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If you are studying for your Technician license I would suggest picking up the ARRL Technician License study guide. It is pretty good and also contains the entire question pool for the exam.
You will find a good amount of information in that guide alone on explaining how signals are...
Not long ago I purchased an HTX-100 from ebay. There is no problem with the unit, but I have a few friends who like to play on 20m so I've decided to sell this unit and get a multiband radio.
Everything is in perfect working order. I have not used the CW setting on it for anything other...
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