HC-12 error correction

[iw2fvo]

Both HC_12's have their own antenna.
Data are received but some errors are present.
Thanks

[Scampy]

Are you saying that up to around 50m data is sent and received OK and then above 50m data is being lost or corrupted.. if so it could be 101 things such as a range issue with the modules (ie they are designed to only work up to 50m), interferance, or the modules are faulty.

[iw2fvo]

Thanks,
the modules are brand new and they have a standard 433 MHz rubber/ plastic antenna.
They are sold for about 1000 meters: I just need about 100 meters...
Is there any program that could recover the comm errors ?
Thanks

[gadelhas]

Hi;

I use those modules a lot.
The 1000m are of course in best of the best conditions, but 50m are very bad.

Look at the datasheet, to increse the range you need to decrease the baud rate, increase the transmitting power, changing the FU mode, even changing the frequencie can help!
( Datsheet - http://www.seeedstudio.com/wiki/imag...ser_Manual.pdf )

[iw2fvo]

Thanks Gadelhas,
What port rate are you using ? I am using 9600 8 n 1.
I also use the default setting for the hc-12 : max power and FU_3 @ 4.2 vdc.
Do you use any correction algorithm ? LOOP_back or similar ?
I just dend data over the UART ..
Thanks a lot
Ambro

[gadelhas]

Thanks Gadelhas,
What port rate are you using ? I am using 9600 8 n 1.
I also use the default setting for the hc-12 : max power and FU_3 @ 4.2 vdc.
Do you use any correction algorithm ? LOOP_back or similar ?
I just dend data over the UART ..
Thanks a lot
Ambro

Hi;

In this moment i'm using 4800,8,n,1, max tx power.
No, i'm not using any correction, and i'm tx/rx about 83 bytes for message 1 time for second. ( NMEA RMC Message ). The distance is about 80m (+- 2m ) with 3 walls in the middle!

[iw2fvo]

yours are good result.
I will try @ 4800 8 n 1 .
Thanks
Ambrogio