[NJARC] Old Battery Question

[John Ruccolo]

Hi Scott,

This thing sounds like an interesting piece of vintage gear, HOWEVER, I'm not sure I would use it to troubleshhot your BC-348. Why? Because it's almost certainly going to need some troubleshooting of its own.

I know you like military stuff -- get yourself a good reliable RF generator like the URM-25D or F. I personally like the HP-606A or B better,
but that's just me. I have one that was used by the Navy, even though unlike the URM-25's it wasn't built specifically for military use. Or, a more modern RF generator is fine, of course.

Anyway, a while ago I made some suggestions on the reflector (so did othera) about how to start troubleshooting the 348. I never heard anything from you. One thing I've learned the *hard* way is that it is *not* always easy to try to troubleshoot a radio via email.

OK, the set doesn't work. Either start at the antenna with an RF test signal and move forward, or start at the audio output stage with an audio test signal, and move backward. Also, we had some suspicion that your B+ voltages weren't right (a strong possibility). What happened when you measured those?

Anyway, good luck and let us all know your progress. 

HAPPY THANKSGIVING TO ALL!

Regards,

John



--- On Thu, 11/27/08, Scott Roberts <ng19delta at yahoo.com> wrote:

> From: Scott Roberts <ng19delta at yahoo.com>
> Subject: [NJARC] Old Battery Question
> To: "NJARC Radio Club" <njarc at mailman.qth.net>
> Date: Thursday, November 27, 2008, 2:16 AM
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Ok, battery guru types, here is a question for you- I just
> received a Weston 665 (I-56-A)set analyzer, and discovered
> it uses two Burgess 7 1/2 volt batteries, #5540, and
> arranged with 5 terminals, labelled "+", "-1
> 1/2", -3", "-4 1/2", and "-6".
> The batteries both state "Install Before May
> 1965", and are in really great looking shape! The neat
> thing is, they also both have about a 75% charge each!
> 
> Now, 75% is nice, but I am sure readings will suffer for
> it. I could probably adapt a 1.5 "AA" cell in line
> for each, to bring required voltages in line, but I was
> thinking of a long term solution: Can I put together two
> sets of batteries, each of 5 cells in series, and tap off
> them at the required locations, as it appears is the
> original construction here? Or is there more I need to know?
> I mean, if I link the 5 cells in series, and have one
> providing the positive terminal, if I go over two cells(from
> the positive), will I get -3VDC, and if I go over 4, will I
> get -6VDC? I may try some experimenting here, but I think it
> may work.
> 
> Comments?
> 
> I am hoping to use this set to analyze the BC-348P which is
> trying to drive me nuts... I actually have the proper manual
> for the analyzer set, and can extrapolate how to set it up
> for my particular needs...
> 
> Thanks!
> Scott
> 
> 
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