packet:ninotnc
Differences
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| packet:ninotnc [2026/02/08 14:36] – [Firmware] m0lte | packet:ninotnc [2026/08/07 20:58] (current) – Mort upgrade: tighten emphasis markers so they parse again 0.0.0.0 | ||
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| Baud is symbols per second, bps is bits per second. Where baud=bps, that means each symbol carries 1 bit (i.e. a symbol can have two states, 0 or 1). Where baud is 2x bps, that means each symbol carries 2 bits (i.e. a symbol can have four states: 00, 01, 10, 11). | Baud is symbols per second, bps is bits per second. Where baud=bps, that means each symbol carries 1 bit (i.e. a symbol can have two states, 0 or 1). Where baud is 2x bps, that means each symbol carries 2 bits (i.e. a symbol can have four states: 00, 01, 10, 11). | ||
| - | ** Decoding Operating Modes from BrdSwchMod ** | + | **Decoding Operating Modes from BrdSwchMod** |
| When the test button is pressed on the TNC, along with the frame it emits to the radio, it will emit a different frame to the KISS client that is connected. | When the test button is pressed on the TNC, along with the frame it emits to the radio, it will emit a different frame to the KISS client that is connected. | ||
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| * AX.25 - Basic over-the-air protocol utilised for packet radio | * AX.25 - Basic over-the-air protocol utilised for packet radio | ||
| * IL2P - Improved Layer 2 Protocol - effectively implements AX.25 but with some over-the-air improvements, | * IL2P - Improved Layer 2 Protocol - effectively implements AX.25 but with some over-the-air improvements, | ||
| - | * IL2P+CRC - IL2P with added checksum. Co-developed by Nino KK4HEJ and Jonathan G4KLX to resolve corruption found with IL2P in practice. | + | * IL2P+CRC |
| * BW - in this context, for FM: channel spacing, and for SSB: audio bandwidth. | * BW - in this context, for FM: channel spacing, and for SSB: audio bandwidth. | ||
| * Baud - symbols per second | * Baud - symbols per second | ||
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| It's also useful to measure the peak-to-peak voltage of the transmit audio signal fed to the radio after proper deviation is set, using an oscilloscope. In this case it was 690mV. This will serve as a "good enough" | It's also useful to measure the peak-to-peak voltage of the transmit audio signal fed to the radio after proper deviation is set, using an oscilloscope. In this case it was 690mV. This will serve as a "good enough" | ||
| + | ==== Deviation / test-tone reference ==== | ||
| - | The FM modes tones are as follows: | + | Press the TEST button to emit the tone shown, then tune TX deviation to the target. |
| + | Deviation tuning applies to the FM modes only; SSB rows list the audio/ | ||
| + | Values current for firmware v3/4.44. | ||
| - | 0000, 0001: 999 Hz tone for 2.4kHz deviation \\ | + | ^ Switch ^ Band ^ Modulator ^ Test Tone / Centre Freq (Hz) ^ Target Deviation (kHz) ^ |
| - | 0010, 0011: 500 Hz tone for 1.2kHz deviation \\ | + | | 0000 | FM | GFSK 9600 | 999 | 2.4 | |
| - | 0110, 0111: 1248 Hz tone for 3.0kHz deviation \\ | + | | 0001 | FM | C4FSK 19200 | 2079 | 5.0 | |
| - | 0101: 2079 Hz tone for 5.0kHz deviation \\ | + | | 0010 | FM | GFSK 9600 | 999 | 2.4 | |
| - | C4FSK 9600 - 1039Hz for 2.5kHz outer deviation \\ | + | | 0011 | FM | C4FSK 9600 | 1039 | 2.5 | |
| - | C4FSK 19200 - 2079Hz for 5.0kHz outer deviation \\ | + | | 0100 | FM | GFSK 4800 | 500 | 1.2 | |
| + | | 0101 | FM | QPSK 3600 | 2079 | 5.0 | | ||
| + | | 0110 | FM | AFSK 1200 | 1248 | 3.0 | | ||
| + | | 0111 | FM | AFSK 1200 | 1248 | 3.0 | | ||
| + | | 1000 | SSB | PSK 300 | 1500 | n/a (SSB) | | ||
| + | | 1001 | SSB | PSK 300 | 1500 | n/a (SSB) | | ||
| + | | 1010 | SSB | PSK 1200 | 1500 | n/a (SSB) | | ||
| + | | 1011 | SSB | PSK 1200 | 1500 | n/a (SSB) | | ||
| + | | 1100 | SSB | AFSK 300 | 1700 | n/a (SSB) | | ||
| + | | 1101 | SSB | AFSK 300 | 1700 | n/a (SSB) | | ||
| + | | 1110 | SSB | AFSK 300 | 1700 | n/a (SSB) | | ||
| + | | 1111 | — | SET FROM KISS | n/a | n/a | | ||
| ==== Frequency misalignment ==== | ==== Frequency misalignment ==== | ||
packet/ninotnc.1770561393.txt.gz · Last modified: by m0lte