Lyle and all - You wrote:
"You want the softrock injection on the LOW side of 8.215 MHz. I
can't tell
you what the best frequency might be because I don't know, but I
suspect 8.200
or thereabouts. "
If you place the local oscillator on the low side of the IF by an
amount slighter greater than the IF bandwidth you don't need an I/Q
or software receiver at all do you? The signals you want will be in
the IF pass band above the local oscillator and the images will be
below the oscillator, you will get single signal reception from a DC
receiver. You will need a wide audio filter, but you may be able to
implement a simple one in the computer. Dave Benson's Warbler on 80 M
uses this technique. Then just use one of many spectrum analyzer
programs for your shack computer to display the signals in the
bandwidth. These are usually good to at least 20 kHz or half the
sampling rate. Or am I missing something simple? - Duffey
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