[ARC5] PS Hum in BC-453-B (solved!)

[Bill Cromwell]

Hi Richard,

Thanks for your comments about that. I can barely hear the hum and not 
at all if the gain is set high enough and the antenna knob adjusted for 
me to hear any "band noise" at all. I know the caps you mentioned will 
help as the batteries discharge and I'm sure that "proper" wiring 
instead of alligator leads running everywhere will help, too. Meanwhile, 
when I am actually *using* the radio I don't hear that hum at all.

73,

Bill  KU8H

On 01/29/2015 04:53 PM, Richard Knoppow wrote:
> If you are running from DC then the hum has to be inductive or 
> capacitor coupling .  It may help to put by-passs caps across the 
> battery terminals at the receiver.  These should  be fairly large caps 
> to short any AC to ground.
>
>
> On 1/24/2015 6:15 PM, Bill Cromwell wrote:
>> Hi Les,
>>
>> I have small traces of hum in the hi-Z cans when I have the volume 
>> down low. It's barely there. I'm operating my BC-453 from brom 
>> batteries on both the heater strings and the B+. I'm thinking the 
>> exposed, randomly strung wires from the batteries are picking up a 
>> small amount of hum from the nearby power lines and their wonderful 
>> field. When I feel the urge I will replace those wires with shielded 
>> cables (or at least neatly routed  and shielded) to see if more hum 
>> goes away. I didn't notice the hum at all until I decided to run the 
>> gain down low and then it was almost not there. Maybe I shouldn't 
>> complain. The fellows on the regenrx list are whining about hum from 
>> their AC supplies.
>>
>> 73,
>>
>> Bill  KU8H
>>