Hi Jim, Thanks for the info.
I will probably not put the 440 antenna up - I don't plan on having a 440 repeater out here, just need to receive a control signal. So I'll probably put the diplexer at the bottom & just use the db-224 for 440 receive. Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jim Brown <w5...@...> wrote: > > I operate an antenna with a full size DB-224 and an 8 dipole 440 antenna on > the same mast and found that the 2 meter transmitter does not bother the 440 > receiver, but I do get some desense with the 440 transmitter into the 2 meter > radio. An extra bandpass cavity on the 2 meter receiver cleared that up. GE > Mastr II on both bands. > > I think that the 2 meter dipoles can absorb more power from the 440 antennas > than the other way around, since the third harmonic is resonant on the 2 > meter dipoles. > > I have also operated a DB-224 on 440 with some success. > > I tried a diplexer to combine the two antennas to one feedline without much > success. I wound up using a separate feedline for each antenna and it worked > much better. > > 73 - Jim W5ZIT > > --- On Mon, 7/20/09, tahrens301 <tahr...@...> wrote: > > From: tahrens301 <tahr...@...> > Subject: [Repeater-Builder] DB Products VHF & UHF on same mast? > To: Repeater-Builder@yahoogroups.com > Date: Monday, July 20, 2009, 10:11 PM > > > > > > > > > > > > > I've got a DB-224 that is going up the tower in a > > while when I get the hardline, but control issues > > have changed from land line to 440mhz control. > > > > So I need 2 antennas. > > > > Today I saw a hybrid DB antenna, effectively a 224, plus > > a 16 element DB, all on the same mast. > > > > Is this something that can be done without having each > > antenna interact with the other? Sounds like a good idea > > to me. > > > > Just curious, > > > > Thanks, > > > > Tim W5FN >
