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 <*> 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/
