High PER at 2Mbps

[Michael]

Hi,

Scenario:

Two nRF52832DK boards on a table, approx 20 cm from each other, +4dBm output power.

Payload length is ~60bytes.

Running at 1Mbps gives me less than 0.1% PER, running at 2Mbps gives about 25% PER. (everything else kept identical)

Is this expected, or is there something at play here?

[Michael]

Nope, no WiFi or anything else... Spectrum is almost empty here... the same difference regardless of what channel I'm using....

And at that distance, if anything would affect the reception to a large extent it would probably be receiver saturation in that case.... But it that case, why such a difference between 1Mbps and 2Mbps...

[Michael]

In EN 300 328, that is relevant for me, there is no requirement on throughput... In what standard is throughput a requirement to test, I've not came across it so far? Receiver blocking is a requirement in several standards, but then you don't need to measure throughput...

I know that I'm sending a 1000 packets, since that's what my software do, and my Rohde&Schwarz spectrum analyser in zero span tell me so as well... It also tells me that I really don't have anything else going on here (unless I start anything to do so) in the ISM band. Obviously it does not tell me though if the nRF for some reason just likes to throw out garbage every 4th or so packet when configured for 2Mbps.

I'll try to see if there is any difference between the two 2 Mbps modes...