Gazell Datarate Seems Very Low

[Charles Horkin]

Hello,

I've modified some of the gazelle sample code and I've been testing the throughput. I am basically using all the default settings and I'm seeing throughput of 43Kbps. I test this by setting a GPIO just before I add a packet to the TX fifo, then clear the same GPIO once I get the TX Success callback. The gpio pulse is approximately 5.94ms. 32 bytes / .00594 * 8 bits_per_byte = 43Kbps. This is with the device and host set to 2MBps data rate. I've tried increasing the tx power, adjusting out of sync counts and more but nothing is really increasing my data rate. Am I missing something here or is the advertised data rate meaningless in regards to actual data throughput?

Thanks.

[Charles Horkin]

After much experimenting, I found that if I reduce the channel table to 2 (cut in half), my data rate doubles. When I go to a single channel, I see 200Kbps. Still not up to the advertised 2Mbps

[ovrebekk]

Just a brief comment Charles, 2 Mbps is the on-air data rate. Regardless of what protocol you use the practical data rate will always be lower, because of overhead in the packet (preamble, address, length field and CRC), radio startup times and so forth.