Again AM power , A new view

Discussion in 'Amplitude Modulation' started by WA1HLR, Mar 20, 2018.

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  1. WA3VJB

    WA3VJB Ham Member QRZ Page

    The end result is the same, and rolling it back would probably be difficult. Carefully looking at the IARU bylaws, if "damage" can be shown to constituents represented by the "member society," that club can be punished and de-certified by the IARU board of directors. In this case, if DARC advocated such a change in Germany's government regulations, they can be blamed for harming any licensee who had an interest in AM on HF.
  2. W1VTP

    W1VTP Ham Member QRZ Page

  3. W1VTP

    W1VTP Ham Member QRZ Page

    I'd like to see the math on this hypothesis! Is this a power distribution over bandwidth thing? Never heard of it before. Just how does one measure it with equipment available to the amateur radio operator
  4. W1VTP

    W1VTP Ham Member QRZ Page

    The vast chasm is the reality of what watts PEP is and what "thinking" some amateur radio operators use to justify mega powered AM operation
  5. K4KYV

    K4KYV Subscriber QRZ Page

    At the FCC forum at Dayton one year, the speaker stated that their inspectors used a Bird 43 wattmeter, and that if he had his way that would be the standard written into the rules, except that (unfortunately) the FCC cannot officially endorse a commercial product made by a particular manufacturer.

    But how will that FCC inspector, who according to a Commission statement made during the original rulemaking proceeding would need to undergo costly "special training" merely to learn how to accurately measure the output of an AM transmitter in terms of its carrier power, determine the power of a transmitter that doesn't have a 50Ω output feeding a coax line, with a Bird 43 as his measuring instrument? What if he encountered a homebrew transmitter that didn't have a sprig of coax anywhere in the antenna system between the PA tank coil and the radiating element of the antenna?
    AC0OB and WZ5Q like this.
  6. W3RSW

    W3RSW Ham Member QRZ Page

  7. K7JEM

    K7JEM Ham Member QRZ Page

    A Bird 4314 meter will read PEP accurately. Perhaps this is the meter the FCC is talking about? It uses the Bird 43 elements, but has additional circuitry to measure peak and burst RF.
  8. WA5VGO

    WA5VGO Ham Member QRZ Page

    For determining RF power, I imagine they’d apply an efficiency factor to the power input. They can determine the modulation % with a scope. If they really want to go after someone, they’ll find a way.

    Last edited: Nov 25, 2018
    K7JEM likes this.
  9. K5UJ

    K5UJ Ham Member QRZ Page

    For other FCC regulated services using SSB, how is the power limit specified and measured? Anyone know?
  10. SM0AOM

    SM0AOM Ham Member QRZ Page

    For the fixed, land-mobile, aeronautical and maritime services, the SSB power metric has been PEP output by international agreements since a very long time which the FCC honour.

    Some are more informal, such as for land mobile and fixed SSB,
    but others are incorporated into treaty obligations such as the Annex 10 to the Convention of Civil Aviation which regulates Aeronautical Telecommunications on a global scale.

    These also correspond to decade-old industry performance standards and practices.


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