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Amplifiers Amplifiers
Idiot's guide to RF amplifiers

Sooner or later you'll find your self wondering "Isn't there a way to get more range?". Sure there is, there are more actually. The best would be to improve your antenna system, but sometimes this isn't possible for objective reasons. It is also possible that you allready have very good antenna system as it is. You've got to increase your power....

Universal bipolar power amplifier

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Here are a pic of a VK200 wideband choke and a table of transistors that you can stick into this amplifier. Emitter leads of the power transistor have to be kept at minimum (every single additional millimeter means less gain and less output power). Use large (appropriate) heat sinks. Do not strain transistors too much when you mount them, ceramics can break. If you can't max the amp with shown trimmer caps, use bigger values or add 10-22pF in parallel. Some coils might need a winding more in some cases. Need printed circuit board for this? See the table below to order the PCB...

Amplifier designs from Motorola (1Kw, 300W, 600W)

Here are the 1KW amp, 600W amp, 300W and 150W amp and these usefull datasheets; Amp1, Amp2, Amp3, Amp4. These are all extremely valuable to any builder, have a look and enjoy.

General tips

Earthing straps, mounting and PCB example. Discuss this article in our Forum!

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01.25-ohm flexible coaxial cable (2.87mm dia white), per foot
02.25-ohm flexible coaxial cable (2.45mm dia white), per foot
03.1m H-2010 low loss (1m)
05.0-30V/5A laboratory power supply
06.1m RG213U
07.RDS MAX 4000+ (no enclosure)
08.LCD module for MAX PRO 3000+
10.TC-18 coaxial cable, per foot
48V/1800W 220V power supply with connector
48V/1800W 220V power supply with connector
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