Jim,
The most important factor when talking about connecting multiple
transceivers to antennas is isolation.
The real question is just how much RF energy will leak back into the
non-transmit transceiver.
Yes, there is the possibility of damage to the receiving circuits and
T/R switch of the receive transceive that is just supposed to be
listening if it gets too much RF at its receive input.
That is what the real discussion is all about. The amount of isolation
required in the switch depends on the power level. If you are talking
about 100 watts power from the transmitter, 40 dB isolation is likely
OK, but at higher powers, you will need more isolation.
73,
Don W3FPR
On 1/2/2017 9:53 PM, Jim Miller wrote:
Off topic. Sorry. What are the functional disadvantages that make it
apparently undesirable to build an antenna switch that is a crossover 2
radios x 2 antennas? What if you only used one path at a time but could
switch them easily? Crosstalk? Is it so strong as to damage the other
radio? Is it not possible to achieve acceptable compatibility with 2 radios
and 2 antennas? Or to swap amplifiers between two radios and two antennas
by placing one on the input and another on the output of the amplifiers? Or
to swap in the better antenna for a short contact that you just can't seem
to make on the current one?
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