This video shows how to use the pulse output of a NEO-7M to correct a small frequency error of the TCXO of the tinySA. No additional equipment is needed.
The correction factor is using the following formula:
Fc = 10MHz * Ft/Fa
Where:
Fc = the actual 10MHz frequency of the tinySA TCXO to be entered in the expert menu. The number used in the video is 9999980Hz
Ft = the target frequency of the harmonic used. In the video 500MHz
Fa = the tinySA measurement of the harmonic frequency. In the video 500.001MHz
More info on tinySA: https://www.tinysa.org/wiki/
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tinySA using NEO-7M output for frequency correction | NatokHD