Looks like I blew my sband LNA.
I noticed that I could not hear the "beacon" sat signal on 2242.488, so checked. changed the LNA to another one, and signals came back - probably with a slightly higher Noise Figure (L-band LNA).
so - I opened the LNA and what did I find ? it is not a GaAs Fet amplifier as such, but a GaAs MMIC. Not really a problem, I have a replacement with the same pinout - only snag - it is SMD, so I hope my soldering and vision will up to the challenge.
LNA Spiritus Basta !
Why did this happen ? I transmitted on 2m with an antenna too close to the sband antenna. Oops !
Audio Amplifier Stage Template and Handout: SolderSmoke Direct Conversion
Receiver by N7HPR
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*Above is Steve N7HPR's template for the audio amplifier board, the board
that gave a lot of people a lot of trouble. But it SHOULD have caused a
lot...
2 days ago
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