[AMPS] Shorted Pi-Network Turns

[measures]

>
>> The problem in the Heath SB-1000  switch arcing IMO
>> is due to the layout and the Tesla effect.  If the 80-160 meter tank coil
>> had been wound on a torroid, the problem would have been solved. Just too
>> much coil in too little space. As the inadequate padder door knobs change
>> value due to heat, the problem will raise its ugly head by burning out the
>> band switch. The addition of the washer on the switch contact is not
>> enough to overcome the inevitable when values start to change in the
>> padders. Ameritron has solved this problem by using robust mica caps as
>> padders, which fit nicely into the SB-1000.
>> 
>> IMO,  the Tesla effect is the culprit in arcing switches.
>
>The SB1000 had about 50 times the switch failures (as determined 
>by parts shipped to customers) of the nearly identical AL80A.
>
>The reasons were:
>
>1......
>
>3.) No anti-corona washer at an area in the switch where voltage 
>gradient is a problem.
>

3000v corona.  Give us a break.  .  I have spoken with a number of owners 
who were experiencing intermittent arcing with the anti-corona washer 
installed.  Arcing reportedly stopped when the VHF Q of the suppressor 
was lowered.  /arced bandswitch photos are on my Web site./
end

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


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