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[AMPS] Shorted Pi-Networks Turns revisited

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Subject: [AMPS] Shorted Pi-Networks Turns revisited
From: wb8jkr@juno.com (Mark S Graalman)
Date: Wed, 13 Sep 2000 19:24:17 -0400
 I thought they were talking about bandswitches.

Mark  WB8JKR

On Wed, 13 Sep 2000 16:22:53 -0700 measures <2@vc.net> writes:
> >
> >  I'm afraid I don't quite follow this Rich. (?)
> >Mark  WB8JKR
> >
> The TL-922 and the SB-220 draw so much current at turn on they dim 
> lights.  A stepstart reduces inrush current and prolongs the life of 
> the 
> on/off switch. 
> >
> >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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