Change in gr-gsm[master]: apps/grgsm_trx: add baseband frequency shift feature

[Vadim Yanitskiy]

Hello Piotr Krysik, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/10770

to look at the new patch set (#2).

Change subject: apps/grgsm_trx: add baseband frequency shift feature
......................................................................

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
---
M apps/grgsm_trx
M python/trx/radio_if.py
2 files changed, 26 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/gr-gsm refs/changes/70/10770/2
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Gerrit-Project: gr-gsm
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I42e397e47402a87f4141ef31b25eff4c8c1267e2
Gerrit-Change-Number: 10770
Gerrit-PatchSet: 2
Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>
Gerrit-Reviewer: Piotr Krysik <ptrkrysik at gmail.com>
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