Since we rely on our quoted VCO deviation figures of xx kHz/V for the gyro signal calibration, I thought it was a good idea to measure them. I used a calibrator to apply a known voltage to the external modulation input of the VCO and then tracked the peak on the RF analyzer. Attached are the following measurements
- Tektronix with fc = 47.5 MHz and a nominal deviation of 100 kHz/V
- Marconi with the same as above
- Marconi with fc = 95 MHz and a nominal deviation of 375 kHz/V
The first two are in the configuration we use for the driving of the AOM, while the third is what we use for the PLL. I didn't bother doing the Tektronix in the PLL configuration because we will never use it for this. Somewhat surprisingly, the Tektronix is true to its stated value, while the Marconi is a bit under what it quotes. Luckily, they are both linear.