Вот информация, не помню уже, из каких источников собирал:
The FT-847, as originally delivered, could not poll the radio for frequency and mode information. This was added beginning with the 8G05 production runs.
Serial Numbers
Yaesu appears to use the following format for serial numbers on their
amateur products:
Year of manufacture-Month of manufacture-Production Run-Individual Unit
number, where the month of manufacture is offset by 2, so "C" means January,
"D" means February, "E" means March, and so forth.
Example: 8G051234 = 1998, May (fifth month, or "G"), Production Run 05, unit
#1234 in this run.
One key serial number range is 8G05. This seems to be the point at which
Yaesu had corrected the bi-directional CAT issue and made some other
improvements. This version was made in May 1998. Later serial numbers (e.g.,
8L09nnnn) all seem to have incorporated the earlier improvements plus new
ones.
Starting with serial number 8G05xxxx (see the explanation of serial numbers here), two-way CAT control is standard.
