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    Re: Listening to WWV from 60N 30E
    From: Paul Hirose
    Date: 2018 Sep 28, 14:50 -0700

    On 2018-09-27 13:45, Tony Oz wrote:
    > As a SW-listener I can confirm that WWV is not easy to listen to - from my 
    QTH (of 60°N 30°E). Their time-ticks are quite discernible at times but their 
    voice messages are far too weak. My guess - they use the worst modulation 
    available: AM. If they had a properly compressed voice over SSB - the usable 
    range of their transmissions would be much wider. Even DSB with an 
    unmodulated carrier (for compatibility with valve/tube-radios!) is more 
    > My rig is Sony ICF-SW100 and a 5-meter long wire "antenna".
    > When there is a propagation - I do hear them at 10MHz and 15 MHz, at 5MHz 
    they are squarely under the BPM's loud transmission.
    There's more to WWV than time ticks and voice. It is also a frequency
    standard. For example, the Winradio Excalibur receiver has a feature
    which displays its frequency error (parts per million) with respect to
    the carrier. If desired, the radio will calibrate itself to the carrier.
    That won't work with a single sideband signal since there's no carrier.
    Also, audio frequencies in a demodulated SSB signal are affected by any
    error in the receiver tuning. Each Hz of error shifts the whole audio
    spectrum up or down the same amount. Thus the 440 Hz tone from a single
    sideband WWV would not be reliable for testing a musical instrument tuner.
    Canadian station CHU transmits upper sideband plus carrier. It avoids
    interference by operating far from the standard time frequencies.

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