[time-nuts] GPS Antenna Feed Line Decision

Bob kb8tq kb8tq at n1k.org
Mon Sep 4 09:37:35 EDT 2017


If you are running into a TBolt, it’s got an F connector and 75 ohm cable
spec’d already …. The 50 ohm / 75 ohm thing didn’t seem to bother 
Trimble. They certainly looked at it before going that way ….


> On Sep 4, 2017, at 12:31 AM, Ian Stirling <is at opus131.com> wrote:
> On 09/02/2017 02:57 PM, Clay Autery wrote:
>> Having decision-making problems for the materials for my GPS main
>> feedline.  Going to use a TM LMR stock, just can't decide how big to go
>> with it...
>  I have a modest 26dB antenna on a six feet pole of plastic piping, the piping is
> strapped to my deck post. The antenna is probably ten feet high added to my deck.
> I use a 40' RG6 that my Comcast chap overestimated, and he said, "Just use it as you need."
> I measured the theoretical 1.4 SWR with as pretty much dead on. So long as my GPS boxes
> agree with consumer time, as measured by the cheap "atomic" clocks from super cheap vendors,
> I am happy with the set up. I have no need of phase and jitter, so long as they average out.
>  I just had to buy some "F" connectors and use adapters to convert to the GPS 50 ohm inputs.
> Works like a charm. And good enough for me.
> Best wishes,
> Ian, G4ICV, AB2GR
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