New design driver amplifier for QO100

Latest News and Discussion about the use of the DATV transponder on Es'hail-2
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G3VZV
Posts: 24
Joined: Mon Feb 25, 2008 12:38 am

New design driver amplifier for QO100

Post by G3VZV » Sun May 10, 2020 12:27 pm

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/

g8vpg
Posts: 335
Joined: Fri Oct 11, 2013 9:35 am

Re: New design driver amplifier for QO100

Post by g8vpg » Thu Jul 02, 2020 9:29 am

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.

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