In addition to mounting all but the inductors and transformers for 80m the Warbler and a few more components for the 40m WSPR Warbler I have built a RockMite 30, for use as a Grabber RX only for 30m.
The evening welt with getting the Local oscillator (10.140MHz Xtal) down to 10.138.700. This is done by bypassing the frequency switching, using a simple serial connection of a 10uH inductor and a variable capacitance ( 12 - 30pF ).
The input Xtal filter will be added later, after stability test of the local oscillator, and will probably be a simple SIngle Xtal tunable filter.
Tomorrow will be busy with some non radio activities, so progress will be much slower than it has been this week end.
KE5HPY's Altoids Direct-Conversion Receiver for 40 Meters
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Click on the image for a much clearer view.
*It is a thing of beauty. You can see all four stages in there. There is
the Bandpass Filter in the upper l...
3 hours ago
Interesting... one may also consider penning down a crystal... hmmm, I will look into this.
ReplyDelete73, Joachim