Sounds as if you are missing a duplexer. A duplexer is a passive device that allows your repeater to transmit and receive on one antenna simultaneously without degrading your receive performance while you strong transmitter is on the air (aka - desense). Most Quantar repeaters ship with a duplexer from Motorola that fits within the cabinet (of course I am speaking for the commercial world, not government). Also, if your stations have antenna relays on them (sounds like one does), they need to be removed and deprogrammed from the station (either in the hardware configuration screen or in the RF configuration screen). Also, separated antennas on the VHF band would need typically several hundred feet VERTICAL isolation or probably more than a mile of horizontal isolation to work properly if your transmit and receive frequencies are wide spaced. Lastly, for best field performance of repeaters with duplexers under your conditions, it would likely be best to pick frequencies about 3-5 MHz apart for transmit and receive pairs and make all of your receive frequencies near each other and all of your transmit frequencies near each other (example - Receive 1 136.025 MHz, Transmit 1 141.025 MHz, Receive 2 135.975 MHz, Transmit 2 140.975 MHz).
Hope this helps somewhat! Messed with all kinds of RF James WJ1D mark wrote: > Hi all; > I am currently deployed to Afghanistan. I received four quantar repeater/base > stations for use here, plus 140+ XTS5000R handhelds. I am attempting to setup > the Quantars as repeaters on the VHHF1 band, in non astro/analog mode. I have > one setup with a separate transmit, and receive antenna. These antennas are > the Andrews Omni, Exposed Dipole Antenna type. I am configured for scan mode, > using four channels. > > The second Quantar is configured for one T/R antenna. (Ran out of mounts here > for antennas). At first the setup worked well. (I have various models of > handhelds using the system, this is why i chose non astro cofiguration.) > Shortly after activation, certain handhelds were not able to hit the > repeaters. Both are setup for 125W output. It seems after these were put > into use, our radio coverage is worse, not better. > Is there an option I'm missing in the software config. of these repeaters? > I am new at the repeater business. My background is more tactical radio > configurations. This is my first time with repeaters. > Any assistance on this is GREATLY appreciated. > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > >
