[Heathkit] HP-13A question

[Steve Sutfin]

Thanks Mike,
I should know to always get a manual first. I was using the pin diagram 
from my SB-102 manual which shows the 11 pin radio plug end. I had no 
idea that there was a relay in the HP-13A.
BTW, when I energize the relay I get a medium/high pitch 'whizzing' 
sound. Is that normal?
tnx agn,
Steve k7dna

On Sep 6, 2008, at 11:09 AM, Michael Waldrop wrote:

> Base on the HP-13A's manual, page 17, 12VDC positive is fed through an 
> inline fuse with the proper rated fuse, to pin 6 of the Jones 
> connector and pin 7 is grounded to the 12 VDC source.. As can be seen, 
> pin 7, through the supplies interconnecting cable to the radio, is 
> routed to the radio's front panel ON/OFF switch.
>
> If you don't have the manual, you can download the pages at the 
> following website:
>
> http://bama.edebris.com/manuals/heath/hp13a/
>
> The page I am talking about is in the link "hp7a4d~1.jpg"
>
> under the paragraph titled "SWITCHING". Use a heavy gauge wire to 
> connect the supply to the DC power source  and the proper rated fuse 
> between the supply and the DC source. Make sure the DC source can 
> provide the required current, even at idling, no load on the supply.
>
> 73
> Mike
> W5RKL
>
>
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