[ARC5] [Milsurplus] BC-669 Vet Project: PE-110 Power Supply

[Kenneth G. Gordon]

On 24 Sep 2019 at 12:49, David Stinson wrote:
 
> Re: BC-669 Mystery Relay.
> For those, like me, scratching their heads over why the factory installed a 12VDC Antenna/TR 
> relay in place of a 115VAC relay, here is a link to the manual:
> 
> BC-669 Manual 1944
> 
> The PE-110 power supply, which fits at least the -A, -B, -C, -AM, -BM, -CM models (the most 
> common).  The PE-110 supply is on page 25.  VP-1 is a vibro-pack to provide Receiver B+ from 
> 12 VDC battery, but not Transmit power.  That's strictly 115VAC, so a 12 VDC TR relay is 
> strange.  PL2 on the Modulator deck mates to PL6 on the power supply.
> 
> 73 DE Dave AB5S

Well, reviewing the manual, and thinking about what you've found, I really think the error 
was done at the factory.

One other thing that puzzles me is why the 12VDC relay didn't almost immediately burn out 
when 115 VAC was applied.

Ken W7EKB