rdforrest / fsk-tx-rx-test-458mhz

FSK-TX-RX-Test-458MHz

Very simple and basic software to enable testing of FSK modulation system for model submarine use at 458 MHz using the RFM69HCW chip. (Model Control Band in UK 458.5 - 459.5 MHz) This system has been tested and gives a range of about 30m at a depth of 0.5m. Test details: https://www.theassociationofmodelsubmariners.com/t83p225-openlrs-on-458mhz-and-433mhz-and-submarines#11599Only 6 channels and 4 times a second refresh rate used to provide a minimalistic control system for test purposes only. Has a failsafe which is activated after 10 seconds of no signal. The failsafe values included in the receiver software are those for my model sub setup but can be changed in the software. Uses standard defaults for RadioLib but with Frequency set to 458.75 and Bandwidth set to 62.5kHz for the UK (Thanks to Simon H for the suggestion. Edit by RDF in the RF69.h file in Arduino/libraries/RadioLib/src/modules/RF 69/RF69.h.) Thanks to Jonathan Askey for suggesting and providing the accurate ppm reader. (The simpler ppm routine by David Vella gives an interrupt clash.) The later RX 2.1 and TX 2.6 sketches work for radio control but the Telemetry function is not working. Any help would be appreciated. (Thanks to Simon H for the help.) Hardware: Nanos for TX and RX at 5v.

Standard Defaults: RF69/SX1231 Begin method: Carrier frequency: 434.0 MHz Bit rate: 48.0 kbps Frequency deviation: 50.0 kHz (single-sideband) Receiver bandwidth: 125.0 kHz Output power: 10 dBm Preamble length: 16 bits Other: Packet length mode: variable, maximum of RF69_MAX_PACKET_LENGTH bytes (length byte included in packet) Sync word: 0x12 0xAD Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied) Encoding: NRZ (non-return to zero - no encoding) CRC: enabled Address filtering: disabled AES encryption: disabled Inaccessible: Over-current protection: enabled Automatically clear packet on CRC mismatch: enabled

DEVELOPMENT STOPPED - LoRa looks like a a better system for underwater range