You might also look at
http://www.repeater-builder.com/astron/astron-rsbattmod.html
for a modification on how to use your Astron RS Series Power Supply
for battery charging.
In regards to the Motorola TPN1106A (or TPN1105A) Power Supply is
really convenient for both charging your standby battery and
supplying your radio system with 12 DC power.
Have one in operation at the repeater site ... and three more for
spare parts. Found the extra three at swapmeets.
Hope this helps,
Neil - WA6KLA
Wade Lake wrote:
>
> Those Motorola Power supplies that have the battery back-up
> feature are really cool, unfortunately, they are also kind of rare
> and expensive (unless you luck out at the swap meet or on e-bay).
>
> A friend of mine and I designed a very simple circuit to
> modify the Astron 20A Power supplies to do this job. Obviously
> this could be done on any power supply but the Astron 20A is common
> and inexpensive and they leave enough room to put this all inside
> easily. The first thing you will need is an A.C. operated relay.
> Radio shack has one that we chose simply because they are cheap,
> $8.00 and the contacts are rated high enough to handle the 20 Amps.
> It is RS P/N 275-0217. The contacts are rated for 10 Amps but
> since this is a double throw type, both "throws" can be tied
> together. I drilled another hole in the rear of the Astron to mount
> another binding post for the battery connection. The relay coil is
> connected directly to AC power coming in, the contacts are wired to
> the 13.8 VDC output wire so that when the relay is energized, the
> power is routed though the relay from the power supply to the output
> binding post, the output binding post being wired to the "throws" of
> the relay. When AC power is lost the relay deenergizes and these
> contacts of the relay are wired to the backup battery. That takes
> care of isolating the battery from the power supply, the only thing
> left is a simple charging circuit. To accomplish this, an 8 Ohm, 25
> Watt resistor from the relay "throws" to the battery contacts was
> added. This only allows for trickle charging, but as the battery
> voltage approaches the supply voltage, the current "self regulates"
> to almost nothing. Also, since AC power is present 99.9% of the
> time trickle charging in this way is not a problem. This does the
> job nicely.
>
> We have done this mod to 2 different repeater systems with
> excellent results, and no failures of the backup system. Not as
> easy as buying a power supply ready for the task, but still easy to
> do and I would bet, usually less expensive.
>
> Hope that helps
>
> 73, Wade- KR7K
>
> ----- Original Message -----
> From: "Eric Lemmon" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Monday, January 10, 2005 6:47 PM
> Subject: Re: [Repeater-Builder] Micor Base Station Battery Backup
> Circuit
>
> >
> > Jim,
> >
> > The TPN1106A is one of a few Motorola MICOR power supplies that
> > are designed to float-charge either NiCd or lead-acid batteries
> > for emergency backup. There is an internal pot to adjust the
> > voltage for the chemistry of the battery.
> >
> > When the TPN1106A power supply is used, the battery is connected
> > directly to the same terminals that feed the PA. You cannot do
> > this with other power supplies, because the battery may discharge
> > back through the power supply during an outage, possibly damaging
> > the power supply.
> >
> > The complete details of the TPN1106A power supply and the battery
> > protection and alarm system are contained in a 32-page manual
> > 6881104E92, which is still available from Motorola Parts.
> >
> > 73, Eric Lemmon WB6FLY
> >
> > Jim Cicirello wrote:
> > >
> > > "Happy New Year"
> > > I am looking for a print or detailed description of how Motorola
> > > hooked their Battery Backup Circuit into the Micor Base/Repeater
> > > Power Supply. I found a schematic on repeater-builder 1106.jpg, but I
> > > didn't get a good print out on my end. I remember seeing a portion of
> > > a service manual that had the circuit, but as luck would have it my
> > > manual does not have the circuit. Any help would be appreciated as
> > > always.
> > >
> > > 73 JIM KA2AJH Wellsville, New York
> > >
> >
>
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