--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/txlevels/README	Tue Feb 13 02:25:27 2018 +0000
@@ -0,0 +1,13 @@
+Two sets of Tx power level calibration profiles have been created so far:
+rf3166-ideal and rf3166-fcdev3b.  As implied in the naming, both sets of
+profiles are meant for GSM MS designs using the RF3166 PA as used by Openmoko,
+following OM's triband board design for the RF section.  The only difference
+between the two versions is in the target dBm number for the maximum power
+level for the low band (EGSM or GSM850): it is 33 dBm as the GSM 05.05 spec
+calls for in the rf3166-ideal-900 profile, but the rf3166-fcdev3b-900 profile
+has it shifted down to 32.2 dBm, similarly to how TI did it on their I-Sample
+(LoCosto) boards.  The rf3166-ideal profile set works for recalibrating
+Openmoko-made GTA02 devices, producing even better Tx power levels than OM's
+original (set to unshifted GSM 05.05 spec targets), but on our own FCDEV3B
+boards we are not able to get the full 33 dBm Tx output in the low band, hence
+the rf3166-fcdev3b profile set with the shifted target.