Spectrum DSP M2 User Manual V1.1
• Available TX/RX modes in this firmware version: CW, USB, LSB, AM (full-carrier,
double-sideband) and FM. AM transmit and FM transmit/receive capabilities are
available ONLY if the “frequency translate” is activated (highly recommended!)
◦ FM options: Carrier (ultrasonic) squelch, subaudible tone encoding and decoding,
tone burst (“whistle up”) generation, “narrow” (+/-2.5 kHz) and “wide” (+/-5 kHz)
deviation and the selection of 7.2, 10, 12 or 15 kHz pre-detection receive
bandwidths.
◦ FM sensitivity for 12 dB SINAD, CCITT filtering:
▪ 7.2 kHz BW filter: -103.7 dBm (1.46uV) with 1 kHz tone at +/-1.5 kHz
▪ 10 kHz BW filter: -102.1 dBm (1.75uV) with 1 kHz tone at +/-1.5 kHz
▪ 10 kHz BW filter: -104.0 dBm (1.41uV) with 1 kHz tone at +/- 3kHz
▪ 12 kHz BW filter: -102.7 dBm (1.63uV) with 1 kHz tone at +/- 3kHz
▪ 15 kHz BW filter: -99dBm dBm (2.50uV) with 1 kHz tone at +/- 3 kHz
• CW mode receive/transmit and frequency display details: Nine modes of CW
display/shifting are available to emulate the various makes of radios and suit the user's
taste, ranging from no shifting, display-only shifting, display and LO shifting and
manual or automatic LSB/USB shifting.
• In CW mode “CW-L” or “CW-U”, is displayed depending on whether LSB or
USB is being used for reception.
• CW Speed range: 5-48 WPM.
• Available audio filter bandwidths in this firmware version: 300 Hz, 500 Hz, 1.8
kHz, 2.3 kHz, 3.6 kHz, with a “wide” filter of 5, 6, 7.5 or 10 kHz being selectable in all
modes except FM, where the filtering is done prior to demodulation as noted above.
All filters are software-defined and additional bandwidths could be made available.
• DSP Filtering Capability: Noise reduction and Automatic Notch Filter with adjustable
parameters. Notch filtering is disabled in CW mode for or when using a “wide” receive
bandwidth.
• S-Meter calibration: “Industry Standard” (IARU Region 1, Technical recommendation
R.1) S-meter calibration where S-9 = -73dBm (50.2uV @ 50 ohms) with each “S” unit
representing 6 dB. Units above S-9 are in dB units, as noted. For more information on
this calibration system see the article: http://en.wikipedia.org/wiki/S_meter
• External audio output connections: Headphone ports are 3.5mm 3-pin Jack
connectors to allow the connection to an external device. With these connectors it is
possible to interface with an external device (a computer or tablet/smart phone) and
operate “Sound Card” modes with the Spectrum DSP such as SSTV, PSK31, WSPR
and other analog/digital modes.
• CAT RS232 levels: 3.3V TTL. If RS232 are required, as for Elecraft KX3, an RS232
connector with converter is available.
• EXT input DIT/DAH signal levels: 3.3V TTL.
• Transmit ALC type: Look-ahead gain compressor with both pre-set and available
“custom” settings.
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