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  2. File:Tuned radio frequency (TRF) receiver block diagram 2.svg

    en.wikipedia.org/wiki/File:Tuned_radio_frequency...

    English: Block diagram of a tuned radio frequency (TRF) receiver, a type of radio receiver circuit invented in 1916 by Ernst Alexanderson and widely used in the vacuum tube receivers of the 1920s.

  3. File:Double-conversion superheterodyne receiver block diagram ...

    en.wikipedia.org/wiki/File:Double-conversion...

    In order to achieve both good adjacent channel selectivity and image rejection, the double-conversion receiver uses two intermediate frequencies (IFs). The incoming radio frequency (RF) signal from the antenna is first mixed with a sinusoidal signal from the 1st local oscillator (LO) to give a high 1st IF frequency. Since the separation between ...

  4. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    4. Select Authenticator app for your 2-step verification method.-To see this option, you'll need to have at least 2 recovery methods on your account . 5. Click Continue. 6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1.

  5. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    CAD: computer-aided design, computer-aided drafting; cadmium [plating]: CAGE: Commercial and Government Entity [code]: A CAGE code is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the part defined by the drawing.

  6. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.

  7. The Container Store files for bankruptcy - AOL

    www.aol.com/finance/container-store-files...

    The Container Store has filed for bankruptcy. It is the latest well-known retailer to fall victim to customers cutting back on discretionary spending. The 46-year-old company said in a statement ...

  8. How Robert F. Kennedy Jr. could impact the healthcare ... - AOL

    www.aol.com/finance/robert-f-kennedy-jr-could...

    Robert F. Kennedy Jr.'s nomination to lead HHS is causing cautious concern among investors. Here's which companies and stocks could be impacted, as well as which policies are in line for disruption.

  9. Lever tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Lever_tumbler_lock

    The Chubb detector lock is a variation of the lever lock which was designed to detect and prevent picking attempts. Lever locks can be drilled, but usually a template or stencil is required to mark the drilling point, as the lock mechanism is commonly mortised into the door and so it is harder to determine the point at which to drill.

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