Vertex Standard FT-1000MP manual Rtty PKT

CAT System Computer Control

16-BYTE DATA RECORD STRUCTURE

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									Byte 6
1*		0		0	0	0	0	1	1	0	0		1	0	0	0	1
	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	Bit 4	Bit 5	Bit 6		Bit 7
User	N/A - “dummy bytes				Mode Data
Mode					(3-bit Code)
0	X	X	X	X	0	1		0
0XXXX010 = CW operation, User Mode Off
					LSB		000
					USB		001
0 = off	Bits 1 ~ 3 are “dummy bits” -				CW		010
	any 1/0 combination may ap-				AM		011
1 = on
	pear in here, but is insignificant.				FM		100
					RTTY		101
					PKT		110

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		Bit 3	Bit 4	Bit 5	Bit 6		Bit 7
	8.2 MHz 2nd IF					455 kHz 3rd IF
RX	Thru		000			6.0k		000
	2.4k		001		X	2.4k		001
Mode	2.0k		010			2.0k		010
	500		011			500		011
	250		100			250		100

Mode*	CW	AM	RTTY	PKT
0	USB	ENV	LSB	LSB
1	LSB	SYNC	USB	FM

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	Bit 5	Bit 6	Bit 7
X	X		ANT		–RPT	+RPT	RX	TX
			SELECT				CLAR	CLAR

Note: for all flag bits, 1 = On, 0 = Off for ANT SELECT:

00 = ANT-A, 01 = ANT-B, 10 = RX ANT

page 92 MARK-V FT-1000MP Operating Manual