I’m really starting to get worried. R52H failed yesterday on a tower install. It had been running great for 5 months. Most of the failures have happened in a few days of install though. It looks like about 10% failure rate.
Almost all of them are in Rootena (R2T58W-19) installs in RB133’s.
None are going to Omni’s, as talked about in previous posts.
Any idea’s?
We just received 10 defective R52Hs, right out of the box … the best one had a signal strength of 29mW. 
I’ve NEVER had issues before with MT hardware. Have any idea about warranty / RMA’s?
How do you test cards when you receive them new? Equipment, software, setup, etc? I have no clue and i’d hate to get a radio setup and up a roof or tower or wherever to find out it does not work well even if it does in the office right after being set up…
could anybody enlighthen me please? 
Nemecio.
Up until this point, I’ve not really tested prior to install… When we first began working with MT, we tested setup’s on the test bench with some small patch antenna’s.. Then we developed the standard setup for AP’s, Backhauls with WDS bridges, Client CPE’s with NAT, and Client CPE’s with WDS bridge. I’ve got a backup file for each that we ftp to the new board, then go in and restore, then setup the wireless settings which don’t restore.
I do have extra coax going from test bench to roof antenna that connects to a nearby AP, and use it for testing coax jumpers etc… and now we use it to test suspected bad radios.
Are these radios being run with default TX power?
Has it ever changed from anything besides default even for a few seconds?
I used to change them to fixed at 26, but more recently, I’ve left them at default.
I used to change them to fixed at 26
There you have it. Overdriving cards will blow them every time.
First off, it was unclear whether the default power setting actually worked in earlier versions of MT. However, we did start leaving it at default in later versions.. The cards STILL FAIL with default settings.
Second, the power output rating on the R53H is 350mw… There YOU have it.
I have not found any single factor across all the failures.. One was in RB133 with long CAT5 and 18v POE, so I thought it might have been insufficient power.. So we’ve only used 24volt since then, and all of the subsequent failures have been short CAT5 runs.
350mw is less than 26dBm. Do the math.
Yes 398mw. But then again, that also depends on whether the card was actually transmitting at 100%. That’s why when the radio is idle there is low power draw by the radio. In fact, at idle, there is close to 0 mw coming from the output.
Having ###holes on the forum gets us NOWHERE.
But then again, this has gotten off thread… I’ve made the point that the 26dbm setting (mainly used in early SR5 days) hasn’t been used in a long time, changed after the first few failures.. The failures CONTINUE.
The diversity chip referred to elsewhere seems to be the question mark. Does anyone that has any USEFUL knowledge of the R52H care to comment?
Call me what you want. It’s not my fault nor Mikrotik’s that you are too stupid to read the manual and understand if you overdrive a cards power - even for a short amount of time you will blow the card.
If you have doa cards out of the box that is life. We’re dealing with ESD sensitive devices - it happens.
Five months and it quit working? Did you overdrive the power? Are you using a polyphaser on your antenna? Are you using shielded CAT5? If so, is it grounded to the same ground as other equipment and most importantly the tower? Are you using a CAT5 surge protector?
There are a hundred reasons why failure occur. Copping an attitude and blaming MT for your stupidity just make the MT guys and myself sit back and laugh - it keeps the forum lively.
I originally posted the message about getting 11 out of 15 R52H cards DOA about 4 weeks ago. We stopped using them right then.
All of our settings were left default (and always have been for the last 6 years using MT). Mikrotik has a QA problem with these cards right now. We even had 1 fail on a tower that had been working for 2-3 weeks, with all power settings at default.
How are you going to blame MT for something that has been working for 2-3 weeks?
I have 5 x Gigabyte minipci with 19dBm default power and they are working fine at 23dBm. My opinion is that R52H are low quality cards.
There is definately something up with them.. Since around the 1st of the year, the default tx power setting has been used, and the failure rate has increased. A problem that we never had with R52’s or SR5’s and XR5’s.
Sure, the one that failed on a tower after five months may very well have been attrition, although we usually only have those problems with severe lightning etc…
My question is whether it’s something with the Rooteena. Our environment is very windy- maybe a static problem that no other cards have been affected by.
I’m not blaming anyone.. There may be a logical reason for the failures. We just need to know as there are probably 100 installed now.
Because it should last longer than that. If you bought a new car and the transmission went out after 1000 miles, would you blame the dealer?
No offense, but you seem to be the one who have the attitude lately. Don’t get me wrong, you have many many very good posts on here which have been very helpful for users, but lately I have noticed an extremely high number of posts from you which simply say “read the manual”. Not really helpful… Yes, people could do a better job of asking questions, but you can simply say, give us more info so we can help.
At any rate, randallr has made it clear that they have not changed the power from default for a long time, so I would say it’s time to drop the “you screwed it up” theory.
Again, don’t take it as me yelling at you… just saying you can ease off a little… Be cool! 
Joe
Ok, I will re-phrase.
What is your exact setup end to end including what type of power supplies, routerboards, grounding, surge protectors, poly phasers, etc?
jwcn,
Saying someone doesn’t know what they are doing instead of looking at a possible problem shows YOUR ignorance… You come across as a real know-it-all who has everything perfect. May your karma bite you in the a… Now for our experience in the R52h debacle… We have a stack of 10 r52h’s that have failed on the bench and in the field. There are two failure modes. Most often it looks like the antenna switch blows due to something we suspect is static discharge. This has been with 12V battery power, 12V poe, 24V poe, whatever… They were very well grounded to common grounds. Some had polyphaser discharge protection. We have done everything we could to protect them. In the very same box and on some of the very same boards, SR5’s have shown no problems. We have also seen R52H’s with blown amps. Blown as in a small hole in the amp where they exploded. The three that this happened to all experienced antennas that were swung off line ( 90+ mph bent the brackets twice and ripped it off the wall once ). It’s like the amp tried to compensate for the slowly changing signal and went farther than it should have. We now are off R52h’s Back to Ubiquiti for highest power and trying the engenius for a little less.
I don’t claim to “know it all” I do have ample experience making the same stupid mistakes.