[Elecraft] K3 + Heil HC 5 element

[Jim Brown]

On 3/28/2012 9:35 AM, Joe Subich, W4TV wrote:
> When I had the Proset with HC-5 element I used almost the same TX EQ as
> I currently use with the CM-400 - just a bit less preemphasis at the
> high end.

FWIW -- I've never found the need for ANY high frequency pre-emphasis 
with my CM500s (I own two), nor with any of those I've helped local hams 
tweak on the air, but I've seen anecdotal reports from a FEW hams who 
used them who DID need it.  I thus suspect that there may be tolerance 
variations in the response of the mic capsules used.

High frequency pre-emphasis (boosting the top two bands)  IS required 
when professional mics are used with any ham rig.  An important rule 
with ANY boost EQ should be done VERY carefully, and with careful 
listening to the result. The reason is that boost EQ can cause a gain 
stage to be driven into clip when it otherwise might not be.

The settings I generally recommend for ANY mic with a K3 are maximum cut 
in the two lowest bands, something between 6dB cut and full cut in the 
third band (200 Hz), and everything else set to zero, then have someone 
listen critically with their receive IF set very wide.

73, Jim K9YC