1968 Hallicrafters shortwave radio in Ham QSO - Morse code practice with captions

Sdílet
Vložit
  • čas přidán 22. 01. 2024
  • Will the old Hallicrafters suffice in a CW QSO?
    Morse Code practice with captions. Remember, if you want a little more or less speed you can adjust it on CZcams's tool bar Settings Playback speed.
    The 1968 Hallicrafters WR-600 (S-120) is now in QSO use with Dave Cripe’s (NM0S) Hi-Per-Mite filter providing the needed additional filtering. This video is from Tuesday's 80m morning rag chew. I transmitted with an Icom and used an MFJ T/R switch (1708B-SDR). On transmit, the Hallicrafters is grounded and 100% of the output power goes to the antenna system. On receive, the signal is split equally between the Icom and Hallicrafters.
    According to the Hi-Per-Mite filter assembly manual, it uses "four, two-pole Sallen-Key op amp filters; three low-pass filters, and one high pass filter. Each filter section is fairly low-Q, and the frequencies of resonance are staggered. Cascading these four sections in series creates the optimal filter response." The filter circuit is based on the Dave's May, 1994 article in '73' magazine. The filter kit is still listed for sale at less than $30 on 4sqrp website. The Four States QRP website has link to the magazine article, well worth reading.
    The external Beat Frequency Oscillator (BFO) 455 KHz is a Ten-Tec kit module board kit model 1050, no longer in production. The external BFO seems to work a little better than the Hallicrafters' internal BFO. Antenna is half wavelength dipole coax fed feed point height of 26 feet (8 meters) above ground surface.
    In December of 1968 the first manned spaceflight reached the Moon and, aside from watching a few of those key events on TV, I was listening to this shortwave radio which I am still doing today!
    73,
    NG9D
  • Věda a technologie

Komentáře • 2

  • @QRPCW
    @QRPCW Před 5 měsíci +1

    Sonido celestial ❤

  • @N9CQX
    @N9CQX Před 5 měsíci

    CW fun-TNX Lynn