[ForSale-Swap] watkins johnson H.F. receiver 'essence'
tongaloa
tongaloa at alltel.net
Mon Jan 20 17:39:27 EST 2003
No schematic but this baby looks like it a block converter
followed by a tunable IF. Digitally tuned, you provide the
digits once you figure out where they go.
approx 12" x 5" x 2" chassis has 8 circuit boards.
1) RF in, bandpass filter, WJ M6D mixer
2) Frequency synthesizer for above (coarse tune?)
3) It's a two board affair, one digital one analog
4) xtal bandpass filter either 100kHz or 200kHz, don't recall, to
5) M6D mixer board
6) Frequency Synthesizer for above (finer tune?)
7) It's a two board affair, one digital one analog
8) I.F. board MOMBO xtal filter by Alpha CF-2.0019MHz
BW-3.2kHz with MC1496 mixer (AFAIK there is no LO
signal generated on this board)
So, it's pretty much an H.F. receiver provided you
a)mix to match the input bandpass or bypass it and extend
the range of the coarse synth
b)provice a LO for conversion to 'audio' baseband
I'm thinking it would make a nice core for a receiver to use
with linrad.
Condition=good
Manual=no
Anyway, $65 includes USA postage $2 extra for insurance.
-bob
ah7i
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