>Subject: [AMPS] Kenwood TL-922
>Sent: 3/28/1997 11:48 AM
>Received: 3/28/1997 12:43 PM
>From: Neuman, Rick {ch1x}, rneuman@pcs.bls.com
>To: 'amps@contesting .com', amps@contesting.com
>
>How about some comments on the Kenwood TL-922...
>
>I personally own one, yeah I know, it doesn't put out any power, but it
>does gives me 1200 watts at 120V while having a small footprint. Though
>I am not an amplifier design engineer and cannot comment on the
>electrical design, I did open it to do the 10M mod and considered the
>inside of high quality and extremely compact design.
Mechanically, it is superb.
>I can say that when I was performing the 10M mod, though successful, it
>did not work very well on 10M.......snip...... Has anyone else
>experienced this?
Yes. The Q of the ten meter tuned input is too low. Q needs to be a
minimum of 2. Some other bands have the same problem. On 75m, Q is 0.7.
>Also, has anyone done anything to beef up the power supply to enable
>more output power ...snip.......
I have tinkered with increasing the V. It is a waste of time and money.
The weak links are the fan and the bandswitch. Otherwise, the 922 would
handle 4000v on ssb--but the guy on the receiving end would never know,
Rick. Even for 3kV opertion, reducing the VHF voltage amplification of
the 3-500Zs is not a bad idea. High speed switching would be nice. It
is about 35db quieter, makes vox pleasurable instead of painful, and it
eliminates hot-switching with modern radios.
If want to obtain a modest 8db power increase, you need a 50a 240 dryer
outlet and a tetrode with handles. Info on building such a machine can
be found on my Web site.
R. L. Measures,ag6k,805-386-3734
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|