[Milsurplus] 400 MHz cavity

[Jim Whartenby]

I would say that the URC-9 is similar to the VRC-24 in that both are UHF Transceivers and that the modules look to be similar but the modules are not interchangeable, specifically the PA module.  Now the TRC-68, GRA-53, GRA-54 and the VRC-24 all seem to have the same modules, but I never worked an the VRC-24 which is a 28 volt DC powered unit.  
When I was in the Air Force, stationed in the Philippines, I worked on the TRCs and GRAs.  They ran so hot that one had to wait half an hour for the R/T unit to cool off before you could carry it back to the shop.  Fun times! 
The URC-9 was Navy equipment and they never seem to buy "off the shelf", they always have to change things!  <grin>  The URC-32 vs the KWT-6 Type 8 is another example.JimLogic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Sunday, March 30, 2025 at 04:56:21 PM CDT, frledda at att.net <frledda at att.net> wrote:   

 
More info below:

https://www.navy-radio.com/xmtrs/src20.htm

  

  

From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of frledda at att.net
Sent: Sunday, March 30, 2025 4:54 PM
To: 'Gary Hitchner' <talgarth at comcast.net>; Milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] 400 MHz cavity

  

Gary,

The cavity amp you have was part of the Collins AN/SRC-20.  The transceiver/exciter is the AN/URC-9, also known as AN/VRC-24.

It is a nice amp that can be easily tuned to 432 MHz.

Best, Francesco K5URG



  

From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of Gary Hitchner via Milsurplus
Sent: Sunday, March 30, 2025 2:50 PM
To: Milsurplus at mailman.qth.net
Subject: [Milsurplus] 400 MHz cavity

  

List, 

I have two of these which are going to scrap unless someone tells me there is a reason not to.  (Or picks them up local).  Large and heavy. 

These are a 225- 400 MHz cavity that used 2- 4CX250k’s in parallel, evidently  conversion to 432 was possible, but a project.  Fair Radio might have had them in stock for a while, or maybe Skycraft, not sure.

Often wanted to see the entire assembly these were in, must be something to see………….

Gary

WA2OMY
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