[Milsurplus] ARB surplus dealer conversion on Ebay ?

[Ray Fantini]

For those who have not experienced the AN/URC-7 in person:

http://www.virhistory.com/navy/xmtr-xcvr-ship.htm

Its huge, heavy think it ran around 25 watts or so of plate modulated AM with a Modulator power supply on the bottom, receiver on the mid deck and transmitter on the top deck. Used 807 from what I recall in the TX and seven and nine pin tubes in the receiver.  All crystal control and for some crazy reason I remember they came up with a retrofit kit that had a Collins mechanical filter on it that directly plugged into one of the IF amplifiers.  Don’t know for certain but it must have weighed well over 250 pounds and the ones I saw were all 120 volt DC operation only. Think there was a dyno on the receiver that converted the incoming DC to AC at 120 volts so for AC conversion you just removed that but the one in the transmitter put out some high voltage like 600 to 1,000 volts.
I am told that prewar and for some period of time after the war 120 volt DC was common in commercial shipping. On the lightship that I saw two of these on they had a huge bank of car batteries on top the bridge as backup power.

Ray F/KA3EKH


From: WA5CAB at cs.com [mailto:WA5CAB at cs.com]
Sent: Monday, February 20, 2017 4:04 PM
To: Ray Fantini <RAFANTINI at salisbury.edu>
Subject: Re: [Milsurplus] ARB surplus dealer conversion on Ebay ?

I don't really have any information on it but my database entry and TM 11-487A (1959) say that AN/URC-7Z was 2-Channel.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 02/20/2017 14:00:39 PM Central Standard Time, RAFANTINI at salisbury.edu<mailto:RAFANTINI at salisbury.edu> writes:

AN/URC-7 if it’s not the size of a Yugo it weighs as much! The big issue would have been obtaining the 120 Volts DC at a thousand amps to run it.

I was looking for some information about Marine MF radios and came upon this history of a West Coast Marine electronics company:



<">http://www.rodgersmarine.com/history.htm><http://www.rodgersmarine.com/history.htm>

In paragraph 10 they describe the prichase of a boat in 1956 and state  " Located in the bow of his boat was a military surplus six channel AM transceiver the size of a Yugo."

Does anyone have any idea what that radio could have been?

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20170220/7674e311/attachment-0001.html>