When I first saw the article in Dubus 1/2002, I was very impressed with the data and quality of the construction, i managed to get hold of one of PA3BIY, Peter's PCBs, and built an LNA more or less from his description

Another preamplifier design, made by Noriyuki JH0WJF

The circuit board is mounted on the underside of the top with the connectors and feed-through capacitor connections coming through holes in the board

Using a mosfet bf981 from philips to give more than 20 db gain with around 1 db noise figure on 2 meter

A very low noise preamplifier as described here is an essential must

The basis for the preamp was a schematic with a 2N5109 transistor, which is a CATV device offering high signal capability at frequencies till about 1 GHz

A simple & effective antenna pre-amp for 10m. Band 28-29.7 MHz However, this circuit was mainly realised for AO-7 Satellite

To build a GaAs FET preamp that has good gain and extremely low noise fro m readily available components

With a dualgate galiumarsenid fet CF300 with switchable amplifikation 14 and 24 dBD

Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power, FG connection

Build a broadband version which should cover 50 to 70 MHz

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

The heart of unit it's a FET BF245. You need your solder-iron, a few additional components, and about 2-3 hours delightful work

Using circuits that he built to improve 160 meter reception, Gary Nichols, KD9SV

Design of a preamplifier for the "deaf" HF receiver. When you need extra sensitivity for 15, 12 and 10 meter operation - for example for amateur satellite

Most premaplifiers have bandpass filtering at their input, and some also have filtering at their output, a preamplifier also allows you to add a sharp bandpass filter at its output without reducing signal strength or adding significant noise

The schematic and the suggestion for this good and easy to build preamplifier good for the EME

Audio schematics, preamplifiers circuits, electronics tutorials & circuits, discover engineering hobby projects

Operational amplifiers are simple to use, inexpensive and offer a very large amount of gain

New extremely hi-dynamic BGF135a preamplifier

Larry has provided everything you need to know to easily put together one of these outstanding broadband RF preamps

Originally I looked for a very low noise balanced preamplifier for dynamic microphones, but with a gain of 20 dB only

Per chi utilizza un amplificatore lineare e un preamplificatore d'antenna per low band

Front-end saver as revised by ok1rr, grounds the rx antenna whenever the tx went key-down

Most amateur transceivers include a preamp and/or attenuator, accessed either by switches on the front panel or via the radio's software menu

This is a further progression in the application of the J310 JFET in high performance preamplifiers

Low noise relais schwitched 2meter mast mounted preamplifier

A Low Noise Antenna pre-amplifier (LNA) is a simple unit which offers spectacular improvement in the quality of receiving signal, especially when the signal is very weak and it comes from long distance

My search for a low band preamp started many years ago. When I started using RX antennas for 160meter work

GF 1302 GaAs FET Low Noise Amp

Mast head low noise amplifier on the stacks and I followed Paul, G4CCZ's ideas

I managed to get the preamp performing very good and stable, the gain turned out to be even higher compared to the prototype and was measured at 24db

The mini kits eme221-70cm kit is a high-performance esigned for the 70cm band 430 to 450 MHz

Autocostruzione di un TX-RX D-ATV in standard DVB-T sulla frequenza di 1240 MHz

A low noise, high dynamic range vhf/uhf preamp that uses the minicircuits mcl pga103+ p-hemt mmic device

They lend themselves perfectly to low band applications using a high-quality receive preamplifier

The SDR hardware in its simplest form consists of a wideband switched balanced mixer and low noise LF amplifier

Situazioni tipiche dell'operatività del radioamatore nelle quali un normale preamplificatore per i 430 MHz può risultare inadeguato

Si tratta dell'amplificazione dei segnali sulla banda radioamatoriale dei 136 KHz

Il preamplificatore ha un guadagno elevato con una cifra di rumore molto bassa, si presta benissimo alla premplificazione dei deboli segnali proveniente dai satelliti

Un preamplificatore per i 144 MHz di costruzione casalinga

This good and easy to build preamplifier good for the EME

The design uses source feedback and has a diplexer on the output

Radio preamplifier for 2 mtr reciever the gain is near 20d

A low noise radio antenna preamplifier for the 1 to 30 MHZ frequency range. This kit is based on the classic design of W7IUV

Progetto di un'antenna a loop attiva di JohnHawes G8CQX con alcune variazioni

The preamplifier is the most important part of the whole unit, due to it being a narrowband amplifier it is mandatory in order to avoid receiver front-end overload especially that caused by nearby TV

The sid seizer is a vlf/lf receiver project for monitoring sudden ionospheric disturbances, typically caused by solar flare

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

The preamplifier described here was realized with an ultraLinear low noise monolithic amplifier PGA-103+

This mmic is designed for use as a general purpose 50 w gain block, applications include narrow and broad band if and rf amplifiers in commercial and industrial applications

Wideband small magnetic loops WSM loop are used already 3-4 decades and I was curious to see what can be reached with them and to evaluate their usefulness as a wideband SDR input

FT-847 has a build in preamp, but it seems to have poor gain at 70mhz,so I decided to add another preamplifier stage