Preamplifiers

Low noise preamplifiers - Lot of projects of preamplifies from HF to VHF and UHF by yu1aw

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.

VHF UHF preamp - ON6MU project for a vhf uhf preamplifier

2m Band VHF antenna pre-amplifier - Homebrew pre-amp for 144-146 MHz amateur band and OSCAR Satellites, using BF981 Dual-gate MosFet. Gain ~15 dB, NF=1dB.

GaAs FET preamps - Build a good GaAs FET preamp for 2 meters, 222 or 440 Mhz

U301 FET preamplifier - This FET preamplifier has been around for almost 25 years. It is extremely reliable and can handle several watts directly into either the input or the output without failure.

MGF1302  GaAsFET - Published in Radioamater - CQ YU and CQ ZRS magazines, MGF1302 144 MHz and MGF1302 432 MHz

6m Preamp - A dead easy 50 mhz preamp by VK3CJS

Low noise preamplifiers  ^pop - Lot of projects of preamplifies from HF to VHF and UHF by yu1aw

137 kHz antenna preamplifier - A simple 137 kHz antenna preamplifier to make your FT-817 (and others) useable on 2200m band.

144 MHz Antenna Pre-Ampilfier - Electronic circuit and components layout fot this VHF Preamp

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.

144Mhz preamplifier - A preamplifier project based on Rainer DJ9BV project, in french

2 Meter GaAs FET Preamp - KD9JQ 2 meter GaAsFET preamplifier by KD9JQ

23 cm GaAs FET preamplifier - On 23cm the best way to obtain a good RX-sensitivity is to use a GaAs-FET in the front-end, since these devices show very low noise figures.

23cm dual stage preamp - A modification / combination of the DJ9 BV & I5TDJ 144 MHz preamp designs

2m Band VHF antenna pre-amplifier - Homebrew pre-amp for 144-146 MHz amateur band and OSCAR Satellites, using BF981 Dual-gate MosFet. Gain ~15 dB, NF=1dB.

6m Preamp - A dead easy 50 mhz preamp by VK3CJS

Amateur Radio - Microphone Preamp - Low signal, noise-high AC gain preamplifier

Amplifiers and Vacuum Tubes Tuning Loading and Arcing - Page on amplification topics. From vacuum tubes to various components, discussion on stability and arcin causes.

Antenna pre-amplifier for 10 m - A simple & effective antenna pre-amp for 10m. Band (28-29.7 MHz)

Attenuators and Preamps - How to get the most from attenuators and preamps

Audio Preamp - Easy circuit that provide good gain to weak audio signals

BFP196P  BJT - BFP196P BJT by Infineon vs BFG540X BJT by Philips

Designing Op Amp Audio PreAmplifiers - Design guidelines for Op Amp audio preamplifier circuits by Mike Martell N1HFX

DL5DBM`s 2 meter Antenna preamp - Homebrew with CF300 DGMF with about .24 dBD gain

GaAs FET preamps - Build a good GaAs FET preamp for 2 meters, 222 or 440 Mhz

Garex VHF preamp - It is available for spot frequencies in the range 40 - 250MHz, where a typical gain of 26dB can be achieved

General purpose RF Wideband PreAmp - General purpose RF Wideband PreAmp based on BSX-20 transistor with a frequency range 14-550 MHz

Homebrew UHF Preamplifiers - Amateur Radio UHF Preamplifiers HJ-FET/GasFet

Improving Receiver Noise on 50 MHz - Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.

LF/MF Preamplifier - A universal LF/MF preamplifier by Lyle Koehler, K0LR

LNK Receiver Preamp - It is tempting to hope that a preamp can make any receiver more sensitive, in any situation. But, it is important to understand what happens when you add a preamp before a receiver.

Low Power LF Amplifier - ON6MU Low Power amplifier

MGF1302  GaAsFET - Published in Radioamater - CQ YU and CQ ZRS magazines, MGF1302 144 MHz and MGF1302 432 MHz

Mic Pre Ampllifier - A microphone preamplifier schematic for hand-helds by ON6MU

Mizuho products - Mizuho Tsushin Co. was a small Japanese manufacturer of QRP radios and kits, shortwave receiver accessories, and AM broadcast band receiver kits and antennas

Motorola Micor Highband Preamp - Make 150.8 - 174 Mcs. RF Preamp properly tune the Two Meter ham band.

PHEMT (GaAs FET) Preamplifiers - Angle Linear has been producing GaAs FET preamplifiers since 1980

Preamplifier for 144 mhz - CX2UA 144 mhz preamplifier homemade project in spanish

Radio Preamplifier for 2 mtr reciever - 20db gain 144 Mhz preamplifier by Harry Popov LZ1BB

Receive only processing equipment - One of our most popular products, receiving preamplifiers are used for achieving top signal band performance in competition operating, low noise longwave reception, repeater applications into the UHF region, or lab use

Small Signal RF Amplifier - A bipolar small signal RF amplifier

The 50MHz Assistant - Preamp & Power Amp By Alkberto, I0XGR

Transistor Audio Preamplifier Circuits - Design Guidelines for Bipolar Transistor Audio Preamplifier Circuits By Mike Martell N1HFX

Tri-Mode Buffer Amplifier Box - The TMB-1 is an RF amplifier unit / receiving accessory that can be used with a low-impedance broadband loop, a high-impedance terminated loop (such as a Pennant, Flag, or Kaz Delta), and whip (telescoping rod) antennas.

U301 FET preamplifier - This FET preamplifier has been around for almost 25 years. It is extremely reliable and can handle several watts directly into either the input or the output without failure.

UHF Low Noise Antenna pre-amp - Low Noise Antenna pre-amp for SAT, EME & DX-ing

VHF UHF preamp - ON6MU project for a vhf uhf preamplifier

W7IUV HF Preamplifier - Schematic and pictures of a W7IUV preamplifier

W7IUV Low Band Preamp - Pre amplifier using a 2N5109 for the 160 meters band

Wideband PreAmp's for HF/VHF/UHF - Wideband VHF/UHF/SHF monolithic PreAmp based on MARx-series by ON6MU