packet:ninotnc
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| packet:ninotnc [2026/07/11 10:43] – [Random excerpt from conversations on the subject] 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 === | + | ==== Deviation / test-tone reference |
| Press the TEST button to emit the tone shown, then tune TX deviation to the target. | Press the TEST button to emit the tone shown, then tune TX deviation to the target. | ||
packet/ninotnc.1783766637.txt.gz · Last modified: by m0lte