Locating Preamble and Decoding data

Today I figured out why half of my data is being decoded correctly and the other half is not.

Turns out that the D30 bit of the previous word causes bits 1-24 of the next word to be inverted.

These bits need to be reinverted before they can be used.

Steps to locate and confirm the preamble are as follows.

1. Locate preamble 1000101100.
2. Locate the preamble again 10 words away.
3. Check the 2nd word(HOW) and verify that it has a valid subframe ID, and how time.
4. Check the next (HOW) word and verify that it has a valid subframe ID, HOW time, and that they increment or roll over accordingly.
5. Perform parity checks.
6. Check the d29 and d30 of the HOW word and ensure they are equal to zero.