[Collins] humm

[Tony Sokol]

Opps!  Sorry 'bout that.  I misunderstood you first post thinking you 
thought the hum was coming from the power supply.  Good luck on your 
hunt for the culprit. 



Dr. Gerald N. Johnson wrote:
> On Fri, 2009-04-10 at 12:48 -0500, Tony Sokol wrote:
>   
>> Martin,
>>
>>     Are you talking about a physical hummmmmm vs something that others 
>> are hearing on your signal?  If so, changing the caps will not help, A 
>> physical hum or buzzing sound is usually do to the laminations in one or 
>> more of the various transformers and/or chokes vibrating especially 
>> under load.  In this case tightening the hardware on the offending 
>> transformer or choke MIGHT help the problem.  In most cases the only 
>> real fix is to have the transformer rebuilt.  You may also get away with 
>> taking it to a local motor rewinding shop and having it "redipped"  in 
>> lacquer.  Or.....you just put up with the annoying buzz until it gets 
>> bad enough to make you do one of the above mentioned procedures. 
>>
>>   73
>> Tony - W9JXN
>>
>>     
> There are no iron cored components in the 32S transmitters. So it has to
> come from the 516F-2 power supply, either audible or as modulation of
> the RF output by power supply ripple.
>
>