Sharing some results I obtained using a GPS-disciplined oscillator (GPSDO; 1 ppb accuracy) to measure the output frequency accuracy for the TinySA. I used the heterodyne method: i.e. set the GPSDO to exactly 1000 Hz
lower frequency than the (unmodulated) TinySA output, then use an AM mode receiver/software to measure the frequency of the audio tone produced, and compare it to the theoretical 1000 Hz value.
As one would expect, the ppm error was consistent, I assume based on the master oscillator that drives everything.? For such an inexpensive device this level of accuracy simply amazes me.
TinySA Frequency Output Measurements
|
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? |
| S/N SA-2009074 |
? |
? |
| ? |
? |
? |
| Frequency (MHz) |
Error (Hz) |
Error (ppm) |
| 50 |
-17.5 |
-0.35 |
| 150 |
-53 |
-0.35 |
| 200 |
-70.8 |
-0.35 |
| 400 |
-139.8 |
-0.35 |
| 600 |
-208.9 |
-0.35 |
| 800 |
-278 |
-0.35 |
