Conrad Course material 10090 14 years and over 10090 Manual De Usuario
Los códigos de productos
10090
Scale Reconciliation
The radio is now completed. Only the scale needs to be set. The printed-on figures should correspond
to the frequency set as precisely as possible. "55" means 550 kHz, "160" means 1,600 kHz.
For reconciliation at the upper end of the scale, use the corresponding trimmer on the variable
capacitator. Find a known station at upper end of the band and set the trimmer so that the scale is as
precise as possible here. At the lower end of the band, reconciliation is possible by adjusting
inductivity of the oscillating circuit coils. This is possible when all three coils are as close together as
possible on the pinboard. Magnetic coupling and mutual influence changes inductivity slightly. You
may try out reversing polarity of the smaller coils with 47 µH to change inductivity by a few percent.
Fine adjustment is possible by slightly adjusting the distance between the coils. Adjustment at the
lower end slightly moves the upper band end. Therefore, repeat reconciliation with the trimmer.
The dial was put on initially so that the left and right stop are on a horizontal line. If reconciliation is
not perfect, you may put on the dial slightly offset to improve accuracy. This is a matter of dexterity.
The inductiveness of the entire oscillating circuit coil also slightly depends on the size and placement
of the loop aerial. If you increase the aerial to improve reception, the reception frequency will be
moved slightly downwards. Reconcile the scale again.