I am trying to move a Q 202 G from the 170 mHz range down to the 147 mHz
range and have run into a problem on the notch tuning. The high pass
tuning works like a charm and has a good pass and notch characteristic.
The low pass side is another story. The pass tuning works fine, but I
can't get a notch. With the tuning rods all the way in, it is starting
to notch, but only about 20 db.
Here is the strange thing - I took the coupling loop out of the high
pass side and compared it to the low pass side, and they are identical.
The tuning rod varies the capacitance across the single loop connector
and there is no inductance in the circuit for either high pass or low
pass side. How does the same hookup work to allow a notch on the low
side as well as the high side?
I am tempted to add a small fixed capacitance across the loop to see if
that helps the tuning for the low pass side..
Any comments on which way to go?
73 - Jim W5ZIT
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