On 3/15/2015 5:50 AM, Brian Reay wrote:
Tom W3TDH wrote:


Would you please advise if the third harmonic issue is likely to be
serious enough to require the use of a low pass filter between the two
meter transceiver and the Diplexer/Band Pass Filter when using separate transmitters?


It depends on your tx.

I've never required filters nor heard of their being required.

Remember, you would need to be listening on the 3rd Rx harmonic, or 'close'
to it for the rx to suffer and the harmonic should get several 10s of dB
down relative to tell 2m carrier.


Brian,

Yes, it will be several 10s of dB down - but that can still be
sufficient to be heard in (and potentially desense) a near-by receiver.
It doesn't take a lot of signal if it's within the receiver's passband.

But Tom's diplexer should handle this easily.

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