Modulation through IF port on CDM324

Since the frequency difference of a couple of my modules falls within my SA/TV-test-set receive range, I could try WBFM modulation. I used the same modulator of my HB100 10 GHz transmitter, without decoupling-smoothing capacitor across +5V/GND. The audio was signal fed through the IF port.

Modulation did work, but I was probably overdriving something because the spectrum looked awfully wide and jagged.

CDM324 can be modulated on the +5V line too, so there are two ways to do it.

But .... it is more than 3 times as sensitive as an HB-100, so much more care must be taken on the electronics side.