[Premium-Rx] WJ Mystery Device

[Ed Tanton]

Hi George... I'd say it likely is an SPDT UHF/microwave coaxial switch. If 
that is true, but there's no way to input a voltage separately, I'd further 
bet that you'll find DC (but not RF) continuity to ground on the INPUT 
connector's center conductor, probably (but not absolutely) something that 
would work well at, say, 26.5VDC. They isolate the output(s) using series 
capacitors, and you must provide both the DC and RF isolation at the input, 
using a series capacitor, and a switched DC voltage on the relay ("INP" 
side) of that INPUT capacitor. You isolate the DC from the RF using a 
series RF choke. The INPUT would normally (N/C) be to the OUTPUT unless 
active, when the INPUT will be switched to "SW" (the N/O side of the SPDT 
switch.) Note that there is SOMETIMES  a diode in series as well... in 
which case you would have to supply a -26.5VDC/whatever. Not likely, but 
possible.

73 Ed Tanton N4XY <n4xy at earthlink.net>

Ed Tanton N4XY
189 Pioneer Trail
Marietta, GA 30068-3466

website: http://www.n4xy.com

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LM: ARRL QCWA AMSAT & INDEXA;
SEDXC NCDXA GACW QRP-ARCI
OK-QRP QRP-L #758 K2 (FT) #00057

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