Simon;
Similar things are commonly done by some of the SO2R guys. Most use
separate antennas with bandpass filters in the antenna path. Both
radios need BPFs to protect the receivers. I have seen contesters use
a single antenna (say a tribander) for the antenna and feed both
radios to it. In this case all isolation is coming from the bandpass
filters. This is not common at high power, but should be doable at
low power (100-200 watts). One of the keys is to make sure the
transmitter never gets near the receive frequency, as this happens
the isolation provided by the bandpass filters goes away, as does the
receiver front end.
So, in summary, you have to make sure there is isolation between the
TX and RX, you have to make sure they are separated in frequency as
much as possible to help the isolation, and you have pray that
neither of the two things above ever happens incorrectly.
It is MUCH easier to do all this with separate antennas. It is also
much easier to do it at very low power levels. Obviously you have a
need to do things this way. When you accomplish it, I really hope you
will write up an article about it to help the rest of us know.
As a suggestion, you might want to go through the QEX and NCJ
archives (I think they are both available at ARRL.com) to see if
there are any prior articles. This is probably something that has
been covered at one time or another.
GL & 73!
On Feb 20, 2008, at 2:34 AM, Simon Brown (HB9DRV) wrote:
Assume you have many radios and effectively one antenna (in
practice up to 3 at times). You would only transmit with one radio,
the others being used as high-class receivers, spares etc.
How would you route the antenna?
What I want to avoid is transmitting into a receiver by accident if
the software decides that it would be good to switch to TX.
FWIW I am looking at two K3, one TS-480SAT. I would like to receive
on all three simultaneously and transmit with either a K3 or
TS-480SAT.
Simon Brown, HB9DRV
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