[Milsurplus] GRC-9 Power supply Question

[mac]

Well, OK.  Been hearing about the "light bulb burn-off" technique for  
years. Have to admit I've never tried it but certainly enough positive  
reports to indicate it does indeed work.  In mechanically cleaning off  
the contacts, though, I've found that the sulfide (or whatever it is)  
coating is VERY hard and grinding it off  takes some significant time  
and effort so have been  somewhat skeptical about the apparent ease  
and effectiveness of electrical burn-off alone.  Further, the light  
bulb method doesn't pass current through all the contacts internal to  
the relay and it seems problematical to me that mechanical contact-to- 
contact burnishing action alone would result in sufficient cleaning  
action.  (Note, though, that John and Robert report running  current  
through these contacts too in a later messages.)

Bottom line, I guess, is to use whatever method works for you.

Dennis D. W7QHO
Glendale, CA

The Tea Party - thousands of hard-working middle-class FOX viewers  
fighting to make sure the rich pay less in taxes.

**********

On Sep 20, 2010, at 11:53 AM, Al Klase wrote:

> On 9/20/2010 1:46 PM, mac wrote:
>> .....Don't be too surprised if the vibrator for the receiver PS  
>> doesn't
>> work the first time you apply power.  Common problem requiring  
>> opening
>> the can and cleaning the contacts.....
>>
> OK, OK, You've put me over the edged, so I've put the easy solution on
> my website:
> http://www.skywaves.ar88.net/commrx/Maintenance/Waking%20Up.doc.pdf
>
> You probably don't have to open the can.  I'm about 11 for 11 on  
> saving
> vibrators this way.
>
> In Greg's case I beleive you're working with a shunt operated  
> vibrator,
> so just hook up to pins 1 and 7.
>
> I'm about 11 for 11 on saving vibrators this way.
>
> Regards,
> Al
>
> -- 
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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