VHF Power Amplifiers for Amateur Radio
Find schematics, construction projects, and commercial options for VHF amplifiers used in amateur radio operations.
VHF amplifiers are essential for many ham radio operators looking to boost their signal on the 6-meter, 2-meter, and 70-centimeter bands. Whether for long-distance DX, EME (Earth-Moon-Earth) contacts, or contesting, a well-built amplifier can significantly improve station performance. These amplifiers typically use vacuum tubes like the 8877 or GS35B for high power, or solid-state devices for lower to medium power output.
This category provides resources for hams interested in building or modifying VHF power amplifiers. Operators can find circuit diagrams and construction notes for projects ranging from low-power 5-watt designs to high-power 1KW amplifiers for 144 MHz. Many articles detail the conversion of existing HF amplifiers for VHF use or offer plans for homebrew 50 MHz amplifiers, helping hams achieve stronger signals for their QSOs and contest efforts.
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G3WZT design for a single stage bi-polar 100-150W Linear Power Amplifier for the 6M band. -
A detailed construction guide for a 1250W 6-meter band (50 MHz) power amplifier utilizing a GU-43B tetrode, including schematics and build photos. -
A detailed construction project for a 144 MHz 1.2 kW amplifier utilizing the Russian GU74b tetrode, achieving 70% efficiency with 20W drive. -
A 2 meter power amplifier -
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 -
A home made VHF 2.5kw RF power amplifier made with a GS35B Triode and designed by Frank F1CXX built in 2003 -
Modification of the MHW 612 by Motorola for the two meter band by sv1bsx -
A 400 W 144 MHz GI7b Linear amplifier -
50 MHz 1500 Watt Russian GS35B amplifier. Well documented. Complete construction details,pictures,schematics, and more. -
G3WZT John Matthews project of a 600 Watt solid state linear amplifier for the 6 meters band -
Class C tuned VHF power amplifier for the 6-meter band by ON6MU -
A 6 meters band amplifier width schematics -
A 50MHz kW Amplifier by Goran Grubishic, 9A6C -
This document details the design and construction of the PA70H, a 50-watt RF amplifier for the 70MHz (4-meter) amateur radio band. Built around the Mitsubishi RD70HVF1 MOSFET transistor, the amplifier delivers 45-55W output with 3-5W input power while operating on 13.8V DC at approximately 7-8A. The PCB design incorporates multiple protection circuits including overcurrent, SWR, and temperature control. The amplifier features various control modes including GND PTT, +13.8V PTT, and RF VOX. Two versions are available: PA70HLI (requiring 100mW input with additional driver) and PA70H (for 3-5W input). The comprehensive documentation includes circuit diagrams, assembly instructions, and performance data showing successful operation from both 100mW and 3.5W input sources. -
G3WZT design for a bi-polar 600W Linear Power Amplifier for the 6M band. -
Home Brew 6 Meter Amplifier with a single 4CX250B by W4NFR -
A 160W linear amplifier for 4 meters band based on GI0GDP -
VU2RAR basic VHF power amplifier suitable for 144-146 Mhz output power can vary from 3 to 25 Watts. -
ACOM 1000 modification uses electric band switching, such that both 6m and 4m operation can be maintained. -
SM5BSZ article on building VHF RF amplifiers -
144 and 432 Mhz GS35b High Power Amplifier -
Pictures and circuit diagramm to build this power amplifier for 2 meters -
A Compact 8877 50MHz amplifier and Power supply -
Home made RF power amplifier for six meter band -
Infomration schematics and pictures about various hf and vhf QRO linear amplifiers -
Two 50 Mhz amplifiers and antenna switch -
Low power VHF RF amplifier with VMP1 Mosfet by IZ1BTS IK1XPD -
LZ2US offers 3 types amplifiers for the serious VHF/UHF amateur. These amplifiers are very robust and in use by contest groups and EME stations all over the world. Every amplifier is custom made. -
A solid state amplifier for HF and 6 meters band by N4IP -
An RF power supply for 144 MHz schematics and instructions -
This shows an unsuccesful attempt to build a push pull 2 m amplifier, with the tubes in grounded screen. -
This homebrew six-meter linear amplifier started off life as a "junker" Alpha 76PA h.f. amplfier. Power output is 800W -
Preamp & Power Amp By Alkberto, I0XGR -
Review by Clive Davies, G4FV -
Improvements to Using the Heath SB-200 Linear on Six Meters by Ron Klimas, WZ1V -
There is not a personal design on this page, just I've transfered useful notes from PHILIPS RF Bipolar Transistors - Data HandBook about BLY89C VHF Power transistor, which is very popular among Amateur Radio homebrewers -
4CX250B X2 K2RIW style 2m amplifier -
2 meter kilowatt linear amplifier -
222 MHz kilowatt linear amplifier -
A home made 50 MHz KW power amplifier project with picture and PCB schematic by W6PQL -
YU1AW project for a home made QRO PA 144 MHz 20 kW GU36B-1 -
A 3CX1500/A7 8877 144mhz W6PO amplifier, that running a little over 4kv on the plate, this Amp will do over 2kw out. -
This project addresses the need for a 50 MHz Amplifier providing substantial power for Australian "Advanced Licensees" permitted to use 400W PEP in the 52-54 MHz band. In regions limited to 100W PEP due to TV channel usage, this initiative aims to enhance power output for transceivers with lower capabilities on the 6m band. -
6-Meter Solid-State 100W Linear Amplifier complete documentation German and English -
A 50 MHz stable and small power amplifier, suitable for portable and domestic use. This RF Power amplifier delivers 900W with used pair of tubes primary installed into amplifier. -
K6ODV Six Meter KW Amplifier Designs -
This PA has been designed by Sergey EX8MLE and uses three Mitsubishi RD100HHF1 FETs, Frequency Range 70 to 72 MHz -
80 watt multi-mode amplifier using one of the newer S-AV36 Toshiba modules. Less than 50 milliwatts will drive it to full output in any mode. -
Article about assembling of a Dick Smith Electronics (DSE) 100 Watt VHF Linear Amplifier kit. -
Harris Platinum I Solid State Channel 2, and 3 TV Amplifier Modules for use, on 50 or 70 MHz -
K9EID 75W power amplifier for the six meters -
TE Systems 0510G 50 MHz meter amplifier set up for 10 watts in and 170 watts out. -
A 144MHz FM class C RF Power Amplifier based on a 2N6084 RF transistor, that can produce 50w output max -
Converting a ZETAGI B303 power amplifier for 50 MHz usage