view txlevels/fcom1.README @ 108:85cf0f717ff6

txlevels/fcom1-900: no need for 750 basis pt, it's past the useful range
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Feb 2018 00:31:40 +0000
parents c5c1beae5f99
children
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The name "fcom1" stands for "FreeCalypso hardware, Openmoko-based, version 1",
and the set of Tx power level calibration profiles named "fcom1" has been
created empirically by the Mother of FreeCalypso to produce successful Tx level
calibration runs on our current FCDEV3B boards with our current CMU200 and
cabling setup.

These fcom1 Tx power level calibration profiles should ONLY be used for
(re)calibrating FreeCalypso-made hardware, i.e., FCDEV3B boards and potentially
other closely related FC hardware designs in the future; these profiles are NOT
expected to be correct for recalibrating Openmoko's own FreeRunners or for
calibrating other (non-FreeCalypso) Openmoko-derived GSM devices that retain
the internal antenna and the Murata SWD RF test port used by Openmoko, as
opposed to the SMA used on our FCDEV3B.

For anyone interested in one of those latter use cases, a different set of
profiles would need to be created; the Mother is not currently able to create
those profiles with a good confidence of correctness despite owning several
Openmoko-made FreeRunners and the appropriate Murata MXHS83QH3000 adapter
because the insertion loss of the latter adapter is not precisely known.
Knowing the total insertion loss along the full path from the DUT to the CMU200
is a prerequisite for determining the correct profiles for Tx power level
calibration, and when Murata SWD/SWF RF test ports are involved, this cabling
path includes both the cable from the CMU200 ending in an SMA and the adapter
from Murata that goes between the SMA and their switch connector.