[Kenwood] TL 922A Tune Up

[John Tait]

A tuning pulser is a very useful gadget for safely tuning your amp. 
Commercial units  are available, or if you'd like to homebrew your own, take 
a look at http://www.iol.ie/~bravo/Woodpecker.htm
   73
     John EI7BA


> Jim - K8ARY wrote:-
>
>> In the CW mode of the manual, Step 6 of the procedure states: "Quickly
> switch the amplifier to lp and dip the plate". There is no "lp" meter
> position. There is the IP meter, however that appears to be reading plate
> current all the time.
>
> Jim....
>    I don't have a TL-922A amplifier, but I do have a Heath SB-200 amp. As
> with any tube amplifier, the tuning procedure would be about the same. I
> suspect the lp meter you mention above is actually an ip (IP) meter. IP is
> an abbreviation for Plate Current, (I=current;P=plate) which is what you
> should be concerned about dipping. The idea is to obtain as much RF output
> with as little plate current (IP) as possible. As you dip the IP, you 
> should
> see an increase in RF output. This is bringing the tube(s) into resonance.
> This also works easiest into a dummy load as it's an almost perfectly
> resistive load, and you won't bother anybody on frequency!
>
>> My thought is to leave the meter in the RF position to dip the plate and
> adjusting for maximum output.  What is the correct procedure?
>
>    This is basically the same as doing what I suggested above. The end
> result will be the same...lowest possible plate current for highest RF
> output.
>>
>> I would also be interested in dos and don'ts for this amp.
>
>    While doing the dipping and loading of the tube(s), it's best to use 
> the
> least amount of drive from the exciter as you're dipping and loading the
> final, and gradually increase the drive to the amplifier.
> Sounds like a lot, but it really goes quite quickly once you've done it a
> few times...usually takes less than a minute.
>
> Hope the info helps...
> Cheers....
> Darrell
> VA3DG/VE3DDG
>
>
>
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Kenwood at mailman.qth.net
>