I have the above setup in and outdoor enclosure right now testing.
24v 600ma PoE (cheap kind) injector, 15ft cat5 cable.
2 xr2's to omni's doing "send" bandwidht tests on 2 different 2.4gig channels to 2 different rb 532 + SR2 Omni, Access point setups.
I always leave the R52 in freq. scan mode as i dont have a 3rd test unit to connect to..plus it still puts recieve load on the card, but clearly the r52 is not what im worreid about here in terms of power consumption.
its doing about 6mbit send to one AP and 4.5 mbit to the other...again this with the RB 133 generating the load..so, impressive. this is mainly a power / psu test as the XR2 PDF rates the XR2 @ 1.3A when used at any data speed on 802.11b (as opposed to g which uses less power). im using b for this reason.
so this is a lot of power load on the unit.
So far great! fast, (about 5 hours no issues... getting quite hot but thats expeceted.