[time-nuts] T'bolt antenna lead-in running near HF RF transmitting coax

Mark Spencer mspencer12345 at yahoo.ca
Fri Jan 20 22:17:29 EST 2012


My hf antenna is approx 20 feet from my gps antenna and I've never noticed any issues at 100 watts running rtty.



------------------------------
On Fri, 20 Jan, 2012 9:29 PM EST Chris Albertson wrote:

>On Fri, Jan 20, 2012 at 10:41 AM, James Robbins <jsrobbins at earthlink.net> wrote:
>> Can I safely run the GPS antenna coax
>> through the same hole which would put the coax parallel with and touching
>> the other coax for about 8 inches.  If not, how much separation would be
>> advisable?
>
>In theory there should be no interaction at all between the two lines.
> The coax is not perfect but also the appall run is only 8 inches
>
>The thing to really think about is how far is the GPS antenna from the
>Hf transmitting antenna?   The effect of having the the GPS antenna in
>the near field of a 500W HF transmitter is going to be orders of
>magnitude larger then then 8" parallel
>
>But it is not so bad the Thunderbold is designed to handle "hold over"
>well.  So if your HF transmitter jams the GPS it will do find so long
>as you don't transmit for many hours and days with not break.   I'd be
>a little worried if you were sending digital mode for 8 or 20 hours at
>a time.
>Chris Albertson run.
>
>
>Redondo Beach, California
>
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