Search eBay for "ubiquiti passive poe" and you'll find an inexpensive DC injector <$5.  I use it successfully to power a roof-mounted Bullet installation (Conrad, KG6JEI mentioned it earlier in this thread).  I've attached a photo.  You'll see the CAT5 cable that connects data and power into the Bullet.  The antenna is attached directly via the 90 degree adapter provided with the Bullet.  This happens to be the Titanium version which I paid $114 for, but I could just as easily have used the plastic-cased version which sells for $74.

Andre, K6AH

Attachments
 Bullet Installation.jpg [359 KB]

Yep, I was too, but I decided to spend the few buck and try them. They work fine for my needs.  They probably don't support Gigabit Ethernet (which you would need if the UBNT devices jump to the 40 MHz-wide channel (110 Mbps)... which they will do under the right conditions).

Anyway, there's a domestic importer who resells them.  I think I decided to buy from him rather than chance the Chinese-direct connection.  I hear your concern about letting the smoke out of these devices.  I would always verify the correct power polarity is on the correct pins before plugging it in.

Andre, K6AH

Yep, always wise to verify polarity before attaching a device just to be on the safe side.

All these POE injectors are is a power inlet, with traces to the correct pins to feed power up the line. Nothing fancy at all, no electronics in them usually just traces and an inline LED and current limiting resistor at most.

10/100 is all these type of injectors but that is also what the ethernet ports on these devices are, 10/100.  Gigabit ethernet speed isn't a concern with the vast majority of the Ubiquiti gear unless you start talking about AirFibre line.

Passive POE is actually restricted to 10/100.  In Gigabit the 4 extra wires that passive POE uses are actually used as part of the datastream and you have to start supporting a more active power delivery options.

Please don't call the "passive" power over cat5 adapters "Power over Ethernet" or PoE. 

PoE/Power over Ethernet is a specific standard requiring different voltages and active handshaking and power management. 

Calling these pseudo PoE adapters "PoE or Power over Ethernet" will confuse people and lead to damaged equipment or at least non-functional setups.  Real PoE has protection built in to not put voltage on the cables until after it handshakes with the device on the other end and finds out the device can handle it.

Even if YOU know what you're talking about when you misuse the term, the people who aren't already experts don't need to confused by wrong terminology.  This stuff is already confusing for the newbies as is.

For that matter, be careful using these pseudo PoE connectors in a site where someone other than you might be working on the wiring or equipment.   That's a bit like putting 220V on a 110V wall jack. 

Picked up a cheap Linksys WRT543G3-ST on ebay. I could not get the WRT543G3 firmware to load on it. Just got the generic "Failed" pop up screen.

KB9ZMR,
Please take time to read the forum and posts and/or do research before making a claim like that. There are five versions of that router (WRT54G3G/WRT54G3GV2 Mobile Broadband router). Earlier posts in the same category on this forum (Page 4 & 5), show how to get the WRT54G3G-ST and WRT54G3G-AT to work. The firmware located on the homepage is only valid for the WRT54G3G (non-ST, AT, EU, or V2-VF). With that said, do not expect it to work with any other derivative of the WRT54G3G series.

Search doesn't seem to search the forums.  Use Google advanced search instead.