Testing a board with HPD14A V1.2 lora module (SX1278 433 - 470 MHz) I notice offset between set frequency and transmitted frequency for both RTTY and V2 4fsk and not for LoRa and APRS LoRa

For LoRa my receivers report average - 0.6 kHz offset.
For APRS LoRa my receiver reports -0.1 kHz offsett.

TX frequencies for RTTY and 4FSK are 6 kHz below the frequency set in the config. By adding 6 kHz to them I can get them on the wanted frequency. Difficult to test if this offset changes with frequency.

Any idea why lora TX is on frequency but RTTY and 4fsk are not ? Not sure if any other users experience the same.

Thanks,
Ben

Hi, this morning I grabbed "some hardware" from my drawer to give this a test :-)

With a bit of Google I got passed the "init failure" by setting the lora config to:

************************************************************************************/
#define SCK 5
#define MISO 19
#define MOSI 27
#define CS 34

#define PIN_NSS 18
#define PIN_DIO0 26
#define PIN_BUSY -1 // Not used in this sketch for sx1278
#define PIN_RESET 23
#define PIN_DIO1 -1 // Not used in this sketch for sx1278

---

It's transmitting now, as set, RTTY, 4FSK V2, LoRa APRS and LoRa , and I am awaiting the inside GPS lock to see if I have the right configuration set for that too.

Working GPS pins for this model:

// GPS Serial device
static const int Rx = 12, Tx = 34; // This will probably be different for your board
static const uint32_t GPSBaud = 9600;

some info used:

Thanks !

Ben