[time-nuts] GPS Antenna

[paul swed]

Definately nice ways to go. However if this is a hobby then TV RF splitters
and satellite LNB IF line amps (LNBs IFs are .9-1.5 Ghz) also work very
well. I picked up the line drivers for $2 at a typical old stock store and
splitters to 2 Ghz for $1. Measured them and they are pretty good. But the
real test is inline and every thing seems to work well. I have 3-4 rcvrs
hooked up.
Regards
Paul
WB8TSL

On Thu, Dec 30, 2010 at 10:45 PM, J. L. Trantham <jltran at att.net> wrote:

> 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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