I don't know why I skipped this idea but slow waking up today, I just mounted one of these nick named a half-n-half about a week ago. If mounting only one antenna is your limitation this method has solved the problem more than once, db products can do the stacking and it ends up being about 16 feet high - it could be done with 2 uhf antennas but would need to be braced in the upper 2/3 as the true mast for this by db is a larger size than regular antennas. You would need 2 seperate feed lines but only one base bracket and the upper brace which can be made from schedule 80 electrical pvc tubing and some stainless u-bolts - mcmaster-carr is a place to find them with extra long threaded segments. Adding isolators to the transmitters would be a good idea to prevent causing swr trouble down on the pa decks, but the basic duplex cavities alone would then be used instead of all that expensive combining stuff.
mch wrote: > > Eric Lemmon wrote: > > > > 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. > > Not necessarily. You can combine the combiner and multicoupler on one > antenna, but it's even more expensive then two antennas. > > Here is another possibility: > Get a dual dipole array antenna. It's like a large array, but has two > feedlines - one for the lower half and one for the upper half. Use each > half into a standard duplexer going to each repeater. One 'antenna' (one > mount, one pole), but two feedlines and two standard-duplexed repeaters. > > Joe M. -- 73...Clark Beckman N8PZD Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
