Sunday, July 18, 2010

Lesson 32: Technician Class Exam Prep T9B

Hello again!  This is lesson 32 which covers the T9B section of the exam question pool and feedlines.  Unless you are already familiar with radio communications, feedlines may come across as a bit obscure.  There are some common themes.  For instance: you always want to make sure your feedline impedance matches your transmitter's output impedance; coaxial cable is the most commonly used type of feedline even though it may not be the best performer; and never let moisture get into coax.  There are few other items you will want to memorize.

-The most commonly used feedline impedance is 50 ohms.
-Type N feedline connectors are best for UHF.
-PL-259 feedline connectors are best for HF.
-The feedline with the lowest loss at VHF and UHF frequencies is air-insulated hard line.

Until lesson 33...

73,
Andy
KE4GKP


4 comments:

  1. WHY DO YOU ALWAYS SAY 73 MR. ANDY?

    ReplyDelete
  2. Andy is FANTASTIC, I found this on YOU TUBE, I have been a HAM TECH. for 15 years now I am going to upgrade to GENERAL CLASS, With the Manual and the WHISPERER ANDY , How can I miss ! Great job Andy !! Thanks for the help !

    ReplyDelete
  3. 73 is best regards or best wishes in Ham speak.

    88 is hugs and kisses.

    ReplyDelete
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