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podcast:ddop:public:episode_201910 [2019/08/10 03:20]
mikewills [Notes]
podcast:ddop:public:episode_201910 [2019/08/10 03:43] (current)
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   * Section 5.2 actually starts talking about radios. ​   * 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. 
 ===== Wrap Up ===== ===== Wrap Up =====
 Thank you for listening. 73 from WX0MIK. Thank you for listening. 73 from WX0MIK.
podcast/ddop/public/episode_201910.txt · Last modified: 2019/08/10 03:43 by mikewills