Okay Eric,
I will check the power supply again. But, yes most of them use Yaesu and couple have Icoms. But, the hum is nothing we can't live with. I don't hear it at all on the speaker hooked to the repeater. But, of course my hearing is not the best anymore. All I know it is nice to have the thing working like a repeater should. Thanks and 73 John, W3ML --- In [email protected], "Eric Lemmon" <wb6...@...> wrote: > > John, > > What is the CTCSS tone frequency? You might use a service monitor to see if > some of your repeater users have excessive CTCSS deviation. Yaesu, Alinco, > and Icom radios seem to have way too much tone deviation, and- > unfortunately- the tone deviation cannot be adjusted separately from the > voice deviation. Some samples of the above radios have CTCSS deviation > above 1200 Hz! CTCSS deviation in the 400-500 Hz range is plenty. > > Another hum source, especially if you're using an Astron power supply, > occurs when the power supply's negative terminal is grounded internally to > the case. As I reported in an earlier posting on this list, that situation > is almost always going to inject an AC hum into the repeater audio. Check > to ensure that the DC power supply negative terminal is not grounded. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of W3ML > Sent: Sunday, November 08, 2009 5:43 PM > To: [email protected] > Subject: [Repeater-Builder] repeater problems solved > > > > Hello, > > I wanted to thank everyone again for the recommendations on how to fix our > system. I made several of the changes posted and we replaced the antenna and > hardline with new ones. > > The system is working right now. The problem with the radio power going up > has stopped and the noise is all gone when people talk. > > Only one thing to figure out is a low hum coming across on transmit. > > We have ruled out the power supply. From what I have read on here today in > old messages, I feel it may be the CTCSS coming through. > > But, it is nice to have the power up high and to be able to understand > people when they talk instead trying to make it out through the noise. > > Thanks again for all the help. > 73 > John, W3ML >
