[NHRC-user] NHRC-5 with battery backup

[Jay Lovelady]

Jim:

Thanks very much for your reply and suggestion.  That seems like a very
simple way to do what I am suggesting.  I just wanted to run things like
this by others before I start throwing voltage into the accessory
connector.

Any particular diode type that you could suggest?  I would also be
interested in hearing any other ideas on how to make this happen.

73
Jay, KD4BPZ


On Wed, October 7, 2009 10:31 am, w5zit at aim.com wrote:

>  One thought is to simply hook the input that you want to 'pull to ground'

> to the output of the AC power supply.? I would take a look at the input

> and see what the resting voltage is, and if it is less than +12 VDC I

> would put a diode in series with the output of the AC supply so the 12

> Volts would not be applied to the input when the AC supply was active.?

> But when the AC goes away, the output of the AC supply would go to ground

> and pull the bar end of the diode to ground and thus pull the input to

> the controller to ground.

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> 73 - Jim? W5ZIT

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> -----Original Message-----

>

> From: Jay Lovelady <jay at fieldcomm.org>

>

> To: nhrc-user at nhrc.net

>

> Sent: Wed, Oct 7, 2009 6:30 am

>

> Subject: [NHRC-user] NHRC-5 with battery backup

>

>

>

>

>     Greetings to all:    This is my first post to the list.  I've been

> thoroughly enjoying getting  to know a NHRC-5 controller that I

> purchased a couple of years ago, but  have finally been in a position

> to get operational.  It has been lots of  fun and learning.    I'm

> trying to configure the repeater to switch courtesy tones when the

> repeater goes onto battery backup.  Switching to battery is handled by

> a  surplus Samlex BBM-1225.  It handles seamless switching and

> charging of  the battery.  In the past we used a Motorola controller

> that would sense  the loss of voltage from the power supply, and

> change courtesy tones to  alert users to keep it short.    I see that

> EXP3 and EXP4 can be used to change courtesy tone, but I am a  little

> confused on how to use them.  I see that they need to be "pulled to

> ground" how exactly to do that is where I am stuck.    Any thoughts

> would be appreciated.    73,  Jay - KD4BPZ

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