with high activity and strong propagation for North America as band conditions were ”…good with occasional flashes of greatness”; N1VF QRV from an apartment with loop and ‘flea power’ reported by fifteen including KL7L at almost 3300 km; Very high CW activity, including QSO between K9FD and W7IUV and numerous transcontinental chats; G0LUJ reported JT9 from ZF1EJ. The Waller loop is said to be the equivalent of a rotary Beverage antenna. This is very simply preamplifier module with 2N5109 transistor based on W7IUV design. KD9SV Products SV-KR Keying Relays are actually high-speed Solid State interface units that allow all amplifiers, even older amplifiers with high voltage keying circuits, to be safely connected to and keyed by newer transceivers. The noise factor using a calibrated noise source at 50 ohms input to the amplifier measures 7. Theory of Operation • Despite the shape, actually a pair of verticals • Feedline on top and bottom gives crossfire phasing towards feedpoint when elements closer than ¼ Lambda • Terminating resistor is equal to feedpoint impedance, and. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. Ewe antennas at 218 and 293 degrees, temporary 4 1/2 ft. uk/~equinox/. W1QA and I put a lot of work into getting the station. The second recent project was a preamplifier for a double half delta loop DHDL receiving antenna based on a design by W7IUV. Low-Band Receive Antennas. 1 45444 CG (Carlos Gonçalves, Rx & site: JRC NRD- 545DSP & PERSEUS sdr; Quantum Phaser, homemade amp. NC1I: Frank [email protected] Along with me this year was Henrik KK6BQU (operating low-power nearby), and Gary KE6QR and Dave N6ORB were already set up in the same parking lot. DX LISTENING DIGEST 15-52, December 30, 2015 Incorporating REVIEW OF INTERNATIONAL BROADCASTING edited by Glenn Hauser, http://www. Several years ago I noticed something similar. This preamplifier is also be useful for regular commercial shortwave radio reception. 60 mA on 2N3866 / KFY34 - special heatsink for to cool the transistor. Low Band High Performance Preamp Larry - W7IUV Revision 5 copyright 19982009 Note: Please 1 Flags at IV3PRK: from West Coast to Florida models Upgrading from the rotatable Flag by W7IUV, and the original K6SE design, to the "Waller Flag", an end-fire rotatable two loops array by NX4D and N4IS. Some people who have not actually compared the signal output of a flag antenna to other small antennas have. 3603——37 3613——35 3623——32 3629. Attention, valeurs et marquages des composants ne correspondent pas à la dernière version du préampli (revision 6 - 2009 2013). ; raised, 4 loop K9AY, 30 m 180º/0º mini-Bev. Panorama radiofonico internazionale n. 8 kHz het against 774. L'autre solution aurait été de couper son alimentation et de mettre l'entrée antenne en court-circuit lors des périodes d'émission, mais elle amène beaucoup de complications toujours sources de problèmes. Another loop antenna - The RadioBoard Forums. Back in the "old days", you had to get a different call sign when you moved to a new call area. (W7IUV version); raised, 4 loop K9AY, 6x19x6 m Ewe 135º, 14 m low noise LF/MF Vertical. 3 and 17 MHz. About W7IUV 160 Meters vertical The resource is currently listed in dxzone. With the current Tx and Rx antenna setup I am currently collecting more than 1000 WSPR spots per night on other stations. Article will appear in QST, and it currently is schedule for the March 2021 issue. Da le soproga ne izve, HI! 6. Il a intégré la commutation du préampli par relais ainsi qu'un atténuateur (sur les modèles plus récents). I meriti del transmatch. 9917 kHz; and KLFF is on 889. com in 2 categories. 137514 -18 0 BP51ip 2 W7IUV DN07dg 2455 117 (16) 2017-01-29 09:32 WH2XND 0. Special thanks to W7IUV for making these plans available to the Amateur Radio Community. a Broadband Active Loop Antenna, looking at the. Free R Service Holland - pir. Unlike a large loop antenna (greater than 0. Avec balun à air 4/1. 2 m dish helix fed KB7CNN Bill 2 x 45 loop yagi W7IUV Larry 3. The Recteangular Loop or Flag Antenna, Chapter 7-87, 『ON4UN's Low Band DXing - 4th Edition』,2005, ARRL. The YCCC preamplifier is the key component for the low band receiving array described in W1FV’s article, “A Compact Dual-Band, 9 Circle Receiving Array” that appeared in two parts in the September/October 2011 and November/December 2011 issues of NCJ. Posted 11/27/12 2:46 AM, 29 messages. Nearly all the newly re-invented compact receive antennas derive from the terminated loop, the earliest reference was in an appallingly mimeographed prewar training manual of W3EEE Dad‘s 1973 COMMUNICATIONS 74 CONFERENCE BRIGHTON Wednesday, June 5 1974 —Session 5 Equipment Design Paper 5. Larry W7IUV THANK YOU!! 5/24/2013 Antenna Modeling - Getting Started 15. W7IUV 160 Meters vertical 90 foot tall top loaded vertical for 160 meters 6 Meter 5/8 Wave Vertical Antenna The G3JVL 6 Meter ground plane vertical is a compact antenna that is ideal for portable operations. Gain is up to 18dB and there is also build in variable ATT. poi a pag 7-89 di Low Band DX'ing la tua antenna è descritta sotto il nome di diamond-shaped loop, che non necessariamente deve essere equilatero, puoi anche allungarlo da una parte o dall' altra a seconda dei materiali che hai a disposizione e ON4UN consiglia di tenerla a un paio di metri da terra per un migliore rendimento. Howdy! I'm Larry, W7IUV, and my wife is Tanya, K9VBS. SoftRock connected to normal antenna system, a NE facing K9AY with W7IUV pre-amp. Then I modified my original rotatable W7IUV Flag into a double loop WF, but the results were not as expected. net via DXLD) ** U S A. net The "Flag" and "Pennant" antennas optimized and publicized by K6SE on the topband reflector show great promise for those of us who live on less than full section farms. 8MHz) DX Operation: W7IUV preamplifier. p Torino AD. W7IUV amplifier: Gain was in the 19 to 21 dB range between 0. InitialNo: Year: Callsign: Locator: TX: RX: Remarks: 780: 2021: KB7Q: DM23VS-04: R-03: 2. Ewe antennas at 218 and 293 degrees, temporary 4 1/2 ft. Via, non è niente di eccezionale, la perlina di ferrite serve solo a prevenire auto oscillazioni ma non e' critica. I think the main difference in performance is the 3/8" coax by 1 meter loop, verses the 1" copper by 1. W7IUV preamp part 1. Measuring the gain and response with a VNA, the amplifier has almost 24dB of gain at LF, up to 20MHz, dropping off to 14dB at 28MHz. =20 My limitation are a noisy over head power line some 200m away which I cant m= itigate with the present tools. Read more about uvloop. EUR 4,10 + spedizione. Смотрите далее. Posted 11/27/12 2:46 AM, 29 messages. —-SNR(dB) 3534. Navigation W7iuv Loop - eyeb. Originally the preamp gain pot causes. Portable Flag (Terminated Loop) Antenna For MF/HF Radio Direction Finding. 10 meter homebrew vertical antenna. It includes a 6db output attenuator that also provides a 50 ohm output. Specifically I would look into the w7iuv preamp which is pretty simple to build and all the components are easily bought from Mouser from what I’ve seen. Broadband Active Loop for Car Roof Use. About W7IUV 160 Meters vertical The resource is currently listed in dxzone. http://dxworld. Transformation High-Z Low-Z 500 Ω to 75 Ω 2 passes (1 turn) 5 passes 500 Ω to 50 Ω 2 passes (1 turn) 6 passes 950 Ω to 75 Ω 2 passes (1 turn) 7 passes Diagram from www. We think a single Op Amp with two 180 degree inputs, and the hybrid combiner can be made in one small unit. E, pops, tks. =20 Anyone ID the carrier/mod on 29. Loops can be divided into two general classes,. Also have 3 W7IUV amplifiers with 2SC5551 transistors. 0 m dish helix fed KE7NR Don 2 x 45 loop yagi N7RYW Bill 2. La pagina originale è scomparso, ma i ragazzi di www. html Return to Home Page. First time entry and had nice relaxing few hours. Low-Band High-IP3 LNA - W7IUV. The most distant station out of the 39 unique callsigns that I have received in the past 2 weeks was W7IUV in DN07dg at a distance of 3549 km. QRP - V3, BELIZE - Bob, W0YBS, will be active as V31CO from Cay Caulker between October 24th and November 13th.