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Midnight Design Solutions NUE-PSK Operating Manual

Digital modem, for software version 5
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NUE-PSK Digital Modem
Operating Manual
(For software version 5)
The NUE-PSK Digital Modem is a standalone, battery-operated digital modem using
Microchip dsPIC technology. Weighing about 12 ounces and requiring only 60ma at 12V
DC, the modem is easily taken to the field. For easy visibility in high or low ambient
light, the NUE-PSK modem's backlit graphic LCD displays transmit and receive text
data, as well as band spectrum and tuning indicator. When coupled with a standard PS2
or USB keyboard and an SSB-capable transceiver, you can have an effective portable
digital mode station for PSK31, RTTY and CW modes, with a special Keyer mode for
"headless operating"! Optional internal USB card provides for saving QSO text files,
easy software updates, and real time clock.
NUE-PSK Digital Modem Operating Manual, ver 5
1
Copyright 2008-2012, Midnight Design Solutions, LLC

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  • Page 1 DC, the modem is easily taken to the field. For easy visibility in high or low ambient light, the NUE-PSK modem’s backlit graphic LCD displays transmit and receive text data, as well as band spectrum and tuning indicator. When coupled with a standard PS2...

  • Page 2: Table Of Contents

    17) Technical Support ..................25 SECTION 2: CW Mode Operation SECTION 3: CW Mode QuickStart Guide SECTION 4: RTCC Operation SECTION 5: Keyer Mode Operation SECTION 6: Keyer Mode QuickStart Guide NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 3 Ver 4.00 – Added: CW Operating Modes (Normal, Direct, Practice) and Morse Reader Ver 5.00 – Added Keyer Modes (for headless operating: user interface with Keyer input, Morse output) NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 4: Section 1: Basic Modem Operation

    But there’s hope! The NUE-PSK Digital Modem offers a unique way for hams to get on the air using the digital modes. No PC is required, thus enabling one to communicate using PSK31. This self-contained, hand-held modem connects to your SSB transceiver and allows you send and receive text data using the PSK31 digital mode.

  • Page 5: Specifications

    The USB port also can be used for easy software upgrades. The USB option includes an independently powered Real Time Clock Calendar. > Beacon Mode provides auto-repeating message buffer for far-signal measurement experiments. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 6: Power

    A USB keyboard may be used if it has built-in PS2 support. Most USB keyboards that are sold with a USB-to-PS2 adapter will work using this adapter. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 7: Operation

    “TUNE” at the top left of the display. The modem is now generating a continuous single tone, which is fed to the audio input of the rig. The PTT signal from NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 8: Rtty Operating Details

    RECEIVE. When in TRANSMIT mode, “TX” will appear at the top left of the display. 8) RTTY Operating Details Starting with software version 2.10, the NUE-PSK Digital Modem is now able support full RTTY transmit and receive. Use of the modem for this older-yet-still-popular digital mode is very similar to the other modes we support (PSK, QPSK), and is great for long ragchews, sending “brag files”...
  • Page 9  When using RTTY with your transceiver set to USB, the actual RF frequency is simply the addition of the transceiver setting plus the display frequency on the NUE-PSK modem. Further, most Digital modes (with the exception of RTTY) are usually run in USB.

  • Page 10: Using The "Download Config" And "Upload Config" Features

    19) who types a FIGS key followed by the H key, a pound sign (#) will be sent and displayed on the NUE-PSK display. Correspondingly from the NUE-PSK modem keyboard, pressing the # key will transmit the FIGS code followed by the H code (or just the H code if the FIGS code was previously sent) and the # character will be printed on the receive side.
  • Page 11 They are automatically "saved to EEPROM" such that each time the modem is started up in the future, the new settings will be in effect. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 12 USB chip, and a hardware modification is needed on the modem pcb for this feature to work for modems purchased prior to Feb 1, 2010. See the web page Using the USB Card (http://www.nue-psk.com/usb/using.html) and follow the steps described in the section Installing the USB Card for the hardware mod, and the section Programming the USB Card for installing the C02 firmware on the USB chip.
  • Page 13 NUE-PSK CONFIG --------------------------------------------------------------------- Configuration file for the NUE-PSK Digital Modem for device settings and macro strings. DESCRIPTION ... This file is generated by the 'Upload Config' selection in the modem's CONFIGURE menu, and is written to a USB flash drive inserted into the modem.

  • Page 14: Real Time Clock Calendar (Rtcc)

    PIC and start the clock programming.) 12) Macros a) General Macro Usage NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 15 This "beacon cycle" continues as long as the modem is powered (i.e., transmit F7 buffer, wait for Beacon Interval to timeout, transmit F7 buffer, ...)  Beacon mode may be turned off at any time by pressing Alt-F9. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 16: Configuration Menu

    This will record your choice, and the menu will revert to the top level, showing “Exit” as the default choice. You can now make additional changes or tap the Select button again to exit the Configuration menu. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 17 See a useful list of available menus and hot key assignments in the APPENDIX, along with a sample usage scenario for saving data to the USB device. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

  • Page 18: Updating Modem Software

    PC serial port to the modem using a simple adapter, and send it the new software obtained from the NUE-PSK website whenever new capabilities are made available. We designed a TTL serial port into the modem, accessible via a 4-pin connector P4 located inside the battery compartment.
  • Page 19 C drive. (When your computer prompts for the save location, enter C:\ 3) Download the latest modem software to your computer -- Download the software file modem2_10h.zip from the Software section on the website www.nue-psk.com, and place it in the same location as you did the prog program above.

  • Page 20: Capabilities And Usage Of The Optional Internal Usb Card

    “REC” displayed on the right side of the modem display and the LED on the USB port will start blinking rapidly, indicating that it is ready to receive any text that NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 21 Remove the USB device and plug it into your computer. You will notice a new file on the stick called NUE-PSK.TXT. If you open this file you will see the text that you typed while in Tx mode, and any other text that might have been displayed while in Rx mode.
  • Page 22 USB thumb drive. Just place the latest version of the modem software (in a special format, named mem.dat) onto your USB drive, as downloaded from the NUE-PSK website. This file is then automatically loaded into your modem. Thus, you no longer need to use a serial adapter to upgrade your modem software! 1) Download the modem software mem.dat to your computer from the Latest...

  • Page 23: Tips & Techniques, And "Things To Watch Out For

    16) Tips & Techniques, and “Things to Watch Out For” Here is a useful section that will undoubtedly grow in length over time. Please be sure to often check the NUE-PSK website for the latest online information. NUE-PSK Digital Modem Operating Manual, ver 5...
  • Page 24 PSK31 mode. Please be sure to read the corresponding section on the NUE-PSK website containing lots of tips on this topic. b) Inserting Plugs to the Modem – You will want to be sure that you fuly insert the Radio and Keyboard plugs into the connectors on the modem.

  • Page 25: Technical Support

    NUE-PSK. You can view all the messages posted there, and if you join (for free!), you will be able to post questions and comments yourself, as well as access the files in the group.

  • Page 26: Section 2: Cw Mode Operation

    3.1.4 Transmit Text Display ..................9 3.1.5 CW Macros ......................9 CW RECEPTION ....................10 3.2.1 SPACE Processing ................... 10 3.2.2 MARK Processing ..................... 11 3.2.3 Receive Text Display ..................12 NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 27 ENTERING THEIR CALL AND MY CALL .............. 17 SERIAL NUMBERS ....................19 KEYER INPUT ....................... 20 DEFAULT RECORD (LOG) FILE NAME ............... 21 BATTERY VOLTAGE DISPLAY ................21 NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 28: Introduction

    This section describes the CW operating mode. This added operating mode is implemented in firmware and is available with all hardware versions and options. Adding the CW operating mode to an existing NUE-PSK modem will only require a firmware update. Before getting into the details, some definitions are in order.

  • Page 29: General Description

    10, 5, 2, or 1 bucket from the keyboard. The modem also provides a tuning dial that can be rotated left or right to move the cursor down NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 30: Cw Reception

    The receive algorithm will try to accommodate variations in this timing but there are limits. (Some of the parameters used to define various CW elements can be tweaked NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 31: Cw Transmission

    All the processing functions are called from the main control loop, outside of any ISR. The CW control loop has two function calls. A state variable (cw_state) determines NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 32: Cw Transmission

    2,000 Hz. There is no volume control; however, the frequency response of the “speaker” is such that some frequencies sound much louder than others. Changing the side tone NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 33: Keyboard Input

    It is recommended that the operator not have more text queued for transmit than will fit in the transmit text area of the LCD display. This NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 34: Transmit Text Display

    They also do not require an ending space code to transmit the last word in the macro. If a macro does not end in a space code or <TXOFF>, a space code will be NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 35: Cw Reception

    LCD display. Note that the wpm will not be displayed until at least one character has been received and Tcw can be calculated. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 36: Mark Processing

    To avoid skewing these results when long strings of DOTs or DASHs are received, all repeated Morse elements after a specific number (the zkew limit) are left out of the NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 37: Receive Text Display

    Unrecognized (invalid) Morse characters are displayed as a single asterisk (‘*’). When a character overflows the 8-entry MARK buffer the buffer is cleared and a pound sign (‘#’) is displayed. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 38: Spectrum Display

    Received data continues to be displayed on the lower four lines of the LCD display. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 39 Char. When the operator tries to change a parameter to a value outside the displayed range, the parameter is restrained to the displayed limit. When Char NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 40 The following options are available: 100 Hz 125 Hz 160 Hz 200 Hz (Default) 250 Hz 400 Hz 500 Hz 800 Hz 1000 Hz NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 41: Configuration

    2 and 10. The side tone frequency is equal to 4000/N Hz, where N is the parameter. This gives the following frequency options: FREQ 400 Hz 444 Hz 500 Hz 571 Hz 666 Hz 800 Hz 1000 Hz 1333 Hz 2000 Hz NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 42: Other Changes

    This is especially convenient for entering Their Call since it leaves the received call sign displayed while it is being entered. The modem continues to receive and display characters NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 43 Enter or Ctrl-Z. They both clear the current display but Enter will also unlock the Word, Char, and Th parameters if they are locked when Enter is pressed. Ctrl-Z will not unlock NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 44: Serial Numbers

    ‘X’ or ‘x’ while in receive state. The display is as follows: “2011-09-14 13.5 V. 26 WPM 17:48:16” “ S/N: 123 ” “ N2APB ” “ |_^_| ” NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 45: Keyer Input

    This feature was added primarily as a test and debug aid for developing the CW decode logic but it would have some value as a CW training and / or demonstration aid. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 46: Default Record (Log) File Name

    This is the input voltage range specified for the modem’s five volt regulator. “2011-09-14 8.8 V. 26 WPM 7:48:16” “ ” “ ” “ |_^_| ” NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 47 Section 3: CW Mode QuickStart Guide Requirements:  NUE-PSK Digital Modem with firmware version 4.00 or higher installed.  Single-Side-Band transceiver operating in SSB USB or DIGITAL mode – NOT CW MODE!  Reasonably strong CW signal preferably keyed by a PC or a good quality keyer.
  • Page 48 My Call. Their call is stored in volatile RAM and will not be saved and restored when power is cycled. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 49 Tags are replaced with the current corresponding value/text when the macro is played. I hope you enjoy your new CW operating mode and bag lots of DX. Dave Collins – AD7JT NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 50 Date and Time Display ....................9 3.3.2.1 RTCC Updates by the User ..................10 3.3.2.2 Basic, Standalone RTCC Modem Functions ............11 3.3.2.3 Time Stamping QSO Recording Files ..............11 3.3.2.4 NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 51: Introduction

    INTRODUCTION This section describes the Real Time Clock Calendar (RTCC) option for the NUE-PSK USB add-on card. The basic hardware design for this option has been included in all versions of the USB add-on card PCB layout. The RTCC option was not included in the early releases of the modem firmware and the add-on cards (assemblies and kits) were shipped without the RTCC components.

  • Page 52: Functional Description

    RTCC UART transmit line (TX2) to the modem controller receive line (TX). This switch is controlled by PA1. The fourth switch position is not used. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 53: Khz Crystal

    All messages to and from the RTCC controller are ended with a CR character (0x0D) which is consistent with the USB controller protocol. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 54 The receive operation is timed by the RTCC and if the end of message character (CR) is not received within about 1.5 ms, the communication is aborted and the RTCC controller returns to sleep mode. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 55: Firmware

    3.3 FIRMWARE The RTCC option requires firmware development in two areas: implementation of the RTCC controller firmware and modifications or extensions to the modem controller firmware. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 56: Rtcc Firmware Implementation

    To compensate for any long-term drift there may be in the system, the calibration sequence NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 57: Time And Date Update Sequence

    When a valid break sequence is detected, the RTCC disconnects the USB controller from the serial interface and waits for the request message from the modem controller. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 58: Modem Firmware Extensions

    RTCC is updated by the modem using a local, one-second timer. Once the modem exits REC mode, the RTCC is again available and the local copy is updated with the RTCC responses. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 59: Rtcc Updates By The User

    The values input are checked and must be valid for that field. If the number of characters input is not exactly 10 or the slash characters are not input or the NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 60: Basic, Standalone Rtcc Modem Functions

    The recording format for flash drives has been enhanced with additional information including date and time. At the start of each recording session (initiated by Ctrl-U) the following text block is written to the file: NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 61 RECEIVING or TRANSMITTING preamble. Following the heading text block, the appropriate preamble is also inserted in the recording. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 62 CW Keyer Manual (and other functional enhancements) NUE-PSK Modem Version 5.00 David Collins – AD7JT 29 November 2011 Version 5.01 03 February 2012 Version 5.02 10 June 2012 Version 5.02b 25 February 2013 Page 1 of 31...
  • Page 63 Table of Contents INTRODUCTION ........................... 4 GENERAL DESCRIPTION ........................4 INTERFACE CONNECTIONS ......................5 TRANSMIT OPERATION ......................... 6 RECEIVE OPERATION ........................7 FUNCTIONAL DESCRIPTION ......................8 EXTERNAL (PRACTICE) KEYER INPUT PROCESSING ............9 BUILT-IN KEYER INPUT PROCESSING ..................9 KEYER SIDE TONE ........................10 KEYER ESCAPE CODE ........................
  • Page 64 CONFIGURATION MENU OPTIONS ....................22 KEYER MODE SELECTION ......................22 CW PADDLE REVERSE ......................... 22 PSK AND RTTY TEXT ENTRY FROM CW KEYER ..............22 SERIAL INTERFACE BAUD RATE CALIBRATION ..............23 APPENDIX A. MORSE CODE ENCODING WITH PROSIGNS AND ASCII EQUIVALENTS..25 APPENDIX B.

  • Page 65: Introduction

    The built-in keyer implementation makes it possible to operate the modem without requiring a keyboard. This document assumes that the reader is familiar with the CW Mode Operating Section of the NUE-PSK Digital Modem Operating Manual (for firmware version 4).

  • Page 66: Interface Connections

    INTERFACE CONNECTIONS The major digital modem system components are shown in the following diagram: A common interface of two signal lines plus ground is used to interface either a CW paddle or an external keyer to the modem. The signal lines are labeled “DIT” and “DAH” and must be connected to the dsPIC expansion pads ‘b’...

  • Page 67: Transmit Operation

    requiring a paddle will be disabled, and the CW practice mode will be enabled. (Note that this will also be true if nothing is plugged into the keyer jack.) In this case, expansion pad ‘b’ (DIT) will be assumed to be driven by an external keyer and expansion pad ‘a’...

  • Page 68: Receive Operation

    Scan Code ASCII to Keyboard Processing Morse Modu LCD Graphic Macro EEPROM Display Transc Playback USB Option BUILT-IN Morse to Flash Card KEYER ASCII Process Hot Keys EXTERNAL CW After the firmware determines whether an external CW paddle or an external keyer is plugged into the PADDLE keyer connector, it sets up the appropriate routing through the functional firmware blocks.

  • Page 69: Functional Description

    Goertzel Tweaking Fence Tweaking Level Tune Bandpass Character Word Audio from PGA and Goertzel Mark Transceiver Filter Grouping Morse to LCD Graphic BUILT-IN ASCII Display KEYER USB Option Process Hot Flash Drive Card Keys Scan Code Keyboard Processing The same blocks are used to generate MARK character groups in receive mode as are used in transmit mode as described above.

  • Page 70: External (Practice) Keyer Input Processing

    characters. As the keyer input is processed, a side tone is generated to give the user audio feedback. When using the keyer the user will normally have the transmit side tone turned off. EXTERNAL (PRACTICE) KEYER INPUT PROCESSING The same firmware used to group MARKs from the Goertzel filter is used to generate MARK groups from an external keyer.

  • Page 71: Keyer Side Tone

    IAMBIC KEYER MODE PADDLE SQUEEZE ACTION Iambic-A Alternate dots and dashes, immediate end Iambic-B Alternate dots and dashes, one element added Dot Preferred Repeated dots Dash Preferred Repeated dashes Ultimatic Repeat last selected In iambic-A mode, the alternate dot - dash generation will terminate as soon as the keyer senses one or both of the inputs are inactive.

  • Page 72: Keyed Common Functions

    hotkey sequences, the prosign “hH” (eight or more dots) will be processed as a backspace. The preceding character will be deleted. Note that the starting DLE character cannot be deleted. To cancel a hotkey sequence after it is started, simply key in an illegal character sequence followed by the closing DLE character.

  • Page 73: Keyed Transmit Functions

    KEYED TRANSMIT FUNCTIONS The following hotkey functions are available in Tx mode: KEYBOARD KEYER HOTKEY FUNCTION Toggle Tx side tone ON/OFF Shift Change case of next PSK text character entered with the keyer. Insert Beacon Count Alt-K \AK\ Insert My Call (“or”) Alt-M \AM\ or mc Insert Name...

  • Page 74: Keyed Receive Functions

    KEYED RECEIVE FUNCTIONS The following hotkey functions are available in Rx mode: KEYBOARD KEYER HOTKEY FUNCTION Toggle Rx side tone ON/OFF * Tweak CW Bandwidth * \B\ or B Tweak Character space multiple * \C\ or C Tweak Goertzel Threshold * G or T \G\ or G Tweak Serial Number...

  • Page 75: Keyed Macro Functions

    Note: Prosigns in DLE sequences can be keyed as discrete characters. Therefore “\bk\” may be keyed as “\BK\”, “\ar\” may be keyed as “\AR\”, and “\do\” may be keyed as “\DO\”. Prosigns not in DLE sequences must be entered without the intra character SPACE. KEYED MACRO FUNCTIONS Entering and deleting macros with the keyer are not supported in this release.

  • Page 76: Cw Practice Mode

    An additional field has also been added to the Tx display to identify the current operating mode. The operating mode is displayed as: “BPSK”, “QPSK”, “QPSK/R”, “RTTY”, “CW”, or “CWD”. When the keyer is not enabled, the TX display line will be truncated immediately after the operating mode field. CW PRACTICE MODE Since some of the operating procedures to perform all the modem functions from the keyer are new, a practice mode is included in this firmware release to help the user get familiar with them.

  • Page 77: Interface Cable

    7.2.1 Interface Cable CW DIRECT may require a special cable to connect the modem PTT line (J3, pin 8) to the rig’s key-in jack and the modem audio input interface line to the rig’s audio-out jack. This cable will only work in CW DIRECT mode.

  • Page 78: Transmit Side Tone Tweak

    The keyer side tone will, however, be activated automatically when entering DLE sequences which are not generally transmitted so they cannot be heard with the transceiver’s side tone. If the DLE sequence is started by entering the DLE prosign with the built-in keyer, the prosign (uU) will be transmitted because the modem firmware cannot recognize the DLE prosign until it has been fully keyed.

  • Page 79: Enter Rtcc Date (Ctrl-D) Display Relocation

     File names can have no more than one period in them. During file name editing, no key will be accepted that would make the displayed file name invalid. Attempting to do so will result in a beep. If an improperly formatted file name is entered into the EEPROM from a CONFIG.TXT file and is used without editing it (Ctrl-N), the VNC1L will accept the file name and truncate it to the longest valid file name format possible.

  • Page 80: Enter Rtcc Time (Alt-D) Display Relocation

    ENTER RTCC TIME (Alt-D) DISPLAY RELOCATION The Enter RTCC Time function display area has been moved to the upper right quadrant of the LCD. This allows the function to be performed without interrupting an in-process Rx operation. It also allows the RTCC time to be entered/edited using either the keyboard or the keyer.

  • Page 81: Automatic Frequency Control (Afc) Indicator

    AUTOMATIC FREQUENCY CONTROL (AFC) INDICATOR When the AFC is enabled (Ctrl-A) “AFC” will be displayed on the top line of the LCD. This display area will be blank when AFC is disabled. SAVE TEXT ON SWITCH FROM Rx TO Tx Previous firmware versions clear the text area of the LCD on any change between Rx and Tx modes.

  • Page 82: Macro Operation

    7.11 MACRO OPERATION Text may be entered while a macro is playing. In CW mode, the macro text will stop displaying and the entered text will be displayed with the over line indicating it has not been transmitted. After the macro has completed, the entered text will be transmitted and the over lines removed as each character is transmitted.

  • Page 83: Configuration Menu Options

    The Name text string is stored in volatile memory and is cleared every time modem power is turned on. It is a convenient way to “remember” the name of the operator at the other end of the QSO but it can also be used for any text string to be inserted in transmit text such as the received exchanges during a contest.

  • Page 84: Serial Interface Baud Rate Calibration

    allow selection of the default case for PSK text entered with the keyer. A new prosign has been defined (im) to provide a single-character shift function. When entering text for PSK transmission, the default case will be used to generate ASCII characters. When the shift prosign is entered, the character immediately following the prosign will be shifted and the ASCII character will have the opposite case.
  • Page 85 The baud rate generator has two modes of operation, high-speed and low-speed. To generate the 115,200 Hz baud rate in low-speed mode, the BRG value should be about 21 which should result in an error of less than 2%. Finer control is available with the high-speed mode but, according to Microchip, there may be problems maintaining synchronization with received data when the BRG is operating in high-speed mode.
  • Page 86 APPENDIX A. MORSE CODE ENCODING WITH PROSIGNS AND ASCII EQUIVALENTS. STANDARD MORSE ENCODING AND ASCII EQUIVALENTS CHAR MORSE PROSIGN CHAR MORSE 0x20 0x40 W SPACE .--.-. 0x21 0x41 0x22 0x42 " .-..-. -... 0x23 0x43 -.-. 0x24 0x44 0x25 0x45 0x26 0x46 &...

  • Page 87: Appendix A. Morse Code Encoding With Prosigns And Ascii Equivalents

    ..--.- -.--. oK, Named-station Kalled statioN only ...-.- Silent Key end of contact ...-. Sho' 'Nuff understood NON-STANDARD PROSIGNS USED BY THE NUE-PSK DIGITAL MODEM MORSE PROSIGN MEANING DESCRIPTION ..-..- Start/End DLE Sequence Keyed modem hot keys ..-.--. Tweak up -..---...

  • Page 88: Appendix B. Eeprom Content Map

    APPENDIX B. EEPROM CONTENT MAP (HEX) CONTENT ENTER CHARS 00000 's' (indicates saved config is valid) 00001 CFG1 (PGA + mMode) 00002 CFG2 (BL + SQTH + AFC + CWID) 00003 CFG3 (CW side tone enables and RTCC display enable flags) 00004 CW TX Speed (05 –...
  • Page 89 APPENDIX B. EEPROM CONTENT MAP (cont.) Configuration byte bit and field definitions: ADRS BYTE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00001 CFG1 OPERATING MODE 00002 CFG2 SQTH CWID PSK CW 00003 CFG3 Text...

  • Page 90: Appendix C. Hot Key Assignments

    APPENDIX C. HOT KEY ASSIGNMENTS - - - Ctrl- Alt- Enable AFC Disable AFC CW Goertzel Bandwidth Clear internal buffers CW Char SPACE fence Toggle RTTY FIGS Tweak Down Enter date Enter Time Save freq in EEPROM Retrieve saved freq CW Goertzel threshold Reset Entry (CANCEL, DLE only)
  • Page 91 - - - Ctrl- Alt- Toggle settings display Display current freq Pg-Up Increase PGA gain Pg-Dn Decrease PGA gain Acquire Home Reset Entry (CANCEL) L-Arrow Tune down x 1 Tune down x 5 R-Arrow Tune up x 1 Tune up x 5 D-Arrow Tune down x 2 Tune down x 10...

  • Page 92: Appendix D. Configuration Menu

    APPENDIX D. CONFIGURATION MENU CONFIGURE MENU CONFIGURE MENU CATEGORY SELECTIONS CATEGORY SELECTIONS TX Audio Exit %= (0 - 1096) Level BPSK Backlight QSPK Flash Abort QPSK/R Bootload Start Bootload Mode RTTY Abort PC Bootload Start Bootload Beacon CW Direct 0 to 13700 Interval Seconds CW Practice...
  • Page 93 SSB tone generation. Many modern transceivers have a setup option where the transceiver’s keyer and the data input share a common PTT line. CW Direct mode can be used with these transceivers without requiring a different NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 94 This section contains references to the CW Keyer Manual. You can (and should) download this document from the NUE-PSK web site. It is your main reference for Version 5. Many new capabilities are present in the Version 5 software, so it would be a good idea to play with it for a while before going online.
  • Page 95 S/N display. In this mode, entering eight or more dots (‘hh’ or error code) will simulate a single backspace. Keying this prosign in five times will completely erase my call sign. My call sign can also be erased by keying NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 96 Some of the tweaking functions only apply to CW mode so those displays cannot be activated in other operating modes. Now go have a ball with your newly updated, Version 5.00 NUE-PSK Digital Modem! NUE-PSK Digital Modem Operating Manual, ver 5...
  • Page 97 Section 7: APPENDICES Appendix A: The Radio Cable This diagram represents what is shipped with your NUE-PSK modem. Since the modem can interface with literally hundreds of different SSB transceivers, it will be necessary for you to connect the “unfinished end” of the Radio cable to properly interface with your specific radio.
  • Page 98 Appendix B: Modem Schematic NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 99 Appendix C: Optional USB+RTCC Card Schematic (rev B2a) NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 100 Calling -.-.- Commence Transmission start of message ..error HuH? ..--.- -.--. oK, Named-station Kalled statioN only ...-.- Silent Key end of contact ...-. Sho' 'Nuff understood NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 101 0x57 --... 0x38 0x58 ---.. -..- 0x39 0x59 ----. -.-- 0x3A 0x5A ---... --.. 0x3B -.-.-. é 0x60 ..-.. 0x3C < 0x3D -...- 0x3E > 0x3F ..--.. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 102 ..--.- -.--. oK, Named-station Kalled statioN only ...-.- Silent Key end of contact ...-. Sho' 'Nuff understood NON-STANDARD PROSIGNS USED BY THE NUE-PSK DIGITAL MODEM MORSE PROSIGN MEANING DESCRIPTION ..-..- Start/End DLE Sequence Keyed modem hot keys ..-.--. Tweak up -..---...
  • Page 103 Displays a numerical representation of FFT buckets 18, 19, and 20. Increment selected parameter ..+1 or _: Decrement selected parameter ..-1 Enter: Clears parameter display. Toggles RX side tone on and off. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 104 666, 800, 1000, 1333, and 2000 Hz (4000/N where N is an integer between 10 and 2, inclusive). Toggles TX side tone and TX side tone display on and off. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 105 (unassigned) 14336 Note: Address range is shown for 24AA256. Some modems use 24AA1025 which has four times the capacity but the modem only uses the first quarter. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 106 RTTY_MODE CW_MODE (PSK63_MODE) CW_DIR_MODE (CW_PRACTICE) Note: Modes shown in parentheses are used internally and are not entered in the EEPROM. They are shown here for reference only. NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...

  • Page 107: A (Cw_Practice)

    HERE IN SUN CITY WEST, AZ (NW SUBURB OF PHOENIX) NAME HERE IS DAVE DAVE. HOW COPY? <THEIRCALL> DE <MYCALL> K<TXOFF>| 13) Macro 5: RIG HERE IS YAESU FT-897D RUNNING ABOUT 40 WATTS CONTROLLED BY A NUE-PSK DIGITAL MODEM WITH NO PC.
  • Page 108 ALSO USING A NUE PSK MODEM WITH NEW CW MODE I AM TESTING. HOW DOES IT SOUND? <THEIRCALL> DE <MYCALL> kn <TXOFF>| 29) CW Macro 7: | NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2011, Midnight Design Solutions, LLC...
  • Page 109 Record macro 7 Delete macro 7 Toggle TUNE mode Save_Macro (0x1A) Beacon ON Beacon OFF Toggle Rx & Tx Display My Call Toggle settings display Display current freq NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...
  • Page 110 Tune up x 5 D-Arrow Tune down x 2 Tune down x 10 U-Arrow Tune up x 2 Tune up x 10 Toggle CW Side Tone (TX or NUE-PSK Digital Modem Operating Manual, ver 5 Copyright 2008-2012, Midnight Design Solutions, LLC...

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