Hi,
On 06/18/2017 05:37 PM, Bob kb8tq wrote:
Hi
On Jun 18, 2017, at 11:17 AM, David J Taylor <[email protected]>
wrote:
"David J Taylor" <[email protected]> wrote:
.. or a ready-made, and smaller item:
http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696
I use this successfully for 1.09 GHz ADS-B splitting.
Please be aware that this is a Wilkinson splitter and thus has a DC
path connecting all three ports. You will need to add a DC block
at one of the receivers.
Attila Kinali
=======================================
In practice, what would happen if you didn't have the block?
Say with two identical receivers?
As long as they both are powered up, noting much. If one looses power, it
*might* try to power
up the other one via the antenna feed. With most receivers, even that would
likely just be an
odd occurrence / no damage caused. The fear is that you have a receiver that
*would* be damaged
by the back feed. With eight receivers into a coupler, there *could* be quite a
bit of current available.
As you power up, there can be a bit of a rush-in power.
Lack of isolation can cause antenna power detection to be confused.
Two driving one antenna => too little current => judged as unconnected.
One driving antenna and other GPS => too much current => judged as short
circuit.
If you have different voltages, it might be bad for the low-voltage device.
Cheers,
Magnus
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