[Premium-Rx] WJ-8645B - what is it ?

[Dave Emery]

	This may and may not be a bit off topic,  but I recently
acquired from the e-place a WJ8645B computer controlled receiver on a
card.  It is a fairly recent (1996 ?) RS-232 controlled receiver card
about 14 inches by 4.5 inches by 3/4 inch thick.

	I am very curious if anybody out there has any clue as to what
frequency range this receiver covers and any other details about  it -
so far web searches have turned up nothing...  and naturally any
pointers to any kind of documentation would be greatly appreciated.

	It has a SMA connector marked RF input, a SMB connector marked
10 mhz ref input, another SMB connector marked 40 khz IF sample out and
a full DB-25 male for RS-232 control, plus a DB-15 marked Data output.

	From various markings it appears to have 40 khz third IF, a  455
khz second IF and an unclear 1st IF with marked test points for three
different LO lock indicators for a 1st, 2nd, and third LO.  It also has
an LED marked RUN/ERROR.

	It appears to be powered by + 28 volts.

	Perhaps the oddest marking is TP18, Conversion Counter Out...

	Superficially this thing appears to be a receiver that dumps
I and Q samples out the DB-15 connector somehow with a 40 khz DSP
based last IF.    This would imply a fairly small maximum bandwidth
(say 15 or 20 khz)... which suggests HF or low VHF...  the seller thought
it was UHF somewhere (1000 mhz).

	But it also appears that probably a bunch of these were stacked
in some kind of array... 

	I suppose I can power it up, supply a 10 mhz reference and see
what I can do with the RS-232 port, but perhaps someone out there
actually recognizes this thing and knows about it ...

-- 
   Dave Emery N1PRE,  die at dieconsulting.com  DIE Consulting, Weston, Mass 02493