I have used my TL-9922A on 17m. I use the 15m position and my plate is at
the 2 o'clock position and the load is at setting 4. I get a good output
but after a little use I have noticed a burning smell. Something gets hot. I
haven't damaged the amp yet but I don't know how to diagnose the problem.
This doesn't happen on any other band
Mark N1UK
----- Original Message -----
From: "Dennis W0JX" <w0jx@yahoo.com>
To: <k7awb@msn.com>
Cc: <amps@contesting.com>
Sent: Thursday, 24 September, 2009 7:57 PM
Subject: [Amps] TL-922 on 17 Meters
Steve:
Your TL-922 will operate fine on 17 meters. However, you MUST use the 15
meter position. The reason for this is that the input network will not pass
18 Mhz RF in the 20 meter position but the 15 meter input networks will.
To get adequate drive, you will have to use the antenna tuner in your
transceiver to match the input impedance present with the 21 MHZ input
network on 18 MHZ.
There is one serious precaution you should observe. The TL-922 bandswitch is
a weak spot in the amplifier. Because you would be using the 15 meter band
position, the output tank Q will be considerably higher and the RF current
through the bandswitch will be higher than normal. So I would not push the
amp and would run it at lower output, say 900 watts.
73, Dennis W0JX/8
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