Quote:
Originally Posted by Rubin
Hello Franco
You write:
We cannot use an oscilloscope for measurements in the sensor stage and for the adjustment need only one voltmeter is required to connect to the output of the filter R16, C18 without the use of the oscillator.
If we have 2-4volts DC output, this means that the sensor stage is working properly without oscillations.
But .... we can have oscillation, because a voltmeter can not show it and let us have an output in the range 2-4v DC
My question.
Can we use the oscilloscope to properly adjust the trimmer on the TR3 emitter or is it practically setting in the field?
Please explain more
Thank you
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in the helps I wrote: "For the first test do not connect quartz then look at out point, the DC voltage must be 0V.". The sensor stage output is always a DC voltage, rectified by the two diodes. This voltage is the rectified 8Mhz signal. The use of the oscilloscope is only for verifying the proper functioning of the oscillator. Outdoors there is no need for any adjustment other than the threshold and gain in the stage display.