Yes, that was the intention.
You may use this setup:
The external tracking mixer has three ports, LO, RF and IF. I'm assuming the IF port is connected to the diodes in the mixer so it can go down to zero Hz
TinySA in low input mode with tracking output enabled.
The external tracking mixer LO port is connected to the high output of the tinySA.
The mixer drive of the tinySA normally is set to +9dBm but if needed for the tracking mixer you can increase the drive to +15dBm.
You have an external generator that is set to the IF of the tinySA (433.8MHz normally) and is connected to the RF port of the external mixer.
The IF port of the external mixer will now output (amongst other) the signal tracking the scan frequency of the tinySA.
You may clean up the IF output by using a LPF connected to the IF port. With a 300MHz LPF you will also reduce the leakage from the RF port thus increase the dynamic range.
Make sure your external generator output is below mixer drive minus 10dB to avoid overloading the external mixer.
The output signal of you tracking generator will be at external generator output level minus 7-9dB. You may add a amplifier after your LPF but it is not needed as the tinySA is sensitive enough.
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