--- In [email protected], Eric Lemmon <[EMAIL PROTECTED]> wrote: > Jed, > > There are several options, all of them expensive. Whether you go the > hybrid-ferrite route or the cavity-ferrite route depends not only upon > the frequencies of your two repeaters, but also those of other > transmitters at the site. Either way, you must separate the two > receivers from the two transmitters. > > A combiner is used to feed both transmitters to one antenna so that each > transmitter sees a good 50 ohm match to the antenna, but is isolated > from the other transmitter. When a hybrid is used, you lose slightly > more than half of the power from each transmitter. That is, when you > combine two 100 watt transmitters using a hybrid, each transmitter now > has about 40-45 watts going to the antenna. The cavity route is better, > but is more costly. > > A multicoupler is used to split the receive frequencies from a separate > antenna to the two receivers. There will be a preselector or bandpass > cavities ahead of an amplifier, and a splitter to divide the signal > among the receivers. > > Since you must have two antennas and the equivalent of two duplexers to > make either system work, it is very likely cheaper to simply use two > antennas- one for each repeater. Even if you have two commercial- grade > repeaters, you almost certainly will need ferrite isolators and low- pass > filters on both machines. Choose wisely... > > 73, Eric Lemmon WB6FLY > > > Jed Barton wrote: > > > > Hey guys. > > OK, this is a bit greek to me, so your info is appreciated. I have 1 site and 2 repeaters. We don't have the space to put them on separate antennas... Could I run 2 UHF repeaters on 1 antenna?...
Some of the info you are getting is good but its not your only option... you should be able to use a single antenna very easily with a T pass combiner from TX RX inc. If you give them a call they'll be happy yo help you... You can in deed have 2 tx and 2 rx on the same antenna ..I do it often comercially... Keep the splits as both low in and you should be ok.. NOW as for cost....Each tx channel will set you back at least 1000 dollars depending on how many cans and circulators you need for each...(tx rx will calculate this for you)... you'll prob need one t pass and one(poss 2) varinotch can for each rx channel ... prob 700-900 for each recieve channel..... SO plan on spending around 4000-5000 for the 4 channel tx/rx combiner with shipping....It sounds like a lot but its the best way to do what you need to do.... Good Luck Dave ka1uag Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
