1-byte PhiDP Format (DB_PHIDP)

PhiDP is the two-way measured phase effect after the signal has travelled through the intervening weather twice. Differential phase (PhiDP) in degrees is computed from the unsigned output with:

$Φ D P mod ⁡ 180 = 180 × N - 1 254$

The overall range is from 0 ... 180° in steps of 0.71 as follows.

0	No data available
1	0.00 deg
2	0.71 deg
101	70.87 deg
254	179.29 deg
255	Reserved for area not scanned in product files