[time-nuts] Spring cleaning and antenna placement
Peter Putnam
pico.2008 at sbcglobal.net
Mon Apr 13 19:55:01 UTC 2009
Magnus,
If you replace your RG-58 with RG-6 TV coax, your loss issues will
disappear. The difference in impedance (75 ohms instead of 50) is not
enough to cause problems. Adapters to the pre-fitted F connectors are
readily available. And it's not expensive.
Regards,
Peter
Magnus Danielson wrote:
Joseph M Gwinn skrev:
[1]time-nuts-bounces at febo.com wrote on 04/13/2009 11:32:48 AM:
[2]brooke at pacific.net skrev:
Hi Magnus:
Why not just put the GPS antenna at the top of the existing TV mast?
[3]http://www.prc68.com/I/Ant.shtml#SBant
It would be a little bit of a challenge... I think I have some 4-5 meter
of additional height, the tiling is slippery and then antenna rig is
kind of heavy, so it is not one of those things you do alone. At least I
don't do it alone... I'm not a well trained radio amateur and the
rooftop is not very well suited for elaborate exercises...
I sure would like to have things like safety-line when working up there.
I don't feel that safe up there.
I don't know what it costs in Sweden, but in the US one can hire roofers
or antenna installers to do such things, and they have the equipment.
How did the TV mast get on the roof?
A professional TV mast rigger did the job.
I had a look at it again... and I'd say it is more like 3 meters up from
the chimney, but it is still 4 m up from the roof at the chimney so it
is a bit hard to get to.
Anyway, the repositioned antenna now makes the borrowed Ashtech Z-12
lock up at L1 and L2 for sufficient amount of sats, but the S/N is
lowish, which I think I will blame on my RG-58, not too professionally
done coax work... could TDR it thought. Hmm... why didn't I think of that?
Cheers,
Magnus
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References
1. mailto:time-nuts-bounces at febo.com
2. mailto:brooke at pacific.net
3. http://www.prc68.com/I/Ant.shtml#SBant
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