[zukenj]

I get disconnection at 10m indoor,and less the 2m in the field. I had try different channels, different Power settings, my next test will be, to have a USB connected to the FC, and a USB connected to the Ground controller, two different laptops, and monitor the dB rates in both.

[kennyevo]

I get disconnection at 10m indoor,and less the 2m in the field. I had try different channels, different Power settings, my next test will be, to have a USB connected to the FC, and a USB connected to the Ground controller, two different laptops, and monitor the dB rates in both.

I'm curious about the result

[f5soh]

I'm curious about the result

That what i asked here: https://forum.librepilot.org/index.php?topic=1332.msg9734#msg9734
At least you can know the wrong device if the RF power is the issue.

From tests i did here i got around 100m where the link is completely lost, with minimal power (1.25mW)

[zukenj]

I will post a video with both laptops conected

Sent from my SM-N900P using Tapatalk

[finst]

Did a quick test today:
Instead of moving the revo around, I  took my oplink for a walk after I started logging the revo. The log shows a signal strength of around -70db with a distance of about 50 meters between revo and oplink. Both devices connected, running at ppm only and at 100% power. The antenna used with the oplink is a sh77 diamond (or whatever it's called), on the revo side I use the stock one. That said, the indicator shows about -20db with both devices literally next to each other.
But since this was just a quick test, the leads of the antenna just hang around and were not pointed in any certain direction or fixed in a right angled position. Is this normal or should I look into my setup?

Gesendet von meinem Nexus 6P mit Tapatalk

[zukenj]

I'm curious about the result

That what i asked here: https://forum.librepilot.org/index.php?topic=1332.msg9734#msg9734
At least you can know the wrong device if the RF power is the issue.

From tests i did here i got around 100m where the link is completely lost, with minimal power (1.25mW)

Your post gave me the idea, on using 2 laptops to monitor the dB. I don't have the result yet, because it took me 2 and 1/2 hours to compile next in the second laptop, so I end up at 1:30 AM, and went to bed.

[zukenj]

Here is the video with the OPLink issue.

[f5soh]

Looks like your Oplink Mini do not transmit as expected.
Be sure all antenna side is ok, open the case and inspect solder joins.

[zukenj]

Thanks f5soh (L).

I will do that, tonight and post back.

[zukenj]

I don't see ane solder problem. Please check if you see any suspicious one.

[f5soh]

There a missing coil.
Usually this component is used to power a RF stage, make sense if no range.

Edit: Look like this coil is used for the small "G4C" component, the Tx/Rx antenna switch.
http://datasheet.octopart.com/UPG2179TB-E4-A-NEC-datasheet-26379.pdf

[zukenj]

I see. 

Picture from AliExpress Coil.png


Picture from banggood.com Coil_2.png

[hwh]

Complain to the seller, maybe they'll replace it.

If not the entire RFM22b module runs about $6 US on eBay if you can solder.

[Brian]

It's not easy to desolder those modules.  You really have to heat both sides at once, which means a very large nozzle on a hot air gun, which means that many more parts might come undone as well.  Carefully working it with a solder sucker and/or wick might work, but I'm not sure it's worth it.

[zukenj]

Hwh,

Do you have a link just in case?


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