[time-nuts] WTB: GPS Antenna Splitter

"Björn Gabrielsson" bg at lysator.liu.se
Tue Oct 7 09:04:01 EDT 2014


John,

Note that Mini-Circuits seems to have made lots of other (GPS) splitters
for Lucent and others.

    http://www.ebay.com/itm/Mini-Circuits-3-Way-Power-Splitter-Combiner-ZB3PD1-1575DC1S-/270834416075

--

   Björn

>  Björn,
> Thanks for letting us know - price isn't too bad - gotta love the P/N -
> ZAP
> D - makes you wonder if they have a sense of humor.
>
> Regards,
> John W.
>
>
> *Ordering,Pricing & Availability Information*
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> SheetDescriptionConnector TypeBracket OptionT&RAvailability
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> available as RoHS
> Compliant/Pb Free
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> ZAPD-2DC+ <http://www.minicircuits.com/MCLStore/ModelPriceDisplay#>Data
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> Stock$ 79.95$ 79.95$ 69.95$ 68.95-ZAPD-2DC-S+
> <http://www.minicircuits.com/MCLStore/ModelPriceDisplay#>Data Sheet
> <http://www.minicircuits.com/pdfs/ZAPD-2DC+.pdf>Power Divider, RoHSSMA--In
> Stock$ 74.95$ 74.95$ 64.95$ 63.95-
>
> On Tue, Oct 7, 2014 at 4:43 AM, "Björn Gabrielsson" <bg at lysator.liu.se>
> wrote:
>
>> Hi,
>>
>> For those with a junk basket full of generic splitter/combiners and
>> DC-blocks, go ahead and put something together. Note that most receivers
>> wish to have a DC-load of around 200ohm to not raise antenna fault
>> alarms.
>>
>> I have not found a dedicated GPS splitter cheaper than this from
>> Mini-Circuits
>>
>>     http://217.34.103.131/pdfs/ZAPD-2DC+.pdf
>>
>> When trolling the online auction sites, GPS Source and GPS Networking
>> splitters are often less pricy than the HP/Agilent/Symmetricom/Microsemi
>> ones.
>>
>> --
>>
>>     Björn
>>
>> > Hi:
>> >
>> > This works great and has minimal cost.
>> > http://www.prc68.com/I/4GPS.shtml
>> >
>> > Have Fun,
>> >
>> > Brooke Clarke
>> > http://www.PRC68.com
>> > http://www.end2partygovernment.com/2012Issues.html
>> > http://www.prc68.com/I/DietNutrition.html
>> >
>> > John C. Westmoreland, P.E. wrote:
>> >> Dave,
>> >>
>> >> Can you please let us know what you go with for your splitter choice?
>> >>
>> >> I noticed companies like EndRun Technologies use ones from these
>> folks:
>> >> http://gpsnetworking.com/GPS-antenna-splitters.asp
>> >>
>> >> TESSCO might stock those if you ask them.
>> >>
>> >> Regards,
>> >> John W.
>> >>
>> >>
>> >> On Mon, Oct 6, 2014 at 6:09 PM, Bob Camp <kb8tq at n1k.org> wrote:
>> >>
>> >>> Hi
>> >>>
>> >>> Missed the survey question…
>> >>>
>> >>> If a ns in free air is about 1 foot (30 cm), then you probably want
>> a
>> >>> survey that is better than 6† to keep the error down. You do
>> not want
>> >>> to
>> >>> have the antennas on top of each other, so yes, the GPS will need a
>> >>> survey
>> >>> / location each time you change antennas. If you go with the
>> 10’
>> >>> spacing,
>> >>> then you will get some pretty big jumps without switching the
>> location.
>> >>>
>> >>> Bob
>> >>>
>> >>> On Oct 6, 2014, at 4:01 PM, Dave M <dgminala at mediacombb.net> wrote:
>> >>>
>> >>>> Does anyone in the group have, or can point me to, a low-cost (but
>> not
>> >>>> cheap) 2-port splitter for a GPS antenna?  Those on Ebay are rather
>> >>>> expensive.
>> >>>>
>> >>>> I have two GPSDO units, and have both an older timing antenna and a
>> >>>> new
>> >>>> choke ring antenna (Thanks, Pete L).  I already have one 2-port
>> >>>> splitter
>> >>>> (working well), but my intent is to connect both antennas through
>> the
>> >>>> splitters and a couple coaxial relays so that I can, with the twist
>> of
>> >>>> a
>> >>>> switch, allow me to run each GPS from a different antenna, or both
>> >>>> from
>> >>> the
>> >>>> same antenna.  I would like to gather some data as to the
>> differences
>> >>>> between the two antennas.  I know I could switch the connections
>> >>> manually,
>> >>>> but I like the idea of a switch to sort of automate the
>> connections,
>> >>>> and
>> >>> I'd
>> >>>> need another splitter anyway.
>> >>>>
>> >>>> Before I go to the trouble and expense of building upon this idea,
>> are
>> >>> there
>> >>>> any comments as to the value of the project?
>> >>>> Some questions come to mind:
>> >>>> I'm thinking about mounting both antennas on the same mast, at the
>> >>>> same
>> >>>> elevation, just separated by a couple feet.  Any problems that I
>> >>>> should
>> >>> be
>> >>>> aware of by putting both antennas so close together?  Will that
>> small
>> >>>> distance have a noticeable effect when switching a receiver from
>> one
>> >>> antenna
>> >>>> to the other?  Will the GPS notice the difference and want to do
>> >>>> another
>> >>>> survey?
>> >>>>
>> >>>> Thanks for your comments.
>> >>>> Dave M
>> >>>> _______________________________________________
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