CW schrieb:


Anyone with any electronics experience would know that components have
tolerances. The variation between components will mean that a non adjustable
tuned circuit may very well not be tuned as well as it could be. Making
things non adjustable is cheaper but the trade off is that you have to
except less than optimum performance.


Who says that this thing ist not adjustable?
I have a PCR1000 wich is a nice toy to play with. This thing has not a
single adjustment screw inside. It is all done by programming switches
with external software via RS232 interface. All you need ist just the
right high frequency signal injector device for different signal levels
signal forms and modulation. Also an oscilloscope to check the audio
output waveform and level.

odo