With the Model 485X and 443X modulators, can I tune the modulators resonant frequency?
Although these modulators are shipped with a specific resonant frequency they can be tuned over a range greater than 100 MHz. The tuning element is simply a brass slug that screws into the resonant cavity and causes the resonant frequency to shift. The modulator’s resonant frequency will drift over long time periods and as the modulator’s temperature changes. So, we recommend optimizing the frequency match between your RF driver and the modulator each time you use the modulator. This can be done by tuning the frequency of your RF oscillator and looking for the maximum modulation effect from the modulator. Or, you can hold the RF oscillator frequency constant and turn the tuning element until the modulation is maximized.
