Don,
I believe that you have an Option C28 Power Supply / Battery Charger
with the C29 "battery Protection & Alarm" option. Before you go
further, you should purchase the manual #6881104E92 from Motorola for
about $8.
The TPN1106A Power Supply differs from previous linear models in that it
is a switching power supply. It is more efficient than a linear supply,
and it produces no audible hum.
The wires you mentioned are part of the C29 option. A brown-black and a
black wire go to a normally-closed relay that shuts down the radio when
the battery voltage drops to a certain point where damage can occur.
The blue wire is an audio tone feed that connects to pin 22 on the F1 or
F1-PL control module. This causes a tone to be heard over the air when
the radio is on backup battery power.
Most of the early MICOR radios that included the battery backup option
used ten large (80 to 100 AH) nickel cadmium wet cells, and the power
supply was adjusted to 14.25 VDC in the Float position of the switch.
If lead-acid batteries were used, an internal pot had to be adjusted to
13.0 VDC in the float position. When a modern deep-cycle sealed lead
acid battery is used, the pot should be adjusted to maintain the float
voltage specified by the battery manufacturer. The equalize position
raises the voltage by about one volt, and is used only with wet-cell
nicad or lead acid batteries, but never with SLA batteries.
When you get you copy of the manual, make note of the fact that SMR-4945
changed the value of a zener diode to improve the reliability of the
TPN1106A power supply, and you probably should make that change.
73, Eric Lemmon WB6FLY
ka9qjg1 wrote:
>
> Can someone Please ID What the Wires coming out of the
> Motorola Micor
> TPN1106A
>
> 3 wires coming out by the 13.8 Amp terminal. and their
> use
>
> 1 Small 2 Ft Black
> 1 Small 2 Ft. Brn/Blk
> 1 Larger Blue Shielded with a push on lug
>
> I Have a another Power supply like this and it don't have
> this This,
> one has the wires with the plug
> that gos on the Bottom of the Micor Backplane.
>
> What is the Switch Equalize and Float for If I was not
> using a
> battery backup ?
> also the Pot marked Tone Lvl
>
> if I decide to use the Backup is it safe to use a Battery
> setting in
> the bottom of a 6 Ft rack
> inside the Radio Room at home .
>
> Thanks Don KA9QJG
>
>
> Yahoo! Groups Links
>
>
>
>
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