[Amps] Centurion cooling improvement ideas for AM service

[Gary Schafer]

Paul Christensen wrote:
>>The "carrier" that you hear on these signals is probably not carrier but
>>inband IM products from the low frequency audio signals. Listen closely
>>and you will see that it is only present with modulation.
> 
> 
> It is not IM.  An excellent discussion concerning the effect you're hearing
> is well-documented on the NU9N web site.  As audio approaches the carrier
> set point in the lower audio octaves, to the ear it sounds like the presence
> of a carrier, but disappears as you tune on-frequency.  Somehow, all
> unexplained things only in the presence of modulation tend to be blamed on
> IM.
> 
> -Paul
> 
> 

How would you explain that "all hi fi SSB stations do not have this 
effect"? On the very clean sounding ones I do not notice it.

73
Gary  K4FMX