A36Plus
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Talkpod A36Plus is a dual-band VHF/UHF amateur radio transceiver. A hardware modification allows to access flat baseband (frequency modulator and demodulator) signals over its Kenwood connector. This enables M17 support with the use of an external modem, such as the Module17.
Modification guide
The guide is here.
Register edits required
| Register | Value | Comments |
|---|---|---|
| 0x47 | (9 << 8) | 3 | Change AF type to 9 (BYPass), do some undocumented thing "for gain", and bypass the AF TX filter. |
| 0x48 | bits 9:4 set to 0x3F | Increase AF RX Gain a little (~1.5dB). |
| 0x40 | bits 11:0 to 0x4DF | Increase TX deviation. |
| 0x7E | bits 5:0 set to 0b000000 | Bypass DC filters on TX and RX (Mic In and IF In). |
| 0x19 | bit 15 set to 1 | Disable Mic AGC/Automatic Mic PGA Controller. |
| 0x7D | bits 3:0 | Adjust Mic Gain to get the desired deviation. 0x0 minimum, 0xF maximum, 0.5dB/step. |
| 0x2B | 10:8 set to 0b111, 2:0 set to 0b111 | Disables HPF300, LPF3K and de/pre-emphasis filters on RX/TX respectively. |
The list above may not be complete. Check Mobilinkd's page for hints.
Flashing OpenRTX
Use the official flashing tool from Talkpod. The binary is available in the modification guide repository linked above.