Problems calibrating SDR#

[watchman9525]

I've recently purchased a RTL2832U dongle and have SDR# successfully installed.

I can listen to signals, but it appears there is a 12.5kHz difference that needs to be calibrated for. For example, I have to tune to 407.262.500 when the actual frequency is 407.275.000.

The problem is, when I adjust the frequency correction field in SDR#, the actual signal does not move across the screen far enough in order to line up to the tuned frequency. Even when I enter the maximum value of 1000ppm, there is still a big gap between the tuned and actual frequency.

I have NFM selected, with a bandwidth of 12000, and order is 500.

What am I doing wrong? I feel like maybe I have missed a step, or do I have a faulty dongle?

 

[BM82557]

Do you have Swap I & Q checked? If so un-check it.

 

[watchman9525]

Correct IQ is ticked, but swap I & Q is not...

 

[moonbounce]

Also uncheck the shift box.

 

[watchman9525]

Hi all, I seem to have got to the bottom of my problem. It seems that the beacon I was using to try and calibrate to was actually on a different frequency to what I thought, so I was trying to calibrate to the wrong frequency in other words.
I have found that a setting of around 30ppm is appropriate for my dongle. Thanks for all the input.