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Hello,

I was reading through the documentation and was curious about the external modulation function. Does this allow one to input through the high input either modulated audio or a modulated tone that is of a different frequency from the built in 800hz tone?

Thank you,

- Mike

The low output signal is created by mixing a fixed 433.9MHz signal with an LO at 433.9MHz + the required output frequency.?
The external modulation option disables the build-in LO and connects the mixer LO input to the high port. So a better name should have been "external LO"
In this configuration you can use two tinySA's to create a tracking generator option with a possible offset (within +/- 500kHz) by connecting the high input of the tinySA in external modulation mode to the LO output of another tinySA.
This is exactly how the tracking generator of the early HP spectrum analyzers worked.
See this post:?/g/tinysa/message/10
Disadvantage of the direct coupling as shown in above post is the reduced dynamic range (max 70dB) due to reverse leakage through the mixers of the two tinySA. This can be solved by putting an isolation amplifier in between.

The current HW has no input possibility for modulation input

It may be possible to set the modulation frequency in some range