[Elecraft] help with improving transmit eq

[Jim Brown]

On Wed,2/3/2016 10:21 AM, Walter Underwood wrote:
> I seem to remember that the 3-6 dB boost in the top band was to 
> correct for rolloff in analog receive filters. I have no idea where I 
> read that, but it was probably back in the 1970’s.

It's compensating for both TX and RX filters. The first mic I know of 
that provided that compensation was the Shure 440, as far back as the 
'50s. The current model is a 444D. The D104 does much of the same thing. 
Those mics also roll off the low end a bit. Heil's contribution was to 
use exactly that principle in mics that are smaller, or "sexier," or in 
more convenient packages, to advertise them as if they had invented the 
idea, and to raise the price a lot.

73, Jim K9YC