[Premium-Rx] WJ Microwave Receivers

[Brooke Clarke]

Hi Scott:

Do you have any WiFi, Bluetooth equipment, 2.4 Cordless phone or are near a 
WiFi hot spot?  There are some listings on my Frequency Assignments web page:
http://www.prc68.com/I/FA.shtml#UHF

The military radio known variously as Bowman - H4855 - PRC-343 - Personal Role 
Radio PRR operates in the 2.4 GHz ISM band.
http://www.prc68.com/I/Bowman.shtml they show up on eBay UK every now and then.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam


S. Schappert wrote:
> G'day to the list !
> 
> Please forgive my technically off-topic post.
> 
> I recently acquired a near-mint condition Watkins Johnson Type 112 Microwave
> Receiver with tuner 2 - 4.5 GHz.  I have a couple of pretty straightforward
> questions to anyone out there with experience with these receivers.
> 
> 1.)  I am looking for any technical documentation available (please reply
> off list if anyone can help me with this)
> 
> 2.)  The receiver appears receive very low signal strength well, but I am
> curious about the RF input level.  Using an out-of-band LPDA, I am able to
> pick up signals that I have yet to characterize, but I notice that
> apparently strong audio output signals barely moves the signal strength
> meter, and using the 21.4 MHz SMO output and a working WJ SM9804A Signal
> Monitor, the output level is so low it looks almost non-existent ( No
> apparent noise being displayed on the floor at maximum gain ).  I was
> surprised to find both 21.4 AND 160 MHz SMO outputs on this receiver.  All
> other outputs (pre-detection, video, LO) are present.
> 
> I notice on the rear of the receiver there is a blank panel for an optional
> RF pre-amplifier.  Since I currently lack RF signal generation in this band,
> I cannot determine a threshold input power level for both the signal
> strength meter and detection of a signal on the SMO output.  So I am curious
> to know if the receiver input is designed to be driven at some minimum RF
> level.
> 
> I am in the process of looking at different antennas in this band, so there
> is no gain at the input currently.
> 
> I would be very interested to hear from anyone who knows these receivers, or
> could point me in the direction of some documentation.
> 
> Thanks very much in advance !
> 
> My kindest regards to all,
> 
> -Scott
> 
> 
> 
> 
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