I've been following it too. You can lead a horse to water, but you can't make him drink.
K4LJP On Mon, Oct 5, 2009 at 8:49 PM, Tom Parker <t...@ntin.net> 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 Repeater-Builder@yahoogroups.com <Repeater-Builder%40yahoogroups.com>, > W9SRV <tgundo2...@...> 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" <w...@...> <w...@...> 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 Repeater-Builder@yahoogroups.com<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 > > > > > -- "Always drink upstream from the herd."
