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This station is EA8AN from Canárias Island , in AM, during the weekend AM QSO on 40m

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.

This is an AM portuguese QSO on 16 - 02 - 2010 on 40m. AM QSOs is back again, with the increment of NVIS conditions. Today NVIS was up to 9MHz and MUF up to 32 MHz.

This is the sound from CT1WV on 80m, 3690 KHz, with a QQE06/40 plate modulated by a pair of 6146 during the night QSO 21-01-2008

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This is the sound of USA Ham radio AM station W1IA, received by me this night 21-02-2008, on 80m , 3705 KHz