Thanks to all that replied. This is a club repeater and I am under pressure to fixed the de-sense. So far, everything/trick I have been told really didn't help the de-sense until now.
I turned up the power all the way and it appears to be a 110 watt radio. I say appears as there are no markings to ID what model it is. Anyway, I turned it back down to 55 out and the Daiwa CN-801HP swr/wattmeter shows on the reflected side that there is just a little bit of swr. The needle moves just off the zero, not enough even to say that it reads 0.1. 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. One more question. One of you said that the G7-144 is not a very good antenna. I can not put up a DB 224 type antenna as we only have access to a Rohn BX tower and the DB will not fit on it where the tower is located. We must have an antenna that someone can man handle to put it on top of a mast. Any other antenna suggestions that might work better than the used G7-144 we are now using? Thanks again and 73 John, W3ML --- In Repeater-Builder@yahoogroups.com, n...@... wrote: > > At 10/4/2009 11:24, you wrote: > >Hi All, > > > >I am looking at the changing radios on our repeater because of the > >problems we are having. > > > >We are using a GE Mastr II into a 6 can duplexer and up via 1/2 hardline > >to a G7-144. > > > >However, we can not raise the power above 10 watts before de-sense sets in. > > What makes you think the problem is the TX? I can't even remember a case > I've seen where a problem similar to what you describe turned out to be due > to a bad TX. > > > Also the radio will climb in power level as it gets hot. > > > >I set it at 5 watts out and by the end of a half hour net it is up to 12 > >watts out. > > > >In my opinion this is not right. > > Sounds exactly like what a 75 or 110 watt Mastr II RFPA would do. You need > to run it at a power level closer to its rated power. If you need less > power, you need a PA with lower output. I'm about to throw a 110 W VHFHB > Mastr II mobile on my bench that's going to have it's final PA bypassed: > routing the 25 W driver board straight over to the harmonic filter input. > > >What radio would be good for a 2 meter repeater. > > If you don't like the GE Mastr II, how about a GE MVP? ;) > > Seriously, if you feel you must use current production equipment, the > Kenwood TKR series seems to perform the best. > > Bob NO6B >
