Wednesday, December 11, 2024

An Evening Bandscan on 40 Meters using the High-School Direct-Conversion Receiver


This video shows how useful this receiver really is.  Build one of these!

1 comment:

  1. Hi Bill,
    I watched the full video, and it sounds spectacular, with great DCR presence! It also proves that in the busy evening 40 meter RF environment, the lack of single-signal capability didn't impair usefulness one iota.
    Two questions:
    1) Was the audio output to the HB speaker directly from the output transformer of the Third Audio Stage? Sounds like ample volume.
    2) Could you make a measurement of the LO leakage for me? Set the RF attenuation for minimum (max RF gain), tune the double-tuned filter in band center (no stagger tune) if you can.
    Take spectrum analyzer data across the band. That will give us an idea what LO rejection you are getting with no problems.
    Mucho TNX in Advance! 73de WN2A

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