A Hytera DMR handset that I am working with has a frequency deviation of 2300-2700 Hz. This is higher than the expected 1944.0 Hz frequency deviation specified in the DMR specification (ETSI TS 102 361-1). Is it expected that low cost handsets have excessive frequency deviation? I'm wondering how the receiver performs synchronization when the frequency deviation can be so far out of range? 

[![enter image description here][1]][1]

More info:
- I/Q samples are collected with an SDR
- This question is *not* about carrier frequency offset but rather the FSK frequency deviation 
- To determine the deviation, I used an FM demodulator then measured the distance between minimum and maximum deviation.

**Update 1:**
- the frequency deviation is closer to 2100-2400 Hz after further measurement. 

  [1]: https://i.sstatic.net/AIA2I.png