Frequency :
I read 5800.00 on my RX (no more figures here, I read at the next 10 Hz)
Usually, this is 0.01 low or so, even less than that.
Every time I can check with the Twente SDR, I am as close as I can read.
If you want the better readings, look at the Twente SDR in SAM mode.
Just sometimes, the Twente SDR can't hear weak stations.