[Amps] TL-922 on 17 Meters

[Mark Robinson]

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 at yahoo.com>
To: <k7awb at msn.com>
Cc: <amps at 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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