I disagree on the price of the CDM's. You can get the CDM-750 (4-channel) for as low as $75 to $125 if you watch for them on e-bay. The CDM-1250 and CDM-1550 are more expensive used, but still you should be able to get them for $250 or less if you just have to have the 128 channels and alpha display.
On our setup, I program the RX CDM for PL on receive, but leave it in monitor mode. I then feed the PL detect from the RX radio to the PL encode of the TX CDM. When it gets back to the site, if the radio receives a PL, then it sends the logic out the PL detect pin. If it doesn't, then no logic is sent. This way you can turn the PL tone at all your remote sites locally with your controller. On Thu, Jul 29, 2010 at 3:35 PM, Glenn (Butch) Kanvick <hotl...@gmail.com>wrote: > > > Hello Tim. > > I just looked in my storage site and I found a Micor Base/Repeater which is > on the band split of 402-430 MHz. I do not have channel elements for it. > I know it was working when it came out of service a few years ago, and the > PA can be used as a digital station, as it takes the four pin channel > elements. It is the complete base repeater which is designed for continious > duty as it has the large pa heatsinks. > > Let me know if you would like pictures of it. > I have $200.00 into it and it weighs alot so I am sure shipping via ground > would be around $50.00. > > If you need the cabinet and power supply it would be $400.00 plus actual > shipping. > > > Butch, KE7FEL/r > On Thu, Jul 29, 2010 at 1:33 PM, Tim - WD6AWP <tisaw...@gmail.com> wrote: > >> >> >> Those CDM radios are a bit pricy at $550 each. But I appreciate the >> suggestion. And you've given me some ideas. >> >> I still like the idea of building an out of band repeater for the remote >> receive site from a Micor chassis. I would need a 406-420 exciter, bandpass >> filter and trippler. If anybody on the list has those or can help me find >> them I'd really appreciate it. >> >> --- In Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com>, >> James Adkins <adkins.ja...@...> wrote: >> > >> > I am using the Motorola CDM series of radios for 420-425 MHz links from >> > voting sites. They make a low-split UHF split that covers 403-470 MHz >> out >> > of the box, no mods needed. On the transmit sites, you will want to use >> a >> > fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack >> > shelf, use a 4" hole saw and drill a hole under the UHF TX radio, and >> > purchase a nice Dayton 24vdc fan that is actually a ball bearing fan >> that >> > you can count on for years of use, and let it go. Have not had any >> problems >> > to date with these rigs over a 4 year span. >> > >> > at W6KGBs article on moving 450-470 Mastr IIs >> > >> > > to 420-450. It's on the GE Mastr II page at repeater-builder. >> > > >> > > You could use a Mastr II UHF mobile with the receiver, >> > > exciter and IPA converted to 420, then use the receiver >> > > in an aux receiver chassis at the voter site. >> > > You wouldn't need to convert the PA, the IPA (driver) >> > > and a beam would be enough for a point-to-point link. >> > > >> > > Bob Meister WA1MIK did an article on converting the >> > > multiplier chains so that the UHF Micor receivers could >> > > hear down as low as 435 MHz (where the front ends >> > > run out of tuning range). >> > > >> > > Mike WA6ILQ >> > > >> > > At 05:10 PM 07/27/10, you wrote: >> > > >Thanks Jeff, I'll keep looking around for those low split UHF Micor >> > > >receivers. What about the transmit side? >> > > > >> > > >Maybe I should look for a unified chassis low split UHF repeater. >> > > >Swap out the UHF receiver for a VHF high band receiver and use that >> > > >for my remote receiver site. Then use the low split UHF receiver on >> > > >the other end of the link. >> > > > >> > > >That make sense? >> > > > >> > > >--- In >> > > >Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com> >> <Repeater-Builder%40yahoogroups.com>, >> >> > > "Jeff DePolo" <jd0@> wrote: >> > > > > >> > > > > > When you say low split, are you talking about the Motorola >> > > > > > TRE1201/TRE8031 406-420 Mhz receivers? >> > > > > >> > > > > I don't have a manual in front of me, but yes, 406-420 receivers, >> > > they'll >> > > > > work fine well into the mid 430's without mods. >> > > > > >> > > > > > What Canadian sources might have these? >> > > > > >> > > > > Well, Spantek comes to mind as a dealer. CW Wolfe used to get a >> lot of >> > > > > stuff out of Canada, but I haven't talked to Bud in quite a few >> years, >> > > not >> > > > > sure if he's still in business. This list is probably the best >> > > resource. >> > > > > eBay as an alternative. If you get desperate I still have a few >> dozen >> > > > > low-split Micors in the warehouse, but really don't have the time >> (or >> > > > > patience) to deal with packing and shipping radios for what few >> dollars >> > > I'd >> > > > > get out of them (i.e. value of my time > $value of radio). But if >> you >> > > just >> > > > > wanted a receiver, you can consider me a last resort if you strike >> out >> > > > > everywhere else... >> > > > > >> > > > > --- Jeff WN3A >> > > > > >> > > > > >> > > > > > >> > > > > > --- In >> > > > > > Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com> >> <Repeater-Builder%40yahoogroups.com> >> > > > > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> >> <Repeater-Builder%2540yahoogroups.com>> >> >> > > , "Jeff DePolo" >> > > > > > <jd0@> wrote: >> > > > > > > >> > > > > > > > What is a good radio for building a one way 420 link? The >> > > > > > > > link will be for a remote receiver and will not need to be >> > > > > > > > duplex... RX at the voter and TX at the remote receiver. The >> > > > > > > > link RX has to live on a noisy hill. Thanks for your advice. >> > > > > > > >> > > > > > > My preferences, in no particular order, would be >> > > > > > Micor/SpectraTAC (low >> > > > > > > split), Mastr II ("77" split), and Delta-S (low-split). >> > > > > > MVP/Exec II (again, >> > > > > > > "77" split) would be fine too. All have excellent front >> > > > > > ends. They can be >> > > > > > > found if you look a bit, especially check Canadian sources; >> > > > > > they're not as >> > > > > > > easy to find stateside as 450-470 radios, but they're not >> > > > > > unobtainium >> > > > > > > either. >> > > > > > > >> > > > > > > --- Jeff WN3A >> > > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > >> > > > >> > > > >> > > > >> > > > >> > > >------------------------------------ >> > > > >> > > > >> > > > >> > > >Yahoo! Groups Links >> > > > >> > > > >> > > > >> > > >> > > >> > >> > >> > >> > -- >> > 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) >> > >> >> > > -- 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)
