Episode 2019-10 - Transmitters and Receivers

Hello and welcome to the next edition of the Mike Wills Podcast! This is the Dog Days of Podcasting edition for {insert date here}. I am WX0MIK and my name is Mike Wills. This season, we are covering amateur (or ham) radio.

  • Section 5.2 actually starts talking about radios.
  • Selecting Band, Frequency, and Mode
    • One thing nice about Amateur Radio, unlike other services, is that we can select what frequency we want to transmit on (assuming we are licensed for it).
    • We can also use multiple modes which you can't in other services
    • First pick your band, then using the VFO (variable frequency oscillator) choose your frequency
    • Then choose your signal type (if you can)
    • Some radios have memories so you can quickly go back to a certain frequency.
  • Transmitter Functions
    • Microphone Gain - much like in podcasting, this controls your speech volume.
    • PTT (push-to-talk) - switches the radio from receive mode into transmit mode.
    • Key - is used for morse code. There are several different types mentioned in the book.
    • They also mention using a dummy load for testing. A dummy load will not actually transmit but will allow testing radio equipment without transmitting and signals.
    • Overdeviating/Overmodulating is talking too loud into the mic (much like the distortion is recorded audio)
  • Receiver Functions
    • A receiver has a tricky job of pulling only the signal you want while filtering out everything you don't
    • The AF gain or volume control does what we think it does, make it LOUDER.
    • On HF Radios
      • RF gain will finetune the sensitivity to incoming signals
      • Attenuator will reduce the strength of the incoming signals from overloading the receiver
    • They talk about how you can use filtering and tuning to improve signals.
    • They also mention that many radios have a signal meter with a range of S1 to S9 and anything strong than S9 is shown as dB greater than S9.
  • VHF/UHF RF Power Amplifiers
    • They mention you can use this in conjunction with your handheld to increase your transmission strength.
  • Transverter
    • They mention a thing called Transverters
    • You can take a signal at one frequency and are shifted to a new frequency. When they mention mixer, this is on an audio mixer, but a certain type of radio circuit.

Thank you for listening. 73 from WX0MIK.

  • podcast/ddop/public/episode_201910.txt
  • Last modified: 2019/08/10 03:43
  • by mikewills