qczek lrs vs rf generator скачать в хорошем качестве

qczek lrs vs rf generator

Simple test, to check LoRa modulation immunity... Please note that i used not professional and not scalled equipment Lora TX is QCZEK LRS, set to low power with -26dB attenuator installed so it outputs about -2dBm of RF power. It's placed on another floor of the building...It use freq hopping, and we will try to block only single frequency... RX has connected red LED which blinks every time when package is lost, there are about 20 packages send every second... the interfere signal is generated in the middle of band used by LoRa module telemetry is off, so RX does not produce any RF noise we can see, that LoRa signal is below -40dBm (received by SDR dongle) when RF generator's power is set to 2dB it's signal is received by SDR as at least -10dB, so it's at least 30dB stronger then LoRa signal.... stronger RF signal introduces problems trying to "jam" LoRa signal by generating different freq in it's band with the same power, does not stop transmission... I used 500kHz band, spreading factor set to 7, codding rate 4/8.