On 11/18/2023 8:57 PM, Jim Lux wrote:
I was using 31 mix more as an example. The data sheet for the tape or
sheet gives curves for R and X. The big issue is, for HF, you don’t want
the stuff for microwaves (which is what most of them are).
Yes, exactly what I was thinking once you described what worked for you
-- it's a new way of doing what W2DU did with beads 50 years ago.
I’ll see if I can find what we used - we were in the 100kHz -23 MHz
range. We got rolls of stuff that we could wrap our cables with, or put
around holes in the chassis where the wires came through.
That sounds like a shielding failure if the conductor isn't either
bonded or bypassed at the point of exit. I'm sure I'm not the only guy
here old enough to remember feed-through caps! I don't see stuffing the
hole as a solution. I DO see a length of a suitable material forming a
W2DU-style choke.
I should point out that this is a “fix” - people should really design
things that don’t radiate on their wires (other than antennas!) or are
susceptible to signals, or that have nonlinear characteristics.
Right -- like practicing proper shielding of equipment, proper bonding
everywhere.
73, Jim K9YC
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