Differences

This shows you the differences between two versions of the page.

--- packet:ninotnc [2025/02/17 16:13] – m0lte
+++ packet:ninotnc [2025/04/16 15:23] (current) – [Operating modes] g7taj
@@ Line 21: / Line 21: @@
 ===== UK Stock =====
-By agreement, Tom M0LTE holds stock of PCB + microcontroller only kits in the UK. These are available with circa 2 day shipping from [[https://ko-fi.com/s/981d919ea3|https://ko-fi.com/s/981d919ea3]]. Two sets of components from Mouser takes you over their free shipping threshold.
+By agreement, Tom M0LTE sometimes holds stock of PCB + microcontroller only kits in the UK. These are available from [[https://ko-fi.com/s/981d919ea3|https://ko-fi.com/s/981d919ea3]]. Two sets of components from Mouser takes you over their free shipping threshold.
 ===== Operating modes =====
@@ Line 27: / Line 27: @@
 Current modes as of firmware release 3.40 / 4.40 / v40 (all refer to the same version)
-^# ^ Mode ^ Baud  ^ bps   ^ Mod  ^ Proto ^ Usage  ^ BW     ^ Typical use                                                                                ^
+^# ^ Mode ^QtSM Mode ^ Baud  ^ bps   ^ Mod  ^ Proto ^ Usage  ^ BW     ^ Typical use                                                                                ^
-|1 | 0001 | 19200 | 19200 | 4FSK | IL2Pc | FM     | 25k    | High SNR links between dedicated data radios. v41 firmware required in practice.           |
+|1 | 0001 | ? |19200 | 19200 | 4FSK | IL2Pc | FM     | 25k    | High SNR links between dedicated data radios. v41 firmware required in practice.           |
-|3 | 0011 | 9600  | 9600  | 4FSK | IL2Pc | FM     | 12.5k  | High SNR links between dedicated data radios. Suitable for UK 2m band.                     |
+|3 | 0011 | ? | 9600  | 9600  | 4FSK | IL2Pc | FM     | 12.5k  | High SNR links between dedicated data radios. Suitable for UK 2m band.                     |
-|2 | 0010 | 9600  | 9600  | GFSK | IL2Pc | FM     | 25k    | Current recommended mode for new 70cm (25kHz) links where both ends are compatible         |
+|2 | 0010 | ? | 9600  | 9600  | GFSK | IL2Pc | FM     | 25k    | Current recommended mode for new 70cm (25kHz) links where both ends are compatible         |
-|5 | 0101 | 3600  | 3600  | QPSK | IL2Pc | FM     | 12.5k  | For situations where only a speaker/mic connection is available but > 1200 baud is desired |
+|5 | 0101 | ? | 3600  | 3600  | QPSK | IL2Pc | FM     | 12.5k  | For situations where only a speaker/mic connection is available but > 1200 baud is desired |
-|11| 1011 | 1200  | 2400  | QPSK | IL2Pc | SSB/FM | 2.4kHz | HF - quadrature version of 1200 BPSK, twice the throughput for +3dB SNR.                   |
+|11| 1011 | QPSK v26a | 1200  | 2400  | QPSK | IL2Pc | SSB/FM | 2.4kHz | HF - quadrature version of 1200 BPSK, twice the throughput for +3dB SNR.                   |
-|10| 1010 | 1200  | 1200  | BPSK | IL2Pc | SSB/FM | 2.4kHz | HF - use for circuits where wider transmission is acceptable.                              |
+|10| 1010 | ? | 1200  | 1200  | BPSK | IL2Pc | SSB/FM | 2.4kHz | HF - use for circuits where wider transmission is acceptable.                              |
-|9 | 1001 | 300   | 600   | QPSK | IL2Pc | SSB    | 500Hz  | HF - quadrature version of 300 BPSK, twice the throughput for +3dB SNR                     |
+|9 | 1001 | ? | 300   | 600   | QPSK | IL2Pc | SSB    | 500Hz  | HF - quadrature version of 300 BPSK, twice the throughput for +3dB SNR                     |
-|8 | 1000 | 300   | 300   | BPSK | IL2Pc | SSB    | 500Hz  | HF - slowest but best performing mode. ~7dB better than classic 300 baud FSK AX.25         |
+|8 | 1000 | BPSK AX.25 300bd | 300   | 300   | BPSK | IL2Pc | SSB    | 500Hz  | HF - slowest but best performing mode. ~7dB better than classic 300 baud FSK AX.25         |
-|14| 1110 | 300   | 300   | AFSK | IL2Pc | SSB    | 500Hz  | CRC improvement of IL2P 300 baud AX.25. Recommended if you can't do BPSK / QPSK on HF.     |
+|14| 1110 | AFSK AX.25 300bd | 300   | 300   | AFSK | IL2Pc | SSB    | 500Hz  | CRC improvement of IL2P 300 baud AX.25. Recommended if you can't do BPSK / QPSK on HF.     |
-|- | 1111 | n/a   | n/a   | n/a  | n/a   | n/a    | n/a    | Allows the mode to be set by a SETHW KISS command (v41+).                                  |
+|- | 1111 | ? | n/a   | n/a   | n/a  | n/a   | n/a    | n/a    | Allows the mode to be set by a SETHW KISS command (v41+).                                  |
 IL2Pc is shorthand for IL2P plus CRC.
+**QtSM NOTE: For IL2P and CRC modes, these need to be enabled per modem in the Settings/Modems menu**
 Superseded (but still supported) modes:
@@ Line 273: / Line 276: @@
 , 0111: 1248 Hz tone for 3.0kHz deviation \\
 :       2079 Hz tone for 5.0kHz deviation \\
+C4FSK 9600 - 1039Hz for 2.5kHz outer deviation \\
+C4FSK 19200 - 2079Hz for 5.0kHz outer deviation \\
+==== Frequency misalignment ====
+TL;DR: +/- 4kHz is absolute maximum misalignment for narrow channel, that will still be decoded
+Tested using a 25kHz Tait TM8105, programmed with a 12.5kHz channel, using a 4k8 GFSK signal with 1.2kHz deviation, and tested with a signal generator. The receive performance was fairly consistent with frequency misalignment up to +-4kHz. At that limit, the Tait's RSSI pin was indicating 3dB less signal strength than when the frequency was perfectly aligned. At +- 5kHz misalignment, receive performance disappeared. All packets lost.
+Narrowband Kenwood TK-760, nearly the same as the Tait. Also tried a FTM-3100 set to narrow. Similar, but less accurate and wider. It worked +4kHz to -6kHz, suggesting a couple kHz oscillator misalignment.
 ===== Misc Linux Notes =====
@@ Line 396: / Line 409: @@
 ===== Firmware =====
+To check your firmware version, press the test (red) button on TNC and observe the decoded packet.
+<code>
+=FirmwareVr:3.41=SerialNmbr:=UptimeMilS:0196CC43=BrdSwchMod:040F0002=AX25RxPkts:000008E5=IL2PRxPkts:
+00000000=IL2PRxUnCr:00000000=TxPktCount:000008F6=PreamblCnt:0000000B=LoopCycles:0C0281E9=LostADCSmp:00000000
+</code>
 To upgrade the firmware, see https://github.com/ninocarrillo/flashtnc/blob/master/README.md.