priyom.org

Experimental Modes

Since 2008, the Russian 7 operator has possessed a digital system containing many multicarrier PSK and FSK waveforms. While this system has been active semi-regularly for many years, it is considered experimental for the following reasons:

  • Lack of use on long-term regular schedules following the standard habits of this operator.
  • Activity in groups of daily, hourly transmissions, each made using a different mode. Such groups typically include XPA and XPA2 as well.
  • Mode variants appearing and disappearing over the years.
Mode Spectrogram Sample Notes Since
8 x 62.5 Bd QPSK
+ 250 Bd BPSK

Data: N blocks, each of the following structure:

  1. 512 ms of 250 Bd BPSK on one of five different subcarriers, chosen randomly.
  2. 12288 ms of eight parallel 62.5 Bd QPSK streams.
 2008
2 x 62.5 Bd QPSK
+ 250 Bd BPSK

Data:  N blocks, each of the following structure:

  1. 512 ms of 250 Bd BPSK on one of five different subcarriers, chosen randomly.
  2. 12288 ms of two parallel 62.5 Bd QPSK streams.
 2019
8 x 62.5 Bd QPSK

Intro: Two-second two-tone sequence repeated for two minutes.

Data: Eight parallel 62.5 Bd QPSK streams, in 12288 ms blocks.

 2018
2 x 62.5 Bd QPSK

Intro: Two-second two-tone sequence repeated for two minutes.

Data: Two parallel 62.5 Bd QPSK streams, in 12288 ms blocks.

 2008
5 x 10 Bd 16FSK
+ 250 Bd BPSK

Data: N blocks, each of the following structure:

  1. 512 ms of 250 Bd BPSK on one of five different subcarriers, chosen randomly.
  2. 9600 ms of five parallel 10 Bd/20 Hz 16-tone MFSK streams.
 2013
10 Bd 16FSK
+ 250 Bd BPSK

Data: N blocks, each of the following structure:

  1. 512 ms of 250 Bd BPSK on one of five different subcarriers, chosen randomly.
  2. 9600 ms of 40 Bd/40 Hz 16-tone MFSK.
 2016
10 Bd 16FSK
+ 125 Bd BFSK

Data: N blocks, each of the following structure:

  1. 512 ms of 125 Bd/250 Hz BFSK.
  2. 512 ms of 125 Bd/62.5 Hz BFSK.
  3. 9600 ms of 10 Bd/40 Hz 16-tone MFSK.
 2016
~15.625 Bd BFSK

An idle signal that carries no data.

Structure: A 2000 Hz tone (63.75 ms) followed by a 1000 Hz tone (64 ms), repeated altogether for 3 minutes.

 2015