Low phase noise 144 MHz 2 tone generator for LNA IMD test
the full two tone generator article will be published soon
This is just the comparison between the tone generated by the internal calibrator of my Tektronix 495p and the tone generated by the home-brewed quartz generator (one of the 2 tones generator used for LNA IMD tests).
It is not an absolute p/n measure, but a kind of comparison just for fun.
A huge difference is anyway noticeable:
the tone at left is my quartz generator, the tone at the centre is the Tek 495p internal calibrator at -20 dBm.
The images are saved on 495 memory, no interaction between the two signals has occurred.
Both carriers are seen with 20 kHz Span, 100 Hz BW, no video filter.