amplifier 20 m

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Antennas : Satellite
  • Adding to an Arrow Satellite Antenna - By adding a tripod for mounting, bearing indicators, and a pre-amplifier, you can create an impressive antenna system for picking up FM signals from AO-51.
    [ Hits: 4326 | Votes: 1 | Rating: 4.00 ]
Antennas : Windom
  • OH7SV Matti Hohtola Ham Projects  updated - The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO, 50 ohm to 200 ohm HF wide band transformers, Wilkinson splitter for RX measurements, Windom baluns 2001/2004, Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
    [ Hits: 19201 | Votes: 27 | Rating: 8.04 ]
Radio Equipment : HF Amplifiers : Heathkit SB-200 Radio Equipment : HF Amplifiers : Heathkit SB-220
  • SB-220 SB-221 Heathkit Amplifiers - SB-220 or SB-221 Heathkit Amp Using Eimac's 3-500Z - K0GKD
    [ Hits: 4673 | Votes: 7 | Rating: 7.57 ]
  • Improving Heathkit SB-220 - Circuit Improvements for the Heath SB-220 Amplifier
    [ Hits: 2356 | Votes: 6 | Rating: 9.83 ]
  • Heathkit SB-220 - The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975. Resources and modifications
    [ Hits: 3438 | Votes: 1 | Rating: 1.00 ]
  • 2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM
    [ Hits: 6803 | Votes: 4 | Rating: 4.75 ]
Radio Equipment : HF Amplifiers : Kenwood TL-922
  • QSK for the TL-922 and SB-220 mods - Beautifully constructed amplifiers. Unfortunately, are not suited for high speed T-R switching, a necessary attribute for operating AMTOR, QSK-CW, or SSB-VOX modes.
    [ Hits: 2498 | Votes: 6 | Rating: 8.33 ]
Radio Equipment : HF Transceivers : Yaesu FT-1000MP
  • Qsk keying for yaesu radios - QSK amplifier keying circuit for Yaesu FT-1000MP, FT-1000MP Mk-V, FT-1000/1000D and FT-920
    [ Hits: 583 | Votes: 0 | Rating: 0.00 ]
Shopping and Services : Radio Equipment Repair
  • N4ATS.com - N4ATS - Devoted to the Yaesu FL-7000 Amplifier. I have been rebuilding, repairing, and applying modifications to the Yaesu FL-7000 amplifier for 15 years. Over 200 units completed and counting!
    [ Hits: 1961 | Votes: 3 | Rating: 9.33 ]
Technical Reference : Amplifiers
  • The DX 200 amplifier - Interesting homebrew project by G4BXM, Roger
    [ Hits: 1895 | Votes: 0 | Rating: 0.00 ]
  • SB220 SB221 arcing problems improvements mods - This article explores the claim an amplifier might arc from a parasitic oscillation, damaging capacitors, bandswitches, or other components.
    [ Hits: 1167 | Votes: 2 | Rating: 10.00 ]
  • Modifications to the Ameritron AL-1200 Amplifier - This page describes two modifications W8WWV made to his AL-1200 amplifier. The mods were obtained from Ameritron, so they are official.
    [ Hits: 2709 | Votes: 4 | Rating: 2.75 ]
  • A low cost 600 watt ultra-linear amplifier  pop - This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. It is only 11" wide, 4" high, and 9" deep. Operates for 40, 20, 17, 15, 12, and 10m
    [ Hits: 28293 | Votes: 21 | Rating: 6.39 ]
Technical Reference : Amplifiers : HF Amplifiers
  • 1.5 to 30 Mhz RF Amplifier  pop - This high range amplifier is very small [SB200 size] Vacuum variable input and output caps as well input and output switching.
    [ Hits: 50874 | Votes: 38 | Rating: 3.47 ]
  • JA3MHV Amplifiers - 4CX1000A x2 AB1GG Power Amplifier, 21MHz 15W and 3.5/7MHz 20W SSB Transceiver by JA3MHV, 50/144/435MHz 80W Linear Amplifier
    [ Hits: 2537 | Votes: 2 | Rating: 10.00 ]
  • A 20m monoband Power Amp - The 20m monoband 4-1000 amplifier, by Jelmer (pa5r), Herman (pa0ten) and Frans (pa5ca)
    [ Hits: 2584 | Votes: 2 | Rating: 9.50 ]
  • Homebrew HF Amp with 3CX3000F7 - Grounded grid triode HF linear amplifier with pictures and schematics diagrams by W2DTC. The amp design was for 160 80 40 and 20 meters
    [ Hits: 2915 | Votes: 8 | Rating: 5.87 ]
  • Ameritron AL-1200 to gs35b Conversion - The Ameritron AL-1200 Amplifier is in current production. In its factory configuration it uses a single 3CX1200A7 (triode) tube, grounded grid configuration. Re-tubing the AL-1200 with a GS-35b with success.
    [ Hits: 2338 | Votes: 2 | Rating: 4.00 ]
  • Hillar's Amp BTI LK-2000 Amplifier to gs35b - The BTI LK-2000 was originally a 3-1000z based amplifier, converted to a GS-35b.
    [ Hits: 1793 | Votes: 3 | Rating: 5.33 ]
Technical Reference : Amplifiers : RF Amplifiers Theory
  • Power Gride Tubes - Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.
    [ Hits: 809 | Votes: 2 | Rating: 6.50 ]
Technical Reference : Amplifiers : UHF Amplifiers
  • 13cm RF Amplifier - This amplifier uses two 60w Spectrian amplifier boards with the usual input and output hybrid coupler and combiner.
    [ Hits: 207 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • A 20W Amplifier for 2 meters - VU2RAR basic VHF power amplifier suitable for 144-146 Mhz output power can vary from 3 to 25 Watts.
    [ Hits: 2496 | Votes: 5 | Rating: 6.60 ]
Technical Reference : Preamplifiers
  • 144 MHz preamplifier with BF981 - Design of a preamplifier for 144 MHz with 1 dB NF and 23 dB gain using BF981. This amplifier is using a low cost silicon MOSFET (BF981 from Philips) to give more than 20 dB gain with around 1 dB noise figure on 2 meter.
    [ Hits: 16343 | Votes: 26 | Rating: 5.92 ]
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