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 Repeater-Builder@yahoogroups.com, "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 ???
>
