Thanks Tom, The wind was calm today and knowing that the sections tend to work loose, we screwed them together with sheet metal screws. I would like to get a DB antenna but 700 bucks is not in our budget.
73 John --- In [email protected], Tom Parker <t...@...> wrote: > > Hello W3ML, > > I've been following this thread over the weekend and I think the issue > has been addressed. I would check the antenna and related connectors. > In fact, for my 2 cents, I'd replace the G7 with a commercial grade > antenna, such as a DB product or equal. Now, to your scenario today, I > would ask what the wind was like? If memory serves me correctly, that > G7 has a couple of joints and is somewhat flimsy in terms of material > strength and antenna height. > > There ya go, > > thp > > W3ML wrote: > > > > > > Hi Tom, > > > > I did crank up the power to 55 watts out of radio and that gives me 45 > > out of the duplexer. Decided on this wattage until I can figure the > > problem better. It is working better than before, but still having > > trouble. > > > > So from what you said about power coming out duplexer, the duplexer > > must still be okay. > > > > However, during the day today there were 3 hams talking and they said > > (later) that all of them were loud and clear. But, when I got home and > > tried to call one of them, he was covered in noise. > > > > Later one of the others called in and he would be clear, then the > > repeater would cut out and his signal would be gone, then it would > > come back with noise on his signal and then clear again. > > > > Then the other one came in with a lot of noise, then he would come in > > with a little noise and then no noise at all and then back again > > through this cycle. > > > > This cycle of noise and then no noise is driving me crazy. > > > > The set up is this: > > > > GE Mastr II VHF mobile running into a 6 cavity duplexer set to our > > freqs with a service monitor prior to bringing it here. > > > > There is a bandpass filter on the receive side after the duplexer and > > before the radio. > > > > We have used 1/2 inch hardline going up to the used G7-144. > > > > Then only thing I can think of is the radio is bad, the antenna is no > > good and the coax is shot. > > > > Now, the radio was given to us by a group that had used it, but > > decided to replace it with a Kenwood. > > > > I am thinking that they had the same problem and that is why they gave > > it away. > > > > Any advice would be greatly appreciated. > > > > 73 > > John, W3ML > > > > - In [email protected] > > <mailto:Repeater-Builder%40yahoogroups.com>, W9SRV <tgundo2003@> wrote: > > > > > > Ok- > > > > > > 1. Where are you checking the swr at in the chain? Make sure you > > bypass the duplexers to check the antenna, the cans can throw off the > > reading on some meters like you describe using. If you are less than > > 1.5:1 I would not worry too much more about it, any reflected power > > will get eaten up back in the cans. If you are really concerned about > > protecting the TX put a circulator in-line with it. > > > > > > 2. Make sure all the interconnecting cables are good shielded and > > not foil/ braid type. RG-213 and RG-400 are good choices, though there > > are a few more. > > > > > > 3. Terminate into a good dummy load. Set you output power to 80-90W. > > Then run thru the duplexer and check the power coming out of the cans. > > You should see something like 60-70w, depending on the spec of the > > duplexer. If your seeing much less than you may have a duplexer tuning > > issue. > > > > > > Figure out the real problem, let the radio run at a real spec power > > output, than absorb the title of "far lord" as every one thanks you > > for giving the repeater twice as many s-units. (then be prepared for > > the next round of complaints that become your problem) > > > > > > Tom > > > W9SRV > > > > > > Sent from my iPhone > > > > > > On Oct 4, 2009, at 5:46 PM, "W3ML" <w3ml@> wrote: > > > > > > No, except when it was at the 2o watts the swr was almost 1 and > > someone said that was the problem causing the de-sense. So we were > > afraid to run it higher. > > > > > > Like you said guess it was only a problem from running too little of > > power. > > > > > > > > > Thanks and 73 > > > John > > > > > > > > > --- In [email protected] > > <mailto:Repeater-Builder%40yahoogroups.com>, W9SRV <tgundo2003@> wrote: > > > > > > You answered your own question : > > > > > > "So it appears that this radio, which is a GE Mastr II mobile, > > doesn't like to run at the lower wattage of 10 to 20 watts out." > > > > > > 110w radio will not be stable at 10-20w. If you look at your output > > on a spectrum you probably have spurs all over the place. Any reason > > you cannot run it at least 1/2-2/3 power? > > > > > > Tom > > > W9SRV > > > > > > Sent from my iPhone > > > > > > On Oct 4, 2009, at 4:46 PM, "W3ML" <w3ml@> wrote: > > > > > > So it appears that this radio, which is a GE Mastr II mobile, > > doesn't like to run at the lower wattage of 10 to 20 watts out. > > > > > > > > > > > > > > > > > > ------------------------------------ > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > >
