Basic VHF and UHF Fundamentals

Basic VHF and UHF Fundamentals
Antennas are a very important component of communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, into an electromagnetic wave in free space. Antennas demonstrate a property known as reciprocity, which means that an antenna will maintain the same characteristics regardless if it is transmitting or receiving. Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. An antenna must be tuned to the same frequency band of the radio system to which it is connected, otherwise the reception and the transmission will be impaired. When a signal is fed into an antenna, the antenna will emit radiation distributed in space in a certain way. A graphical representation of the relative distribution of the radiated power in space is called a radiation pattern.

[drankurbaruah]

When a YouTuber doesn't bullshit, puts 2 hours of reading into 5 mins of clear, concise awesomeness, videos like this happen.

Much respect and thanks, Sir.
I just cleared my general grade in India. Waiting for my license.

Love and regards from India.
73

[dnr]

There isn't one piece of fluff in this video, the information is like reading notes taken from a two hour lecture.... great job

[swarfegakid]

Simplicity at its finest, why can't all videos be like this

[msmith]

Pro-tip, playback at 0.75x speed to have a drunk sounding guy doing the voiceover. Informative and entertaining at the same time!

[LibertyEver]

This was one of the best YouTube videos I've ever seen. The information with presented quickly and concisely with good visual aids. I can't believe people complain about someone speaking too quickly. I'm from the south and I still thought this was great. :-) if you want to listen slower simply tell YouTube to play the video at a slower speed. The rest of us can keep up just fine. Most videos lag and have a bunch of nonsense filler time wasting garbage. Kudos for the concise presentation that did not waste my time. I'm forwarding this to some friends who are aspiring to be ham radio operators.

[mtaur]

Dan Vanevenhoven: Dude, you just answered a bunch of questions I had on this subject in a clear, concise manner. Thank you! Thank you! Thank you!

[EngineerDJ_Julius]

When entertainment doesn't do it for you anymore, and you find pleasure in video lessons and courses

[AussieMaleTuber]

Thank you very much (from the ACT in Australia)!

[true]

can a tv antenna be use for transmitting a radio signal to receivers

[_Breakdown]

1:15 - - VHF + UHF uses line-of-sight propagation.
Line-of-sight is the direct propagation of radio waves between antennas that are visible to each other (the most common of radio propagation modes).
1:37 - - *maximum distance of line-of-site transmissions is about 25 miles* (due to curvature of earth; referred to as the radio horizon); slightly farther than actual sight bc radio waves bend; *however the higher the frequency - the less they bend.* *You can extend the range of your communications on VHF + higher frequencies by increasing the antenna height - 10 ft of antenna height is like doubling your power output*

[jimmatrix]

Thank you very much for this information. Presentation is lively and never felt sleepy.

[blakemartin]

A small, mostly irrelevant note:

I wasn't sure if the concept of simplex and half/full duplex were the same as those used in digital systems communications, but it seems they are after some research.

The walkie-talkie example was labeled as being simplex in this video, but I believe this would more accurately be considered half-duplex, since the communication is bi-directional but transmit and receive cannot be performed simultaneously.

The example of using separate frequencies for transmit and receive to achieve concurrent transmission and reception would then be full-duplex.

Anyway, great content thank you for the video!

[JonMcG]

Fantastic Job, Wish everyone doing tutorials on YouTube followed the same method you do, I could learn lots

[bell]

Did Mr. Plinkett and Scientist Man merge together?

[GeorgiaHistory]

Thank you for this video. It is the most informative one I've found on YouTube! Again, from someone just getting into HAM and VHF/UHF this was extremely helpful!

[byurBUDdy]

Ever ask about how cars work and get an explanation about the highway system?

[mervynsands]

Spot on and nice presentation.
good luck to everyone in your two way radio excursions. Have fun.

[johndandreasr.]

Very well done! This should many new hams.
AA5JD, John

[Enderbro]

Quick question, isnt that duplex referred to as half duplex? Because those transceivers can only send or receive, not both at any given time. Full duplex you'd be able to listen while you talk, right?

[mattharvey]

a friend of a broadcast station he used the moon as