[App_rpt-users] GM300

Bill Hurlock bill.hurlock at cpcomms.com
Sat May 11 17:08:08 EDT 2013


I rigged a solenoid connected to a knife switch and all is well. Just that banging noise when someone keys up on the channel.

Bill Hurlock

From: Jim Duuuude [mailto:telesistant at hotmail.com]
Sent: Friday, May 10, 2013 5:32 PM
To: Steve Agee; app_rpt mailing list
Subject: Re: [App_rpt-users] GM300

Just a suggestion in general:

We are ham radio operators. By definition, we have, at least, a certain basic knowledge of
electronics (as is required to pass our test).

If two devices are somehow electrically incompatible with each other, use your knowledge of
electronics to build a simple circuit to interface them together. Converting from one set of
"levels" to another is REALLY not that difficult.

That's why we are what we are, and do what we do.

Jim WB6NIL

P.S. Or, you can use pin 8  *LIKE EVERY ONE ELSE DOES*!!


> From: n5zua at earthlink.net<mailto:n5zua at earthlink.net>
> To: app_rpt-users at ohnosec.org<mailto:app_rpt-users at ohnosec.org>
> Date: Fri, 10 May 2013 16:14:00 -0500
> Subject: Re: [App_rpt-users] GM300
>
> <http://www.batlabs.com/images/gmacc8.gif>
>
> Gotcha. Not sure if you mentioned if yours was a 16 channel or not. If an 8
> channel, the above link lists pin 4 as a spare, and instructs that pin 8
> should be used for COR active low. Since you mentioned getting voltage out
> of pin 4, I'm assuming yours is a 16 channel radio. Folks with an 8 channel
> model would not have the option you are using.
>
> N5ZUA
>
> ----- Original Message -----
> From: "Bill Hurlock" <bill.hurlock at cpcomms.com<mailto:bill.hurlock at cpcomms.com>>
> To: <app_rpt-users at ohnosec.org<mailto:app_rpt-users at ohnosec.org>>
> Sent: Friday, May 10, 2013 3:54 PM
> Subject: Re: [App_rpt-users] App_rpt-users Digest, Vol 51, Issue 9
>
>
> > Here is a clip about PIN 4 in the Accessory plug of a GM300.
> >
> > 4 Programmable Output Only This is a radio output port. It is an open
> > collector output which saturates to A+ supply when active. It is normally
> > used to drive an external relay or sense lead. It duplicates the function
> > of J3-3 of the five pin logic board. When active it can source a maximum
> > current of 250 mA.
> > The pin has a 10 K ohm resistor pull-down to ground on the logic board.
> > and uses a PNP transistor to switch it up to 12V. This pin does not work
> > as an active low pin (i.e. pulling something to ground), only as an active
> > high (that is dragging something up to +12v). If you want an active high
> > output to drive a reed relay which has the other side of the coil to
> > ground, this is your pin (but don't forget to check that the backwards
> > diode is present on the coil pins).
> >
> > Bill Hurlock
>
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