Hmmm. Your transmitters are 300 KHz apart. Your duplex split is 600
KHz. Sounds suspicious to me.
My friend KA1OKQ runs a 146.94 and 147.225 on the same tower. No
problems. All MASTR II. But those pairs are enough different from yours
to make all the difference.
Jeff
At 02:04 PM 4/18/2004, you wrote:
>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!
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
