Hi Milt and Thanks for the response. Here are the answers to your questions
1) For the two I would really like to use they are about 110' apart vertically. Two of the antennas are mounted on the top of the water tower (within 15' of each other) and the other is on the ground mounted on the equipment building. 2) The ground mounted antenna is a 1/4 wave ground plane. On the top of the water tower is a 6 db vertical (X300 I believe) and a 3 element yagi. At the very top of the water tower is the 440 repeater antenna. I was using the remote bases with the 1/4 and the vertical during the last test. 3) Each remote base radio is an Alinco DR 135. I have the two I was using for the last test set to 5 watts. 4) No extra filtering is in use 5) No, I have no specifically looked for that. 6) No PL squelch is used. They do transmit PL for the given repeater. As I was answering your questions something popped into my head that I forgot to mention in the intial email that may have bearing on an isolation issue. One of the repeaters I would like to link to periodically is also located on the site and the antenna is DB224 style vertical mounted on the water tower about 15' vertical feet from the two remote base antennas on water tower. It is running abut 80 watts. Hmm... Chris W4VX ----- Original Message ----- From: Milt To: Repeater-Builder@yahoogroups.com Sent: Tuesday, December 30, 2008 8:05 AM Subject: Re: [Repeater-Builder] Problem remote base linking of 2 repeaters using CAT 300 DXL controller Chris, To start with you will need to give us much more information, but I think that one possible question that immediatly jumps into my mind is that of isolation between the 2 meter remote bases. As I read your post you have a 440 repeater with three 2 meter radios, all at the same site. I'm assuming that each 2 meter link is set up on a single frequency pair. When you are using only one 2 meter radio everything works OK. When you bring on a second 2 meter radio the system hangs in transmit. My questions to start with would be: 1) How much vertical distance is between the antennas for each of the 2 meter radios? 2) What kind of antennas (omni or beam) on the 2 meter links? 3) What kind of equipment is in use for the 2 meter links? 4) Is there any extra RF filtering in use on any of the 2 meter links? 5) Have you been at the site and tried to listen to the 2 meter radios to see if any of the combinations of transmit and receive cause any of the other link radios to unsquelch? 6) Do the links use carrier squelch or PL? Milt N3LTQ ----- Original Message ----- From: "w4vx_chris" <w...@charter.net> To: <Repeater-Builder@yahoogroups.com> Sent: Monday, December 29, 2008 2:40 PM Subject: [Repeater-Builder] Problem remote base linking of 2 repeaters using CAT 300 DXL controller > Fellow repeater builders, > > I am a relative novice at repeater linking and need some trouble > shooting/system design advice. > > I have a 440 repeater with 3 two meter remote base radios tied > together using the CAT 300 DXL controller with the RLS board. The > remote base radios are tuned to local repeaters that we would like to > link together. Individually, each remote base radio works fine meaning > I can turn it on with via 440 repeater and qso on the target repeater. > Also, another local repeater with a 440 remote base is able to link > the 440 repeater and when I turn on one of the remote base radio and > link in another 2 mtr repeater it works fine (repeater key up and down > like one big repeater). > > The problem arises when I try to use the two or more 2 mtr remote base > radios to link two 2 mtr repeaters together. The system comes up > stays up - never unkeys. Is this a hang time issue? Or is there > something wrong about trying to link two repeaters on two meters with > 2 meter remote bases through a 440 machine - usually folks target the > 440 repeater with a remote base not the other way around? Could it be > a controller setting issue? > > I am really stuck at the moment and I appreciate any thoughts you may > have. It sure would be nice to have these repeaters linked for our > nets and is generally kinda cool if we can pull this off. > > Vexed in Virgina, > > Chris W4VX > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
