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Antennas
  • The Ultimate Guide to 11 Meter CB Antennas - This site is dedicated to bringing true information about the different types of antennas you can use, buy and build for Citizen Band Radio and 11 Meter DXing.
    [ Hits: 21983 | Votes: 63 | Rating: 7.09 ]
Antennas : 10M
  • Cubic Quad  pop - The cubic quad is a very popular way to get reasonably high gain and excellent front to back ratios as well as low angles of radiation for without going to extreme heights. Includes design for 2 6 10 12 15 meter bands
    [ Hits: 63543 | Votes: 48 | Rating: 4.61 ]
Antennas : 17M
  • W3FF Portable Dipole - This is the antenna w3ff designed for his walking portable station. It is a dipole constructed out of the plastic plumbing pipe CPVC. There are telescoping whips at the ends of each side of the dipole, and these whips are adjusted to bring the antenna into resonance on each of five HF Bands 10, 12, 15, 17, and 20 Meters
    [ Hits: 19340 | Votes: 12 | Rating: 7.82 ]
Antennas : 20M
  • W5GI Mystery Antenna  pop - W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. It is approximately 100 feet long, can handle the legal limit, and is easy and inexpensive to build. It is similar to a G5RV but a much better performer especially on 20 meters.
    [ Hits: 113924 | Votes: 85 | Rating: 6.40 ]
Antennas : 2M
  • QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB. Elements
    [ Hits: 5974 | Votes: 4 | Rating: 5.25 ]
  • QM7 7 elements 144 MHz Yagi-Uda Antenna - The QM7 antenna is a simple 7 elements Yagi with 3.70 m boom length for the lower 144 MHz SSB/MGM band, used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 11.35 dBd; i.e. 13.5 dB forward gain over the isotropic radiator, while the F/R is about 12.5 dB
    [ Hits: 5014 | Votes: 13 | Rating: 5.69 ]
Antennas : 70cm
  • Bazooka dipole for 70 cm band  updated - Here is a very simple 70cms dipole from Harald PD2HFE, which uses a single piece of RG-213 coaxial cable 34 cms in length.
    [ Hits: 13077 | Votes: 14 | Rating: 5.72 ]
Antennas : Loop
  • The K6STI Receiving Loop - This relatively unknown antenna does an amazing job pulling weak low band signals out of man-made noise backgrounds
    [ Hits: 2524 | Votes: 6 | Rating: 6.33 ]
  • The full-wave loop antenna - These omnidirectional antennas offer Horizontal polarization, and about 2.1 dbd of gain. They are much quieter than a dipole or a vertical, have a broader bandwidth and will usually out perform a dipole antenna.
    [ Hits: 4703 | Votes: 4 | Rating: 6.50 ]
Antennas : Portable
  • Antenna system in a shopping trolley wally - Multiband portable antenna system edited by Andy Foad G0FTD, consisting of an old cb antenna with it's 27Mhz matching coil, an antenna tuner, car battery and a transceiver
    [ Hits: 1710 | Votes: 2 | Rating: 10.00 ]
Antennas : Quad
  • Assembly of the Lightningbolt Quad - One of the best antenna values on the market is the LightningBolt Quad. At about half the cost of a tri-band yagi, you get five band coverage with a single coax feedline and excellent performance from a light, low wind load antenna.
    [ Hits: 3261 | Votes: 10 | Rating: 6.80 ]
CB Radio : References Ham Radio : Personal Pages
  • 4S7OF Ham Radio Pages - Information about 4S7OF operations and ham radio in Sri Lanka
    [ Hits: 415 | Votes: 3 | Rating: 6.00 ]
Operating Aids : Beginner's Guides
  • About digital modes - The digital modes provide a wonderful opportunity for those of us who would like to work on the HF bands but find CW too difficult and SSB phone prohibitive because of interference problems. The digital modes are easy to set up and get operating, require low power and a narrow band.
    [ Hits: 6790 | Votes: 6 | Rating: 8.00 ]
Operating Modes : Amateur Television
  • FM ATV repeater PI6ATS - Amateur television Repeater PI6ATS in the middle of the Netherlands. Output in 23 cm band, inputs in 13 cm and 6 cm band. All home made.
    [ Hits: 945 | Votes: 4 | Rating: 7.75 ]
Operating Modes : DSP
  • Clover 2000 - CLOVER-2000 is a faster version of CLOVER (about four times faster) that uses eight tone pulses, each of which is 250 Hz wide, spaced at 250-Hz centers, contained within a 2 kHz bandwidth between 500 and 2,500 Hz
    [ Hits: 717 | Votes: 1 | Rating: 1.00 ]
Operating Modes : Stealth Amateur Radio
  • HF Antennas for restricted space - Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
    [ Hits: 6972 | Votes: 6 | Rating: 4.83 ]
Radio Equipment : HF Transceivers : Icom IC-706
  • Icom IC-706 mods - Enables out-of-band transmit for 1.6 MHz to 54 MHz, Improved VHF recieve mod, other band expansions
    [ Hits: 3059 | Votes: 3 | Rating: 5.67 ]
  • Icom IC-706 Radio mods db - Info and mods for IC-706, IC-706 Expanded frequency IC706 - spare 0.3A, MARS/CAP Modification for ICOM IC-706, enables out-of-band transmit for 1.6 MHz to 54 MHz, ore sensitive transmit for 2 meter IC-706 60 MHz to 200 MHz band pass filter, Icom IC-706 Extended RX mod, ICOM 706 MKII Extended transmit mod, Special on IC706mkII TX range expansion for IC-706MKIIG, Expand only mod for the IC-706MkII
    [ Hits: 18049 | Votes: 11 | Rating: 5.55 ]
Software : DSP
  • WD6CNF DSP Filter - Audio Digital Filter, two bandpass filters, three notch filters, two noise filters graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal, Microphone input, speaker output Mono, 5 kHz bandwidth
    [ Hits: 4447 | Votes: 2 | Rating: 10.00 ]
Technical Reference : Amplifiers : HF Amplifiers
  • 11 KW Linear amplifier by I0JX - Use 4CX10000D / 8171, RF output power of 11 KW in key-down carrier on all bands. Power was measured with a Bird 4712 wattmeter and a 25 KW slug
    [ Hits: 21988 | Votes: 24 | Rating: 7.71 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • 2 m. Band VHF PA 5 Watts - A VHF power amplifier made with two cheap RF transistors, 2N3924 as driver and a BFS22A for final stage, giving an unexpected output power of 7-8 watts maximum
    [ Hits: 1417 | Votes: 1 | Rating: 10.00 ]
Technical Reference : HF Radios Technical Reference : QRP Projects : QRP CW Transceiver
  • A CW TX for 80 meters band - This simple circuit will give about 1.2 Watts of output when powered from a 13.8VDC supply.
    [ Hits: 1585 | Votes: 1 | Rating: 10.00 ]
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