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SoftRock 6 Exciter meets FCC signal purity requirements?

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  • Bruce Beford
    According to current FCC regs, any spurious (unwanted) emmisions must be greater than 43 dB down from the carrier level. (See below) The old standard for QRP
    Message 1 of 1 , Oct 1, 2006
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      According to current FCC regs, any spurious (unwanted) emmisions must
      be greater than 43 dB down from the carrier level. (See below) The old
      standard for QRP transmitters was 30 dB. The 30dB figure is only
      allowable for QRP (less than 5W) transmitters placed into service
      before Jan 1, 2003. For new transmitters (post 1/1/2003) it must be
      better than 43 dB down, regardless of power level. Can the SR6 exciter
      be made to meet this spec?

      -Bruce N1RX

      (From FCC Part 97 rules):

      ยง97.307 Emission standards.

      (d) For transmitters installed after January 1, 2003, the mean power
      of any spurious emission from a station transmitter or external RF
      amplifier transmitting on a frequency below 30 MHz must be at least 43
      dB below the mean power of the fundamental emission. For transmissions
      installed on or before January 1, 2003, the mean power of any spurious
      emission from a station transmitter or external RF power amplifier
      transmitting on a frequency below 30 MHz must not exceed 50 mW and
      must be at least 40 dB below the mean power of the fundamental
      emission. For a transmitter of mean power less than 5W installed on or
      before January 1, 2003, the attenuation must be at least 30 dB . A
      transmitter built before April 15, 1977, or first marketed before
      January 1, 1978, is exempt from this requirement.
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