On 6/29/2013 11:35 AM, Graham wrote:
I find my self in need of either splitting a current GPS antenna feed
or putting up yet another antenna, I would prefer splitting the
current feed.
There are a few options one of which is a Mini Circuits ZAPD-2DC+
splitter/combiner whose data sheet specifically states DC pass through
from one port to the combined port. Fair enough, this should work very
well.
However, there is another model, the ZAPD-2-N (having type N
connectors) whose data sheet states neither DC feed through or not, in
other words, it is does not say explicitly that it does or doesn't.
I think the ZAPD-2-N splitter would work to split the antenna but I am
sure about being able to feed the antenna through this
splitter/combiner and was hoping someone could state yay or nay on
that point.
Graham, back in the past before I got the 8 way -hp- splitter I now use,
I used an MCL ZAPD-2 (SMA connectors) for feeding two GPS receivers, and
it worked very well. I left one port intact to feed DC to the antenna
from that receiver, and put a small cap in series with the other to
block that one. As the second gps connected to that port then
complained I added a 220 Ohm R in series with a small choke to ground
which lets that receiver think it is powering an antenna.
Unmodified, there is a DC connection between all three ports which I
think would not be a good idea for two receivers both looking for a
powered antenna.
If you can find one of these splitters cheaply, it's a very good way to
go, but I wouldn't want to pay the new price for one :^)
Dan
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