Ham Radio Preamplifiers: Improve Signal Reception
Find schematics and designs for building preamplifiers to enhance weak signals across various amateur radio bands.
Preamplifiers are crucial for improving weak signal reception across all amateur radio bands, from the 2200m band up to VHF and UHF. Hams often build or integrate preamps to boost signals before they reach the main receiver, which helps reduce noise and enhance the clarity of distant QSOs. This is especially important for DX work or when operating on less common frequencies where signals might be very faint.
Operators can find many homebrew projects for antenna preamplifiers, including designs for specific bands like 10m, 6m, or 2m. Many designs feature common components such as FET transistors, like the reliable U301 FET preamplifier, or specialized GaAs FETs for very low noise applications. There are also wideband preamps based on MARx-series monolithic amplifiers, suitable for various HF/VHF/UHF uses, and even microphone preamplifiers for improving audio quality from handheld transceivers.
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A DIY project for a 137 kHz antenna preamplifier, enhancing reception on the 2200m band for transceivers like the FT-817. Includes schematics. -
Electronic circuit and components layout fot this VHF Preamp -
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. -
A preamplifier project based on Rainer DJ9BV project, in french -
KD9JQ 2 meter GaAsFET preamplifier by KD9JQ -
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. -
A dead easy 50 mhz preamp by VK3CJS -
Page on amplification topics. From vacuum tubes to various components, discussion on stability and arcin causes. -
A simple & effective antenna pre-amp for 10m. Band (28-29.7 MHz) -
How to get the most from attenuators and preamps -
Easy circuit that provide good gain to weak audio signals -
Design guidelines for Op Amp audio preamplifier circuits by Mike Martell N1HFX -
Homebrew with CF300 DGMF with about .24 dBD gain -
There are many designs for building preamps each with their own advantages and disvantages. In this PDF Article author reviews several different types. -
Presents two wideband RF preamplifier projects: one using MAR-6/PGA103 MMICs (DC-2GHz) and another with a BSX-20 transistor (14-550MHz). Includes -
Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna. -
A universal LF/MF preamplifier by Lyle Koehler, K0LR -
A microphone preamplifier schematic for hand-helds by ON6MU -
Mizuho Tsushin Co. was a small Japanese manufacturer of QRP radios and kits, shortwave receiver accessories, and AM broadcast band receiver kits and antennas -
Angle Linear has been producing GaAs FET preamplifiers since 1980 -
Preamp & Power Amp By Alkberto, I0XGR -
Detailed design guidelines for bipolar transistor audio preamplifier circuits, including schematics, component selection, and performance analysis. -
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. -
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. -
Low Noise Antenna pre-amp for SAT, EME & DX-ing -
ON6MU project for a vhf uhf preamplifier -
Schematic and pictures of a W7IUV preamplifier -
Pre amplifier using a 2N5109 for the 160 meters band -
Wideband VHF/UHF/SHF monolithic PreAmp based on MARx-series by ON6MU -
An home made low noise preamplifier project for 144 MHz, with detailed circuit diagram. The VLNA-144 preamplifier has been Published on DUBUS 4 2019 -
Here are some hints and tips for construction of a good preamp for satellite work. -
An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design -
The prototype for this amplifier was originally designed for 70cm and was used on the 2004 3B9C Dx-pedition to Rodriguez Island for satellite and EME. It had a noise figure of 0.49dB with an associated gain of 20dB. -
A ham radio home made preamplifier for 50 MHz and 70 MHz bands -
Low signal, noise-high AC gain preamplifier -
ON6MU Low Power amplifier -
Who needs a GaAsFET? Tuning, constructions and Packaging by Paul Wade -
Extremely reliable FET preamplifier can handle several watts directly into either the input or the output without failure -
2m 70cm 23cm Low noise Amplifiers, 3 Low noise amplifiers Outdoor unit with DB6NT parts completed.