04-12-2025, 09:00 AM
(04-12-2025, 01:33 AM)XPS Wrote: We saw the document. Comparing solely output power is only part of the equation when determining the overall range of an RF system.
You need to do some research about how power equates to distance. As stated, every 6dB of power doubles the effective range. If you have transmitter that has 100mW output (20dBm), to double the range that transmitter would need to output 400mW (26dBm). The same holds true for receiver sensitivity, with every 6dB of sensitivity increase also doubling the effective range.
High output power burns battery power and can actually damage your body if too high. It's also more prone to reflectivity off nearby object which can cause multi-pathing issues.
The DivBee™ RF module that we created is the longest range 2.4GHz device in existence. From RFU to RFU we get up to 7 miles of range with this device, due to the dual diversity antennas with very high signal gain.
look i have no doubt that your XPW system was good and i used it for over 10 years and was very happy and also said that you disappeared. just my latest mishap with the nano made me look into that output power , also because i had this tinySA sitting int he drawer. so none of the transmitters per my tinySA transmits the power as expected. i added the dx6i direct measurement to the doc and also this is only at 100 mW (vs expected 200mW). so it could well be my measurement. i have ordered a RF power adapter based on the https://www.amazon.com/dp/B07RR86PFC?ref...asin_title
which may work better or not - just curious.
sure the actual range is a different story but this should not prevent me from being able to actually measure the output power correctly.
oh, i also seem to remember that the elevation of transmitter and receiver has a big impact too ( fresnel zone) on the range so from that side airplane in the sky should be much better than near ground