[time-nuts] GPS Antenna Feed Line Decision
Mike Naruta AA8K
aa8k at comcast.net
Sat Sep 2 19:07:40 EDT 2017
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...
> 26 dB 5vdc antenna on top of a 38 foot mast. Feed will come down the
> inside/center of mast and exit near the bottom, thence routed through a
> window and to the GPS distro amp. Antenna will feed GPSDO, NTP Server,
> Blitzortung System Blue station, and one other device TBD.
> I'd appreciate your recommendation and reasoning. Thanks in advance!
Clay, you may wish to consider using a quality RG-6 with F
connectors. Grounding blocks are readily available for the base
of your mast and the entrance to your house. Also,
off-the-shelf over-voltage protectors (Zap-Tech) are available.
I even found an F-to-N adapter for the antenna on Amazon. Watch
out for the ones with metric N threads though.
For my 25 meter run I was going to use an existing one inch
Heliax, but pulled a run of Belden RG-6 instead after learning
that Trimble used RG-6.
It worked well directly connected to a Trimble Thunderbolt; now
it is connected to a Symmetricon 58535A GPS L1 distribution
My Blitzortung System Red station has been running fine in my
attic (Michigan) on a Motorola 97 Oncore patch antenna fastened
against the roof underside. It is looking through wood,
shingles, and nails (and a tree and antennas and utility lines).
How are you planning to do strain-relief on the vertical run of
coax inside of your mast?
Mike - AA8K
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