Old-school AM walkie talkie

Discussion in 'Amplitude Modulation' started by W0RIO, May 7, 2019.

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  1. W0RIO

    W0RIO Ham Member QRZ Page


    I found this photo a while back in an online copy of an old railroad magazine,
    I think it was called American Railroad or something similar.
    The device was called a CarryPhone and was used by railroad men to
    communicate with the engine and caboose while walking up and down the train.

    That reminds me of some Bob Dylan lyrics ;-)
    Mona tried to tell me
    To stay away from the train line
    She said that all the railroad men
    Just drink up your blood like wine
    An’ I said, “Oh, I didn’t know that
    But then again, there’s only one I’ve met
    An’ he just smoked my eyelids
    An’ punched my cigarette”
    Oh, Mama, can this really be the end
    To be stuck inside of Mobile
    With the Memphis blues again
    KD2ACO and N0TZU like this.
  2. KL7AJ

    KL7AJ XML Subscriber QRZ Page

    W0AQ likes this.
  3. KB1ILS

    KB1ILS Ham Member QRZ Page

    Wonder what the RF exposure safety measures were back then...if any.
  4. WD4IGX

    WD4IGX Premium Subscriber QRZ Page

    At the power level and frequencies that thing likely ran? Wouldn't matter.
    KW6LA, AC0OB and AD5HR like this.
  5. W7TFO

    W7TFO Platinum Subscriber Platinum Subscriber QRZ Page

    Doubles as portable diathermy...

    WD4IGX likes this.
  6. K5UJ

    K5UJ Ham Member QRZ Page

    I'm just trying to decide if this is humor or a sucker to the RF Exposure :eek: propaganda.
    AC0OB, WZ5Q and K4KYV like this.
  7. SM0AOM

    SM0AOM Ham Member QRZ Page

    This is a piece of equipment that uses low-frequency magnetic induction instead of electromagnetic waves for communications, somewhat along the lines of the Preece "inductive wireless telegraph" that predated Marconi with some years.

    There are contemporary products doing this, one is the "Rockphone" that enables voice and data communications in caves.


    KD2ACO likes this.
  8. K4KYV

    K4KYV Premium Subscriber QRZ Page

    But remember, 50-60~ magnetic fields from power lines, house wiring and other sources are hazardous as well, causing leukæmia in children. I know it's true because I read it over the internet.
    K5UJ and WZ5Q like this.
  9. KD2ACO

    KD2ACO Platinum Subscriber Platinum Subscriber Life Member QRZ Page

    Warms up your liver at work to efficiently metabolize the beers afterwards.

    Great picture!
  10. AC0OB

    AC0OB Platinum Subscriber Platinum Subscriber QRZ Page

    VLF obviously but,

    What is a quasi-static ac magnetic field?


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