Discriminator hack for the Albrecht AE67H scanner
Based on http://www.discriminator.nl/ae65h/index-en.html
To get rid of the ~700kHz sawtooth IF-component signal (sorry, we forgot to take picturs
of the oscilloscope showing the IF-component...) we used a lowpath filter made of a 12k ohm resistor and a 2.2nF capacitor
to filter out interferencing signals higher than 6kHz.
The opened device. Sorry for the bad quality of the picture.
pic1
A wire for testing soldered to the discriminator output.
pic2
The RC circuit.
pic3
Some shrinking hose for the RC circuit... not a good idea, because we forgot
to solder the wire for the output...
pic4
Shrinking hose removed, wire attached :)
pic5
pic6
Shrinking hose rocks...
pic7
Capacitor soldered to ground.
pic8
Resistor soldered to discriminator output.
pic9
Quite finished...
pic10
Without the lowpath filter, we had a strong ~700kHz sawtooth IF-component,
with the filter, only nice atmospheric noise ;) Sorry, we had no testsender
to show a clean signal.
pic11
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pic13
Attached RCA jack
pic14
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Mail your comments or suggestion for improvement to
Tobias 'grondhal' Hain th@g23.org
I'll publish it here (if you agree)