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

[Brooke Clarke]

Hi Dave:

It sounds like a VXI card like those made by Agilent (HP).  Is it VXI 
format?

73,

Brooke Clarke, N6GCE

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Dave Emery wrote:

>	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 ...
>
>  
>