[Milsurplus] RCH Receiver

[John J Mccarty]

Maybe one of the caps didn't reform as well as hoped. I had this happen on an
ARC-5. You couldn't build up enough voltage to bias the cathodes to turn down
the gain.


73


n9hrt

On 2/21/2008 5:52 PM, WA5CAB at cs.com wrote:
> Bob,
> 
> According to the manual, it was primarily intended as an entertainment
> receiver but good enough to be a backup for the communications receivers
> aboard (at least when it was new).
> 
> It's been 39-1/2 years but I don't recall not being able to turn the
> volume all the way down on the one we had aboard.  I just took a quick
> look at the schematic.  Check the audio gain pot.  My guess is that
> you've lost the ground connection at the bottom.
> 
> In a message dated 2/21/2008 5:19:49 PM Central Standard Time,
> w9ran at oneradio.net writes:
> 
>> I picked up this RCH from a buddy who used to collect Navy stuff, but he
>> said he'd never had it powered up.  It incubated in my garage until I
>> got around to lugging the 69 pounds (of 109 total) chassis down to the
>> bench, but to my surprise the caps reformed nicely and it came up
>> working like a champ.  It's an 11 tube superhet built by EH Scott, for
>> Navships and based on the blank "placed in service" nameplate I'm
>> guessing this one may have spent its career in a warehouse.
>>
>> What was the RCH used for?  I know Scott made "entertainment" receivers
>> that could operate from AC or DC mains but the RCH is a really heavy,
>> very ruggedly constructed set with a 120VAC power supply and BFO.  
>> Since it has both LF and HF coverage, skipping the BC band I'm assuming
>> it was a communications receiver,  but the geared flywheel tuning sure
>> makes it a great SWL band-scanner.   And it's hot from the longwave
>> beacon band all the way up to the 17meter shortwave band.
>>
>> Another question - the "Gain" control is a ganged pot that adjusts RF/IF
>> and Audio gain, but even at minimum position audio is still quite loud. 
>> Was this by intent?
> 
> 
> 
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> MVPA 9480
> <wa5cab at cs.com> (Primary email)
> <wa5cab at comcast.net> (Backup email)
> 
> 
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