[AMPS] ALC - an elementary question

[Rich Measures]

>
>I don't use ALC on my TS-930--SB-220 conbination, because at full blat my
>TS-930 won't overdrive the 220.  That leads me to conclude that as long as
>I run the 930 cleanly, the 220 won't add any additional distortion.
>
true

>But Tom's recent posting about his TS-450/SB-200 combination had me
>reviewing what (I think) I know.  It seems to me that the 450 would be
>capable of overdriving a single 3-500 and maybe even the 572s in the
>SB-200.  

Easily.  It could drive a pair of 3-500s or 4, 572s.  

>Certainly, an FT-1000D could do so.  That being said, ALC seems
>like a good idea, in theory, but I wonder -- how can inter-unit ALC work
>with an amplifier and a transceiver that weren't designed to work together
>in the first place?  

Not very well, if at all.  One way to get a mistune is with alc.    

>What assurance could you have that the transceiver ALC
>circuit was supplying the right voltage at the right time?
>
I wud not use transceiver/amplifier alc.  For ssb, onset time delay 
causes problems.  //  Turning the drive power down to what is needed, and 
letting the transceiver's alc manage the output, works ok.  If the 
transceiver has no output level control, add RF NFB in the cathode 
circuit with a cathode resistor.  
-  later, Pete


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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