[Milsurplus] URC-7

[Hubert Miller]

I thought it looked familiar, RCA, and i see that i’m right, by the spec sheet on Nick’s site.
Looking at the manual for the commercial product, i was astonished by how heavy this thing was, for the power output.
-H

From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Ray Fantini
Sent: Monday, February 20, 2017 1:18 PM
To: WA5CAB at cs.com; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] ARB surplus dealer conversion on Ebay ?

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

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