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Radar Question

Discussion in 'Electronics' started by CSkipR, Nov 8, 2013.

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  1. CSkipR

    CSkipR Member

    Joined:
    Aug 16, 2008
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    Location:
    New Smyrna Beach, Fl
    When I change the range scale from say 72nm down to 1 nm does something inside the array lower so it picks up objects closer? If not how does this work?
  2. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
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    8,420
    Location:
    Satsuma, FL
    There is nothing in the raydome or array that mechanically changes. When your range reduces, video memory becomes more dense. Pulse timing, tuning, gain are adjusted with every setting of the range knob.
    Ways to understand video memory; Think of wheel spokes, the further away from the hub, the more air between the spokes. Less detail at longer range. Spokes are more dense closer to the hub, more detail. When you look at long range, the rang knob reduces close range returns.
    Move the range knob in, we attenuate & display the closer targets a bit more.
    Mfgs have tried different things to help, speeding up, slowing down the scan rate, adding more spokes to their timing patterns and covering more detail in distant scans. But the above is the basic theory for them all.
  3. CSkipR

    CSkipR Member

    Joined:
    Aug 16, 2008
    Messages:
    934
    Location:
    New Smyrna Beach, Fl
    Great explanation. Thanks