We are using Motorola CDM-750's for our sites. Mount both radios to a 1U 19" rack shelf, and using a 4" hole saw, cut a hole below the TX radio and mount a 4" Dayton 24vdc fan, they run forever!
We simply use the Motorola R.I.C.K. for our "controller" so to speak. Simple and reliable. With the flexibility of the CDM's, we program them for ignitiion sense & on/of switch so they come back on automatically after a power outage. We can also use the controller at the central site to turn off the requirement for PL at all remote sites with one simple command. Simply program one pin for PL & CSQ Detect on the receive radio. Program your radio for PL tone receive only, then leave the radio in monitor mode (yes, if you lose power it will come back up in monitor mode). This way the site hears all traffic, PL or no PL. Then, program the TX radio so that a pin controls the PL encode and feed the PL & CSQ detect into the PL encode control pin. The link radio will TX a PL if a PL is received, and will not if none is received. Back at the site, program your receive radios the same way as your receive radio at the site. Then you can feed your CSQ & PL detects from your sites into an or logic switch so that if it receives a PL from any site, it sends a single PL to the controller. We ended up using the 420.xxx and 425.xxx link frequencies, though, to try to alleviate any interference. The CDM radios (if you get the right one) will do 403-470 MHz without a problem, no mods needed. So far we've been using these for about 4 years with no problems whatsoever. On Fri, Jan 8, 2010 at 6:21 AM, Mike DeWaele <mdewa...@seneca24.net> wrote: > > > I've used GE mastr 2. swap out UHF receive section with a VHF receiver. > Duplex radio and your all set. Lots of guys do this for split site 6 meter > repeaters. I think you can find that info on the repeater-builder website > some where. > > Mike KA2NDW > > > -----Original Message----- > *From:* Repeater-Builder@yahoogroups.com [mailto: > repeater-buil...@yahoogroups.com]*on Behalf Of *John Szwarc > *Sent:* Thursday, January 07, 2010 10:26 PM > *To:* Repeater-Builder@yahoogroups.com > *Subject:* [Repeater-Builder] Remote Receiver site > > > > I’m looking for some advice on constructing a remote receiver site. > Ideally I’d like to have everything contained in one neat package just like > at the repeater site. We’d be receiving on VHF and transmitting the link > signal on UHF back to the repeater site. Any thoughts? > > > -- James Adkins, KB0NHX Vice-President -- Nixa Amateur Radio Club, Inc. (KC0LUN) www.nixahams.net Southern Missouri Assistant Frequency Coordinator - Missouri Repeater Council www.missourirepeater.org The Nixa Amateur Radio Club - "There is no charge for awesomeness!" (Well, only $1.00 per month)
