Not sure about the FR4000, but I know that the Kenwood TKR-x50 series can be programmed to have a different "standby" transmit frequency.
What you are hearing is the transmit oscillator running, with no power being applied to it by the internal power amplifier. This is a problem in synthesized tranmitters where the oscillator stays on at all times. You will hear its signal for a few hundred feet. Check in the programming if you can set a different "standby" oscillator frequency, and then set it to something closeby, but something that will not cause you any interference. I have a few Harris Alpha 2000 full duplex radios that exhibit this behaviour. A TKR-750 I recently wirked on also had this, but I managed to get rid of it by using the standby feature. Dave Cameron VE7LTD --- In [email protected], "ki4ggh" <[EMAIL PROTECTED]> wrote: > > Hi group, > > I seem to be having an RF Problem with a new Icom FR4000 Repeater. The > repeater is letting out a hissing noise when I listen to it on a HT or > my mobile radio. The hissing noise sounds more like a squelch that is > opened up. When I get about 300 feet from the repeater the noise is > gone. It does not key the transmiter. This is why I am puzzled. The > only way I have found to get arround it is turn my squelch way up on my > HT to remove the noise. When I key up my HT the noise drops out while > the repeater is transmitting. The repeater and repeater tower is at my > home. If it was several miles out of town I would not be emailing you. > I have mounted it in a metal case, grounded the repeater by the > grounding screw, grounded the coax by twisting copper around the coax > sheild, grounded the repeater cabinet. I first thought that the problem > was from the duplexers. Not so, I took the duplexers out of line and > still noise. The only way to remove the noise is to turn off the > repeater. Something I don't won't to do. Any thoughts ??? >
