I wonder if anyone using the high-out low-in method considered the
intermod concerns from having two high power transmitters 'beside' each
other while the receivers are on the 'ends'. Not only would the mixing
put both TXs on your receiver, but it would put it on the
commercial/public safety repeater inputs as well! It's much easier to
notch out a nearby transmitter than notch out an on-frequency mixing
product created who-knows-where.
Let's face it - this same problem exists in the commercial band as well
- 460 MHz TXs beside 459 MHz RXs, and 470 MHz TXs beside 469 MHz RXs.
Now, you want to turn the ham repeaters upside down which will really
screw up the current balance. As it stands with everything right side
up, most mixing products will all be on repeater outputs rather than
inputs (except for 473-475 MHz, but that would be the products from the
450 and 460 MHz TXs mixing, not the ham TXs).
At the same time, you are ensuring that most ham mixes will be two
commercial/PS repeater TXs or ham-to-ham. (either one much easier to
fix)
Sure, add a third product and you could have problems nearly anywhere,
but 2A-1B and 2B-1A is the most common mixing problem. It's best to keep
'our' repeaters out of other repeaters to minimize the exposure.
As I said before, the New England panhandle (down to MD) has an
every-other-pair-inverted bandplan on UHF (real fun during band openings
when repeaters lock up with each other). I understand that was done to
minimize adjacent channel interference, but now where do you put the
splinter repeaters? They are going to be 12.5 kHz away from a repeater
on one side and 12.5 kHz away from an upside-down repeater on the other.
Joe M.
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