[App_rpt-users] GM300

Bryan D. Boyle bdboyle at bdboyle.com
Fri May 10 17:44:26 EDT 2013


or even electromechanical...:)   Strowger switches arestill useful devices, even if outdated...;)

--
Bryan
Sent from my iPhone 5...small
keyboard, big fingers...please
forgive misspellings...



On May 10, 2013, at 17:31, Jim Duuuude <telesistant at hotmail.com> wrote:

> 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
> > To: 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>
> > To: <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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