[time-nuts] GPS Antenna Feed Line Decision

Mark Spencer mark at alignedsolutions.com
Sun Sep 3 14:13:34 EDT 2017


The last time I looked at upgrading my GPS antenna feed line (I'm currently using RG58 style cable) I spent some time looking at the temperature vs propagation delay characteristics of various cables.

I also picked up a spool of cloned "LMR400 style" cable but ended up using that for my amateur radio hobby.  If I was going to throw more money at my Time Nuts GPS feed line I'd probably look for a "hard line" style cable with a favourable temperature vs propagation delay characteristic.   For a basic installation I expect I would just use RG6 style cable.

Good luck.

Mark S

mark at alignedsolutions.com
604 762 4099

> On Sep 3, 2017, at 9:57 AM, Clay Autery <cautery at montac.com> wrote:
> Thank you for your response.  Again, money is not the issue or
> priority.  Knowing that I am getting the best signal within reason (my
> reason  <wink and grin> )
> Tangentially, you have provided me with the information I require.  As I
> do not know what I will hang off the end of that antenna in the future
> and I am in fact going to be doing some measurement/experimentation, I
> will use something better than RG-59 or RG-6 (even if it is only
> "better" in my opinion).
> I am an incurable over-engineer... and this IS "Time NUTS" after all. 
> <smile>
> Thank to you AND to ALL who have made recommendations thusfar....
> especially the ones with whom I disagree.  Those are the recommendations
> that keep me from completely abandoning rational decision-making.  <big
> grin>
> 73,
> ______________________
> Clay Autery, KY5G
> MONTAC Enterprises
> (318) 518-1389
>> On 9/2/2017 3:27 PM, Mark Sims wrote:
>> Cheap RG-59 cable coax is more than sufficient for 50 .. 150+ feet (unless you are doing geodetic level GPS work).  It is recommended by several GPSDO makers.  The 50/75 ohm mismatch is not an issue.  No need to waste money on fancy pants artisanal luxury coax.
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