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Michael Black[_2_]

On Tue, 11 Mar 2014, wrote:

On Sunday, March 9, 2014 11:30:08 PM UTC-4, Ralph D. wrote:
Hi,

I need a cable (ideally about 20ft), stereo 3.5mm male/male, highly shielded
to connect my audio source to a transmitter across a room. This cable passes
many sources of interference, so the shielding is critical.

I would prefer to get it from Amazon so as to get it quick with Prime
(incredibly narrow window of free-time during a currently very busy
schedule) but would be OK with ordering from one of the Ham sites if
turnaround time is very good. I could not get a good search parameter on
Amazon that didn't turn up thousands of hits that I just don't have time to
sift through right now.

Any good cable with known good isolation would be good. I have ferrite
chokes I can use, but would prefer a cable of suitable quality that did not
need them (current cable is getting interference even with them as this is
not just run-of-the-mill 60cycle stuff).

Hmm, What kind of interference are you seeing? (can you turn things off
and make it go away?) To get rid of electro-static pick-up (display
screeens flourescent lights...) get a cable with both braid and a
almuinized mylar sheild. (Driving the cable with a low impedance source
should help too.)

That's the question most of us missed. I could have sworn he said "rf
interference", but when I looked back after posting, realized he hadn't
indicated any specific bit of interference.

Michael

60 Hz, magnetic interference is darn hard to shield against (In my limited experience.) Your best bet there is to keep a good distance between transfomeres and the cable.

George H.

Any good suggestions would be appreciated.

Thanks!