I had an arx270 to slowly burn the cap out @ the feed point of the antenna. They will not handle 100 watts @ feed point on continuous duty. I contacted Cushcraft and they sent me a new cap at no charge. I use it home now, no repeater use. Bruce, KD4BOH. ----- Original Message ----- From: "Eric Lemmon" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Thursday, May 12, 2005 3:41 PM Subject: Re: [Repeater-Builder] Repeater Desense
> Bob, > > The most recent instance was with a Cushcraft ARX-270 2m/440 antenna. I > watched this antenna being assembled, and I can state that there was no > corrosion, maladjustment, or looseness involved. We used that antenna > briefly > for a 2m repeater simply because it was already in place, and we had a > special > event to cover. A Motorola RKR-1225 repeater was hooked to it using > LDF2-50 > Heliax feedline. When the Cushcraft antenna wouldn't work without major > desense, I swapped it for a Sinclair SRL-222 dipole, which worked > perfectly. > > 73, Eric Lemmon WB6FLY > > Bob Dengler wrote: > >> At 5/12/2005 12:37 PM, you wrote: >> >Yes. Many repeater receivers are simply not well enough shielded to >> >keep the TX from leaking into the RX box. Even some commercial >> >repeaters will suffer desense if 100% shielded feedline is not used. I >> >have seen serious desense occur when a dual-band (2m/440) antenna is >> >used on a repeater, due to the uneven gain versus frequency response of >> >many such antennas. >> >> A narrowband antenna by itself will not generate desense. Your problem >> was >> probably due to corrosion, dielectric breakdown, or some other cause >> related to poor construction/materials in the amateur grade antenna. >> >> I would like to know what model antenna this was though, since I have yet >> to see any desense problems with my Comet antennas. >> >> Bob NO6B >> >> >> Yahoo! Groups Links >> >> >> >> > > > > > > > > Yahoo! Groups Links > > > > > > > > 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/