Haven't been following this thread that closely, but if Mobile to repeater coverage in your downtown core area is good but HT coverage is marginal, (and coverage everywhere else is acceptable) why not 1. try a preamp on your repeater receiver or 2. consider changing out the cabling from the repeater antenna all the way back to the receiver to reduce line loss to a minimum.
A 6-10 db gain preamp should bring the HT's up out off the background equal to the mobiles. Maybe you could borrow on long enough to try it out and see it it helps before you invest in one. I run preamps on all my UHF repeaters without any problems. VhF is another thing because of the narrow spacing on the Ham band but if you have a wide spaced VHF system it should work as well. Reducing you cable line loss , plus a good tuning of the receive side of the duplexer and repeater reciver wouldn't hurt either, if you haven't already done so. My 2 cents worth. -- Doug N3DAB/WPRX486/WPJL709 ---- Rick Szajkowski <[email protected]> wrote: ============= its not a voted system .. the repeater is a Harris Radio Phone repeater and I was looking at a Ge Phoenix VHF to UHF to the repeater site UHF phoenix to the controller again just to help cover the HT's in town .. ( small town ) Was thinking just a simple J pole for the VHF side does not need a lot of gain and will be on the roof of a 2 story building like I said just an idea to extend coverage to handies in the down town core .. every where else the coverage is fine coverage for handies is spotty down town .. mobiles are fine On Sat, Feb 21, 2009 at 10:33 PM, Laryn Lohman <[email protected]> wrote: > --- In [email protected]<Repeater-Builder%40yahoogroups.com>, > "rtc_0001" <rtc_0...@...> wrote: > > > > Problem #1: Unless you incorporate an > > adaptive delay into each audio path, > > you'll have audio arriving out of sync > > from the various rcvrs. This is where > > your echos will come from. > > The microseconds of difference would not be the issue. It's when you > mix a noisy receiver's audio with a full quieting receiver's audio, > the result is noisy audio. You can't (usefully) mix the two. > > > > > Problem #2: Your audio will probably > > comprise unequal freq responses due the > > different rcvr & link characteristics. > > True, problem #2 will need (at least should) to be solved if you use a > voter. And it's relatively easy, especially if you use the same > brand/model of radios for each portion of the system. In other words, > matching/same units for the remote receivers, again for the link > transmitters, and once more for the link receivers. So you could use > Mastr IIs for the link transmitters and Micors for the link receivers, > no problem. > > With the four receivers on our voting system, I've not had to do any > special EQing for reasonably good audio, with little difference > between receivers. > > For more on voting systems: > > <http://www.repeater-builder.com/tech-info/votingcomparators.html> > > <http://www.repeater-builder.com/tech-info/remotereceivers.html> > > Laryn K8TVZ > > >
