[Elecraft] Location, location

[Jim Brown]

On 9/6/2012 4:48 PM, N2TK, Tony wrote:
> For some reason the Line-In was
> at maximum. I was getting hum on my transmit audio

The problem is that the transformers are unshielded (and un-needed, but 
that's another discussion), and unshielded transformers are sitting 
ducks for magnetic fields.  The simplest solution is to roll off the low 
end using TXEQ, which is a good move anyway.  Most of the what comes 
through a mic picking up speech below about 150 Hz is breath pop, 
handling noise, and room noise, and nothing below about 400 Hz 
contributes to speech intelligibility.  So a smart operator will use 
TXEQ to kill everything below about 300-400 Hz.  TXEQ makes that easy, 
and it kills the hum picked up by the transformer.

73, Jim K9YC