Digital Modem NUE-PSK

Midnight Design Solutions; Loudon, TN

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  • Year
  • 2008
  • Category
  • Amateur Equipment (Other, but not Key)
  • Radiomuseum.org ID
  • 341721

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 3
  • Main principle
  • DSP, Digital Signal Processor
  • Wave bands
  • - without
  • Power type and voltage
  • Batteries / addl. power jack / 2 x 9 or 9 to 18 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Digital Modem NUE-PSK - Midnight Design Solutions;
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 6.75 x 1 x 4 inch / 171 x 25 x 102 mm
  • Notes

  • The NUE-PSK is a small 7" x 4" x 1" standalone, battery-operated digital modem using a graphic display for transmit and receive text data, as well as for showing band spectrum and tuning. Just plug in a standard PS2 keyboard and connect to an SSB-capable transceiver like the FT-817 or the PSK-xx transceivers from Small Wonder Labs, and you'll have an effective digital mode station that goes absolutely anywhere.

     

        The NUE-PSK modem is an "open" design, with published hardware details and software source code.  What this means is that many others can contribute to the modem's capabilities and modes of operation.  Already we have a "USB add-on option" that maintains the current time and date, and lets you record the QSO (with a timestamp) to a USB stick for archival or EmComm use. 

     

        Further, the modem has the ability to be "field upgraded" by using a serial port (or USB thumb drive) to load new versions of the modem software.  The NUE-PSK Modem supports BPSK (PSK-31), QPSK, RTTY and CW. 

     

    Specifications

    Standalone, half-duplex modulator/demodulator for amateur radio digital mode communications

    Handheld unit ... no PC required

    Menus select operating modes, Squelch Thresh, PGA Gain, CW ID

    128 x 64 pixel graphic LCD displays audio signal spectrum 500 Hz to 2.5 kHz (with backlight)

    Tx and Rx buffers and menu system displayed in lower half of LCD using four 20-character lines of text

    Tune controls modem position along audio spectrum

    Modes currently supported: BPSK31, QPSK, QPSK reversed  External keyboard jack: 6-pin mini-DIN, PS2-compatible

    Standard PS2-style or dual-mode USB/PS2 keyboard (user-supplied) provides text input for Tx entry, command/mode selection and modem frequency adjustment

    Connection to SSB transceiver: 8-pin mini-DIN (audio in, audio out, PTT, power)

    Powered by two internal 9V batteries (not included) or an externally-applied supply via 2.1mm coaxial jack

    Power requirements: 9-18V DC.  Current at 12V is 60 ma without backlight, 80mA with backlight.  The current decreases as input voltage is increased.

    Field reprogrammable to allow software updating in the field by the owner

    Aluminum enclosure provides for rugged portable use while shielding transceiver from digital EMI

    Enclosure dimensions: 7" x 4" x 1"

    Single 3.75" x 5.25” pc board contains all components and connectors

    Lightweight: < 1 lb with batteries.

    Control for precise audio level control to transceiver 

    Cable assembly provided (plug and shielded cable) for connection to the SSB transceiver

    Optional USB Card provides ability to record transmit and receive text from QSOs for archival and printing.  Also serves as serial adapter port for connection to PC for upgrading modem software, and for uploading/editing/downloading file with modem settings and macro text strings.

  • Net weight (2.2 lb = 1 kg)
  • 0.12 lb (0 lb 1.9 oz) / 0.054 kg
  • Price in first year of sale
  • 199.00 US
  • Mentioned in
  • QST (March, 2008)
  • Literature/Schematics (1)
  • -- Schematic
  • Literature/Schematics (2)
  • NUE-PSK Digital Modem Operating Manual, Midnight Design Solutions, 2008-2012
  • Author
  • Model page created by Greg Hubbard. See "Data change" for further contributors.

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