Daron, I will tell you what I know about analog simulcast systems. There is basically two manufactures of this equipment, Motorola and Quintron/Glenayre. If you want it to be a fairly good sounding system stay away from Motorola equipment. I worked in paging back when there was still a lot of analog pagers on the air, half our systems were Motorola, the other half Quintron. We finally gave up on the Motorola systems running analog, you could set them one day and they may work OK but the next day they would not. There is a problem how the built their FSK modulators, they were not matched like Quintron's. The Quintron modulators were matched to .2 of a dB between them, Motorola did no matching.
The trick that will help the most with either system is; try and keep the overlaps where people will not be using the system. There is other problems with Motorola's simulcast system but that is what kept them from having a good (as possible) running simulcast system. There is still a company in Quincy Il. that sells the Quintron (now Glenayre) line, their company name is ISC Technologies. They have the manufacturing rights for most of the Quintron/Glenayre line or they may have some used equipment available. Paul -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of JOHN MACKEY Sent: Tuesday, May 03, 2005 2:00 AM To: [email protected] Subject: Re: [Repeater-Builder] voting receivers with simulcast transmitters Daron- Most all your 150 MHz or 900 MHz paging systems are going to be simulcast. If there are any 150 MHz analog paging systems around, try listening to them. ------ Original Message ------ Received: Tue, 03 May 2005 01:26:06 AM CDT From: "Daron Wilson" <[EMAIL PROTECTED]> To: <[email protected]> Subject: [Repeater-Builder] voting receivers with simulcast transmitters > Hello Folks, > > I'm looking over a radio study done by consultants for our small coastal > community. The recommendation includes three simulcast repeaters with > voting receivers. We live on the coast, the terrain is covered with tall > trees that make wonderful reflectors and contribute tons of multipath when > wet, and it rains plenty. I can't think of any place with terrain issues > where I have seen a simulcast VHF repeater system built out. > > If you have any references (for or against) a simulcast system like this, > please drop me a note. I suspect a fair amount of multipath problems and > not real great audio for the mobile units based on their location, but I > wouldn't be able to prove it until the thing got installed. > > Ideas? > > Thanks, > > [EMAIL PROTECTED] > Daron > > > > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of Doug Bade > Sent: Friday, April 29, 2005 7:56 AM > To: [email protected] > Subject: Re: [Repeater-Builder] I'm stunned... > > It uses what looks like a JFET type VCO oscillator running with a > dc controlled/varicap pll on board. I used it to replace a 17.6125 > reference oscillator on a synthesized 900 station. The output is multiplied > in this case and used to sync lock a free running 70.45 RX L.O injection > oscillator and is the clock reference for the TX exciter PLL. I used an > outboard 10 mhz ovenized oscillator to set it up and it was tuned up as a > special from the vendor on our requested freq. > > It is likely not 2ppm itself, but in a stable environment it may > be ok without an ovenized reference. It can use about any reference that is > compatible with the programming. It has no mod port as it is more designed > to replace a crystal than replace the channel element. The RX performance > of the station after the mod was slightly lower with this unit as opposed > to my service monitor generating the 17.6125 in other tests. I guess that > means it does exhibit some sideband noise which influenced operation but > the spec sheet and printouts that come with it indicate pretty decent > specs.. at least for a pll/vco. > > Not an answer for all but a very interesting development for ham > use etc.... maybe an answer for some.. It also only does 1 freq at a time... > > Doug > KD8B > > > At 07:14 PM 4/28/2005, you wrote: > >Certainly would be nice to put one through it's paces on a repeater. > >Checking it for temperature stability and purity, etc. Obviously someone > >would need to have some decent test equipment to conduct the testing. > > > >Chuck > >WB2EDV > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > 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/
