RE: nRF51422 BLE/ANT+ RF testing with and without modulation

Håkon Alseth — Fri, 14 Mar 2014 11:49:55 GMT

Hi Chris,

I know we've already sorted this out through different channels, but I'm going to post the answers here as well, in case someone else wants to know.

BLE part is, as you mention, covered by the DTM firmware. The "ANT+ without modulation" is also covered by the DTM firmware due to:

An unmodulated carrier is independent of the data rate, so it will look the same no matter what data rate you set. The PLL is locked in this mode, so modulation is not possible. It's the same, but it's called different things depending where you see it, ANT CW mode, constant carrier, continuous carrier etc. But the modes are all equal. The only parameters that affects the unmodulated carrier are frequency and output power.

However, "ANT+ with modulation" is not a mode you can set in DTM. Since ANT uses the same modulation as the NRF_1MBIT, we recommend sending modulated packages continuously using the "radio_example" in the SDK, where NRF_RADIO->MODE = NRF_1MBIT.

Best regards Håkon