[time-nuts] WTB: GPS Antenna Splitter

"Björn Gabrielsson" bg at lysator.liu.se
Tue Oct 7 07:43:58 EDT 2014


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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