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CAT System Computer Control
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.
Clarifier Offset Data Bytes (5-6)
Byte 5
1* 1
0
0
0
0
0
1
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.
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).
Operating Mode Byte (7)
Bit 0*
Bit 1
Bit 2
Bit 3
User
N/A - "dummy bytes
Mode
0
X
X
X
0XXXX010 = CW operation, User Mode Off
Bits 1 ~ 3 are "dummy bits" -
0 = off
any 1/0 combination may ap-
1 = on
pear in here, but is insignificant.
page 92
16-B
D
YTE
ATA
Byte 6
1
0
0
1
0
0
0
1
Bit 4
Bit 5
Bit 6
Bit 7
Mode Data
(3-bit Code)
X
0
1
0
LSB
000
USB
001
CW
010
AM
011
FM
100
RTTY 101
PKT
110
R
S
ECORD
TRUCTURE
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.
IF Filter Selection Byte (8)
Bit 0*
Bit 1 Bit 2
8.2 MHz 2nd IF
Thru
RX
2.4k
Mode
2.0k
500
250
Mode*
CW
USB
0
1
LSB
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).
IF Filter Selection Byte (8)
Bit 0*
Bit 1
Bit 2 Bit 3 Bit 4
ANT
X
X
SELECT
Note:for all flag bits, 1 = On, 0 = Off
for ANT SELECT:
00 = ANT-A, 01 = ANT-B, 10 = RX ANT
MARK-V FT-1000MP Operating Manual
Bit 3
Bit 4 Bit 5 Bit 6 Bit 7
455 kHz 3rd IF
000
6.0k
001
X
2.4k
010
2.0k
011
500
100
250
AM
RTTY
ENV
LSB
SYNC
USB
Bit 5
Bit 6
RX
–RPT
+RPT
CLAR
000
001
010
011
100
PKT
LSB
FM
Bit 7
TX
CLAR

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