Erhard,
When you get that XDP device, you can also use it to run the XPS "RSSI" application that comes with the suite of XDP programs. The RSSI application displays in real time the signal strength received by the XDP device. I performed the following experiment to compare the output of one my transmitters when I had a concern about its output.
Connect the XDP device to a PC and activate the XPS “RSSI” application.
Then put the transmitter module into binding mode. Then click the button on the RSSI application and follow the instructions provided by the application. After it connects to the transmitter, the RSSI application displays the number of channels, the frame rate, the channel hopping mode and the RSSI as received from the transmitter.
Be careful to keep the transmitters and their antennas and the XDP device in the same locations during the testing.
Measured on the bench, my Futaba 9C, Taranis and Jumper T12 transmitters and their respective XPS Futaba and XPS JR-type modules all delivered -36dB to the RSSI application as the strongest signal. When I moved the transmitters to the next room behind one wall and the refrigerator, the RSSI decreased to -57dB for all three. When I put them inside the refrigerator (a steel box), the RSSI decreased to -77dB for all three.
Since all three transmitters gave similar results, I reckoned that all three transmitter modules were transmitting as designed. If you see a significant difference with your equipment, then you may have found something.
Out of curiosity I pressed the low-power button (range test) on the transmitter modules and observed that the signal strength went down by about 25 dB.
Paul
When you get that XDP device, you can also use it to run the XPS "RSSI" application that comes with the suite of XDP programs. The RSSI application displays in real time the signal strength received by the XDP device. I performed the following experiment to compare the output of one my transmitters when I had a concern about its output.
Connect the XDP device to a PC and activate the XPS “RSSI” application.
Then put the transmitter module into binding mode. Then click the button on the RSSI application and follow the instructions provided by the application. After it connects to the transmitter, the RSSI application displays the number of channels, the frame rate, the channel hopping mode and the RSSI as received from the transmitter.
Be careful to keep the transmitters and their antennas and the XDP device in the same locations during the testing.
Measured on the bench, my Futaba 9C, Taranis and Jumper T12 transmitters and their respective XPS Futaba and XPS JR-type modules all delivered -36dB to the RSSI application as the strongest signal. When I moved the transmitters to the next room behind one wall and the refrigerator, the RSSI decreased to -57dB for all three. When I put them inside the refrigerator (a steel box), the RSSI decreased to -77dB for all three.
Since all three transmitters gave similar results, I reckoned that all three transmitter modules were transmitting as designed. If you see a significant difference with your equipment, then you may have found something.
Out of curiosity I pressed the low-power button (range test) on the transmitter modules and observed that the signal strength went down by about 25 dB.
Paul