How does IF-stage in L1000T tuner work?

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elfenthau

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Joined 2015
Hello,
some time ago i bought a used Kenwood L1000T tuner. Very nice device!!
While trying to understand what Kenwood has constructed there, i realized
that i do not really understand how that simple IF-stages works :-o.
I am especially wondering where the RSSI DC signal is coming from in
that IF stage. I expected to see just a pure AC signal at the emitters of that
differential amplifier but obviously something puts a DC there which is correlated
to the IF level strenght.
Can anybody explain why there is a IF level related DC at the emmiters?

Thank you
Dirk
 

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