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Micor Base Station Battery Backup Circuit

Jim Cicirello

#46337

"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

Maire Company

#46338

it is done with a special power supply made for that use.

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----- Original Message -----
From: "Jim Cicirello" <ka2ajh@...>
To: <Repeater-Builder@...>
Sent: Monday, January 10, 2005 10:53 AM
Subject: [Repeater-Builder] Micor Base Station Battery Backup Circuit

"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
Yahoo! Groups Links

Eric Lemmon

#46355

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:

toggle quoted messageShow quoted text

"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
Yahoo! Groups Links

Wade Lake

#46358

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

toggle quoted messageShow quoted text

----- Original Message -----
From: "Eric Lemmon" <wb6fly@...>
To: <Repeater-Builder@...>
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
Yahoo! Groups Links
Yahoo! Groups Links

Kevin Berlen

All Messages By This Member

#46359

Jim,

I have an original manual that shows the mod for the TPN-1106A
to add the battery charger/revert circuit board. I will try to scan it
and get it to you one night this week. 73,

Kevin, K9HX

toggle quoted messageShow quoted text

At 10:53 AM 1/10/2005, you 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
Yahoo! Groups Links

Neil McKie

#46361

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:

toggle quoted messageShow quoted text

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" <wb6fly@...>
To: <Repeater-Builder@...>
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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