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podcast:ddop:public:episode_201907 [2019/08/07 03:25]
mikewills
podcast:ddop:public:episode_201907 [2019/08/07 03:42] (current)
mikewills
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-====== Episode 2019-07 - Show Title ======+====== Episode 2019-07 - Feed Lines and SWR ======
 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. 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.
  
 ===== Notes ===== ===== Notes =====
-  * Unordered List Item+  * 4.3 Feed Lines and SWR 
 +  * Feed lines connect the radio to the antenna. They are also used when an RF signal needs to be conducted from one piece of equipment to another. 
 +  * The big thing you need to know about in this section is feed line loss. 
 +  * Coax Cable 
 +    * Coax is one of the most popular feed lines. It has a wire center which is surrounded by an insulator. The insulator is covered with a tubular shield of braided wire or foil then covered with a jacket. 
 +    * The best coax is called hard line which has the lowest loss of any type of feed line. 
 +  * They talk about how most cable used in ham radio has a characteristic impedance of 50 ohms and what characteristic impedance actually is. 
 +  * There is mention of ladder line, window line, and twin-lead which two parallel wires is also briefly mentioned.  
 +  * What is SWR? 
 +  * SWR or Standing Wave Ratio is where the power carried by a feed line is completely transferred to a load (like an antenna). In layman'​s terms, the full power can't be transmitted,​ so it gets sent back to the power source (or the radio in this case). 
 +  * The ideal is 1:1 which is a perfect match.  
 +  * An SWR of 2:1 or higher (many built-in tuners seem to be able to do about 3:1) may cause problems for your radio. There could be many reasons for a high SWR and the book goes through that some.
  
 ===== Wrap Up ===== ===== Wrap Up =====
podcast/ddop/public/episode_201907.txt · Last modified: 2019/08/07 03:42 by mikewills