February 19, 2012

KN-Q7A Single Band SSB Transceiver Kit - Step 5: IF Crystal Filter

This is the 8th article in our series on building the KN-Q7A Single Band 40m SSB Transceiver Kit. In our prior article, we completed the receive intermediate-frequency (IF) amplifier.   The IF amplifier section amplifies signals after they have been converted to the fixed intermediate-frequency value by the frequency converter.

In this article we proceed with building Step 5: IF Crystal Filter.  This section provide post IF amplifier filtering of the received signal.  The filter circuit consists of a network of 6 crystals and 7 capacitors along with 2 relays.

We followed the instructions and installed the parts without incident.

KN-Q7A build through Step 5:  IF Crystal Filter

Lessons Learned
  • Having your parts sorted in a muffin tray or something similar really makes it easy to locate the correct parts quickly.
  • Orient the crystals and capacitors the same way for a more pleasing appearance.
In the next installment the fun continues as we proceed with building Step 6: Mixer and VXO Local Oscillator.

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