BATC Forum

Hi all,

At last, I was hoping to join the QO-100 Net this evening but of course the Gremlins have struck. The TX line up is Pluto - SPF5189Z - Chinese 400-4GHz amp - Nokia module, the Chinese amp is dead anywhere above 1.5GHz.
Can anyone recommend a suitable replacement that isn't going to a) take months to arrive, b) cost an arm and a leg).

73 Dave.

You might try fixing the amplifier, these PAs sometimes have the wrong parts fitted. Perhaps post a picture? I would suspect the RFC and the coupling capacitors.

Otherwise, the Amsat-UK amplifier by G0MRF is a good choice. Here is the kit.

https://shop.amsat-uk.org/Filtered_S_Ba ... 51527.aspx

Mike

I'd second Mike, I have used one of the Amsat amps since the beginning. It goes Pluto (at -10-15dB) into the Amsat amp and then into a Nokia (3 stages from memory...). That has lots of gain - there are many different versions.
Gareth

Thanks Mike, Gareth.

I'm on the case!

Bypassing the amp I'm getting about 1.5W and can just see my signal on the downlink, looking promising.

73 Dave.