This thread has been useful for some other projects I have going at the moment. I think the "proper" way to do this is to power the Pi from a 12V source and a buck converter. There are any number of 12V pwrgate doo-dads that you could make to handle the UPS side. I found this on Thingiverse that is not only a Pi case but also has a buck convertor too .... https://www.thingiverse.com/thing:2286741 

I think this is the way I'm going to go for my node rebuild. I'm going to do this Pi setup and one of these http://www.repeater-builder.com/products/usb-rim-lite.html for a spare Motorola SM50 down at the farm. It'll be solar powered with a WiFi connection back to the office. The whole lot will be mounted on some 3/4 plywood on the barn wall. I'm building one of those 18650 Tesla type battery packs to store the power. Should get about a week of run time just on the batteries.

Hello, Ramesh. Sorry I've been out of touch lately. I moved to Delaware 2 years ago after the wife threw me out. Been busy getting divorced and all that goes with that. Good news is that I have sole custody of my kids now and that things are starting to level out.

On Mon, Jul 10, 2017 at 3:56 PM, Ramesh Dhami <Ramesh@va3uv.com> wrote:
On 2017-07-10 1:03 PM, Carl wrote:
I have not used the buck converter linked below, but I have tried using a different buck converter to go from 12V to 5V for the Pi, and found it introduced an excessive amount of noise into the Pi (which carried over into the radio audio). Something to check as you develop your power scheme.
Carl

 <-- Hi Carl:  Absolutely, I have some of those converters from "CPT" and just as you describe, I found them to induce noise into the Pi / fob, which then get into the audio stream.  Not good!

My original plan was to use the Battery Bank (dual USB output) to power both the Pi and my Baofeng BF888s... but, in doing so, I get a humm on the TX audio out of the Baofeng.  When I move the Baofeng's over to a separate wallwart / USB charger, the noise goes away.

To Mark's question (Gee, where did you crawl out from? ;) keeping the Pi up during a power blip, etc., eliminates the need for someone to go to site to recycle power to the Pi.  Everything else, losing power, isn't such a big issue... just trying to keep the Pi somewhat immune to power blips.

Cheers!

Ramesh.

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