The band we are using is the 450-500mhz band even though some of our sites are .2 meg from each other The link system is 3-10 meg different from the central station e.g. Central is 473.575 ,S1 is 473.200,S3 is 473.475,S4 is 474.150,S5 is 470.450 and the link radios are 487.025 giving up to 8-10 meg seperation from link to repeaters .With our open we ran into problems with seperation linking the sites that is why we setup a second repeater on the central site and paired them i.e. 473.575 and 487.025 and that allows the other sites to be linked all using 487.025. We had 3 of the licences in place before we realized the error and then had to improvise With the private system we are at 483.900 and 489.1mhz and expect to setup our private remote sites with more than 3 meg away from 489.1 which means we don't require the second link repeater on the central site which should simply things I haven't had any experience with audio delays but what we do is we advise the clients to hold their TX down for a second or so and then speak and that overcomes the first words from being chopped off through the other sites .If they follow that rule we can hear everyone perfectly. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 www.kerinvalecomaudio.com.au -------Original Message------- From: skipp025 Date: 5/01/2008 7:31:41 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Linking two shared repeaters > "Kerincom" <[EMAIL PROTECTED]> wrote: > Thanks skipp. > I was looking at only linking two repeaters together but if I > can successfully link two or more with no problems then it > would be great to expand our private system to allow my clients > even more coverage as long as privacy can be maintained.
My first post was the more practical way to link two sights using one half duplex link radio. > With our current private repeater we use a tp-163 panel with > two maxon pm150 and we hope to use the same or a tp-154 on > our second site. I have many of both in operation... although I'm a bigger fan of the TP-163 tone panel. > I think in the end of your email the two radios back to back . > We tried having two radios b2b at a separate site in between > the two sites we wanted to link and yes it worked ok but we > ran into a) desence if the power output was to high on either > radio and we were using 6-10db yagis aimed at each site to > give us seperation but we still ran into problems .I think the > max power output was around 150mw before problems started . In band linking can be tricky. Space the frequencies as far as possible. I use a generous amount of filtering on the repeater and the link radio. > B)bad time delays up to a second or so because each radio had > to turn on in time . One trick is to place audio delays in the proper places to allow the links to power up before the content is passed. > With our current system we have no delays to complain about. > It doesn't matter which site someone talks on, each of the > other repeater sites turns on at the same time. I'm also doing the same... > I do have one site that carn't communicate very well with > the central station and is linked to one of the other sites You can have more than one central linking chain station. > and yes we do have a 1- 2 second delay on it which we hope > to clear that up soon and get it to work direct with the > central station. The previously mentioned audio delays properly placed might fix the problem without all the extra work... just the expense of the delay boards and the time to install them. > With the link reception from the central station we have found > that we require all the remote sites to have their frequencies > to be more than 3 meg away as desence can occur on receiving > the signal from the central station if it is weak and we have > tried a old diplexer inline with yagi and the link radio to > notch the remote sites transmitter so the link radio > receives the central site with no desence which works > Perfectly. Am doing same... I don't remember you saying which band you were operating and linking with... but I've done about every possible combination and we're always happy to share the details. The in-band linking and repeater requires proper filtering and frequency spacing to work... but it can and does work well. > Thank You, > Ian Wells, > Kerinvale Comaudio, > 361 Camboon Road.Biloela.4715 > www.kerinvalecomaudio.com.au Cheers Ian, s.
