page 92 MARK-V FT-1000MP Operating Manual
A value of 1100 0001 1001 0001 (the 2-s comple-
ment of the previous example) produces a minus off-
set of -9989.375 Hz. See the byte chart below for a
breakdown of the conversion process.
16-BYTE DATA RECORD STRUCTURE
CAT System Computer Control
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).
IF Filter Selection - The first data bit (Bit 0) con-
tains a flag indicating normal or alternate reception
mode (see table). The remainder of the data byte con-
tains 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.
VFO/MEM Indicators - Five flags indicate the sta-
tus of Clarifier (Rx & Tx), Repeater Offset (+/-), and
Antenna Selection (A/B/RX). Bits 0 and 1 are not used
(dummy values).
Bit 0*
User
Mode
0
Operating Mode Byte (7)
N/A - “dummy bytes
Bit 1
X
Bit 2
X
Bit 3
X
Bit 4
X
Bit 5
0
Bit 6
1
Bit 7
0
Mode Data
(3-bit Code)
Bits 1 ~ 3 are “dummy bits” -
any 1/0 combination may ap-
pear in here, but is insignificant.
LSB 000
USB 001
CW 010
AM 011
FM 100
RTTY 101
PKT 110
0XXXX010 = CW operation, User Mode Off
0 = off
1 = on
Bit 0*
X
IF Filter Selection Byte (8)
Bit 1
X
Bit 2 Bit 3 Bit 4
–RPT
Bit 5
+RPT
Bit 6
RX
CLAR
Bit 7
TX
CLAR
Note: for all flag bits, 1 = On, 0 = Off
for ANT SELECT:
00 = ANT-A, 01 = ANT-B, 10 = RX ANT
ANT
SELECT
Byte 5
Clarifier Offset Data Bytes (5-6)
1* (flag) 100000110010001 = 4191H = 16,785
16,785 x 0.625 =
(–)
9989.375 Hz
*Note - Remember that the first bit is a flag: “0” for
positive offsets, “1” for negative offsets, and is not
included in calculations.
Byte 6
1* 1 0 0 0 0 1 1 0 0 1 0 0 00 1
Bit 0*
IF Filter Selection Byte (8)
Bit 1 Bit 2 Bit 4 Bit 5 Bit 6 Bit 7
455 kHz 3rd IF
6.0k 000
2.4k 001
2.0k 010
500 011
250 100
Mode* CW AM RTTY PKT
0 USB ENV LSB LSB
1 LSB SYNC USB FM
8.2 MHz 2nd IF
Thru 000
2.4k 001
2.0k 010
500 011
250 100
X
RX
Mode
Bit 3
