>
>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
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|