[Milsurplus] URC-35?

[W2HX]

Question on this radio. I have one too. Mine was also kinda working (no side
band reception but AM ok) and it quit. I haven't even opened her up yet, but
this DC converter failure sounds interesting.

Can anyone confirm if a symptom of the amp power switch refusing to switch
on (keeps tripping the breaker) is a typical symptom of DC converter
failure?

Also, question for Paul: You mentioned that the DC converter used in the
WRC-1 is insufficient for the URC-35. If I were to look out for a
replacement DC converter what would I look for to avoid or look for to get?
Is there a particular part number I should try to get?

Also it would seem counterintuitive to me that the WRC-1 supply should be
insufficient for the URC35. With a separate Tx and Rx of the WRC-1 I would
have thought that it would have higher power requirements and thus a
sturdier supply.

BTW: Are the DC-DC converters repairable? Or is it best (or even possible)
to just get a replacement?

73 Eugene W2HX

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Joseph Pinner
Sent: Monday, May 18, 2009 3:57 PM
To: Military Radio Radio
Subject: Re: [Milsurplus] URC-35?

Paul,

I have a URC-35B that I purchased from Jim Karlow a number of years ago.

I like it but I do agree with other comments that it does not put out  
100 Watts.

Some time ago it ceased working and I did not get around to working  
on it until this weekend. Sure enough, it has a bad DC to DC  
converter module and the appropriate burned area (around a fried 2W  
resistor) and a couple of 1 mf 150v caps that have failed.

Could you give me suggestions from your experience on anything I need  
to do to make appropriate repairs. I do have a complete manual but I  
know that experience beats the manual any day.

Joseph Pinner +
KC5IJd / NNN0PHR


On May 3, 2009, at 8:21 PM, paul alexander wrote:

> The biggest problem the URC-35 had was the DC to DC converter.  This
> is a large module, located in the center of the AM-3007, and supplies
> power to both the power amplifier and exciter units.  When the correct
> power supply was installed, the units were quite reliable.
> Unfortunately, most of the units got a similar power supply from the
> WRC-1 set.  The Supply system had the WRC-1 power supply listed as a
> suitable substitute, but, it was not.  Also, the WRC-1 supply was
> usually the only one the supply depot had in stock. You can identify
> the wrong supply by large burned areas on the circuit boards.

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