FSQ - Signal Identification Wiki

FSQ
Frequencies3.58 MHz,7.104 MHz,10.149 MHz
Frequency Range3.58 MHz - 10.149 MHz
ModeUSB
ModulationIFK+
ACF
Emission Designator
Bandwidth300 Hz
LocationWorldwide
Short DescriptionFast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015.
I/Q Raw Recording
Audio Sample

Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. FSQ is used on HF on fixed frequency channels. VHF adaptions of FSQ are also supported using VHF FM. FSQ uses IFK+ and has efficient alphabet encoding as well as no need for syncing to receive. The FSQ modulation, coding and FSQCall protocol are publicly disclosed and described, and the software is open source.

FSQ is intended for fixed frequency (channelized) operation, with dedicated calling frequencies. It isn't intended as a 'tune around to see what you can find' mode!

Characteristics

FSQ is essentially a speeded-up version of the weak-signal mode WSQ2, introduced in 2013. It also uses 33 tones, in this case spaced 9Hz apart (actually 8.7890625 Hz, exactly 1.5 x the baud rate at the highest speed), resulting in a signal bandwidth of 300Hz, including the keying sidebands. The ITU Emission Designator is 300HF1B. The modulation is constant amplitude, phase coherent MFSK, using IFK+ coding with 32 frequency differences, yielding 32 unique codes. This means that each symbol carries enough information for all lower case letters to be expressed in just one symbol, which greatly enhances the speed.

Some key features of FSQ:

  • IFK+, providing drift-proof operation and good tolerance of multi-path interference.
  • Efficient Alphabet, where most letters and punctuations can be sent in just 1 symbol.
  • No synchronization required for decoding, allowing fast acquisition of signal
  • Arbitrary transmission speed, allowing transmission and reception of baudrates at any rate between 2-6 Bd, without requiring adjustment on the receiver's side.
  • Chat operation, behaves like a messaging app.
  • Supports selective calling functions,telemetry,image transfer, and file transfer functions.

Samples

Frequencies

Region 1

  • 80m 3588 kHz USB (sunset to sunrise)
  • 40m 7044 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 2

  • 80m 3594 kHz USB (sunset to sunrise)
  • 40m 7104 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 3

  • 80m 3580 kHz USB (sunset to sunrise)
  • 40m 7105 kHz USB (sunrise to sunset)
  • 30m 10149 kHz USB (local day, DX night)

Decoding Software

Hobby Level Software

  • FSQCall
  • fldigi---
    title: "FSQ - Signal Identification Wiki"
    source: "https://www.sigidwiki.com/wiki/FSQ#Decoding_Software"
    author:
    published:
    created: 2025-02-18
    description: "Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015."
    tags:
    • "clippings"

FSQ
Frequencies3.58 MHz,7.104 MHz,10.149 MHz
Frequency Range3.58 MHz - 10.149 MHz
ModeUSB
ModulationIFK+
ACF
Emission Designator
Bandwidth300 Hz
LocationWorldwide
Short DescriptionFast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015.
I/Q Raw Recording
Audio Sample

Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. FSQ is used on HF on fixed frequency channels. VHF adaptions of FSQ are also supported using VHF FM. FSQ uses IFK+ and has efficient alphabet encoding as well as no need for syncing to receive. The FSQ modulation, coding and FSQCall protocol are publicly disclosed and described, and the software is open source.

FSQ is intended for fixed frequency (channelized) operation, with dedicated calling frequencies. It isn't intended as a 'tune around to see what you can find' mode!

Characteristics

FSQ is essentially a speeded-up version of the weak-signal mode WSQ2, introduced in 2013. It also uses 33 tones, in this case spaced 9Hz apart (actually 8.7890625 Hz, exactly 1.5 x the baud rate at the highest speed), resulting in a signal bandwidth of 300Hz, including the keying sidebands. The ITU Emission Designator is 300HF1B. The modulation is constant amplitude, phase coherent MFSK, using IFK+ coding with 32 frequency differences, yielding 32 unique codes. This means that each symbol carries enough information for all lower case letters to be expressed in just one symbol, which greatly enhances the speed.

Some key features of FSQ:

  • IFK+, providing drift-proof operation and good tolerance of multi-path interference.
  • Efficient Alphabet, where most letters and punctuations can be sent in just 1 symbol.
  • No synchronization required for decoding, allowing fast acquisition of signal
  • Arbitrary transmission speed, allowing transmission and reception of baudrates at any rate between 2-6 Bd, without requiring adjustment on the receiver's side.
  • Chat operation, behaves like a messaging app.
  • Supports selective calling functions,telemetry,image transfer, and file transfer functions.

Samples

Frequencies

Region 1

  • 80m 3588 kHz USB (sunset to sunrise)
  • 40m 7044 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 2

  • 80m 3594 kHz USB (sunset to sunrise)
  • 40m 7104 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 3

  • 80m 3580 kHz USB (sunset to sunrise)
  • 40m 7105 kHz USB (sunrise to sunset)
  • 30m 10149 kHz USB (local day, DX night)

Decoding Software

Hobby Level Software

Additional Images---

title: "FSQ - Signal Identification Wiki"
source: "https://www.sigidwiki.com/wiki/FSQ#Decoding_Software"
author:
published:
created: 2025-02-18
description: "Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015."
tags:

  • "clippings"

FSQ
Frequencies3.58 MHz,7.104 MHz,10.149 MHz
Frequency Range3.58 MHz - 10.149 MHz
ModeUSB
ModulationIFK+
ACF
Emission Designator
Bandwidth300 Hz
LocationWorldwide
Short DescriptionFast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015.
I/Q Raw Recording
Audio Sample

Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. FSQ is used on HF on fixed frequency channels. VHF adaptions of FSQ are also supported using VHF FM. FSQ uses IFK+ and has efficient alphabet encoding as well as no need for syncing to receive. The FSQ modulation, coding and FSQCall protocol are publicly disclosed and described, and the software is open source.

FSQ is intended for fixed frequency (channelized) operation, with dedicated calling frequencies. It isn't intended as a 'tune around to see what you can find' mode!

Characteristics

FSQ is essentially a speeded-up version of the weak-signal mode WSQ2, introduced in 2013. It also uses 33 tones, in this case spaced 9Hz apart (actually 8.7890625 Hz, exactly 1.5 x the baud rate at the highest speed), resulting in a signal bandwidth of 300Hz, including the keying sidebands. The ITU Emission Designator is 300HF1B. The modulation is constant amplitude, phase coherent MFSK, using IFK+ coding with 32 frequency differences, yielding 32 unique codes. This means that each symbol carries enough information for all lower case letters to be expressed in just one symbol, which greatly enhances the speed.

Some key features of FSQ:

  • IFK+, providing drift-proof operation and good tolerance of multi-path interference.
  • Efficient Alphabet, where most letters and punctuations can be sent in just 1 symbol.
  • No synchronization required for decoding, allowing fast acquisition of signal
  • Arbitrary transmission speed, allowing transmission and reception of baudrates at any rate between 2-6 Bd, without requiring adjustment on the receiver's side.
  • Chat operation, behaves like a messaging app.
  • Supports selective calling functions,telemetry,image transfer, and file transfer functions.

Samples

Frequencies

Region 1

  • 80m 3588 kHz USB (sunset to sunrise)
  • 40m 7044 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 2

  • 80m 3594 kHz USB (sunset to sunrise)
  • 40m 7104 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 3

  • 80m 3580 kHz USB (sunset to sunrise)
  • 40m 7105 kHz USB (sunrise to sunset)
  • 30m 10149 kHz USB (local day, DX night)

Decoding Software

Hobby Level Software


FSQ
Frequencies3.58 MHz,7.104 MHz,10.149 MHz
Frequency Range3.58 MHz - 10.149 MHz
ModeUSB
ModulationIFK+
ACF
Emission Designator
Bandwidth300 Hz
LocationWorldwide
Short DescriptionFast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015.
I/Q Raw Recording
Audio Sample

Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. FSQ is used on HF on fixed frequency channels. VHF adaptions of FSQ are also supported using VHF FM. FSQ uses IFK+ and has efficient alphabet encoding as well as no need for syncing to receive. The FSQ modulation, coding and FSQCall protocol are publicly disclosed and described, and the software is open source.

FSQ is intended for fixed frequency (channelized) operation, with dedicated calling frequencies. It isn't intended as a 'tune around to see what you can find' mode!

Characteristics

FSQ is essentially a speeded-up version of the weak-signal mode WSQ2, introduced in 2013. It also uses 33 tones, in this case spaced 9Hz apart (actually 8.7890625 Hz, exactly 1.5 x the baud rate at the highest speed), resulting in a signal bandwidth of 300Hz, including the keying sidebands. The ITU Emission Designator is 300HF1B. The modulation is constant amplitude, phase coherent MFSK, using IFK+ coding with 32 frequency differences, yielding 32 unique codes. This means that each symbol carries enough information for all lower case letters to be expressed in just one symbol, which greatly enhances the speed.

Some key features of FSQ:

  • IFK+, providing drift-proof operation and good tolerance of multi-path interference.
  • Efficient Alphabet, where most letters and punctuations can be sent in just 1 symbol.
  • No synchronization required for decoding, allowing fast acquisition of signal
  • Arbitrary transmission speed, allowing transmission and reception of baudrates at any rate between 2-6 Bd, without requiring adjustment on the receiver's side.
  • Chat operation, behaves like a messaging app.
  • Supports selective calling functions,telemetry,image transfer, and file transfer functions.

Samples

Frequencies

Region 1

  • 80m 3588 kHz USB (sunset to sunrise)
  • 40m 7044 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 2

  • 80m 3594 kHz USB (sunset to sunrise)
  • 40m 7104 kHz USB (sunrise to sunset)
  • 30m 10144 kHz USB (local day, DX night)

Region 3

  • 80m 3580 kHz USB (sunset to sunrise)
  • 40m 7105 kHz USB (sunrise to sunset)
  • 30m 10149 kHz USB (local day, DX night)

Decoding Software

Hobby Level Software

Additional Images

  • FSQ using FSQCall reception and transmission

Additional Images

  • FSQ using FSQCall reception and transmission

  • FSQ using FSQCall reception and transmission

Additional Images

  • FSQ using FSQCall reception and transmission