OSCAR 100 – GPSDO 10MHz filter

Here it is the output of ProgRock without any filtering:

Fig. 1 – Output of the ProgRock 10MHz unfiltered

I decided to try a 30m LPF from QRP-Labs, this is the output:

Fig. 2 – ProgRock Output with 10MHz LPF

Probably due to the long cable, there were some reflections. Anyway much better.

This is the response of the filter from 10 to 50MHz, third armonic down 60dB:

Fig. 3 – LPF Filter response up to 50MHz