[AMRadio] Re: RE:Insulating tranformers, chokes, etc.

[Donald Chester]

Jay,

Never thought about the rubber shock mounts (made like  miniature motor  
mounts on a car) catching fire from HV.  I t hink that would happen only if 
the choke had a dead short f rom winding to core.  As it is, it keeps the 
frame floating electrically while mechanically supporting and shock mounting 
the chokes  to reduce the extremely annoying 60 cycle vibration that 
otherwise is transmitted throughout the metal transmitter cabinet.  As long 
as the rubber doesn't become leaky and effectively ground the case of the 
chokes, everything should be OK.  Maybe I should hi-pot from choke frame to 
cabinet ground from time to time.  If a mount did catch fire, I  think the 
compartiment in the cabinet would contain the worse of the smoke andx soot, 
but it would still leave a smelly mess.  I might try to mount rubber and all 
on some additional  HV insulation.  I like the quietness of the chokes shock 
mounted.

73,  Don K4KYV

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