At 05:39 AM 1/27/04 +0000, you wrote: >I'm sure this has been discussed before but what are your thoughts >about a good quality base station dual band (2/440) antenna's? I >know I can get the Diamond / Comet but was woundering if there's >anything out there in the commercial world. > >Thanks......
I've seen several situations where a 8-pole dual band antenna was built by taking a VHF 4-pole and a UHF 4-pole and mounting both on one mast (UHF on top), and either using two feedlines or a TX-RX diplexer into one feedline. One "gotcha" - watch out for the 3rd harmonic of the VHF TX landing on the UHF input, and watch the VHF RX freq if the UHF TX uses a tripler as the final multiplier. I was told about one system by the owner where he claimed to have to add a UHF notch cavity to the VHF TX line to notch out a harmonic... he referred to it as a "suck-out" cavity. Mike WA6ILQ Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
