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8001RE: RE: [RADIOSHACKDX394] Re: WBCQ (was "Hollow" sound with TWO Antennas)

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  • William Barrett
    Oct 10, 2013
      Also, I suddenly remember, AFRTS HF service still has three frequencies,
      I forget what, that carry entertainment, news, and sports mostly to ships
      and small outpost units field deployed who don't have any satellite stuff.
      They could be off-air for the Great Washington Money Siezure, but those
      HFers can be goggled.  They are also AM hybrid SSB with upper sideband
      and carrier only.  If I also recall rightly, the S meter bounces as you listen,
      which indicates a variant of "carrier control modulation" where the carrier is
      strong enough instant by instant to "hold up" the modulation level at that
      instant, and rests at a lower power out when modulation is low-level or
      -----Original Message-----
      From: RADIOSHACKDX394@yahoogroups.com [mailto:RADIOSHACKDX394@yahoogroups.com]On Behalf Of joerotello@...
      Sent: Wednesday, October 09, 2013 14:45
      To: RADIOSHACKDX394@yahoogroups.com
      Subject: RE: RE: [RADIOSHACKDX394] Re: WBCQ (was "Hollow" sound with TWO Antennas)


      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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