To work well, you will need more than 'a few Hz' stability. Even 1/2 Hz is very noticable and annoying.
Joe M. Thomas Oliver wrote: > > You will need the three transmitters to have uhso (high stab oscilators) to > keep them within a few hz of each other, you will have to delay the audio > so all three transmitters transmit the audio at the same time. I do not > know what effect the multipath from buildings will have on the recieved > signal. I think it is worth a shot. > > tom n8ies > > > [Original Message] > > From: Daron Wilson <[EMAIL PROTECTED]> > > To: <[email protected]> > > Date: 5/3/2005 8:47:55 PM > > Subject: RE: [Repeater-Builder] voting receivers with simulcast > transmitters > > > > > > > > I guess I wasn't clear enough. I'm familiar with the simulcast paging, > this > > is not paging. This is public safety police analog repeaters. The > proposal > > is to put three in a row down the town, about 3-4 miles apart, voting > > receivers at the two south ones linked back to the 'main' site via UHF > > control links and a voting controller there. So, they would vote the best > > receiver and simulcast the output of all three repeaters. Not paging, I > > know how paging works, I have a VHF pager on a simulcast system. What I'm > > looking for is somone who has seen an installation like this or has > > experience with it. Personally, I think it will multipath like crazy and > > the recovered audio will be crappy. But, if it is a good thing as > suggested > > in the recommendation, there must be operating systems out there to listen > > to. > > > > Thanks, > > > > [EMAIL PROTECTED] > > > > Daron > > > > -----Original Message----- > > From: [email protected] > > [mailto:[EMAIL PROTECTED] On Behalf Of Paul Finch > > Sent: Tuesday, May 03, 2005 7:07 AM > > To: [email protected] > > Subject: RE: [Repeater-Builder] voting receivers with simulcast > transmitters > > > > 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, > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > Yahoo! Groups Links > > > > Yahoo! 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