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New design driver amplifier for QO100

Posted: Sun May 10, 2020 12:27 pm
by G3VZV
Filtered 2400 MHz Driver Amplifier Kit designed by David Bowman G0MRF now available.

Contains all the parts required to drive a PA on 2.4 GHz for QO-100. The completed board will have a gain of about 25 – 26 dB and for best linearity, should be kept to 200 mW output

https://amsat-uk.org/2020/05/10/filtere ... fier-kits/

Re: New design driver amplifier for QO100

Posted: Thu Jul 02, 2020 9:29 am
by g8vpg
AMSAT also produce a 5W amplifier kit for 2.4GHz. I've recently been testing mine and have found that linearity is much improved if the recommended quiescent current is increased from 100mA to about 220mA. On ATV duty, this improved the shoulders by around 10dB. Going beyond 220mA didn't seem to produce any further improvement.
73 Shaun.