AN/URM-90 Impedance Bridge Questions
Rob Dunn
dunnr at IX.NETCOM.COM
Wed Jul 28 15:38:16 EDT 1999
Hi All,
First I would like to say thank you to all who provided me with insight into
the R-174 that I acquired this weekend. Special thanks to Tom Norris who
sent me a scanned schematic of the radio and power supply. I have traced
out the hombrew supply and it parallels the original in function if not in
design (uses a sand-state power transistor as a series pass filiment voltage
regulator).
Secondly I have what appears to be an even tougher question. Along with the
R-174 I picked up one each USM-116A and USM-116B VTVM's with RF probes and
one had the basic docs with it so I have a schematic, etc. Hopefully these
will work as well as a a HP-410B/C for boatanchor work. I also acquired an
AN/URM-90 Impedence Bridge (along with a mine detector, radiac meter, vacuum
pump, etc). I looks like a great bridge and appears to be healthy but I
don't have any documentation for it. A search of the net only results in a
couple of hits and only one manual site, W7FG. W7FG's web site is down so I
have no source of a manual. Does anybody have any information/experience
with the URM-90 and/or know how I can get a manual?
As always, thank you in advance for your help.
Rob Dunn
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