James Limbouris

I agree - changing the offset delay should change the phase of all measurements, but shouldn't change the amplitude. The return loss graph should be completely unaffected by the offset...

Seems like it doesn't change the amplitude if there is no calibration set, so its some kind of interaction between the calibration and the offset delay.

Looks like the code applies the cable correction first, before applying the calibration. Shouldn't it apply the calibration first, to nail down exactly what was seen at the calibration plane....

Added PR #419

Try turning off your pluto's xo_correction (fw_setenv xo_correction 40000000 on console), and use a baseband data rate of 4 MHz. Set the attenuation to 80 dB, and put the receiver...

Try this .grc file in gnuradio companion. You need to disable xo_correction on your Pluto, then tweak the value in the ppmOutTarget variable of the grc file. [gps-sdr-sim.zip](https://github.com/osqzss/gps-sdr-sim/files/6105847/gps-sdr-sim.zip)

I suggest you install gnuradio. Disabling xo_correction will probably be enough though, so long as your GPS receiver can tune in the remaining ppm on its own.

The issue is, if you use the xo_correction the relationship between the RF center frequency and the baseband sample rate gets recalculated and quantized according to a complex algorithm in...

The .grc file I posted is configured for a 4 MHz sample rate, and the xo_correction set to 40000000. That's all the help I can offer - I'm unsubscribing from...

When the signals appear and disappear, it usually means there is a frequency offset. Your SDR's local oscillator has a discrete step size (ie. ~2.38419 Hz on the Pluto), and...