Re: {Collins} 516-f2 questions

[Robert Thomas <ve3tou@xxxxxxxxxxxxxxxxxxx>]

I don't think I'd put a transient suppressor across the switch; if it 
leaks or shorts, there'll be some voltage applied to the transformer 
primary with the switch off. Anyway, a  suppressor across the 
transformer will work about as well for reducing inductive kicks across 
the switch (although it can damage the switch if it shorts). In any 
case, I agree the suppressor (and everything else) should be after the fuse.

I also agree about the line bypass caps.

73
Bob


On 6/28/2011 1:40 PM, Jim Garland wrote:
> I don't think it matters much which side of the switch the transient
> suppressor is connected to, so long as it is after the fuse, though I prefer
> placing it before the switch. The reason is that if the suppressor should
> short out, it would be better if the short circuit current wasn't routed
> through the switch. You might also place a suppressor across the switch
> itself, to protect it from the  inductive kick of the xfmr when the power
> supply is switched off.
>
> The .01/1KV bypass caps should be replaced with modern AC line-rated caps.
> These are normally specified as  "Class X1 Y2 250VAC"; an example is Mouser
> part number   81-DE2F3KH103MN7A, which sell for $0.62/each.
>
> 73,
> Jim W8ZR
>
> > -----Original Message-----
> > From: kc9cdt@xxxxxxx [mailto:kc9cdt@xxxxxxx]
> > Sent: Tuesday, June 28, 2011 10:11 AM
> > To: collins@xxxxxxxxxxxxx
> > Subject: {Collins} 516-f2 questions
> >
> > Hi everyone...
> > I am finishing up a 516-F2 rebuild and want to add a transient
> > surpressor.
> > The instrunctions I have (very old) say to add the surpressor acreoss
> > the trans primary...which is fine, but, their diagram shows it across
> > the 115vac primary all the time ...
> > I am thinking it should be after the power switch so when it is plugged
> > in but off the surpressor has no voltage on it.
> > What is the best way??
> >
> > Also, this supply already has .01 1KV ceramic safety caps on each side
> > of the power line to ground...should I leave them in as well??
> > Thanks,
> > 73,
> > Lee, KC9CDT
> >
> > Lee Simmonds
> > Summit DCS LLC
> >
> > 260-799-4077 Office
> > 260-403-6936 Cell
> >
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>   NETS: Tues&  Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>    SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>    1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
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