When I first got started using GPS timing receivers, I used direct
broadcasting satellite cable splitters. They are designed to pass DC,
and usually good to 1.5 to 2 Ghz.
If you need amplification you can also use DBS inline amplifiers - but
they need 12-18 volts to power them - so you would have to use a couple
of bias tee's, one for amplifier power and another in front of the
amplifier to provide antenna power (a lot are 5 volts - you need to
check this).
Symmetricom made splitters that also amplified the signal, and use the
voltage from the GPS receiver to power it. You can usually see a 2 port
version of this for under $50 on flea-bay. There are also 4 port
versions. These are called active GPS splitters. The amplification is
enough to get over the splitter loss and usually no more - so you have
to have a good signal to them.
Arthur Dent wrote:
Dan Rae-"When I only had two gps units in the dim and distant past, I
used a passive splitter made from a Minicircuits (MCL) ZAPD-2 unit bought
at the swap meet for $1, with a 100 pF series blocking cap in one of the
output ports. If the receiver connected to the other port complains,
you can add some resistance to ground to fool it."
While a resistive splitter with one capacitively coupled output will
work fine, You can insert a simple "T" in series with the GPS that
will supply the power and the antenna. Then feed the other leg of the
"T" through a capacitor (with a 220-330 ohm resistor to ground) to the
second receiver-amounts to about the same thing as the splitter. Almost
any value capacitor around 47-100pf should work. This will at least
let you run both GPSDOs until you can find a better splitter/amp at a
reasonable price.
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