[hwh]

The auctions vary all the time, just search eBay for RFM22b.   You want the 433 MHz version with the small crystal (the S2 version).  It shouldn't cost more than around $6 US.  If you're in the US there are several sellers here, the last ones I picked up a few months ago were from a place in Texas I think.

Brian is right, they are hard to get off without lifting pads from the main board.  I had to superglue down a pad I lifted on a similar module. Fortunately it didn't break the trace, just lifted it off the board.

[zukenj]

hwh,
Thanks.

I contacted Banggood, and send them a video with the issue.

Will see what they will do.

What about this one:

http://www.ebay.com/itm/RFM22B-433Mhz-Wireless-Transceiver-from-HopeRF-/172052713043?hash=item280f240e53:g:~ooAAOxyRNJScbQk

[hwh]

Yes, that's the one.  And that's the company I picked up the last few I ordered from.

Banggood is funny about the videos, apparently customer service asks for them and someone technical reviews them and says ok it's bad.  Usually they'll ship a replacement and you get to keep the bad one.

[zukenj]

Banggood email me, asking if it was ok to send me a new one.

Hope the new one is right, otherwise I will have to go to the desolder route...

[f5soh]

The missing component is a 18nH inductor, 0402 format

[zukenj]

Laurent,

I am hopping that the new OPlink have the component in place.

 

[f5soh]

Just say that for the one you have already, instead of replace the module.

[zukenj]

Laurent,

Do you think that they replace the coil one for a Thin Film inductor?

[f5soh]

Except this one, the others inductors already mounted are Thin Film inductors.

If you can find a 18nH value, try to add the missing inductor.

[zukenj]

I am looking for a hot air soldering station, and I'll see if I can replace it.

[f5soh]

With a thin soldering iron you can do the job also

[zukenj]

You are GOOD. It is really small. Lol

Sent from my SM-N900P using Tapatalk

[zukenj]

I received my replacement OPLink from banggood, and it is working great. I checked the the coil was there and it is.


Sent from my iPad using Tapatalk

[darkdave]

I received my replacement OPLink from banggood, and it is working great. I checked the the coil was there and it is.

https://forum.librepilot.org/index.php?topic=1332.0

Glad you fixed your problem, can you send me the link to your supplier? Banggood? Please send me a link to their page and their Standard Revolution board sell page.

I want to talk to them and negotiate to resell their products on ebay:
https://forum.librepilot.org/index.php?topic=1652.0

May I assume that they have now fixed their problems with not just the oplink 433mhz stability issues but also their barometer?
https://forum.librepilot.org/index.php?topic=311.0

Also even if the 433mhz oplink issue is resolved, sometimes inevitably we will still have signal lost and reconnect. I have been doing some prop off testing on my QAV250 Chinese clone and discovered some disturbing issues: When I turn my transmitter back on and re-establish the link: The fail safe is interrupted and power offs for 2 seconds before the transmitter can take control of the drone again. That is 2 seconds of free fall time! This situation is made worst if you have to perform an arming action that consumes more time. What this means is that its better to let the drone complete its fail safe return to base and land sequence before reconnecting the controller to it. If your drone has no landing sequence then its a big problem.

Please send me the links to this supplier so I can contact them. I'm in China so I can negotiate.

Regards, David

[zukenj]

David,

I you negotiate please don't drag prices up. It is a expensive hobby already.

Site:
http://www.banggood.com/

Contact:
http://www.banggood.com/Contact-Us_hi111