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The board is designed in a way that its components are all as-
sembled in SMD technique around the actual TDA7088 re-
ceiver. That makes construction easy. You can exchange some
of the wired components you have soldered yourself to modify
certain properties of the radio. R1 defines the tunable frequen-
cy range. A smaller resistor will enlarge the tuning range. This
makes sense, for instance, if you want to operate the radio with
NiMH batteries at 2.4V. R2 determines the width of the AFC
catch range. If you want, for instance, to receive weak stations in
the vicinity of stronger stations it may be useful to decrease R2
down to 100 k
Ω or less to get a smaller capture range. The two
RE1 and SC1 connections on the board remain initially free.
They are intended for subsequent extensions. The TDA7088
was originally designed for button tuning. You can find the
reset and scan buttons in the wiring diagram. If you want to
adapt the receiver accordingly, you have to separate the PT2_2
connection to the slider of the frequency control. You can also
insert a switch here so the receiver can be tuned optionally with
the buttons or the potentiometer.
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