[Elecraft] Buryflex all the way to K3?

[Tom W8JI]

> One thought. If you're going to operate SO2R and run 
> power, you should
> probably use the bigger coax for the jumper, because the 
> more robust shield
> can help interstation crosstalk. I did that in my shack 
> for that reason, and
> it made a difference.


I'd be very surprised if that had anything to do with 
shielding Jim.

Try this experiment if you have a network analyzer and an 
amplifier. take 30 feet of RG8X and wrap it tightly against 
another cable, but treat the ends properly. Terminate the 
amplifier end and measure cross talk signal on the other 
with the opposite end terminated.

You'll measure virtually no crosstalk, certainly much less 
than -80 dB, with nearly any cable. Even very crappy Radio 
Shack cable that you can see through the braid is 
surprisingly good.

After making dozens of measurements here, I concluded the 
major problems I had were from antennas coupling to antennas 
(even at 1000 foot spacing) and how connectors were mounted 
on radios and amplifiers, and things like BNC and phono 
connectors.

I need to expand this page, but here is some actual data 
comparing coupling at 1/2 mile between antenna to ingress 
through the shield of one type cable.

I think we far overestimate shield ingress. The real problem 
is poor connector mounting and grounding.  (Sound familiar?)

We use RG8X no problems, but I have cleaned up the grounding 
of connectors on all my RF equipment and panels.

73 Tom