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Author Topic: Motorola Power Supply ??s  (Read 270 times)
N4ZYV
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Posts: 90




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« on: October 01, 2006, 04:32:41 PM »

I have been given a Motorola Model HPN 1005A power supply.

Can anyone here tell me the amperage capability of this unit? Its presently wired for 120v with a 5amp fuse. In the meantime, I'll keep looking on my own.

Thanks
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K5LXP
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« Reply #1 on: October 01, 2006, 07:34:20 PM »

The easy way to tell on these units is to look at the heatsink and count the pass transistors.  If it's one, it's a ~7.5A, if it's two, then ~15A.  These supplies tend to be on the high side for output voltage, I usually change the reference zener one step which sets it right at 13.8V.  The 15A ones are kind of light to run a 100W HF xcvr but are perfect for V/U mobile rigs.  Even the smaller version is capable of running most mobiles.

Mark K5LXP
Albuquerque, NM
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N4ZYV
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« Reply #2 on: October 03, 2006, 07:14:45 PM »

Thanks. I was thinking about 15a due to the 2 pass transisters but didn't want to push it to smoke to find out. I have not been able to find out any more info, but this basically confirms what I was thinking.
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