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[AMPS] Shorted Pi-Networks Turns revisited

To: <amps@contesting.com>
Subject: [AMPS] Shorted Pi-Networks Turns revisited
From: wb8jkr@juno.com (Mark S Graalman)
Date: Wed, 13 Sep 2000 18:16:35 -0400
  I'm afraid I don't quite follow this Rich. (?)
Mark  WB8JKR


On Wed, 13 Sep 2000 13:27:42 -0700 measures <2@vc.net> writes:
> 
> >
> >> 
> >> Most home built amps use large switches that have a high enough 
> voltage
> >> rating to prevent any problem - so any switch could be used.  The 
> question
> >> may be more difficult to answer in the SB-220.  It used a 
> receiving type
> >> band switch wafer.  So, by using a non-progressive shorting 
> switch to
> >> replace the original progressive shorting switch, the question 
> arose
> >> whether the voltage rating of the switch would be exceeded.  I 
> did replace
> >> the original switch (which had failed) with a non progressive 
> shorting
> >> switch and it has worked fine.  The answer may be that I was 
> lucky.
> >
> >The SB-220 used a series 300 switch, the same as most other 
> >commercial amplifiers with supply voltages less than 3000 volts.
> >The actual rating of that switch is 2.25 amperes@28VDC while 
> >switching under power.
> >
> >The current carrying capacity is 12 amperes with the contacts 
> >used, and the rated dielectric breakdown is 1500VAC. .....
> 
> This is why the 220 (and the 922) needs a stepstart circuit.  
> 
> -  Rich..., 805.386.3734, www.vcnet.com/measures.  
> end
>
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