Sounds like front-end overload to me. Just my humble opinion. Pete
-----Original Message----- From: Michael Singewald N1PLH [mailto:[EMAIL PROTECTED] Sent: Sunday, April 18, 2004 2:04 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Is there a relationship between 147.225 and 146.925? 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/
