Any idea what this unit came out of or it's current rating? TPN1094A - Motorola Base Power Supply. I don't have it in front of me at this time. I've checked mot.com and googled for it and any variations, including just TPN1094 with no results indicating what it's good for.
Thanks!
TPN1094A???? Motorola Base Power Supply: Any clue?
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I found a limited bit of info, and I claim no responsibility for it's accuracy: 13.5vdc 6a, aquired from here: http://isp.trib.com/~rollo/POWER.html
Not your best power supply that Motorola accually built.
One clue, does it have one or two T03 transistors in the heatsink.
One T03 transistor was good for 6 to 8 amps. These are getting realy old and the electrolytic cap on the rectangular circuit board dries up and allows a lot of ripple,,hum, out of the box.
Another important item, they were set to put out from 14.4 to 15.5 volts from the factory, that is way too much for most radios rated at 13.4 volts vehicle battery supply.
Typically used in the base station option for Mostar, Maxtrac, Spectra, Maxar, & ect.
One clue, does it have one or two T03 transistors in the heatsink.
One T03 transistor was good for 6 to 8 amps. These are getting realy old and the electrolytic cap on the rectangular circuit board dries up and allows a lot of ripple,,hum, out of the box.
Another important item, they were set to put out from 14.4 to 15.5 volts from the factory, that is way too much for most radios rated at 13.4 volts vehicle battery supply.
Typically used in the base station option for Mostar, Maxtrac, Spectra, Maxar, & ect.
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richyradio
- Posts: 83
- Joined: Fri Dec 13, 2002 1:52 pm
if we are talking about the supplys that ran maxars, etc they are not that bad- also used in consolette base stations...they made various models that went as high as 27 amps...(that one was for the motorola micom series) greeenish colored heat sink, 2 pass transistors on it....on the higher current ones, they actually regulated the "negative" side, if you will....this allowed them to eliminate the mica insulators on the xsistors to better pass the power dissapated by them...they also kept the unregulated side a little lower in voltage than most mfgr's do, to further decrease dissipation (and use a half-wave rectifier as these don't sag as much as a full wave under load) there is an internal voltage set pot, but if you adjust it you may find all of a sudden you popped the fuse- it uses a rheostat, which get real noisy w/ age.....when you adjust it, it'll jump up to around 16v which will cause the internal crowbar to fire, popping the fuse....the later models of this supply eliminated this circuit as it was nothing but trouble for motorola... if you see holes on the chassis in the shape of a to-3, you have a "newer" one....before powering up supply, twist this pot back and forth a couple of times (and then some!) then plug in (with no radio hooked to it!!!) and set voltage.......not really a bad supply, considering it's age....again, that is if we're talking the same supply!