tree 3123de049ef4d506fce566855454a5603fa3589a
parent 22cd7c973f4516542ec74f254b7c838643cc4f44
author Vadim Yanitskiy <axilirator@gmail.com> 1533853763 +0700
committer Piotr Krysik <ptrkrysik@gmail.com> 1536845744 +0200

apps/grgsm_trx: add baseband frequency shift feature

An ability to shift the baseband frequency would allow one to
run both base stations and (OsmocomBB-based) mobile stations on
any frequency (e.g. in 2.4 GHz WiFi band)!

This is achieved by adding a given frequency offset to the
result of "ARFCN -> RX/TX frequency" calculation.

Usage example:

  grgsm_trx --freq-offset -500M

Both RX (Downlink) and TX (Uplink) frequencies will be shifted
by 500 MHz back, e.g. tuning request to ARFCN 105 would result
in tuning the radio to 456.0 MHz (instead of 956.0 MHz).

Related: OS#3520 (https://osmocom.org/versions/136)
Change-Id: I42e397e47402a87f4141ef31b25eff4c8c1267e2