We have 10 of these in service in my area, 8 out of 10 do the exact same thing, the "ECHO EFFECT", That is what I call it. They are great radio's and make excellent UHF repeaters.
I have found that removing the internal speaker jumper from the back plug helps and also making sure that the volume knob on the front panel is turned all the way down before I leave the site seems cures this problem.
Bob Lott "K7SOB"
"Derek B. McIntyre" <[EMAIL PROTECTED]> wrote:
Hello Group,
Recently installed a Kenwood TKR-820 on the ham band for a local
repeater. Went through the service alignment and all checks well.
Aligned both TX and RX VCO's and noticed while the transmitter is
keyed, lightly tapping on any component in the TX/RX section
modulates the carrier.
Didn't think much about this until we did the install. The repeater
sits on a shelf in a television station transmitter room. The
blowers and HVAC equipment in the room are rather loud. When I got
back home, I keyed the repeater and noticed a continuous microphonic
hum on the repeater carrier, obviously coming from the vibrations in
the transmitter room. The "hum" isn't bothering anything. It's just
barely there.
I have noticed other TKR's doing this, some worse than others. Is
there a common problem associated with these, and if so, is there a
common fix?
Thanks,
Derek KC4FWC
http://www.w4dex.com/kc4fwc/444400.htm
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