Progress continues on my WSPR direct conversion receiver. The Colpitts oscillator is working nicely and is very stable. Yesterday I glued an SBL-3 diode ring to the board and hooked it up. With my 'scope and sig generator I can see it turning 30 meter RF into audio. So far so good.
Now it is time to build the AF amp. Here's my question: How many db do I need? The standard 100 db DC RX AF Amp seems like a bit of overkill -- this thing won't drive a speaker or a headphone, but instead, a computer soundcard. What do you guys think? How many db?
Re: Vintage Lafayette Station - WA1KPD
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Quote from: Carl WA1KPD on *Today* at 06:18:38 PM
Quote from: Pete, WA2CWA on *Today* at 03:06:34 AM
REF: http://amfone.net/Amforum/index.php?topic=48737.0;...
41 minutes ago