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You might try the old trick of encasing the microphonic
circuit in wax. Candle wax works and can be removed easily if repairs are
needed. You can use a piece of masking tape to form a dam around the desired
components. Use clear or uncolored wax. 73,Lee,N3APP
----- Original Message -----
Sent: Saturday, November 08, 2003 11:31
PM
Subject: Re: [Repeater-Builder] Kenwood
TKR-820 is microphonic
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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