[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 * 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/
RE: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
Hi, The difference in frequency between the two transmitters is 300 kilohertz. 300 kilohertz is exactly 1/2 of the separation of either machine; 600 kc. While there are methods and equipment that can be purchased to make the two co-exist, my recommendation is to move one of them to another frequency that isn't 600 kc away or a division of it. Kevin Custer Michael Singewald N1PLH 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. 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/
RE: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
At 02:12 PM 4/18/2004 -0400, you wrote: Subject: [Repeater-Builder] Is there a relationship between 147.225 and 146.925? ---Are these standard split repeaters? Assuming so, the 147.225 repeater (output?) places the input at 147.825 How about clarifying the input freqs for these repeaters? Ken 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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
At 02:22 PM 4/18/2004 -0400, you wrote: The difference in frequency between the two transmitters is 300 kilohertz. 300 kilohertz is exactly 1/2 of the separation of either machine; 600 kc. Nice catch :-) -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
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. If you would think about the frequencies you would see why. The output of one is about 900 khz from the other one. This is almost the same as running with no duplexers and split antennas. YOu need a few cavities in each line or more spacing between the antennas. 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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
At 02:38 PM 4/18/2004 -0400, you wrote: Hmmm. Your transmitters are 300 KHz apart. Your duplex split is 600 KHz. Sounds suspicious to me. Not to mention there are all sorts of odd order mixes with his freqs: Third Order Results: 147.2250 MHz + 147.2250 MHz - 146.9250 MHz 147.9250 MHz 400.00 KHz 147.2250 MHz - 146.9250 MHz - 146.9250 MHz 146.3250 MHz 300.00 KHz Fifth Order Results: 147.2250 MHz + 147.2250 MHz + 147.2250 MHz - 147.2250 MHz - 146.9250 MHz 147.9250 MHz 400.00 KHz 147.2250 MHz + 147.2250 MHz + 147.2250 MHz - 146.9250 MHz - 146.9250 MHz 147.9250 MHz 100.00 KHz 147.2250 MHz + 147.2250 MHz - 147.2250 MHz - 146.9250 MHz - 146.9250 MHz 146.3250 MHz 300.00 KHz 147.2250 MHz + 147.2250 MHz + 146.9250 MHz - 146.9250 MHz - 146.9250 MHz 147.9250 MHz 400.00 KHz 147.2250 MHz + 147.2250 MHz - 146.9250 MHz - 146.9250 MHz - 146.9250 MHz 146.3250 MHz 0.00 KHz 147.2250 MHz + 146.9250 MHz - 146.9250 MHz - 146.9250 MHz - 146.9250 MHz 146.3250 MHz 300.00 KHz -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
Re: [Repeater-Builder] Is there a relationship between 147.225 and 146.925?
At 11:46 AM 4/18/2004 -0700, you wrote: Not to mention there are all sorts of odd order mixes with his freqs: ---you guys considered adding circulators to your transmitters? That would solve the mixing issues.. Ken 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/
