Hi Jeff, I'll try a different antenna... perhaps that's it.
Horizontal isolation possibly not enough, but 'only' running 30 watts out, & the repeater is a quantar, & all leads are RG214, so didn't figure that would be it... I've seen a lot of installations with antennas pretty close to the system. Might try a matching network to tune out swr, just to see if that's it. Metal building - no HVAC or stacks, etc. Just an empty (mostly) concrete slab with a metal building on it. Milt - Seems I did put the meter at the antenna & pretty much saw the same thing. It's about what I expected, as the 224 is not the ham version - it's the 150-160 meg version. thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, "Milt" <men...@...> wrote: > > While you are out at the antenna, stick the wattmeter in line and check the > foward/reflected there with the antenna and the dummy load. My guess is > that you will quickly find your problem. > > I would check the connection to the DB-224 coax as well as the connections > to each element. Also check the center connection. > > 30 foward and 3 reflected is a whole lot higher than I would accept; at > least 10% of your RF out is being reflected. > > Milt > N3LTQ > > > > ----- Original Message ----- > From: "tahrens301" <tahr...@...> > To: <Repeater-Builder@yahoogroups.com> > Sent: Tuesday, September 01, 2009 4:02 PM > Subject: [Repeater-Builder] Re: Antenna SWR = Desense? > > > > Hi Joe, > > > > The repeater/duplexer is in my workshop (a large metal building). > > > > The heliax goes out the window to a smaller portable building > > about 100' away (horizontally spaced). The antenna is on > > that building about 10' off the ground. > > > > > > > > Don - took the dummyload & analyzer to the end of the hard line, > > fed it into the iso-tee there. No desense is noted. Something's > > not right when the antenna gets hooked up. Maybe I should put > > up the ringo for a test..... at least it's probably a bit better > > of a match. > > > > > > > > --- In Repeater-Builder@yahoogroups.com, Joe <k1ike_mail@> wrote: > >> > >> You state "DB-224 100' horizontally & 10' vertically separated". I > >> don't understand what you mean by that. > >> > >> Joe > >> > >> > >> tahrens301 wrote: > >> > However, putting the system on the antenna (a 150-160 mhz > >> > DB-224 100' horizontally & 10' vertically separated) > >> > through a metal building fed with 7/8 heliax, there > >> > seems to be no end to the desense! > >> > > >> > > >> > > > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > > -------------------------------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.392 / Virus Database: 270.13.73/2338 - Release Date: 08/31/09 > 17:52:00 >
