This document describes the first steps to set-up Spectrum Lab to receive the 82 Hz signal from the Kola Peninsular Transmit Facility.

(KPTF part 1.html)

I wish to acknowledge the assistance provided by Markus Vester DF6NM to set-up the system at QE37pd.

Equipment used at QE37pd.

A Steinberg UR22 MKII audio interface, the signal from the antenna is connected to channel 2.

(That enables to HI-Z setting to be used).



A Garmin 18 LX GPS unit with PPS signal connected to channel 1.



Spectrum Lab Set-up.

To test this set-up, a signal from a receiver tuned to an NDB carrier was used.
Actually 302 kHz WYY Wynyard Tasmania (234 km) the receiver tuned to 301.918 kHz i.e. 82 hertz offset.



The signal on Input Channel 2 from R2 is set-up for the top waterfall section.
The test signal generator signal from L5 is set-up for the bottom waterfall section.
Components Help file


(Note: Both filters are set to "NO bypass".
Later the Black Box between R1 and R2 will be set-up with a band pass filter and noise blanker,
and the PPS signal will be used for sample rate correction).

The Signal Generator is set-up to 82 Hz sine wave at -80 dB.
Test Signal Generator Help.



Now change the FFT setup from "Normal (amplitude only) to "Radio Direction Finder" on the FFT Tab FFT Output section.
FFT help settings



RDF help



The Main Window will now be in RDF mode with a similar display.
The 82 Hz signal will have rotating RGB colours as its phase relative to the Test Signal varies.



Now open the Spectrum Lab Command Window and enter this code and run it using the Run menu item.
Command Window help



The code displays the current signal frequency between 81 Hz and 83 Hz and then sets the Test Signal Generator to that frequency.



Note the Test Tone Generator does not show all the decimal places.



The waterfall should now show the phase variation relative to the test signal.



Still to be configured

Band pass filter and Noise blanker.
Set-up of Watch window.
Set-up Sample Rate Correction.

EJT 25-9-2020
E&OE.