Hal Communications DXP38 User manual

-DXP8.€-
HF RADIO DSP MODEM
OPERATOR'S
MANUAL
HAL COMMUNIGATIONS
P.O. BOX 365
URBANA, lL 6{g03-0365
QUALITY COM M U N I CAIIOA/S EQU IP M ENT
t-

HF RADIO DSP MODEM
OPERATOR'S
MANUAL
Copyright 1998 O by HAL Communications Corp., Urbana, lllinois. Printed in the United States of America. Contents of
this publication may not be reproduced in any form without the written permission of the copyright owner.
870-13800
October 14, 1999 Printing
HAL991A14 DXP38 MANUAL

Chapter 1. Introduction
Chapter 2
2.1
22
23
2.4
2.5
Chapter 3Operation Under Windows
31
32
3.3
3.4
35
36
Table Of Contents
Unpacking and Inspection ...2-1
DXP3B Rear Panel Connections.. ...2-2
2.2.1 Audio Input .2-2
2.2.2 Audio Output ....2-4
2.2.3 PTT Output... ....2-4
2.2.4 FSK Output .... ..2-5
2.2.5 SEL-CAL Output ....2-6
2.2.6 RS-232 Connections . ...2-6
2.2.7 Ground Connection. .....2-7
2.2.8 DC Power Connection ... ....2-7
f nitial Transmitter and Receiver Adjustment .. ...2-7
Front Panel Status and Tuning Indicators ".2-9
2.4.1 Status Indicators ....2-9
2.4.2 Tuning Indicator - M/S Mode ....2-9
2.4.3 Tuning Indicator - Af Mode... ....2-9
2.4.4 Print Squelch Indicator .....2-11
Special Considerations When Operating CLOVER. ...2-11
2.5.1 Transmitter and Receiver Requirements. 2-11
2.5.2 Receiver Tuning of CLOVER-Il Signals ...2-12
2.5.3 Transmit Modulation ..2-12
2.5.4 Receiver AGC and Noise Limiter .2-12
2.5.5 Receiver Filters ....2-12
2.5.6 Receiver Audio Level .. .....2-13
2.5.7 Adaptive Control and Radios. 2-13
1.1 The DXP38 Manual .1-1
1.2 DXP38 Software.. ....1-1
1.2.1 Minimum Requirements. ....1-2
1.2.2 Software and Documentation Up-Date.. ....1-2
Installation and Set-Up
Installing DXPWin Software ......3-1
3.1 .1 The DXPWin Setup Window ....3-2
3.1 .2 Changing DXPWin Directory ....3-2
3.1.3 Beginning Installation ...3-2
Manual Conventions ..... 3-3
Running DXPWin .. ..3-5
MYCALL Setup . 3-5
Main Screen. .....3-5
Menu Line ... 3-6
3.6.1 File Menu ... 3-6
3.6.2 Edit Menu... 3-7
3.6.3 Code Menu.... ...3-7
3.6.4 Configure Menu.... ..3-7
3.6.5 Special Menu ... 3-8
HAL99 1014 DXP38 MANUAL

Chapter 4
3.7 Toolbar .........3-8
3.8 Receive (RX) Buffer. ........3-9
3.9 Echo on Transmit (TX) Buffer ............3-9
3.10 Transmit Buffer.......... .......3-9
3.11 Tuning Indicators.... ........3-10
3.12 Status Bar ............. .........3-10
3.13 GeneralConfiguration................. ......3-10
3.14 Operating RTW......... ....3-11
3.14.1 RTTY Codes ................. ......3-11
3.14.2 Starting RTTY......... .............3-11
3.14.3 RTTY Data Rates.......... .......3-12
3.14.4 ControlOptions ....................3-12
3.14.5 Configuration Options .........3-13
3.14.6 Special RTTY Transmit Keys..... .............3-14
3.15 Operating CLOVER-|| ....3-14
3.15.1 Tuning a CLOVER Signal ....3-14
3.15.2 RX/TX Status Tab|e......... ....3-15
3.15.3 Adaptive ARQ Mode ...........3-15
3.15.4 FEC Mode.. ......3-16
3.15.5 Listen Mode ......3-17
3.15.6 Test Mode .........3-17
3.15.7 CLOVER-Il Configuration Menu Parameters .............3-17
3.16 Operating AMTOR ........3-18
3.16.1 ControlOptions ....................3-18
3.16.2 ARQ Mode ........3-18
3.16.3 FEC Mode .........3-20
3.16.4 Listen mode.......... ................3-20
3.17 Operating P-Mode....... ...3-20
3.17.1 Control Options ....................3-20
3.17.2 ARQ Mode ........3-21
3.17.3 FEC Mode (UNPROTO) ................ ........3-22
3.17.4 LISTEN Mode.......... ............3-22
Operation Under DOS
4.1
4.2
4.3
4.4
f nstalling DXP3B Software .. 4-1
Manual Conventions .....4-2
MYCALL Setup . 4-3
Main Screen . .....4-3
4.3.1 Tuning Indicators ...4-4
4.3.2 Receive (RX) Buffer .....4-4
4.3.3 Status Line .4-4
4.3.4 Command Line .4-4
4.3.5 Transmit (TX) Buffer ....4-4
4.3.6 Information Line .....4-4
Configuration Screens 4-11
Hot-Keys. ..4-13
4.6.1 Function Hot-Keys .....4-13
4.6.2 Alt-letter Hot-Keys 4-13
File Operations 4-16
4.7.1 Load TX Buffer .....4-16
4.7 .2 Save To Disk.... ....4-16
4.7.3 Stop Send / Save .4-17
4.7.4 Send From Disk ...4-18
4.7.5 Directory ...4-18
4.7.6 Load DXP38 ...4-18
4.5
46
4.7
HA1991014 DXP38 MANUAL

4.8 TX Buffer Editor.......... ....4-18
4.9 Operating RTTY......... ....4-19
4.9.1 RTTY Codes................ ........4-19
4.9.2 Starting RTTY ...4-19
4.9.3 RTTY Data Rates.......... .......4-20
4.9.4 Control Menu Options............... .............4-20
4.9.5 Configuration Menu Options ...................4-22
4.9.6 Print Sque1ch................. .......4-23
4.9.7 Special RTTY Transmit Keys..... .............4-23
4.10 Operating CLOVER-|| ....4-23
4.10.1 Tuning A CLOVER Signa|......... ..............4-24
4.10.2 RXTX Status Tab|e......... ...4-25
4.10.3 Adaptive ARQ Mode ............4-26
4.10.4 FEC Mode .........4-27
4.10.5 LISTEN Mode.......... .............4-28
4.10.6 Test Mode .........4-28
4.10.7 CLOVER-Il Configuration Menu Parameters. ............4-29
4.11 Operating AMTOR .........4-29
4.11.1 ARQ Mode ........4-29
4.11.2 FEC Mode ........4-33
4.11.3 LISTEN Mode.......... ............4-33
4.12 Operating P-Mode...... ...4-33
4.11.1 ARQ Mode ........4-33
4.11.2 FEC Mode (UNPROTO). ... .......... ........4-35
4.12.3 LISTEN Mode.......... .............4-36
In Case Of Difficulty
Chapter 5
Chapter 6
51
5.2
53
5.4
5.5
56
5.7
Specifications
Warranty
User Adjustments and Alignment... . 5-1
DXP Hardware Problems. ... 5-1
Software Problems ..5-2
Operational Problems ...5-2
User Service... ... 5-3
User Information 5-3
Returning Equipment to Factory for Repair 5-4
HA1991014 DXP38 MANUAL

Table 2.1
Table 2.2
Table 2.3
Table 2.4
Table 2.5
Table 2.6
Table 2.7
Table 3.1
Table 3.2
Table 3.3
Table 3.4
Table 4.1
Table 4.2
Table 4.3
Table 4.4
Table 4.5
Table 4.6
Table 4.7
Table 5.1
Figu re 2.1
Figu re 2.2
Figu re 2.3
Figu re 2.4
Figu re 2.5
Figu re 4.1
Figu re 4.2
Figu re 4.3
Figure 4.4
Figu re 4.5
Figure 4.6
Figu re 4.7
Figure 4.8
Figure 4.9
Figu re 4. 1 0
Tables
DXP38 l/O Connections .....2-2
AF OUT Voltage Ranges ... 2-4
DXP38 FSK Output Options . ...2-5
FSK for Typical Amateur Transceivers 2-5
RS-232 Data l/O Connections .2-T
DXP38 Status Indicators ....2-9
CLOVER-|| HF Radio Requirements. 2-11
RTTY Data Rates and Speeds ... .3-1 1
RTTY and AMTOR Default Settings ..3-12
Baudot Code Differences . 3-13
Special RTTY Transmit Keys .3-14
Function HOT-KEY Assignments. 4-14
Alt-letter HOT-KEY Assignments. 4-15
Transmit Buffer Edit Keys 4-19
RTTY Data Rates and Speeds ... .4-20
RTTY Control Options.. ....4-20
Baudot Code Differences .4-22
Special RTTY Transmit Keys .4-23
User-Set Options .... 5-1
Figures
DXP38 Rear Panel Connectors... ..2-2
Radio System Connections.. ....2-3
Jumper J3 and J6.. .24
Typical M/S Mode Tuning Display .....2-10
Typical Af Mode Tuning Display ...2-10
DXP38.EXE Main Screen . .4-3
Main Menu Tree for CLOVER (left side) ....4-5
Main Menu Tree for ALL Codes (right side) .4-6
Main Menu Tree for Baudot RTTY (left side) ...4-7
Main Menu Tree for ASCII RTTY (left side) .....4-8
Main Menu Tree for AMTOR (left side) 4-9
Main Menu Tree for P-Mode (left side) ....4-10
Configuration Menu - Page 1 (CLOVER & System)..4-12
Configuration Menu - Page2 (HERE lS & HISCALL)4-1?
Configuration Menu - Page 3 (FSK Modes) ...4-13
H41991014 DXP38 MANUAL

FCC Statement
FCC RADIO FREQUENCY EMISSIONS STATEMENT
(Reference: CFR 47, Part 15)
U.S. Federal Communications Commission (FCC) Rules and Regulations, CFR47, Part 15,
require inclusion of the following text in this manual.
INFORMATION TO THE USER (Section 15.105)
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that the interference will not occur in a particular installation. lf this equipment does
cause harmful interference to radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
-Reorient or relocate the receiving antenna
--lncrease the separation between the equipment and the receiver.
--Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
--Consult the dealer or experienced Radio/TV technician for help.
INFORMATION TO USER (Section 15.211
The user is cautioned that any changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate the equipment.
P-Mode
The word "P-Mode' is the HAL designation for a communications protocol that may also be known as "Pac{or", a
registered trademark of the Spezielle Communications Systeme GmbH (SCS) firm in Hanau, Germany. HAL afiirms that,
to the best of its knowledge,'P-Mode' is compatible and interoperable with the protocol SCS calls "Pac{or'' ard with the
link establishment mode of the protocol SCS calls " Pactor-ll'.
HA1991014 DXP38 MANUAL

Chapter 1
Introduction
1.1 The DXP38 Manual
The DXP38 is the latest in the evolution of HAL DSP modem products that started with the PC14000.
Operation, software, and control are very similar to that of the PC14000, P38, and DSP-4100 modems.
Many of the same terminal programs used with these modems may also be used with the DXP3B with little
or no changes. lf you are already familiar with use of HAL DSP modems, please have a look at the
instructions and diagrams of Chapter 2 and then jump right in.
Unlike previous HAL DSP modems, the DXP38 includes a hardware front panel tuning indicator that works
with all terminal programs. The crossed-bar display is used for all data modes - RTry, AMTOR, P-Mode,
and CLOVER. The display may be switched between the normal M/S'+'tuning display and a zero-center
tuning error scale. Use of the display for each mode is discussed in Chapter 2.
The DXP38 also includes DXPWin, a new HAL terminal program that runs under W95, W98, or NT4.0
WindowsrM operating systems. The display format of DXP\Mn is very similar to the format of our DOS-
based P38.EXE, PCC.EXE, and DSP41.EXE programs. You may not need much instruction to use this
software, particularly if you are familiar with windows programs and if you have previously used the HAL
DOS programs. However, a thorough reading of Chapter 3 is in order after "the new wears offl'.
Our DOS-based terminal program, DXP38.EXE, is also included for all that wish to continue using PC-
DOS. This is the popular and proven program HAL has included with all of our DSP modem products
since 1993. Chapter 4 includes all of the operating details for those who may not have used this software
or those of us who have forgotten a detail or two.
lf you have problems, read Chapter 5, In Case of Difficulty. Sometimes, fixing a problem can be as simple
as adding shielded wire; sometimes you need to send the modem to us for "heart surgery" or maybe it's
time for an "oil change and a lube job"l
Chapter 6 lists all of the fine-print specifications for those who like impressive numbers.
Be sure to read the Warranty. lt is the standard HAL Warranty we have used for years. HAL stands behind
its products. lf you have a problem - LET US KNOW!
1.2 DXP38 Software
Your DXP38 package includes four (4) 3.5" diskettes. Three of these diskettes contain DXPWin, the
windows-based terminal program. The remaining diskette contains DXP38.EXE, the DOS-based terminal
program, and firmware that is used by the on-board microprocessors. Loading of DXPWin is discussed in
Chapter 3 and loading of DXP38.EXE in Chapter 4. The firmware files on disk 4 will not be required unless
the contents of the flash memory become damaged. Consult Chapter 5 to determine when reloading is
necessary and how to reload the firmware.
HAL99O30B DXP38 Manual

CHAPTER 1 INTRODUCTION 1-2
1.2.1 Minimum Requirements
The DXP38 modem and its DXPWin or DXP38.EXE Software may be used with virtually any RS-232-
equiped, IBM-compatible personalcomputer (PC). The serial port requirements are:
Connector (DXP38): DE9P (male pins)
Data Format: Rs-z32levels with RTS/CTS hardware flow control
Data Rate: 9600 baud
Data Format: No Parity, 8 bit data, 1 Stop bit (N-8-1)
The requirement on the PC itself is dependent upon whether the DOS or windows version of terminal
software is used. Relatively old, slow, and inexpensive PC's may be used with DOS software; use of
Windows requires a modern, fast, and relatively expensive PC. The minimum recommendations are:
DXPWIn (use with Windows-95rM, Windows-98rM, or Windows-NT4.0rM):
PC-Pentium, 100 MHz
32 MB RAM
1 - 3.5'floppy disk drive
1 - hard disk drive (20MB free space minimum)
VGA video card and monitor minimum
DXP38.EXE (use with PC-DOS):
PC-AT or higher with MS-DOS or PC-DOS
IBM-compatible ROM BIOS
640K RAM minimum
1 - 3.5" floppy disk drive
1 - hard disk drive (1MB free space minimum)
Third-Party Programs: lf you will be using "Third-Party" terminal programs with the DXP38 (software not
written by HAL), carefully read the documentation provided with the program and follow its instructions.
Note that the DXP38 uses the same command set as the DSP-4100 modem. lf 'DXP38' is not listed as a
modem option, try using "DSP4100' instructions. HAL Communications Corp. continues to work closely
with a number of software authors and firms to provide additional user software. See our web page for
links and a current list of "3rd Party" authors for CLOVER and DXP38 software.
1.2.2 Software and Documentation Up-Date
New versions of each program are available to all DXP38 owners as they are released by HAL
Communications. Some software changes may also require changes to the documentation (manuals).
Current copies of DXP38 software and documentation updates may be downloaded from our lnternet web
page at www.halcomm.com.
lf you have problems or need additional information, please call:
Customer Service Manager
Voice: [phone] (8AM - sPM CST/CDT; Monday - Friday)
FAX: (217\ 367-1701 (24 hours/day)
HALg9O30B DXP3B MANUAL

Chapter 2
Installation and Set-up
This chapter discusses how to connect the DXP38 modem to the radio system and to a PC terminal.
Operation of the front panel tuning and status indications is discussed in section 2.4. Installation and use
of HAL terminal software is presented in Chapter 3 (DXPWin for use with W95, W98, or NT4.0) or
Chapter 4 (DXP38.EXE for operation under MS-DOS).
2.1 Unpacking and Inspection
The DXP3B system includes the following materials:
1 - 900-13800 Complete DXP3B product
This includes:
- 910-13800 DXP38 HF Modem
.870-13800 DXP38 MANUAL
- 865-13810 DXP38-Disk #1 (DXPWin #1, Rev X)
- 865-13820 DXP38-Disk #2 (DXPWin #2, Rev X)
- 865-13830 DXP38-Disk #3 (DXPWin #3, Rev X)
- 865-13840 DXP38-Disk #4 (DXP38.EXE, DXP38.LOD & DXP38.S28, Rev x)
- 310-16032 DC PowerConnector
When opening the DXP38 shipping carton, carefully inspect it for any evidence of shipping damage. Any
damage should be immediately reported to your shipping carrier. Be sure to save any damaged packing
materials. Note that a damage claim must be filed by you with the shipping carrier - NOT HAL
Communications. HAL will be glad to assist in such cases, but only the shipping carrier can pay claims.
Check to be sure that all of the materials listed above are contained in your DXP38 package. lf you find
any materials missing, please contact your dealer or HAL Communications as soon as possible.
HA1990308 DXP38 MANUAL

CHAPTER 2INSTALLATION 2-2
2.2 DXP38 Rear Panel Gonnections
The rear panel of the DXP38 modem is shown in Figure 2.1 and the limits for each l/O signal are shown
in Table 2.1. These requirements are compatible with all modern amateur transmitters and receivers. DO
NOT EXCEED THESE LIMITATIONS.
GND
@
DC
IN
@
HAL Communico.tions Conp,
DXP38 DSP Modem
Ser^io.I No,
Mode In USA
SrLCAL FSK PTT tr' TX ?[ RS _?3?
@ @ @ @6@oEo
Fig ure 2.1 DXP38 Rear Panel Gonnections
Table 2.1
DXP38 l/O Gonnections
CONN
AF IN
AF OUT
PTT
FSK
SELCAL
DC IN
GND
RS-232
I nput
Output
Output
Output
Output
I nput
Ground
r/o
FUNCTION
ffi
Audio to TX
Push-to-Talk Output
FSK Output
SEL-CAL Output
DC Power Input
RF Ground
Data
LIMITS
5V p-p
-30dBm (25 mV)
+50V @ 100 ma
+50V @ 100 ma
+50V @ 100 ma
+9 - +18V @ 0.6A
+l-15 VDC
t/o
Typical connections of the DXP38 to radio station equipment are shown in Figure 2.2.
2.2.1 Audio Input
The DXP38 Audio Input (AF lN) is unbalanced. The Input impedance is 10,000 ohms, +1Oo/o. This input
can be directly connected to a wide variety of receiver audio output terminals including low-impedance
speaker (4 - 16 ohms), line (600 ohms), headphone (2K ohms) or "recorder output" (10,000 ohms). A
matched terminating resistor is not required. The maximum audio input voltage to the DXP38 should not
exceed 5 volts peakto-peak (1.7V rms; +7 dBm). The DXPWin and DXP38.EXE terminal programs
include tuning indicator bars which may be used to adjust the receiver output volume.
HA1981211 DXP38 MANUAL

CHAPTER 2INSTALLATION
RS-e3a Coblnet
Sentol I/tr Cose
C0MM Pont (Gnound)
IPC
2-3
SCAN
CINTROLLER
([PTIINAL)
AF
IN ?
I
A
-'l
@l
r
I
I
L
-Cl @
-J
DC
+ P0VER
SUPPLY
9-18V
0,6A
ANTINNA o
HF TRANSCfIVTR
RX TX STOP
. AF AF SCAN
NUT IN PTT FSK (t]PT) G N D
@oo@@
HAL Connunlcotlons Corp.
DXP38 DSP Moden
Senlot No.
-
llod. h IJSA
AF AF
CAL FSK PTT OUT.IX IN RS-232
@ @ @ @'6@oEo
HALgB 1211
Figure 2.2 Radio System Gonnections
DXP3B MANUAL

CHAPTER 2INSTALLATION 2-4
2.2.2 Audio Output
The DXp38 Audio Output (AF OUT) is also unbalanced. The nominal output impedance is 600 ohms but
AF OUT does not require a termination load. lt may be connected to a wide variety of transmitter audio
input terminals including microphone (low or high-impedance), "phone patch", or "line (600 ohm). The AF
OUT circuit includes a 1uF series capacitor to prevent DC loading of transmitter microphone inputs that
have a DC bias voltage.
Jumper J3 on the circuit board (see Figure 2.3) sets two output voltage ranges. The exact level may be
set via the rear panel TX LVL adjustment. The output ranges are shown inf able2.2.
AF IN
LVL
OUT
TX
AF
Figure 2.3 Jumper J3 and JG
Table 2.2
AF OUT Voltage Ranges
All DXP38 units are shipped with jumper J3 in the -30 dBm position and the rear panel output control set
for -30 dBm. This output voltage will be correct for use with microphone (or "phone patch") inputs of most
HF SSB transmitters. J3 should be changed to the "Closed" position when the DXP38 is connected to
transmitters that require a high-level transmit audio input. Proper adjustment of the TX LVL control is
discussed in section 2.3.
|MPORTANT CONSTDERATION WHEN USING CLOVER: The DXP38 has an "FSK Output'that may be
used for AMTOR, P-Mode and RTTY. However, the CLOVER-|I waveform cannot be generated when
transmitters are operated in an "FSK" mode. The transmitter should be operated in LSB mode and the
CLOVER-Il transmit audio tone signal must be connected to the transmitter audio input.
2.2.3 PTT Output
The DXP38 provides TXRX control of the radio equipment via the PTT (Push-To-Talk) transistor output
on the rear panel. This is shorted to ground to transmit and is open circuit when receiving. The DURX
PTT circuit should have a positive polarity with a maximum open-circuit voltage (RX state) of 50 volts DC
and a maximum closed circuit current (TX state) of 100 ma DC.
r-1 [
t-1
t-] [
:I
r-1 [
t-l I
l-1
r-u
tr l-10
tl
tl
E====:
Fo
:|'|
t-l-
'-tt
l-J U =:: E
l-1 - ^i-IEr
ll
-[|
l-l.q-6'1-
r-l - l-11-l I hc-] 0l_
I I o_ -r-J, E ^B
rn Eol [r-ll u0l_
'-'HmFl | &DoE
r-tug0 t-1 gt-?l-Ol
u
:
l-1 l-I ll-t-?- b
I a tt g
r-1[ 6o:[,_.' n
Entr4imr-rl H
gFl-
-50 to -?0 dBm
(Ilefoutt Settng)
Ator-
-30 T0 -10 d
trI
n, c,
(Defoutt Setttng)
re
+5V
Nominal Output Voltage Adjustment Range
Open
Closed -30 dBm (25 mV rms)
-10 dBm (250 mV rms) -50 to -20 dBm (2.5 to 78 mV rms)
-30 to -10 dBm (25 to 250 mv rms)
HALgB 1211 DXP38 MANUAL

CHAPTER 2INSTALLATION 2-5
2.2.4FSK Output
FSK OPTION SELECTION: The DXP38 FSK output circuit may be used with many modern HF
transceivers that include an FSK input to transmit RTTY, AMTOR, or P-Mode. However, as previously
noted, CLOVER cannot be transmitted using the transceiver FSK input. A "universal" FSK interface
standard for HF transmitters does not exist between manufacturers or between models made by the
same manufacturer. Four FSK interface options may be selected that support those FSK standards we
have encountered. lf you have additional information regarding FSK inputs, we would appreciate your
comments.
The FSK output is an NPN transistor which can be set for open collector (O C ) or pulled up to + 5 Volts
D.C. 1+5y; by setting jumper plug J6 (see Figure 2.3). The factory default setting is to O.C. (Open
Collector). The polarity of the FSK output is selected from the operating program (DXPWin or
DXP38.EXE). See Chapters 3 and 4 to access this parameter on the Configuration menu. The factory
default setting is to Normal polarity.
Some transceivers require a switch to ground on the FSK input. In this case, use the O.C. (Open
Collector) setting for J6. Other transceivers require a voltage on the FSK line. In this case, use the +5V
setting for J6. Table 2.3 summarizes the four possible combinations of DXP38 FSK output signal. Table
2.4 lists the correct FSK combinations for a few transceivers.
Table 2.3
DXP38 FSK Output Options
POLARITY J6
o.c
OC
+5V
+5V
MARK
OV
Floating
OV
+5V
SPACE
Fbailng
OV
+5V
OV
NORM
REV
NORM
REV
Table 2.4
FSK for Typical Amateur Transceivers
MFGR
TENI-I'EC
TEN-TEC
TEN-TEC
KENWOOD
KENWOOD
KENWOOD
KENWOOD
ICOM
ICOM
ICOM
ICOM
ICOM
ICOM
YAESU
YAESU
YAESU
YAESU
YAESU
MODEL
CORSAIR
PARAGON (585)
oMNr (582)
TS.1BO
TS-440
TS-930s
TS-940s
tc-730
tc-740
lc-745
,c-751
tc-761
rc-781
FT-101ZD
FT- 107
FT-g10t902
FT-gBO
FT.ONE
POLARITY
NORM
NORM
NORM
NORM
NORM
REV
NORM
REV
REV
REV
REV
REV
REV
NORM
NORM
NORM
NORM
NORM
J6
.5V
+5V
+5V
OC
+5V
OC
o.c
oc
oc
OC
oc
OC
OC
OC
OC
o.c
OC
OC
H41981211 DXP38 MANUAL

CHAPTER 2INSTALLATION 2-6
This data is based on reports from HAL customers and some manufacturers. HAL would like to know of
any other information you may have concerning FSK inputs. A careful reading of your transceiver manual
or a call to the manufacturer's "Customer Assistance Departmenf' may be required to determine which
interface level is required for your equipment. lf your transceiver is not listed or you have some doubts
about the required level or polarity, try the following:
1.
2.
3
4.
Start with NORM polarity and set to J6 O.C. (factory default settings).
Try sending simple FSK RTTY to a friend with a working RTTY station.
lf you cannot send Mark/Space RTTY, the J6 setting may be wrong. Try setting J6 to +5 V.
lf you can send FSK, but it is upside down, change the polarity to REV.
Note: This information is offered as a service to our amateur customers only. HAL cannot guarantee
performance for FSK mode nor be held responsible for any damage that may result from connection of
voltages to a transceiver "FSK" input jack. lf you have any doubts, please contact the transceiver
manufacturer before making any connections.
2.2.5 SEL-CAL Output
The SEL-CAL output of the DXP38 is an open-collector NPN transistor (MPS-A42) that switches to
ground during an ARQ link. This signal may be used to signal that the station has been called and linked
in ARQ mode or to control frequency scanning radio systems. The rating of the switching transistor is +50
VDC maximum (open circuit) and 100 ma DC maximum (closed circuit).
The SEL-CAL output is normally open ("high") until the call sign of the local station (MYCALL) is
recognized during an ARQ link request. When MYCALL is recognized, the SEL-CAL output shorts to
ground ("low"). Options in DXPWin and DXP38.EXE allow selection of two modes to match switching
requirements of various radio models. The modes are "CONTinuous" and "PULSE".
In the CONTinuous SEL-CAL mode, the SEL-CAL output signal remains in the "low" state throughout the
ARQ link. The signalwill revert to "high" when the ARQ link is terminated at disconnect.
In the PULSE SEL-CAL mode, the SEL-CAL output signalwill pulse "loW'for 2 seconds when MYCALL is
recognized, remains "high" during the ARQ link, and will again pulse "low" for 2 seconds when the ARQ
link is broken (disconnected).
The interface wiring to the SEL-CAL output varies widely with radio manufacturer and model. Detailed
connection information should be obtained from either the radio manufacturer or from other radio
operators who have made successful scan-control interfaces to their radios. At this writing, none of the
commercially available amateur radio transceivers provide a rear-panel scan-control input connection - all
makes and models require modification.
While HAL warrants the operation of the SEL-CAL output signal to be as described above, this warranty
does not extend to the functionality of use of the SEL-CAL signal with other equipment. Further, HAL
must disclaim any damage to the radio equipment or to the DXP38 which may result as a consequence of
user modification of his radio equipment.
2.2.6 RS-232 Gonnections
All data connections to your computer terminal are made via the 9-pin RS-232 connector. These
connections follow industry standards and pre-manufactured cables may be used to connect between the
PC's serial l/O port and the DXP38. lf you are writing your own software for the DXP38, please contact
HAL and request a copy of HAL Engineering Documents E2001 and E2005.The signal connections are
described in Table 2.5.
HA1981211 DXP38 MANUAL

CHAPTER 2INSTALLATION
Table 2.5
RS-232 Data l/O Connections
2-7
PIN LABEL SIGNAL
DCD Data Carrier Detect
RXD Receive Data
TXD Transmit Data
DTR Data Terminal Ready
GND Ground
DSR Data Set Ready
RTS Request To Send
CTS Clear To Send
N.C. no connection
OPERATION
High - Signal detected
Demodulated receive data
Data to be transmitted
High - PC is ready
Ground
High - DXP38 is ON
Hig[ = RXD Flow Control
High - TXD Flow Control
1
2
3
4
5
6
7
B
I
2.2.7 Ground Gonnection
It is very important that low-resistance RF ground connections be made between all units of the radio
transmit / receive station. Othenryise, transmitter RF interference (RFl) may severely limit operation of the
PC or the DXP38 modem. Similar[, high-frequency noise from the computer or modem may cause
severe interference when receiving. Ground connections should be short and have low resistance and
low inductance. Shield braid that is at least /+" wide is recommend for all RF ground connections.
2.2.8 DC Power Gonnection
The DXP38 may be operated from any DC power source that is filtered (free of hum and noise) and
relatively stable (shortterm voltage fluctuations less than !10%). The voltage output of the power source
should be between 9 to 1B VDC. Note that the positive terminal connects to the center pin. The DXP38
requires approximately 250 ma during normal operations, but reloading the flash memory requires
approximately 500 ma. Be sure to use the DC power connector supplied with the DXP38 or obtain an
exacf copy. There are many versions of the coaxial power plug offered for sale and most "look similar"
but may not be reliable. Contact HAL if you need a new or an additional power connector.
2.3 Initial Transmitter and Receiver Adjustment
The following procedure describes how to test the DXP38 with your radio equipment and make initial
adjustments. The set-up and test procedures used with DXP38.EXE are described below but you may
also wish to review your desired program in more detail (Chapters 3 and 4).
These adjustments take advantage of the "Test Mode" of CLOVER but the settings obtained apply to all
modes - RTTY, AMTOR, P-Mode, and CLOVER.
1. Connect the DXP38 AF lN, AF OUT, and PTT to the HF Radio Equipment. Disconnect the
microphone and any other transmitter audio inputs.
2. Connect the DXP38 RS232 connector to the PC's serial l/O connector.
3. Set the receiver and transmitter controls as follows:
a. BAND = convenient "RTTY frequency"
b. Mode = LSB
c. RX AF OUT = 25oh of maximum
d. RX FILTER = "Voice"
e. RF OUT = dummy load
f. TX AF lN (MlC GAIN) = minimum
g. TX RF OUT = minimum
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CHAPTER 2INSTALLATION 2-8
h. TX ALC and COMPRESSION = OFF
i. TXVOX = OFF
j. RIT / XIT = OFF
k. Antenna = dummy load
4. Load DXPWin or DXP38 (see Chapter 3 or 4)
5. Turn PC power ON and let it boot.
6. Select CLOVER mode.
7. Turn Transceiver AC Power ON.
8. Adjust RX AF GAIN control untilamplitude bars show movement on noise.
9. Enter TX TEST mode.
10. Type the [Space bart to set single{one test and turn the transmitter ON.
11. Stowly increase the MIC GAIN control (and TX RF OUT control if necessary) until the desired full RF
output power is obtained. Watch the ALC meter and/or light; set the RF Output tolusf below the level
at which ALC control starts. DO NOT CHANGE THIS MIC GAIN SETTING. See step 15 if the MIC
GAIN control must be set at the extreme low end of its range (near counter-clockwise end).
12. Switch the transceiver meter to read RF output and note the reading. This is the peak power output of
your transmitter when using CLOVER-Il.
13. Type the [Space barl again to enable four-tone test mode. Note the new reading of the RF Output
meter. This is the average power output of your transmitter.
14. Type [Space bar] once again to turn the transmitter OFF. Type [Altl-O or [Esc] to exit TEST mode.
The difference in RF output measured in steps 12and 13 varies greatly with the make and model of
the transceiver and the design of the Wattmeter circuit. Some meters may show no difference; others
may show as much as a 4:1 (6 dB) difference. The exact meter readings are not critical. However, it
is very important that the adjustment in step 11 sets the maximum non-ALC controlled power output
level of the transmitter.
IMpORTANT: Do nof increase the transmitter microphone gain control setting beyond that set in step
11. While this might cause the RF output meter to read higher output power, it will also assure that
your transmitted CLOVER signal is distorted and degrades system performance. Over-driving may
also results in wide-bandwidth "splatter".
15. The DXP38 transmit audio output level may be adjusted with the screwdriver set TX LVL control on
the rear panel. This control is set at the factory to its maximum output position. lf the setting of the
MIC GAIN control determined in step 10 is very low (near the CCW end), set the DXP38 rear panel
control to the middle of its range and then repeat steps 10 through 14. This will reduce the output
from the DXP38 and increase the setting of the transmitter's MIC GAIN control. Use the highest
setting of the DXP38 control that produces a usable setting of the transmitter's MIC GAIN control to
minimize "hum" and noise on the modulation.
16. Some transceiver models (lC-735 and possibly others) include a rear panel transmit audio input but
that its level is not adjustable by the front panel MIC GAIN control. lf this input is used, transmitter
H41981211 DXP38 MANUAL