Skipp and others
The problem he is facing is really quite simple.
According to the service manual for the TKR-820,
the so-called "CO" output on the 15 pin Molex
style Accessory connector provides an open
collector output LOW when carrier is active
UNLESS the repeater is programmed for tone decode
in which case the CO output is "tone squelch"
based (I'm not sure if that means decode only
output or it is AND's with COR). In any case,
that's what the service manual says.
I spent a bit of time on the phone with Kenwood
tech support about this the other day and they
seemed somewhat "stumped" that it worked this way.
He sent me a couple excerpts from the service
manual, including this one (which may be the most
important piece of info from them so far - this
is from Service Bulletin T-89-88-LM)
I've posted it on our website (with Kenwood's
permission). This may be what Frank is looking for.
http://www.arcomcontrollers.com/rc210/t-89-88.pdf
Hope this helps
Ken
At 09:07 AM 5/1/2008, skipp025 wrote:
Re: TKR820 (tkr-720) COR Logic (pin13) information wanted.
Wow, this post has some history... y yo necesito mas practicar
en espanol Que Lastima! Read on.
The Kenwood TKR-720 and TKR-820 repeaters have a cor output
logic line with non-standard voltage values. The cor changes
dc level with cos however, the dc values are not standard in
the form of active high being some voltage and active low
going to dc ground (or the converse).
I designed and build a simple dc level detector circuit I
now use for all my repeater cor/cos and squelch detection
circuits. I've got the design down to one very fast adjustment
and it otherwise doesn't care what the input voltage values
are or where they transition to output a standard form-C type
relay or simple FET/bipolar transistor output.
It's a viable enough design that I'm having a fair number of
pc-boards made to be offered cheap to anyone who might want one
in kit or pre-built form. The time line for the project is at
least after Dayton and maybe into June.
But if you'd like to make your own you can contact me direct
and I'll try to help you with the proper information.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com
> "Private" <[EMAIL PROTECTED]> wrote:
>
> Ive been searching for that for abt a month now...Im running a 820
> with the Arcom Rc210 controller but, and I think u know what im going
> to say, lol....Wont keyup without COR...let me know if u fand
> anything out and Ill share with you.
>
> Frank
>
> --- In
<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com,
XE2SI <xe2si@> wrote:
> >
> > Hello Skipp, I am here in Tijuana, just across the border with San
> Ysidro, Ca.
> > Good it works for you. 73.....
> > Juan
> > ----- Original Message -----
> > From: skipp025
> > To:
<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com
> > Sent: Tuesday, January 11, 2005 8:31 AM
> > Subject: [Repeater-Builder] Re: TKR820 (tkr-720) CORlogic(pin13)
> informationwanted.
> >
> >
> >
> >
> > Just what the doctor ordered. Thanks Juan.
> >
> > Su respuesta trabajada muy bien. �Qu� estado
> > usted vivo adentro? Tengo familia en GTO, MX
> > Gracias otra vez mucho.
> > skipp
> >
> > > XE2SI <[EMAIL PROTECTED]> wrote:
> > > Looks that you have an old repeater, the new ones
> > > have that pin called TOR wich is what you want,
> > > if this is the case there is a small square island in the
> > > controller board near the IC11 ( pin 9 ), this
> > > change state when there is a valid "PL" received,
> > > maybe you will need a buffer for what you need.
> > > hope this helps.
> > > Juan
> > > ----- Original Message -----
> > > From: skipp025
> > > To:
<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com
> > > Sent: Monday, January 10, 2005 6:27 PM
> > > Subject: [Repeater-Builder] TKR820 (tkr-720) COR logic (pin
> > > 13)informationwanted.
> > >
> > > Hello there,
> > >
> > > Anyone have information to configure the COR output
> > > logic on the Kenwood TKR820 Repeater to ctcss only?
> > > I'd like to make pin 13 (COR) of the accessory
> > > connector change states with a valid received ctcss
> > > tone.
> > >
> > > As received, accessory pin 13 (COR) changes state
> > > with carrier squelch activity. This tidbit of knowledge
> > > seems to be a rather elusive animal. Maybe one of you
> > > has done this already?
> > >
> > > Thanks in advance for your reply.
> > >
> > > cheers,
> > >
> > > skipp
> > > skipp025 at yahoo.com
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
>
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