forgotten modes

Discussion in 'Working Different Modes' started by KA1BSZ, Dec 16, 2020.

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  1. KC3TEC

    KC3TEC Ham Member QRZ Page

    you got that right LOL.
     
    W7UUU likes this.
  2. KK9W

    KK9W Ham Member QRZ Page

    I just picked one up for $25. Making use if it shall be fun.
     
    W4KYR likes this.
  3. KD8DEY

    KD8DEY Ham Member QRZ Page

    There's Hope
    Smoke Rope.
     
  4. KC3TEC

    KC3TEC Ham Member QRZ Page

    a little clarification here
    cw stands for continuous wave when you are using cw you are interrupting the carrier wave in a series of long and short pauses
    you communicate on continuous wave by means of morse code
    morse code could be confused as digital because it consists of only 2 types of pauses or interrupts if you prefer.
    But you are sending interrupts directly on the carrier wave, therefore the signal is in 3 distinct phases dit (short interrupt), dah( long interrupt) and pause (no interrupt) and this is not binary
    don't confuse cw with digital (binary)communication because they are 2 different animals

    true digital communication involves translating any data or message into binary code for transmission purposes and is sent in packets of data.
    these often consisted of 4 bit, 8 bit, characters and 16 bit 32 bit words and 64 bit and 128 bit phrases
    any coded language has decoder methods including morse and can be displayed many ways to make it readable.
    binary has to be translated to machine language then to hexadecimal, them to the alpha numeric characters we all know usually by a computer system.

    what cw communication is however is the forerunner and father of digital communication

    telegraphy itself using wire, ticker tape. sounders and lights did not rely on a carrier wave but relied on a pulse of electricity. and was usually morse code. or in some instances ciphered code
    was indeed the first form of digital
    But continuous wave is not a wired system
     
    Last edited: Dec 17, 2020
  5. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page


    Well that may be your definition of digital and it would apply now. but CW could certainly be encoded and decoded are at least continuous wave and Morris on a telegraph line .
    the Germans had a machine that did that in War 2 along with all the other militarys.
    And since majority of people can't copy CW nowadays they use a decoder with their computer.
    Longs and shorts are a form of digital Communications/ they've been used for really centuries if you include mirrors, lights and smoke!
     
  6. W2VW

    W2VW Ham Member QRZ Page

    Actually your post was likely not completely read by anyone over the age of 50.

    Paragraphs help but spacing makes an ever larger difference to lots of nerds with poor eyesight.
     
    K6CLS likes this.
  7. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    20201216_182945.jpg

    Decode this CW!
     
    K8PG, KA1BSZ, PU2OZT and 1 other person like this.
  8. KC3TEC

    KC3TEC Ham Member QRZ Page

    no its not a my definition I hold a degree in computer technology and networking this is by definition what digital is.
    cw is the medium morse is the communication standard.
     
    PU2OZT likes this.
  9. KC3TEC

    KC3TEC Ham Member QRZ Page

    misunderstanding information often happens due to the way people interpret it. each person can read a sentence and no 2 people will read it the same.
    as i stated above in telegraphy morse is considered digital because its current pulses on an otherwise dead line and is a form of a binary signal (on and off)
    carrier wave is the opposite you have a signal running all the time and you interrupt the signal when the key is shorted (depressed)
    the following is directly of the wiki page
    Very early radio transmitters used a spark gap to produce radio-frequency oscillations in the transmitting antenna. The signals produced by these spark-gap transmitters consisted of strings of brief pulses of sinusoidal radio frequency oscillations which died out rapidly to zero, called damped waves. The disadvantage of damped waves was that their energy was spread over an extremely wide band of frequencies; they had wide bandwidth. As a result, they produced electromagnetic interference (RFI) that spread over the transmissions of stations at other frequencies.

    This motivated efforts to produce radio frequency oscillations that decayed more slowly; had less damping. There is an inverse relation between the rate of decay (the time constant) of a damped wave and its bandwidth; the longer the damped waves take to decay toward zero, the narrower the frequency band the radio signal occupies, so the less it interferes with other transmissions. As more transmitters began crowding the radio spectrum, reducing the frequency spacing between transmissions, government regulations began to limit the maximum damping or "decrement" a radio transmitter could have. Manufacturers produced spark transmitters which generated long "ringing" waves with minimal damping.

    Transition to CW
    It was realized that the ideal radio wave for radiotelegraphic communication would be a sine wave with zero damping, a continuous wave. An unbroken continuous sine wave theoretically has no bandwidth; all its energy is concentrated at a single frequency, so it doesn't interfere with transmissions on other frequencies. Continuous waves could not be produced with an electric spark, but were achieved with the vacuum tube electronic oscillator, invented around 1913 by Edwin Armstrong and Alexander Meissner. After World War I, transmitters capable of producing continuous wave, the Alexanderson alternator and vacuum tube oscillators, became widely available.

    Damped wave spark transmitters were replaced by continuous wave vacuum tube transmitters around 1920, and damped wave transmissions were finally outlawed in 1934.
     
    PU2OZT likes this.
  10. K6CLS

    K6CLS Ham Member QRZ Page

    Yes, precisely!
     
    PU2OZT likes this.

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