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20m Ontvangers Recepteur a Reaction 20m de F5LVG Une détectrice à réaction est un récepteur simple relativement sensible du fait de la réaction. Ce procédé consiste à réinjecter à l'entrée d'un amplificateur une partie du signal de sortie qui est alors réamplifiée, .. http://oernst.f5lvg.free.fr/rx/14mhz/rx1v1_14mhz.htm   20m Zendontvangers 14MHz SSB 10mW Transceiver by JF1OZL I wanted to QRV on 14MHz SSB mode. I have known that 14MHz can be used for domestic communication. They made Japanese domestic QSO about 14.18MHz http://www.intio.or.jp/jf10zl/14mssb10w.htm A CW QRP Tranceiver for 20m band by IK3OIL The little QRP presented in this article may be built in a gradual manner, in fact it is divided in two main modules (plus VFO), you may also complete only a single part (RX or TX module). http://www.ik3oil.it/_private/rtx_eng.pdf A QRP SSB/CW Tranceiver for 14MHz by W7ZOI Part 1: Exotic circuitry and hard-to-find components aren't necessary if you want to build excellent performance into a home-brew SSB/CW transceiver: Careful design is the key. http://www.arrl.org/tis/info/pdf/8912018.pdf A QRP SSB/CW Tranceiver for 14MHz by W7ZOI Part 2: This moth, W7ZOI rounds out his description of a 1- or 10-W SSB/CW rig with details on its transmitter, TR switching and optional speech processor. http://www.arrl.org/tis/info/pdf/9001028.pdf BITX - An easy to build 6 watts SSB transceiver for 14MHz by Ashhar Farhan BITX is an easily assembled transceiver for the beginner with very clean performance. Using ordinary electronic components and improvising where specific components like toroids are not available, .. http://www.phonestack.com/farhan/bitx.html Glowbug Tranceiver by GØUPL This tranceiver is under construction at G0UPL. It will use only valves, no solid state devices. It will use a superheterodyne architecture to cover 80m and 20m bands with a 5.0 - 5.5 MHz VFO and 9MHz IF. http://www.hanssummers.com/radio/glowbug/index.htm HF Transceiver using NE612 by VU2UPX The inspiration for the project came after attending the HamRadio 2000, Millenium Ham Meet @ Hyderabad (December 22, 23 & 24) where I met Grand Masters like VU2NR and VU2RM, OM Raju and OM Rao respectively. http://www.qsl.net/vu2upx/Projects/transreceiver.htm HF TRX with PTO based VFO by VK2ZAY While surfing around the 'net I came across WA6OTP's website. Now I've seen PTO based VFOs before, but his implementation is very simple and elegant. I just couldn't resist the urge to build one myself and try it out. http://www.vk2zay.net/article.php/45 Homebrew 20m CW Transceiver by 7N3WVM Homebrew 20m CW Transceiver. http://www.qsl.net/7n3wvm/xcvr-20m.html   MultiPig 20 Transceiver by W8PIG The multiPIG is an Electronic Instrument that functions as an all band QRP Transceiver, a Signal Generator and a Frequency Counter. http://www.fpqrp.com/pigg20/ The Multi-Pig Phased-Lock Loop Frequency Synthesizer by AA3SJ The PLL is part of a larger project, the MP20 (multi-PIG) designed by Dieter Gentzow, W8DIZ. Details and construction lessons can be found at the MultiPIG web page. http://www.qsl.net/aa3sj/Pages/MP20-PLL.html My First QRP Rig "The Barefooter" by PA2OHH When I found the design, I did not believe that it was possible to make QSO's with it as its simplicity is such a contrast with the standard amateur transceiver with high power, superhet receiver and other complex circuits. http://home.hetnet.nl/~pa2ohh/bafoot.htm My Homemade 20m HF SSB Transceiver by OZ2CPU Output power is now only 4mW, from the Re-used input RF amp that also works as a filter, to only amplify the wanted difference from the mixer, not the sum. http://www.webx.dk/oz2cpu/20m.htm Pocket sized 20m (30m) CW QRP transceiver by S56AL I started to discover the 30m band by using an adapted version of my 80m single-board CW transceiver. The first impressions were quite encouraging, so I decided to build a portable transceiver for this interesting band. http://lea.hamradio.si/~s57nan/ham_radio/tinka/tinka.html Radio Ozon - Miniature 20m CW station by GØUPL This project aims to build a complete miniature 20m handheld tranceiver into an Ozon mint tin. These mints are available at many newsagents here in the UK. The target is a complete station in a box, not just a transceiver. http://www.hanssummers.com/radio/ozon/index.htm   20m Zenders QRP Transmitter with VXO by PA2OHH Normally these designs have only two transistors. A good example is My first QRP rig that can be found somewhere else on this site. Here the VXO (Variabele X-tal Oscillator) has a tuning range of 16 kHz. http://home.hetnet.nl/~pa2ohh/98tx20m.htm SSB Transmitter by SMØVPO This project is relatively simple to construct, and will give a "presentable" SSB signal on the lower HF amateur bands. http://web.telia.com/~u85920178/tx/ssb-tx1.htm Step VFO by SMØVPO This project has two different inputs, one for 600Hz FSK and one for keying the oscillator. It is based upon a crystal so the HF stability is excellent. http://web.telia.com/~u85920178/tx/hf-osc1.htm The VU-Transmitter for 20m by G3RJV K.P.S.Kang, VU20WF of the recently formed VU QRP Club has designed several club projects based upon very small printed circuit boards. The first of these that I saw and built was a transmitter based on the W6BOY Pixie. http://www.southgatearc.org/qrp/transmitter.htm   20m Versterkers   20m Antenne's 20M - 1 Foot Antenna by WB5CXC I used 1" copper pipe to make my cylinders. They will fit snugly on a 3/4" PVC pipe. The PVC pipe will have to be sanded down to allow the copper pipe to fit. http://www.wb5cxc.com/20_m.htm Homebrew Hexbeam Page by W1GQL In August 2004 I had a QSO with Joe Italiano, N9PH, and Joe told me that he was turning "Martha" my direction. Joe told me that she was a homebrew Hexbeam made with bamboo poles that he had bought at K-Mart. http://midcoast.com/~w1gql/hex/hexbeam.htm Short Antenna by SMØVPO "QRP" operation often means operating in remote places where a decent full-sized antenna is not possible. I personally live in an appartment where I am unable to erect large antennas. http://web.telia.com/~u85920178/antennas/short.htm 'Shorty' Dipole for 14MHz by G3YCC This mini dipole was described in Practical Wireless and Sprat recently in addition to the Five-Watter, the magazine of the Michigan QRP Club. http://www.g3ycc.karoo.net/shorty.htm A Simple Antenna Solution for 20-meter Field Operations by AE6N An antenna I have had success using for QRP field operations is a simple 20 meter quarter wave vertical using number 18 wire. http://www.arsqrp.com/ars/pages/back_issues/2003_text/0303_text/AE6N.html A Small Transmitting Loop Antenna for 14MHz and 21MHz by VK5BR By definition, the small transmitting loop has a circumference less than one quarter of a wavelength. Because of its small size, it is possibly an attractive proposition for someone with inadequate space to erect a larger aerial. http://www4.tpgi.com.au/users/ldbutler/HFTXLoop.htm QRP Beach Vertical 20m Moxon by M3KXZ All my working is HF QRP SSB and I usually rely on my 8 metre fishing poles, trusty homebrew non-resonant 44ft doublet antennas (one at home and one for portable) and also a 10 metre tall homebrew vertical at home. http://www.moxonantennaproject.com/m3kxz/M3KXZ_VERTICAL.htm Two elements YAGI for field day operation by VE3RGW With the success on the invisible attic wire beam, a lot of club members showed their interest on this trial and discussed possibility of similar application. http://www.qsl.net/ve3rgw/field98/beam.html

Update: 18 november 2006

© Maarten PG1N