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How to improve the communication distance with Gazell?

Dandingzz gravatar image

asked 2017-02-17 09:48:39 +0100

My gazell configuration is as follows:

#define PIPE_NUM                    0
#define TIMESLOT_PERIOD             2000
#define TIMESLOT_PER_CHANNEL        2
#define CHANNEL_TABLE_SIZE          1
#define CHANNEL_TABLE               {18}
#define SYNC_LIFETIME           (3 * CHANNEL_TABLE_SIZE * TIMESLOT_PER_CHANNEL)
#define MAX_TX_ATTEMPTS             3
#define TX_POWER            NRF_GZLL_TX_POWER_4_DBM
#define TX_DATARATE         NRF_GZLL_DATARATE_1MBIT

Payload size: 22bytes

frames per second: 100

When the communication distance up to 2 meters, the device often cannot receive the ACK from host, or the host cannot receive the packet form device. I don't know that is normal or not? Can I improve the communication distance by setting up a more reasonable configuration?

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2 meters are too short, it should be much more than that. You may want to send us or update here your schematic and layout of the boards, a close-up photo is also useful.

Hung Bui ( 2017-02-17 13:17:27 +0100 )editconvert to answer

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Dandingzz gravatar image

answered 2017-02-17 13:53:05 +0100

Here is my schematic, layout and close-up photo of the board: image description image description image description image description

In the board, I use the balun 2450BM14E0003 and the chip antenna 2450AT42A100E. The thickness of the PCB is 0.8mm. Can you please tell me what's the problem with this design? How much is the normal distance? Thank you~

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Your board looks OK. Could you try to test with the radio example or the ESB example in the SDK ? Just to check it's not the hardware issue.

Hung Bui ( 2017-02-17 14:27:17 +0100 )editconvert to answer

I have tried to test with the ESB example, and the same result were obtained.

Dandingzz ( 2017-02-18 03:07:49 +0100 )editconvert to answer

And here is my configuration in the ESB example:

#define PIPE_NUM                                    0
#define RETRANSMIT_DELAY                    600
#define CRC_LENGTH                              NRF_ESB_CRC_LENGTH_1_BYTE
#define CHANNEL                                     18
#define MAX_NUMBER_OF_RETX              10
#define TX_POWER                                NRF_ESB_OUTPUT_POWER_4_DBM
#define TX_DATARATE                             NRF_ESB_DATARATE_2_MBPS
Dandingzz ( 2017-02-18 03:12:44 +0100 )editconvert to answer

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Asked: 2017-02-17 09:48:39 +0100

Seen: 25 times

Last updated: 2 days ago