TCA440 prototype doble conversion HF receiver

This is a 40m TCA440 based dual conversion receiver. First IF is 455KHz, and 2ª IF is 12KHz. his low if is for use a simple LC filter to sideband filtering.
The first part of the movie was make at 20:30 UTC under strong signals from broadcastings above 7200KHz, and in the next day during the day, under NVIS propagation.
This receiver have a TCA440 as receiver and AGC, a NE602 converting 455KHz in 12KHz, and another NE602 as product detector, with the oscilator runing at 13,5KHz.
The LO for converting 455 in 12KHz is done by a 2N2222 with a color burst crystal (4.430 KHz) divided by ten by a counter IC 74LS90.to give the 443KHz LO signal need for 12KHz conversion.

TCA440 prototype doble conversion HF receiver ham radio canada
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Science & Technology YouTube Video Editor View attributions	Upload TimePublished on 27 Dec 2013

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