[Elecraft] K6SE Sprint Summary for Team Elecraft

[k6se@juno.com]

George, W5YR wrote:

"...I have a feeling that ARRL is going to have to start measuring a
number of additional aspects of modern radio performance, such as filter
blowby where crystal filters are used."
==========
I wasn't aware that any other modern radios had this problem, but it
certainly is possible.

The only other radio that I owned that had xtal filter bleedthrough was a
new Drake R-4C I bought in the early '70s.  I added a lot of shielding to
the receiver, but I was never able to completely get rid of the
bleedthrough.

I now know that one of the Sherwood mods (installation of the 600 Hz 1st
IF xtal filter) took care of the R-4C bleedthrough problem. 
Unfortunately, I never did that mod.  The radio was sold long ago and I
understand that the new owner incorporated all of the Sherwood mods.

With the Sherwood mods, the old Drake R-4C is rated as the best receiver
in the field today -- even better than the K2 on IMDDR3 and BDR figures. 
Many of them are still in use today by topband DXers.

No, ARRL labs did not review the R-4C with Sherwood mods, however INRAD
published figures for its tests on the Sherwood R-4C compared to its
tests on modern radios.

73, de Earl, K6SE