Turn the diode around so it points away from the tap point. Then if there is any load on it less than a megohm or so, it will be 0 volts when COR goes low. Might have to hang a resistor on the output of the diode, say 10k to 50k. Think of it as a diode "and" gate we learned about in tech school eons ago.
Al, K9SI > Date: Tue, 30 Mar 2004 15:30:21 -0800 > From: Ken Arck <[EMAIL PROTECTED]> > Subject: RE: WTB: 440 Mhz Receiver with COR > > At 06:55 PM 3/30/2004 -0500, you wrote: > >Try putting a small silicon diode or two in series with the wire. That > >should drop you about .6 volts each or so and take you more to 0. > > <----Huh? That would simply exacerbate the problem by placing yet another > .6 volt above ground reference in series with his COS lead. > > Ken > > -------------------------------------------------------------------------- ---- > President and CTO - Arcom Communications > Makers of state-of-the-art repeater controllers and accessories. > http://www.ah6le.net/arcom/index.html > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > > ________________________________________________________________________ > > Date: Tue, 30 Mar 2004 19:17:57 -0500 > From: "KC1RM" <[EMAIL PROTECTED]> > Subject: Re: Re: WTB 440 Mhz Receiver with COR > > If you put a diode in the COR line with the cathode toward the tap point, > doesn't this raise the voltage? > > I think the voltage on the anode would be 0.5 plus the diode drop- > > Jim, KC1RM > > ----- Original Message ----- > From: "Al Wolfe" <[EMAIL PROTECTED]> > To: <Repeater-Builder@yahoogroups.com> > Sent: Tuesday, March 30, 2004 5:51 PM > Subject: [Repeater-Builder] Re: WTB 440 Mhz Receiver with COR > > > > Mathew, > > Maybe all you need to do is stick a small diode in your COR line. The > > silicon ones typically drop about 0.6 volts. Maybe that's enough to do the > > trick. Try a 1N914 or that genre. > > > > Al, K9SI > > > > > > Date: Tue, 30 Mar 2004 09:07:44 -0800 > > From: Mathew Quaife <[EMAIL PROTECTED]> > > Subject: Re: WTB: 440 Mhz Receiver with COR > > > > The voltage at the tap point is about 7 volts, when keyed it drops to about > > .5 volts, just not enough to get it to key the controller. I looked for > > other sources in the radio, nothing would drop to zero volts. > > > > Mathew > > <snip> > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
