How do you folks calibrate your dongle? I see instructions to setup on noaa chl and move the freq. ppm from 0-?? depending on your dongle. What I want to know is how do I get it to match freqs. with a real scanner. I set the (pro-2026) scanner to 154.7550 and when I see it in sdr# and try to match it...the sdr# freqs. is 153.7020. Is this where the shift might come into play? Hoping someone can help with this. Thanks.