There are two machines on the same tower on these frequencies with
one antenna about 20 feet directly over the other. Each machine is
putting out about 30 - 50 watts. Each machine plays fine by itself,
but as soon as the other tranmitter comes up the problems begin.
Each machine has a different PL required to key up (67 and 77). If
someone unkeys on 146.925 while 147.225 is keyed, the 925 which
encodes a pl seems to get into itself and the 225. The 925
transmitter also causes the same problem on the 225 receiver.
These two are fine as long as the other is not keyed at the same
time. Someone in the group has said that there is a harmonic causing
this and those two repeaters just cannot be co located. I admit I
don't know much about this, but how can a harmonic be causing this if
they are both on VHF? I would think that mixing might possibly be
responsible for this. The BpBr duplexers were just tuned so I don't
think they are the problem. The SWR is flat on both machines as
well. Also, both repeaters are new (1 Hamtronics, 1 Kendecom).
How can I determine if the problem is mixing? If it is mixing, how
can we fix it? Would a "crystal filter" on the receiver help?
Neither of these machines are mine, so I am trying to gather info for
the two affected groups, so thank you for any advice!
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