Watkins Johnson WJ-1289/TN-121 5-18 GHz Wideband Tuner RF Goodie Box RARE! READ

Description

This is a wideband tuner for the WJ 1289 ELINT/EW receiver system, made by Watkins Johnson, model TN-121/WJ-1289, SN 1 (!!), covers 500 MHz to 18 GHz in two bands, .5-8 GHz and 8-18 GHz.  Stuffed full of fairly modern RF parts. This uses the modern method of making an 8-18 swept front end and then using an up-converter to cover .5-8 GHz by block mixing it up into the swept band. Allows the use of one wideband LO and phase lock system, simplifying control. This unit has a dual IF system,  the first one is at 400 MHz and the second one is 160 MHz.  Uses serial datacomm for control over triaxial TNC connectors, which I believe is Mil Std1553.The dip switch on the front is for address selection for the unit. It is microprocessor controlled using a Rockwell 65C02 MPU.  I have listed it as "Parts" as I have no way to control it and so have not fired it up, but it is complete.  It uses an internal 10 MHz standard (can also use an externally provided one) for the ref input to the phase lock synthesizer (LO synchronizer) system. This thing is really something, I like it a lot but I have more stuff than I will ever get to, so its time to pass it along but it is pretty cool!  Anyway, you will have fun with this if you like RF/microwave stuff!  I have no docs, so do not know the command strings or pin outs. I assume if you know serial differential comm like 1553, you will have no problem, and you can probably read the eproms to figure out the command strings. If I stripped it (which I am loathe to do, this stuff has become rare), I could get my money from the yigs, wideband mixers, etc.   Have fun!