[time-nuts] Splitting GPS antenna output

Brian Kirby kilodelta4foxmike at gmail.com
Wed Sep 2 22:36:08 UTC 2009

I use to use splitters that were rated for satellite dishes (Like 
directtv and dish).  They down convert to 900-1.5 Mhz and they also pass DC.

As time went on and we time nuts strive to do it right, I switched to 
Mini-circuits splitters and bias tee's. 

If any of you need it, MiniCircuits ran group delay test on their 
ZA4PD-2S splitters for me.  The document is about 70 some odd pages.

Brian Kirby - KD4FM

Dan Rae wrote:
> Keep an eye open at swap meets etc., or even eBay, for something like 
> an MCL ZAPD-2,
> http://www.minicircuits.com/pdfs/ZAPD-2+.pdf
> which is a 1 to 2 GHz splitter.  It has DC continuity from 1 and 2 to 
> the common.  I put a 100 pF blocking cap in one of the ports, the 
> other feeds DC to the antenna.  An R and choke could be fitted if the 
> receiver connected to the isolated port complains.
> I used one of these for years when I only had two gps units; now a 
> lucky find of one of the 8 way -hp- splitters serves me well, and 
> still has one or two empty ports...   -hp- did make a four way one but 
> not I think, a two way.
> Incidentally these things and similar are very useful just as boxes 
> with SMA sockets, for the usual $1 or so they fetch at swap meets, 
> they are well worth grabbing.
> Dan
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