Powering Ubiquiti links from 12v

So it seems that I can power a Ubiquiti Bullet and Rocket directly with DC 12v. In the past I have been chasing POE and wasting precious milli-watts converting 12V to POE standard (Usually 24v or 48v) then powering the devices.  A power saving can be made by connecting direct to 12V. If using a solar setup, the power savings can mean more up-time, and better use of your batteries. Some testing will follow this blog post. However in the interim, it seems pretty stable here in the workshop.


How to make your own cable for 12v power supply.

  • RJ-45
  • RJ-35 Crimp
  • Pliers
  • Box Cutter
  • Straight through Ethernet cable

In a nutshell, the Ubiquiti Bullets and Rockets grab power from 4 pins on a standard RJ-45 connector. In our case here in Australia (Blue/White-Blue) pins 4 & 5 will carry 12v+ and pins 7/8 12v-.


Prepare your cable

If you have the resources to cut up a straight-through cable, then go ahead and cut one end off. (Otherwise you will have to complete two terminations) Strip the cable back a bit to expose the pairs of wires. Identify the solid blue and Blue-White wires. These will be your 12V Positive injection points. Now identify the Solid Brown and Brown-White wires. This will be your 12V Negative injection point. From here identify the remaining cores and insert them into an RJ-45 housing.

  • PIN 1 – White-Orange
  • PIN 2 – Orange
  • PIN 3 – White-Green
  • PIN 6 – Green

Now crimp your RJ-45 and you are all done. The bare wires can be used in anyway to inject 12v. ie Barrel jack. I would use a fuse close to the source to protect your equipment. Also confirm the pinouts prior to plugging in. The last thing you want is to fry your Ubiquiti gear.


Or Don't hack up a cable and buy some injectors

If you want that more professional look, then you can always purchase a few of these injectors. Have a look at the specs though and make sure the power inputs are on pins 4/5 and 7/8. Let me know how your setup goes? I really need to do some testing on the longevity of this type of setup. My only concern is that the fluctuating 12v from batteries could damage the Ubiquiti gear over time. Maybe I need to look at a circuit to provide clean power.



The Scott Bonnar 45 Project

Have you ever just wanted to get the boys (and girls) away from the PS4 for a while? well I think I found the solution… My son and I decided to give the whole “reel mower restoration” thing a go. After a bit of searching I decided upon the ever popular Scott Bonnar/Rover Model 45. It seems you can still find many parts for these suckers as well as plenty of donor mowers also if required.

We searched the ever faithful GumTree for a semi cheap donor mower and came across an old chap down the road selling the exact one we were after. A 17″ reel mower with the Scott Bonnar 45 stickers all over it. The nice, but old green paint job and oil stained Briggs and Stratton engine has us in awe. I gave it a quick test cut on the lawns and we purchased it on the spot.

Without looking too close, we probably should have checked it a bit more thoroughly. It seems that these mowers have a bit of a problem with the horizontal supports for the engines. Over time the engine mount holes get cracks in them and this can spell disaster for any home restoration project. The good news for us however that after a complete strip of the engine we had zero cracks and the restoration was good to go.


Some History on the mower

Thanks to ‘Bonnar Bloke’ from the Outdoorking.com forums we were able to get this little piece of history on this particular model of Scott Bonnar 45 mower.

“Well that’s one of the early made “Eagle Farm” Scott Bonnar’s after Rover closed the Holland Street Thebarton Factory in Adelaide the previous year. Your mower was assembled in early (March) 1984 with the Engine being made on the 6th of December 1983 over in the US of A.”

“It’s a rather interesting example as the ID plate is of the first batch of green metal plates that doesn’t refer to Brisbane as the city of manufacture. The later ones do, before they changed to silver foil style ID stickers. Also this mower shows evidence that they had not commissioned their new state of the art “Powder Coating line” yet which introduced the Kermit Green coloured Rovers. So the Eagle Farm factory was still shooting Hammertone Enamel paint which was now a different colour than what was used in Adelaide (Apple Green)even though the 1984 Range of mowers brochure still showed the Apple Green colour as being current.”


Getting rid of the paint

So apparently back in the day powder coating was not a thing and the SB’s were painted with a Hammer-tone enamel paint. I can tell you that it is truly very stubborn to remove. Initially I used a sandblaster with the course garnet and it got rid of all the rust and crap. But the paint that was still good quality would not budge.

I then switched to the grinder with sanding pads, which worked pretty well. However all the small grooves proved to be a hassle with the grinder. The third method was to then use those wire brush attachments for the drill and after some time was able to bring the mower back to bare metal.


A new motor

The original Briggs and Stratton engine that came with the mower still runs, however it has seen its best days and I decided a retro fit was in order. Would you believe that you can get a direct replacement “Chonda” or Chinese Honda for $144 delivered? well you can’t really beat this and even if I get 5-6 years out of it I will be happy. The process of removing and replacing the engine is pretty straight forward. 4 mounting bolts, a throttle cable and thats about it.


Update - 29/11/17

So it has been a long time between drinks. Since I started the SB, I have moved workshops, got married and renovated some of the house. Also had a few other projects on the go recently. What I can say is that the SB is mostly stripped back and in primer. I still have parts everywhere, hopefully I’ll find some time to continue the build soon. Oh and I also purchased a “Daily” mower that has been keeping the lawn in good condition. It came with the original manuals! Check out the pics below for more details.


Work in progress

This post is a bit of a work in progress. I’ll keep updating it as we go with the resto. Wish us luck!