[TMC] C708 in PS-4

[Dave McDonald]

Thanks, John.

I'll look forward to the GPR-90 alignment data.

I found the GPR-90 RXD S-561 but it only had 3 of 6 pages.  You were unable 
to locate the last 3 pages.  Maybe your GPR-90 data will close the gap. 
Please advise us where to look when you get it posted.

S-561 was very interesting and should apply to the GPR-90.

Thanks for all of your efforts,

Dave
K4EWC
----- Original Message ----- 
From: "John Poulton" <jp at cs.unc.edu>
To: "LARRY D GODEK" <telegrapher at q.com>
Cc: <tmc at mailman.qth.net>
Sent: Thursday, May 26, 2011 9:27 AM
Subject: Re: [TMC] C708 in PS-4


> I've only recently become aware of the importance of those "pink sheets"
> that specify changes to the various manuals, and I'm not sure I was
> sufficiently diligent about scanning them on the first pass through the
> TMC manual stash.  I'll see if I can find a complete set of revisions
> for the PAL-1K and add them to the manuals on the website.
>
> In addition, we've recently obtained nearly all of the "specification"
> documents.  These are technically "drawings", so are on that part of my
> website.  There are about 1300 of them.. I'm about 2/3 of the way
> through scanning them, and I've put the first 100 or so on the website.
> Check the website over the next couple of months, as these things become
> available.  There are lots of interesting ones, including the "real"
> alignment procedure for the GPR-90.
>
> Reason I bring this up is that there may be a relevant S-doc that covers
> this change to the PAL-1K..  will try to find it, if it exists, Larry!
>
>  ...
>
> Larry, did you download the manual for the PAL-1KA?  I just had a look
> at the parts list for the PS-4A, and there *is* a C708.  It's the same
> as C704, a paper cap, 0.1uF @ 600V, hermetically sealed bathtub metal
> case.  Bet you've got the "A" version of the rig...  Should show on the
> equipment tags on the front panels, if so.
>
> 73, John K4OZY
>
> On Thu, 26 May 2011, LARRY D GODEK wrote:
>
>>
>> This cap, C708 is uspposed to be across a set of relay contacts in the 
>> PS-4 medium-low voltage power supply for the PAL-1 type linear amps. 
>> It's the same amp as used with the SBT-1 KW rigs.  On any of the 
>> schematics i have it shows C-708 but it's not in the parts list.  No 
>> capacitor has that high a number assigned to it yet it's on the 
>> schematic.  I know it's a .1 but what value voltage.  I want to change 
>> out the one in my supply to protect the grid from burning up in the event 
>> plate voltage doesn't come on or drops off without kicking out the grid 
>> voltage relay.
>>
>> I looked on various schematics on K4OZY's web page, again not finding a 
>> part number such  as this in any parts listing.  I even printed out a new 
>> copy of a PS-4 which is totally different than the schematic i have with 
>> my books.  Unless i pull that beast out of the rack i'll never know which 
>> version i really have.
>>
>> Anyone have any info on the C708 cap?
>>
>> Larry
>> W0OGH
>>
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