[ICOM] Icom 706 Mark2G

[Renee]

I was just reading the info at the Icom website
about this radio. The info about the DSP states:

DSP features
DSP capabilities are available*. These include noise reduction and auto 
notch functions. Superior receive quality in your shack, vehicle or 
during DX'peditions.
*AF DSP; UT-106 DSP UNIT required for some versions.

Does anyone know what they mean by "some versions"? How
does one know if they are getting a "version" with the dsp
unit or not?
73,
Renee NZ9T