[time-nuts] Remote GPS Oscillator Steering

[Chuck Forsberg WA7KGX N2469R]

On 04/18/2013 09:23 AM, Hal Murray wrote:
> iain at g7iii.net 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   caf at omen.com   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