john, Forgot to ask in my first reply. I am assuming that your link radio is also a Mastr II from your original post.
Is it a mobile or a station configuration? Thanks, Joe --- In Repeater-Builder@yahoogroups.com, "John Godfrey" <ke5...@...> wrote: > > I was hoping you can help our club with a repeater link problem. What we > have are all GE master 2 stuff. Here is what we have going on. we have > had for years a 147.270 + repeater that works great. > > Last year we added a link into a central state repeater system using a link > radio on > one of our ports. It transmits on 442.025 and receives on 443.2. For six > months we have used the link fine without problems. Last week we > installed on another port a uhf repeater to be used as a hub for the > north central part of our state to also link to us and the central state > system. The UHF Repeater receives on 449.750 and transmits on 444.750. > We can link the 270 to either the link to central state or the UHF > repeater hub with no problems, but when we link the 270 to both or just > link the UHF repeater to the link radio, once the UHF repeater is keyed > up, the input on the link radio is hearing it so we have an awful squeal > and intermod back into the 270. > > There is also a pager at the location that I can hear when this happens but > not any other time. Again they work fine as long as both UHF machines are not > in use at the same time. When the 270 is linked into Central state, even if > the UHF repeater is not linked in, if you key the UHF repeater you here the > squeal on the 270. I can see how as the link input goes out over the 270 when > they are linked. I am not sure why I can also here it on the UHF repeater > when I unkey it, even if it isn't linked in. Other than the last part of that > it would make since to ne that I have the two 440 antennas to close. We have > them about 10 feet apart, but the one can't go higher and the other can't go > lower and still serve the purpose needed. > > I am thinking I need some kind of filter, that I can put on the link radio, > that will protect it from the transmit of the UHF repeater. In other > words the 444.750 is coming in my receive on the 443.2. Changing freq is > not an option due to several reasons. If I had a filter of some sort, > that would either allow say 442-443.5 to pass and attenuate everything > else that would be great. Or something that would pass 442-443.5 and > attenuate everything above 443.5, then that would work. Guys, what am I > looking for and where might I find it. Must I build something that is > this custom, or can I buy it. If I must build it, where should I start. > If I can buy it,, where from and what would they call it. > > If my thoughts are off base, please help me to know what other questions I > need to answer to solve such a problem as this. I thought maybe the > pager was just interfering, but why would the 270 work fine when linked > to the link radio, or linked to the UHF repeater, and the only time we > have the problem is when the 270 is linked to the link radio and the UHF > repeater is keyed up, regardless of whether the UHF repeater is linked > in or not. > > I know my question is long, but m hope was to explain the > problem with enough detail that you might have an answer for me. > > Your help would be greatly appreciated by our Club. > 73 de John Godfrey > KE5NZY BARC Pres. > DISTRICT B ADEC > ASTEN NM >
