>
>// The explanation that such a choke prevents HV from appearing on the
>antenna (in the event that a DC blocker capacitor fails) is yet another
>"old wives' tale" because typical Load capacitors arc at well under
>2000v
>
>I am surprised that such poor engineering practice is being suggested.
Some folks don't think much about details. How many guys believe that
you can't make 25 811As in parallel work on 10m because the capacitance
would be too high?
>
>The protective choke is selected in the same manner as the HV glitch
>resistor; both should allow the AC mains breakers/fuses to trip without
>self-destructing.
>
>All of my amps use very expensive vacuum variables as loading caps.
>The idea of allowing even the "bread slicer" type caps to arc is not good
>at all, as a carbon path will build up on the plates and lower the voltage
>rating on the cap.
Aluminum variable capacitor plates are easy to file smooth.
cheers, Phil.
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|