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I have a modulation mode:

  • (to be used for a satellite)
  • (of a series of AX.25 frames)
  • (in the 70 cm band)
  • 9.6 kbps
  • Ideally BPSK or QPSK modulation
  • but could be plain FM

Which I need to describe with an abbreviation from the table of modes recognised by our amateur radio regulator (in South Africa):

Table of mode descriptions

I suppose the same would apply to all packet radio operation, really.
Which mode fits best?

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3 Answers 3

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After a bit of google:

It seems J2D describes this mode best. The ITU says in this workshop document that J2D is

Single-sideband, suppressed carrier with single channel containing quantized or digital information for data transmission

Wikipedia has a more detailed table from which we could construct new mode names, G1B or G1D,

  • G (phase modulation)
  • 1 (single channel containing digital information, no subcarrier)
  • B (Electronic telegraphy, intended to be decoded by machine (radioteletype and digital modes))
    or
  • D Data transmission, telemetry or telecommand (remote control)

For digital modulation, I'm not sure it's worth separating Phase modulation from Frequency modulation.

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You can figure it out yourself using this wiki

Example: BPSK or QPSK would be J2B

[EDIT]

The other answer given is J2D or G1B / G1D, which is specifically for Data, and I must agree that is probably a better type indication.

This is totally dependent on how your protocol is structured, I guess.

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In our national frequency plan, sub bands reserved for digital data, including packet radio are marked as dedicated for modes A1D, A2D, F1D, F2D, J2D

A Amplitude modulation

F Frequency modulation

J SSB modulation

1 One channel containing digital information, no subcarrier

2 One channel containing digital information, using a subcarrier

D Data transmission

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    $\begingroup$ Could you provide a reference? $\endgroup$
    – rclocher3
    Aug 16, 2016 at 21:21
  • $\begingroup$ I could lot properly format text in comment so i updated answer. $\endgroup$ Aug 17, 2016 at 7:03

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