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CC3235MODS: CC3235 coverage issue

Part Number: CC3235MODS
Other Parts Discussed in Thread: SYSCONFIG

Hi, 

Thanks to this forum, I end up development phase of CC3235MODS project.

When we implemented these modules in the target factory and did test running, We found that 

we need to improve coverage between devices. As this is an IoT application, I use 5GHz mode

in transceiver mode. The current parameters are as follows:

- Channel : 165

- RF power: 15

- Modulation: SL_WLAN_RATE_24M

- RF packet length: <60 bytes

- Antenna: dipole, 1 or 2dBi

- RF preamble: SL_WLAN_LONG_PREAMBLE

- What else?

Maximum distance between the devices are less than 30m. There is no wall between them, but various equipment made of steel.

What could you recommend to increase the communication success ratio?

Berards,

J.Y. Kim

  • Hi,

    Yes, range 30m is slightly lower than could be expected at such usage of transceiver mod. But environment with steel objects between device is pretty challenging especially for 5GHz. It may to be possible that you will not be able achieve better RF performance at 5GHz.

    What exact type of antenna do you use? Was your antenna RF path properly designed and validated (calculated and validated at VNA)? In case external antenna with SMA connector is used, have you checked performance of this antenna at VNA? My experience is that many multi-band  antennas at the market did not work properly. Here is nice video which demonstrate how crucial is proper RF design.

    Jan

  • Thanks for the comment. 

    I have another question. Under the imag.syscfg of CCS tool, there is a setting on Radio Setting>Antenna Selection, there are four choices: Disable, Antenna1, Antenna2, and Auto-select. I want to use 5GHz external antenna as I'm using CC3235MODSM2MOB. Which one should I select?

    Best Regards,

    J.Y. Kim

  • Hi,

    Module CC3235MODS does not have internal antenna.

    If your hardware does not have integrated RF switch for selecting from multiple antennas, you should select "Disable" for antanna selection at Sysconfig.

    Jan