{"id":453,"date":"2019-01-23T13:41:31","date_gmt":"2019-01-23T12:41:31","guid":{"rendered":"https:\/\/pi4zlb.vrza.nl\/wp\/?p=453"},"modified":"2019-01-23T13:41:58","modified_gmt":"2019-01-23T12:41:58","slug":"understanding-modulated-rf-with-w2aew","status":"publish","type":"post","link":"https:\/\/pi4zlb.vrza.nl\/wp\/2019\/01\/23\/understanding-modulated-rf-with-w2aew\/","title":{"rendered":"Understanding Modulated RF With [W2AEW]"},"content":{"rendered":"\n
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There was a time \u2014 not long ago \u2014 when radio and even wired \ncommunications depended solely upon Morse code with OOK (on off keying).\n Modulating RF signals led to practical commercial radio stations and \neven modern cell phones. Although there are many ways to modulate an RF \ncarrier with voice AM or amplitude modulation is the oldest method. A recent video<\/a>\n from [W2AEW] shows how this works and also how AM can be made more \nefficient by stripping the carrier and one sideband using SSB or single \nsideband modulation. You can see the video, below.<\/p>\n\n\n\n

As is typical of a [W2AEW] video, there\u2019s more than just theory. An \nIcom transmitter provides signals in the 40 meter band to demonstrate \nthe real world case. There\u2019s discussion about how to measure peak \nenvelope power (PEP) and comparison to average power and other \nmeasurements, as well.<\/p>\n\n\n\n

Although the examples use a ham radio band, the concepts will apply \nto any radio frequency from DC to light. If you want to do similar \nmeasurements, you\u2019d need a scope, a peak-reading watt meter, and a dummy\n load along with the transmitter.<\/p>\n\n\n\n

We enjoyed that he uses a scope probe as a pointer, but we can\u2019t really explain why. If you are ambitious, you can build your own SSB transceiver<\/a>. Another common way to modulate RF is FM<\/a> and we\u2019ve talked about it before, too.<\/p>\n\n\n\n