L3 tuning
   Signal is applied at the circuit I/P passes along the amplifer chain
   via amplifier U9 to drive the two tuned circuits.
   The O/P of the tuned circuit is rectified and tuning is done by
   monitoring the dc out of the rectifier TP3.

If a problem occurs then:
   Test 1 has shown the U9 has an I/P so faultfinding can start by
   checking the O/P of U9 on TP2 - Square wave ÷ 3Vp-p
   check for sinewave on the end of R9 remote from TP2.
   R11 should have 5V on one end and ÷ 0.5V on the other
   Check Q5 for correct orientation
   check C11,C12,L3,Q5,R14,R12,C15,R17,C16 for value, and soldering faults

   Test 5 has the same frequency in a burst and allows a check for
   a burst envelope on R14 and TP3 which might be useful in finding the
   fault.

