tube amp

Quarter Wire to Copper Tube Slim-Jim - K0GKJ project of a copper tube slim jim antenna for two meter band

W6RK County Hunting Spots - County Hunting Spots in the Web

HamPage.com - Amateur radio start page (or "jump page") with categorized links on one screen-size page, making HamPage.com a time-saving default browser page for ham shack computers.

How to select an amplifier - Thierry LOMBRY, ON4SKY, develops in three long articles all you need to know about amplification, and how to seletc an HF and a solid-state amplifier, with pictures.

Adventures in GPS antenna construction - Adventures in amplified GPS antenna construction; an experiment

FT-1000MP Band Select Output and Amp Keying Interface - FT-1000MP Automatic Band Selection Interface Bob Wolbert, K6XX

Morse Pilot - Morse Pilot is a popular and very comprehensive freeware Morse code tutor, trainer with decoder and encoder functions. Morse Pilot is intended for personal training, for example for radio ham or aviation examinations.

SP5GJN - HF Power Amplifiers  ^pop - HF home meade power amplifiers by SP5GJN

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

430MHz ATV transmitter - ATV transmitter on 430MHz band used with special transmitting tube named 5894 for final stage. Run about 10W average for TV signal and 20W at synchronous peak. Final stage control gird modulation works well for NTSC color video signal and good at audio as well.

W7IUV HF Preamplifier - Schematic and pictures of a W7IUV 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.

VHF UHF preamp - ON6MU project for a vhf uhf preamplifier

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

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

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.

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.

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

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

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

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.

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.

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

EMI from RF-Driven Lamps - Information about RF driven lamps

EMI from Lamps - Radio Frequency Interference To/From touch lamps and dimmers