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annotate pirelli/txcal @ 378:82fb5a70c9fd

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compal/audio: results of simple experiments
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Oct 2021 23:20:00 +0000
parents a7707c174510
children
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a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 In the same experiment in which I connected our CMU200 instrument to a decased
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 Pirelli motherboard (see rssi) I also observed the Tx power levels put out by
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 this phone in the PCS band by commanding the phone (by way of the CMU200 acting
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 in the role of a BTS in signaling mode) to transmit at each PCL from 0 to 15
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 and observing the actual power measured by the CMU200. Here are the findings:
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 the Pirelli puts out 29.2 dBm at the highest PCL 0 (spec number is 30 dBm),
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 whereas for all other PCLs the measured power was within 0.2 dB of the spec
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 number. Thus it appears that Pirelli's Tx calibration was done like TI's
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 LoCosto, with only the highest power level shifted down by 0.8 dB while all
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 others are spec numbers. This is a smaller fudging than that which was done by
a7707c174510 pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 Openmoko and which we currently replicate on our FCDEV3B modems.