[Milsurplus] GRC-9 Power supply Question

[J. Forster]

I think you have to run the current through all the contacts. Just
vibrating the reed will not do the job.

Also, the voltage has to be high enough to "punch through" the surface layer.

FWIW,

-John

===============


> 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/
>>
>> ______________________________________________________________
>> Milsurplus mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Milsurplus at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>