Microhard n920- 900 MHz Spread Spectrum Wireless Modem with Pixhawk Cube

Hardware Pixhawk family
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1

I’m trying to use Microhard n920- 900 MHz Spread Spectrum Wireless Modem with Pixhawk Cube. It shows TTL interface in its technical specification but use rs232 cable. I made custom cable for telemetry 1 but it didn’t work. Need your suggestion?Following are technical specification of modem.

Frequency 902-928 MHz
Spreading Method Frequency Hopping / DTS
Band Segments Selectable via Freq Restriction
Forward Error Detection Hamming
BCH
Golay
Reed-Solomon
Error Detection 32 bits of CRC, ARQ
Encryption Optional (see –AES option)
Range 60+ miles (100+ km)
Sensitivity n920T
n920F
-100 dBm @ 10-4
-108 dBm @ 10-6
Output Power 100mW - 1W (20-30dBm)
Serial Interface :TTL
Serial Baud Rate - Up to 230.4 kbps asynchronous

  • Up to 3.2 Mbps synchronous
    Link Rate Up to 1.3824 Mbps
    (higher rates available, contact Microhard for
    details)
    Operating Modes Point-to-Point, Point-to-Multipoint, Store &
    Forward Repeater, Peer-to-Peer
    Signals Interface RxD1, TxD1, RTS, CTS DCD, DSR, DTR,
    RxD2, TxD2, RSSI LEDs, Tx/Rx LEDs, Reset,
    Config, Wake-up, RSmode
2

did you get it to work?

3

I doubt it.
In RS232 terms TTL means a voltage swing of 5volts, where the flight controllers only have a swing of 3.3volts. So it’s most likely the the radio would not register the 1’s and 0’s reliably.
And it’s only serial, no Mavlink framing.