[Amps] IMD & ALC's

[GGLL]

    If one could just use it as a  50 watts exciter (sliding the 
internal 50 W setting switch) with/without a 50 Watts only demanding 
linear, could this working mode being an improve in IMD?, is still an 
ALC overshoot?.
I have a 440 also and don't know (never tried that) what happens with 
ALC readings in the 50 watts max. output.

Best regards
Guillermo - LU8EYW.

Radio WC6W wrote:

>On Sat, 3 Jan 2004 00:20:14 -0800 R.Measures <r at somis.org> writes:
> 
>Hi Craig & Rich,
>
>  
>
>>>I have not read or seen data on the ALC overshoot  problems. The 
>>>      
>>>
>>ARRL reviews seem to politely ignore  the issue. 
>>
>>**  I see c. 20% overshoot on my TS-440S on the first syllable.  
>>Running almost no ALC helps.  
>>    
>>
>
>   Same radio here; same problem.
>
>  NEVER running into "factory" ALC helps more.  :-)
>
>  
>
>>>My main interest in this area is
>>>too emit the cleanest possible signal. Its becoming a uphill battle to
>>>      
>>>
>find
>  
>
>>>a new model radio with a clean transmitter without ALC,  key clicks
>>>      
>>>
>and bad
>  
>
>>>IMD problems.
>>>      
>>>
>>**  Without some form of ALC, excess IMD is a virtual guarantee --  
>>    
>>
>
>  Not necessarily.   Just use some form of hard limiting before the
>"box".    I run a RF clipper with 20 dB of headroom.   
>
>  A great (fast) audio limiter (i.e. an ancient Spectrasonics 610) is
>also a possibility.
>
>  With the mike level under control, one can set the power level just
>like a real radio station and never experience any ALC action;  nor
>clipping.
>
>73 & Happy New Year,
>   Marv  WC6W
>
>
>
>
>
>
>
>
>
>*
>
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