Thank you so much!! I was able to get real close to your transmit output power chart. but I am baffled by an increasing delta in the power received as frequency decreases between your chart and mine. I put your output power series in excel for tx port 1 and compared it to mine and the results are below:
My setup is the limeSDR with your ini file, I did some minor tweaks to increase the power recieved by a few db in my anritsu spectrum analyzer. The tewaks were minor in that I was only able to get about 2 dB gain over your ini file and hence I got slightly closer to your power received. I changed things like the Bias at gate of mixer values to 31 in TRF tab in limeSuite.
I have an lmr400 cable 25 ft length connected from limesdr to anritsu analyzer so about a 1 dB cable loss. There is a ruggedized adapter at the input port of the anlyzer with about .1 dB loss, there is also a converter sma to n connector from limesdr to lmr cable, then I gave myself an extra dB for system loss so 3 in all. the Lmr cable is connected directly to the input port of the anritsu analyzer. I had to do this cause before I was transmitting with a telescopic antenna which had some gain and setting it close to the input port of the anritsu analyzer I was getting some distortion due to a magnet at the bottom of the antennas plus free space loss and other not factored-in variables I just didn’t trust the - 7 dBm max power I was getting.
With the control setup above transmitting via the lmr cable I finally got close results to yours. However, as you can see in the lower frequencies I have a delta with what you get. at 500 MHz our difference is 12 dB, at 1000 MHz it drops to 5 dB, at 2.5 GHz it drops to 3 and finally we are exactly the same from 3.5 GHz and up.
From these readings, I am led to believe that the specsheet max output value of +10dBm is correct if my setup is correct as I maxed out at +10 dBm at 1 GHz. But you were able to record power received values of up to 15 dBm. Is it possible with the max being 10 dBm? I am wondering if in your setup you had an antenna gain or amplifier gain that was causing the higher gain at the lower frequencies? and perhaps it was out of operation range after 3 Ghz and hence we math after that frequency? Or most likely perhaps I am still doing something wrong and not capturing the max power.
Now, I am using the LimeSDR 1.4 version motherboard.
Any feedback you may have is greatly appreciated,