[Background] Well I've found a used F3K to purchase and it's on the way.
While I'm waiting I thought I would do some reading.
I came across sever inquires about RFI/EMI interference.
Seems like most are using the clip on type ferrite beads.
So looking at one of my current USB connectors I see two different
ferrites - one on each end. First one is approximately 2" long and ¾" diameter.
Second on is 1" x ½". I also notice that on the first one the outer insulator
is trimmed so that the ferrite core makes direct contact with the shield.
The second one just mounts around the outer insulator.
[Question] So my question is which is better, mounted on the shield or
insulator?
Or does it just depend on the inside diameter of the ferrite?
[Background] My decision to purchase a F3K type radio was based on some
modifications
I did for a friend. My friend uses a Ten Tec Orion 1, which I modified to
include a
buffer amplifier for the IF and a LP-Pan adapter. This combination is what got
me started using PowerSDR. In doing so I used a Astron SS-30M (unlighted
meters)
and Astron SS-30M (lighted meters) as a supply for the Orion. While using
both power
supply's I noticed a background signal that would start on the high end of the
display and
move slowly down the frequency. From what I can find out this is a known
problem
with this power supply(s).
[Question] Is there a way to fix this or would I be better off just going back
to a leaner supply?
tnx
Don
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