Enter the maximum DC voltage level measured at tp40(in volts)
If you have access to a frequency meter record the DC voltage at tp40 for incoming frequencies from 20KHz above the resonance frequency of the tuned circuit
Plot the DC voltage at tp40 against frequency and check that the response is similar to that shown in
Carefully adjust the signal generator to provide the carrier frequency of 455kHz. By making very small adjustments whilst monitoring the DC voltage at tp40 check that this frequency occurs approximately halfway up the left-hand slope of the response. If it does not it may be that T4 needs adjusting. To do this follow the instrctions given in Appendix 1 'Adjustment of Tuned Circuits'