The compact DR-7400 P4dragon HF/SSB modem offers a lower-priced entry to the P4dragon modem class.

The petite DR-7400 has been optimzed for the best-in-class data transmission mode PACTOR-4 (P4). P4 gives unparalleled fast and robust data links via HF/SSB radio . Email feels almost like at the office - from any point on earth.

The DR-7400 is software compatible with the SCS PTC series of modems so existing PACTOR software (Airmail, RMS Express, Alpha etc) can continued to be used. The elegant design as well as the easy upgrade possibilities (free updates!) complete the concept of the “Little Dragon“. Of course, the DR-7400 also provides TRX remote control, a GPS input and an (optional) Bluetooth interface.

DR-7400 P4dragon

• Operating modes:  PACTOR-4, PACTOR-3, PACTOR-2, PACTOR-1, WE-FAX (Receive), GPS/RTTY/NAVTEX decoder
• Processor:  Quadcore DSP from Freescale, 6400 MIPS, 64 Bit
• Connections:  USB (opt. Bluetooth), GPS (RS232 and TTL), radio AF / PTT (PTC-II compatible), radio-remote control (all usual transceiver types)
• Audio Input level/imp:  Max 3 V p-p, 47 k?,
• Audio Output level/imp:  Max 4.5 V p-p, 1 k?, both asymmetrically
• Display:  8 dual-color LED’s (green, red) indicating all important operating states and signal tuning
• Power supply:  10 – 25 V, typically 300 mA, max 400 mA at 10 V supply voltage
• Weight / size:  450 g, 125 x 43 x 138 mm (width, height and depth)

PACTOR 4

• Data throughput:  Maximum 5512 bps without compression. Approx 10500 bps with PMC using text. This is reached with approx +16 dB @ 4 kHz in an AWGN channel. Under the usual channel conditions this is 1.5 – 3 times faster than PACTOR 3
• Compatibility:  Backward compatible to PACTOR-1/-2/-3. Automatic negotiation during link setup. Noticeably improved performance with PACTOR 2 and PACTOR 3
• ARQ protocol:  Synchronized, similar to PACTOR 3, except 10 instead of 6 speed levels (“Waveforms”) and faster switching. Bandwidth is always smaller than 2400 Hz.
• Channel equalization:  Iterative adaptive equalizer for the coherent speed levels (5 – 10), RAKE receiver with maximum ratio combination for the splayed speed levels (2-4).  Real-time multitasking operating system.