[time-nuts] GPS Antenna

[J. L. Trantham]

Chris,

There are several Symmetricom splitters available, including 1:2 and 1:4
that can be had, on occasion, 'on the Bay' that work well with the TBolt,
although I use one of the 1:4 units with a TBolt, a Z3816A, a Z3805A, and
that leaves a 'spare' for any other project I am working on, that requires
both the TBolt and a Z3816A powered on to function normally.  The ones I use
are the 58535A and the 58536A.  There are several listed now, including this
one 350426342961 (no connection to the seller).

IIRCC, someone on the list had offered some for sale at very reasonable
prices in the past.  Perhaps he is 'listening' or you can find him by
searching the archives.

I have my antenna (like this one 290469118397 no connection to seller except
a satisfied customer for other items) mounted on the corner of my workshop,
lower than the rest of the house, under some trees (not the best location by
any means) but out of the way of the lightning here in FL and it feeds the
splitter (no lightning protection) which feeds the receivers and works well.
I have not performed any 'formal' measurements of the stability of the 10
MHz or 1 PPS signals though.  That's on one of my many 'back burners'.

Hope this helps and good luck.

Happy New Year to you and all on the list.  Thanks again to all on the list
for all your help to me in the past.

Joe



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, December 30, 2010 5:26 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] GPS Antenna


A few questions about GPS antenna....


1) I read the Thunderbolt user manual and did not find any meaningful spec
on the antenna except that it is amplified and uses DC power in
the coax.  What signal level is the Thunderbolt expecting?   oes it
want a 24dB antenna or more or much less?

2) I want to feed two GPS units with one roof mounted antenna.  I figure
that splitters are just a transformers and will not pass DC to power the
antenna.  There must be an easy way around this.

3) Do people really run coax straight from a GPS antenna into their house
with no protection from lightening?  Maybe a GPS antenna is a small target
compared to a 100 foot wire antenna in Florida

-- 
=====
Chris Albertson
Redondo Beach, California

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