[AMPS] ssr's in qro amps

[measures]

>
>At 07:59 AM 6/27/00 -0400, Mike Sawyer wrote:
>
>>     What I would like to know, is if you have some sort of delay worked out
>>so that you don't generate RF until your Ep is up to full potential and is
>>stabilized.
>>Some of us see the merit in your actions.
>>73,
>>Mike(y)
>>W3SLK
>>
>
>Well, Mike, it turns out that there are several added benefits to this 
>approach, for me at least. One of those is that no additional delays or 
>sequencing are needed. Oh sure, the purists will insist that spectral 
>purity is impaired for the few  milliseconds between the time full drive is 
>applied to the cathode on a typical amp and the time the PS is up to 
>nominal. 

A typical stepstart steps in about 500mS.  

>However, since the actual power out is relatively low, it turns 
>out to be a "don't care".
>
>What this means for the home designer is that no special relays or speed up 
>circuits are required to avoid hot switching. No "cut off bias" circuits 
>are required to keep the tube cool during RX time. Also, those times when 
>the ZSAC is zero and power supply idle voltage are highest are eliminated, 
>thereby by reducing the stress on bleeders and filter caps.
>
[chortle].   

>The down side is: no chance for QSK, (no loss there), loss of the first dot 
>using "break-in" cw (easily compensated for by sending an extra dot), 

You gotta be kidding.  

>and 
>the need to be mindful of PS diode surge current.
>
Running the amplifier through a stepstart cycle 10 - 20 times a minute 
(SSB - VOX) is scary.  So what do we do, say the first word of each 
sentence twice?

>This approach is not for everyone. 

Amen to that.  It's wacky.  

cheers, Larry

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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