Is there a maximum separation in Mhz for ARFCNs on one BTS?

[Keith Whyte]

Hi all,

Would somebody who is familiar with the relevant part of the GSM spec be
able to comment?

I'm wondering if there's any issue in GSM running a dual TRX BTS with
two ARFCNs on opposite ends of the band?
For example, in GSM850, this would mean the downlinks could be on 869.2
and 893.8 Mhz so the phone could have to tune across a wider range
between the SDCCH and TCH for example.

Thanks!