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7996RE: RE: [RADIOSHACKDX394] Re: WBCQ (was "Hollow" sound with TWO Antennas)

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  • josephrot
    Oct 9, 2013

      Ahh, great minds think alike. I had a "deeper" explain also using the venerable CHU as example of suppressed LSB, but the Great Yahoo ate it on me.

      FWIW, I was able to compare that "hollow" sound on both a DX-394 and the Sat 800 a second and third time, and if one sets the Sat 800 bass/treble to mid position, pretty much flat but still in circuit, the Sat 800 also exhibits the hollowness at times on same and similar signals.


      Strong brew for some,interesting technical tid-bit for us all, perhaps.

      Joe Rotello / Knoxville, TN / USA

      ---In RADIOSHACKDX394@yahoogroups.com, <radioshackdx394@yahoogroups.com> wrote:

      Station "CHU" in Canada does the same thing.  The lower sideband is
      suppressed, and only the upper is heard.  3.335, 7.850,  14.670.
      Try it.
      -----Original Message-----
      From: RADIOSHACKDX394@yahoogroups.com [mailto:RADIOSHACKDX394@yahoogroups.com]On Behalf Of c dorcey
      Sent: Monday, October 07, 2013 22:03
      To: RADIOSHACKDX394@yahoogroups.com
      Subject: [RADIOSHACKDX394] Re: WBCQ (was "Hollow" sound with TWO Antennas)


      I tuned up on WBCQ one night with my "better" radio (a Kenwood TS-940S transceiver).  Since WBCQ is a broadcast station, I was in AM mode, of course.  However, sometimes I can get a better sound by selecting one sideband or the other, depending on the interference conditions, and I was astonished to hear that WBCQ had NO lower sideband!  I don't have a spectrum analyzer to visually prove this, but switching from USB to LSB made the signal almost inaudible.  Unlike the suppressed-carrier SSB modulation that hams use, WBCQ must have been radiating enough unmodulated carrier to support AM demodulation, but that might explain something of the odd audio you report.  If I had tried this with my DX-394, I would have had to retune every time I switched sidebands, because the BFOs were badly off-frequency, and I might not have been able to zero-beat the main carrier very well, because the DX-394 tuning increment is so small.  But the TS-940 has 10 Hz tuning, and proper sideband processing.
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