Q15X25
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|---|---|
| Frequencies | 3.585 MHz,7.035 MHz,14.109 MHz |
| Frequency Range | 3.585 MHz - 14.109 MHz |
| Mode | USB |
| Modulation | PSK,OFDM |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 1.95 kHz,2.35 kHz |
| Location | Worldwide |
| Short Description | Q15X25, also known as NEWQPSK, is an experimental amateur radio packet modem developed by Pawel Jalocha SP9VRC. Q15X25 is a OFDM QPSK implementation of the AX.25 Packet protocol used in PACKET. |
| I/Q Raw Recording | — |
| Audio Sample | |
Q15X25, also known as NEWQPSK, is an experimental amateur radio packet modem developed by Pawel Jalocha SP9VRC. Q15X25 is an OFDMOrthogonal Frequency-Division Multiplexing QPSKQuadrature Phase-Shift Keying (2 bits per symbol) implementation of the AX.25 Packet protocol used in PACKET. Q15X25 uses ARQAutomatic Repeat reQuestAutomatic Repeat Query and FECForward Error Correction and performs just like a packet radio terminal.
Characteristics[edit]
Q15X25 uses 15 QPSKQuadrature Phase-Shift Keying (2 bits per symbol) subcarriers to transmit AX.25 data packets at between 1000 bpsBits per second (bps) to 5000 bpsBits per second (bps). The original mode is set for 2500 bpsBits per second (bps) with an additional mode for 3000 bpsBits per second (bps).
| Original 8000 Sample Rate Mode | Modified 9600 Sample Rate Mode |
|---|---|
| Data Rate: 2500 bpsBits per second (bps) | Data Rate: 3000 bpsBits per second (bps) |
| Carrier Spacing: 125 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). | Carrier Spacing: 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). |
| 83.33 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. | 100 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. |
| ~1950 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Bandwidth | ~2350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Bandwidth |
Q15X25 is adjusted by five configuration parameters: bpsBits per second (bps), interleaving depth, FECForward Error Correction level, tune length, and sync length.
4 FECForward Error Correction modes are supported with Q15X25:
Original 2500 bpsBits per second (bps) | Modified 3000 bpsBits per second (bps)
- no FECForward Error Correction: 2500 bpsBits per second (bps) | 3000 bpsBits per second (bps) User Data Rate
- Simple (11/15) FECForward Error Correction: 1833.3 bpsBits per second (bps) | 2200 bpsBits per second (bps) User Data Rate
- BCH (7/15) FECForward Error Correction: 1166.7 bpsBits per second (bps) | 1400 bpsBits per second (bps) User Data Rate
- Walsh (5/15) FECForward Error Correction: 833.3 bpsBits per second (bps) | 1000 bpsBits per second (bps) User Data Rate
Samples[edit]
| 2500 bpsBits per second (bps) | 3000 bpsBits per second (bps) |
|---|---|
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Frequencies[edit]
- 80m: 3585 kHzKiloHertz (kHz) 10^3 Hz
- 40m: 7035 kHzKiloHertz (kHz) 10^3 Hz
- 20m: 14109 kHzKiloHertz (kHz) 10^3 Hz
Decoding Software[edit]
- Hobby Level Software
- MixW (Requires addon DLL for Q15X25)
- NewQPSK Linux only
- Soundmodem or Soundmodem fork (Linux only)
Video Examples[edit]
Additional Links[edit]
Additional Images[edit]
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