Yaesu FT-1000MP Operating Manual page 80

CAT System Computer Control
mask and scan skip feature. A bit value of "1"
means enabled, and "0" for disabled. Each value
of the hex code is entered into its respective field
in 4-bit binary format. The table below outlines the
Data Byte field, and show an example of how the
24.5-25.0 MHz band would be read as:
Operating Frequency
-
Likewise, the current op-
erating frequency is similarly coded, this time into
four bytes comprised of eight fields, from MSB to
LSB. Base conversion must be done on the value
19H = 24.5
-
25.0 MHz
(refer to band chart)
1
to arrive at the actual frequency (binary-to-hexa-
Operating Mode
-
The operating mode is ex-
pressed as a three-bit binary code in offsets 5-7.
Bit 0 contains a User Mode flag, while Bits 1-4
contain "dummy" values (unused).
its t -3 are "dummy bits"
-
a
/ O combination may appear
ere, but is insignificant.
Operating Frequency Data Bytes (1-4)
decimal, then hexadecimal-to-decimal. For exam-
ple, a read binary value of 0000 0001 0101 101 1
1 1 10 01 10 1000 0000 would convert to 14.250.00
MHz as follows:
IF Filter Selection
-
The first data bit (Bit 0)
contains a flag indicating normal or alternate re-
ception mode (see table). The remainder of the
data byte contains 2 x 4-bit fields separated by a
dummy bit. The first field holds the 3-bit binary
code for the 8.2 MHz 2nd IF filter selection, while
the second holds the 455 kHz 3rd IF selection.
Codes are listed in the bottom of the table below.
Clarifier Offset
-
Clarifier offset is written using
1 6-bit binary data in two bytes. Negative offsets
are expressed in binary 2s-complement format,
with a leading bit flag value* of "1
".
Although
frequency resolution below 10 Hz cannot be
viewed, absolute clarifier offsets down to 0.625 Hz
can be read from downloaded data.
Byte 1
Arithmetic conversion must be done on the binary
value to arrive at the actual frequency offset (mul-
VFO/MEM Indicators
-
Five flags indicate the
tiplying the 16-bit binary offset by 0.625). For
status of Clarifier (Rx & Tx), Repeater Offset (+I-),
example, a binary value of 001 1 11 10 01 10 11 1 1
and Antenna Selection (NBIRX). Bits 0 and 1 are
(3E6FH or 15,983) multiplied by 0.625 results in
not used (dummy values).
an offset of +9989.375 Hz.
01 5BE680H = 1,425,000 (base conversion)
1,425,000 Hz
=
14.250.00 MHz
F i ! & l
01010/0
0
A value of 1 100 0001 1001 0001 (the 2-s comple-
ment of the previous example) produces a minus
offset of -9989.375 Hz. See the byte chart at the
top of the next column for a breakdown of the
conversion process.
Field 2
0 1 0 0 1 1
1
page 78
Byte 2 Byte 4 Byte 3
Field 3
0 1 1 1 0 1
5
Field 7
1 / 0 1 0 / 0
8
Field 5
1 / 1 1 1 / 0
E
Field 4
1101111
B
Field
LSB
0 1 0 1 0 0
0
Field 6
0 1 / 1 1 0
6