If you decide to go with the relay, remember to compensate for the inductive
kick when relay coil circuit is opened. Use a diode across the relay coil
with the cathode side towards the +12 source.
Jim wd4air
>From: "Carl Moreschi" <n4py@arrl.net>
>Reply-To: Carl Moreschi <n4py@arrl.net>,Discussion of Ten-Tec Equipment
><tentec@contesting.com>
>To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>Subject: Re: [TenTec] Orion Question
>Date: Thu, 30 Mar 2006 11:01:10 -0500
>
>The biggest difference between using a relay and a transistor is the time
>it
>takes to do the switch. A transistor will switch in a few microseconds. A
>relay will take in the order of 10 milliseconds to do the switch. It all
>depends on what you are trying to do with this if the relay is fast enough
>or not.
>
>Carl Moreschi N4PY
>121 Little Bell Drive
>Bell Mountain
>Hays, NC 28635
>----- Original Message -----
>From: "Grant Youngman" <nq5t@comcast.net>
>To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
>Sent: Thursday, March 30, 2006 10:44 AM
>Subject: Re: [TenTec] Orion Question
>
>
> > > Grant, wouldn't a simple 12vdc relay work in this case? Why
> > > would I need a transistor? OR is it because the logic is
> > > reversed? (in that case, use the opposite N.O. poles)
> >
> > I think that would work just fine. Just run +12 (or +5 or whatever)
>through
> > a current limiting resistor in series with the relay coil and connect
>the
> > other end of the coil to a TX OUT line. That will energize the relay
>when
> > the Orion goes into transmit and pulls the TX OUT line low. And a N.O.
> > contact can switch the voltage you want to control.
> >
> > Grant/NQ5T
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
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