(04-10-2025, 01:22 AM)XPS Wrote: You are not understanding what you are measuring. If you place your transmitter 10 feet away from your analyzer you are going to see a much different result. That device is measuring the signal strength as it sees it. The only way to measure output power is by a direct connection.
Anytime you see a negative (-) value that means receiving signal strength.
You can find various calculators online that will show you some simple things, like for output power 100mw = 20.0dBm, and 200mw = 23.01dBm. Again, this is output power. Remember it takes basically 4x the output power (400mw vs. 100mw) to double the effective range. Every 6dB doubles the range - either via transmitter output power (26dBm = 400mw) or by having a 6dB increase in receiver sensitivity.
i think i know quite well what i am measuring. i compare 2 transmitters and i know one has 200mW output and gives me a certain signal at a given distance in my SA then i take the other one at same distance and same antenna orientation and it gives me another value, like 8dBm less. and per online dBm calculator this is a factor of 6.3x.
so yes 10^2 (20dBm) = 100mW (with 0 dBm=1mW)
10^0.8 (8dNm) = 6.3 mW
no matter what an 8dB difference is a factor of 6.3.
anyway i will measure with a direct connection
that is what i have so far
https://1drv.ms/w/c/9dc6d60a8cb4c333/EYo...Q?e=M5KjRN
and based on this the XPS output is much lower than for example the DSM2 module.
i ordered a connector to make a direct connection to the spectrum DX6i RF module