[AMRadio] BC-610

[Warren Elly]

Don... you are the man!
Thanks for the suggestion, I will check that out.
Happy Holidays... hope to work you a few times this winter...

73, Warren


On Nov 23, 2011, at 7:02 PM, D. Chester wrote:

>> From: Warren Elly <w1gud4 at gmail.com>
>> 
>> My I Model sealed mod tranny has "talked back" from day one (five years on 
>> air), reminds me of the
>> broadcast boxes I was around as a 3dclass endorsed kid reading meters in 
>> the 60ies...
>> 
>> My beast sits 6 feet behind my operating postion...but I've operated 
>> sitting in front of it as well, and never found the talk back to be a 
>> problem...
> 
> 
> Are you sure it is the mod transformer, not the overload relay that is doing 
> the talking back?  The cure for that problem is to wire a capacitor between 
> the midtap of the power transformer and ground - something very easy with 
> the open frame plate transformer, but more difficult with the potted version 
> with the terminals on the bottom.  That by-passes the relay at audio 
> frequencies, but allows it to still function to pull in with an excessive DC 
> load on the power supply. Use a "computer grade" electrolytic, about 100 
> mfd.  The positive terminal  goes to ground and the  negative to the 
> transformer.
> 
> Don, k4kyv
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