[aprssig] Kenwood TR-7730 backup battery?

Steve Noskowicz noskosteve at yahoo.com
Sat Apr 20 10:51:14 CDT 2013



The link in the upper left of the page below has a slightly better schematic.  It is in the upper right of the schematic right at the power input, but someone added a mod and the otiginal is obscured.  However, it appears you may be able to ohm it out.  
One pin is ground and it may be that the other three are plus, but it's hard to tell.  A better schenatic will tell.

http://elektronicsstock.blogspot.com/search/label/TR%207730#!/2011/04/schema-kenwood-tr-7730.html


73, Steve, K9DCI  USN (Vet)  MOT (Ret)  Ham (Yet)

--- On Sat, 4/20/13, Steve Noskowicz <noskosteve at yahoo.com> wrote:

> From: Steve Noskowicz <noskosteve at yahoo.com>
> Subject: Re: [aprssig] Kenwood TR-7730 backup battery?
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Date: Saturday, April 20, 2013, 10:43 AM
> 
> 
> Mods.dk probably has it.
> Also...
> Please remember that Google is your friend:
> 
>   try Google "kenwood tr-7730 service manual"
> 
> BUT BE CAREFUL.  On some sites the big, obvious
> "DOWNLOAD" buttion is for something else.  The real
> download is in "fine print" somewhere else:
> e.g. this operator's manual:  http://elektrotanya.com/kenwood_tr-7730_sm.pdf/download.html
> 
> Poor resolution Schematic:
> http://elektronicsstock.blogspot.com/2011/04/schema-kenwood-tr-7730.html#!/2011/04/schema-kenwood-tr-7730.html
> 
> 
> 
> 
> 
> 73, Steve, K9DCI  USN (Vet)  MOT (Ret)  Ham
> (Yet)
> 
> Up to date APRS Beginner Guide - updated Oct-2011
>   http://K9DCI.home.comcast.net 
>     Click 'APRS Beginner INFO' under Contact
> 
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> 
> --- On Fri, 4/19/13, Greg D <ko6th.greg at gmail.com>
> wrote:
> 
> > From: Greg D <ko6th.greg at gmail.com>
> > Subject: [aprssig] Kenwood TR-7730 backup battery?
> > To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> > Date: Friday, April 19, 2013, 10:54 PM
> > Hi folks,
> > 
> > My packet station and iGate runs on an old but quite
> > serviceable Kenwood TR-7730.  The rig has a connector
> > in the back for a backup battery, but none is present,
> so
> > any momentary glitch in power send it back to
> > defaults.  I have not been able to find a battery,
> nor
> > the pin-out and specs to fashion one of my own.
> > 
> > There appear to be 3 pins in a triangle formation. 
> > Anybody know what the spec is?
> > 
> > Thanks,
> > 
> > Greg  KO6TH
> > 
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> > aprssig at tapr.org
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