On 04/18/2013 09:23 AM, Hal Murray wrote:
[email protected] said:
Oh I know it can handle it, I was trying to avoid a nice 10MHz signal on an
unshielded conductor smack on the Amateur Radio 30m band :) It's more RF
here than Time/Frequency, and if I can avoid clashes, so much the better...
Has anybody measured the radiation from various types of coax and/or twisted
pairs?
It would be interesting to see how they compare and/or how they compare to
things like unterminated unused outputs or emissions from gear with the lid
off and things like that.
In my experience, unshielded twisted pair ethernet cables are
quite noisy. The inexpensive coax used for ethernet leaks
enough that the 10 MHz from my Thunderbolt wiped out WWV
on 10 MHz.
I replaced the cheap coax with instrumentation grade cables
and WWV reception is much better.
I replaced all the ethernet cables with shielded cables and the
RFI and EMC problems pretty much disappeared.
--
Chuck Forsberg WA7KGX [email protected] www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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