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Calculating Power for Ham Radio - Power (Watts) and Ohms Law
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- เผยแพร่เมื่อ 18 ส.ค. 2024
- You can calculate your Power (Watts) easily. It's like a puzzle - and it's easy! Callum.
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Excellent explanation, and reverse checking is always a way to insure you have the correct answer. Nice job Callum.
Nice and easy :)
Hello this takes me back when I was studying for my amateur radio license but I learned it as e is voltage electromotive force I am now proud to say I sat the city and gilds and my radio call is G4DIP I used a slide rule my name is Barry James Chapman I'm also a keen CW operator and I love my hobby
I remember being taught sliderules!
Currently studying for my foundation exam. Your videos have been a tremendous help. Thanks Cal
Woo-Hoo. Great :)
This is what I love about the hobby. I passed my full license this year and this is the first time I’ve seen that simple equation used. I’ve always used the two formulas, didn’t know this one existed.. cheers Calum
Ah cool!
perfect just reminds me when i was doing my electrical course good few years back
Dear DX Commander. The info you provide is very interesting. Also for future Ham amateurs in other countries. The knowledge you need is about the same as ON3xxx in Belgium. 73's Carl ON3CLL
Thank you 👍
Well explained and therefore very simple to follow.
Thanks for sharing! You explain this well, and in better ways than I learned!
Great to hear!
Thank you very much for making this simple and understandable!
You're very welcome!
Thanks for the video, great walk through of the 'basics' that we tend to forget when we don't do it everyday.
You bet!
Seems like a complicated way to try to remember something simple. Just remember PIE. P (power) over I (current) times E (voltage). Two fundamental formulas, E over IR and P over IE. In electronics "E" is used to represent voltage with E being short for Electromotive Force which is measured in Volts (V).
Not everyone learns the same way, this method is easier for a right brained person like myself.
Erm OK!
Back in the day I was taught 'Watt Are Virgins. Virgins Are Rare' I've never forgotten that.
I have another variant of that theme
When I was a Prentice C**T or PC for short as we were all called in those days "apprentice mechanic"
My lecturer said just remember Virgins are Randy and remember I have to the point I cant permanently remember other triangles and formulas
Cal you are so great at explain stuff in words that anyone should understand, thank you
I appreciate that!
Excellent, much appreciated
Great Information brought back to my training. You ought to do the entire Foundation series!
That's the plan!
fantastic start.. im hoping to get my licence soon and hopefully catch you on the waves
Best of luck! Fabulous. Keep us posted :)
I knew the formula, but your video helped me understand it in a way that is now usable data.
Brilliant!
Just like magic. Been SO many Years since I have had to think about this 🙂Simples!
Thank you very much sir for the excellent explaining
So nice of you
Ohms law clearly explained Thank you
You're welcome! Thank you.
Wonderful explanation.
Glad you liked it
This is THE BEST, THE SIMPLEST explanation that I have ever seen. Thank you!
Great!
From one adhd mind to another visual learning like this is how I live life I failed first foundation coz it wouldn't stick in my head , these videos and from dx mk1 page helped pass now 18 month in and loving amature
Lovely.
These little videos you are doing now are a lot clearer than what you did before. It is bound to help those new to it all. Shame you didn't choose to work from one end of the book to the other. It would certainly help people new to it all. 🤔 😎👌👍👀
So far I have actually worked through each page.. We'll see. I'm even busier now than I was back then!
@@DXCommanderHQ I do understand that, but new Amateurs need aerials! 😜
Just a reminder that many Radio/Television Engineers, as I am, do not know this since they got their license by memorization and not by actually learning Engineering. Lol I have education to back up my US FCC license. RF is fun.
Yeah.. We have no ability to "memorise" here in UK. Questions are not published.
Great video. Hard to get used to the v though. I learned E for voltage. Then the I, R. Stateside.
Great brining it back to the basics!
I only wish somebody had taught me that way 60years ago. I have always had to do it in two calculations as formulae were different.❤
You and me both!
this is great! thank you
You're very welcome!
Excellent!
Many thanks!
Thank you Calum 👍 much appreciated !!
No worries!
10 out of 10 sir!
Great!
Great info cal keep up the great work
Vir and piv are the 2 triangles you need
One of the few things I remember being taught at school was imagine a young lady called Ivy Watts - IxV=W
HAHA!
good to refresh the old brain muscles
Back here on the other side of the Atlantic is there any way to order the training manual either physically or digitally? Really appreciate your clear and concise videos. Fills in the blanks I have in my memory from my 10th grade electronics class many many moons ago. 🙂
I don’t know. Drop RSgB a note and ask..?
Hey Cal, in the antenna modeling software you're always using, how do you model things like Un-Uns, Bal-Uns, loading coils and traps? Also how do you model large solid antenna elements such as one would see on antennas like dishes, discones, etc.?
Transformers (ie 4:1 baluns) can be modelled. So can coils. Unsure of traps. How do you do that? There will eventually be a video out on that.. Just not today (although I did cover the 4:1 balun when I modelled the loop)
Excellent presentation. You have me hooked to study for a new hobby. Just about to order the book But as an OAP on a budget what would consider to be a good entry point transceiver?
That topic is big because everyone has an opinion.. If it were me, for my HF set in the "shack" (as we call it) I would vote with my budget / wallet. I would call Tony or one of the sales guy at Martin Lynch and quiz them what comes up and what might be nice for a budget of X. I would also try and contact some local clubs, explain you are getting into the hobby and does anyone have an old working radio they could either lend you - or sell to you at a half decent price. Many folkls have a few radios they never use.. All they need is a prompt to do something about it. I'm talking HF still.. There are many commercial wire antennas out there but hang opn before you do anything with antenna.. See if you can squash in 2 x 10m long (33 feet) wires wiggled around the garden connected to a piece of coax (rudimentary connection is fine) and get yourself on 40m band. That will also tune (for transmit) on the 15m band but you will be able to listen everywhere. Everyone's situation and "back yard" is unique.. Keep watching the chanel - and perhaps cruise back through my videos - I make a lot of wire antenna videos..!
Wav files play music. In radio music WAV is Watts = Amps times Volts.
I’ve obviously missed something, or will you tell me in a later video I.e. why do I need to know how many ohms there is? Great vids.
You don't really other than the fact that sometimes it's handy to know. Mostly, you can ignore it. UNLESS you have an exam coming up and you need an extra point.
A+
So the question is that, how does Ohms law relate to amateur radio in the practical sense?, I can understand in the automotive electrical world where a load is consuming more current because of internal resistance at a given voltage one could diagnose a fault.
It's the building block for anything electrical or electronics.. That's the only reason.
Hi there commander I have a learn disability and I’m starting out on a cb and what would be the best thing to learn about the cab as I just want to learn how it works first
Oh wow. Welcome my friend.. Such a big topic.. Firstly, I also had terrible learning issues due to my AUtism and ADHD.. But by being totally obsessed with this hobby, I got a grip of it all. You can try a websdr to have a listen - or maybe KiwiSDR (use Google). Find a receiver close by you, click on it and maybe listen to both 7.15Mhz (or near that) and also 14.250 (or near that). They are popular ham bands. Also maybe listen to my livestreams on Fridays at 12:00 UTC (currently London time but that will be 13:00 soon after and March when clocks change). Where else to start? By listening I think! Keep in touch and feel free to comment on any video. I read all comments. Kind Callum Regards, .
great explanation of the maths. How does this apply practically? I have a radio supplied by 12.8V, It uses about 2.5 amps while transmitting and a coax run that has an R value of 50ohms. This kind of explanation would help me understand how this works in the real world of free space and obstructions rather than the engineer's pristine realm of gridline paper.
Presentation Score: 6.5/10
keep up the good work!
I'll take the 6.5 :)
Callen, seems in the UK, you are using abbreviations based on the first letter of the word
Here, across the pond, it seems we are using more engineering letters for the values.
When studying for my Tech, which is our intro level license in the US, I did have an issue. In HS, we used the letters you used. But the FCC test uses PIE.....That I had to study carefully.
But I can borrow your triangle concept to diagram the formulas using our letters....
You have to remember that in USA, you are not fully SI units.. Maybe that's the problem. Like feet and metres..
E=V. E stands for EMF, or electromotive force. Same as Voltage.
10/10
Top Man
👍
I know how to solve ut but i need to know what this is for. The most valuable part is missing
Read the comments and the title.. The clue is there.
@DXCommanderHQ again what is it for other than calculations. Put it in real-world application. What does that mean in Ham radio
@DXCommanderHQ i realize it's unreasonable request it's just my curiosity is peak regarding ohms law but i cannot in vision it in real world applications
i did 2 triangles PIE and EIR "pie" and "ear" were my mnemonics!
But I would struggle to remember how to spell mnemonics!
@@DXCommanderHQ oh that's easy. It's mneomo, er uh mnumen. Ho crap. You're right.
10/10 😁 73's
You could have add the full two fe of equations P=I.R or P=V^2.R or P=I^2.R where you can substitute for I in the first equation the expression V/R and then because it’s a common denominator it becomes V^2/R and so on for the I^2.R variant.
This *is* Foundation - aimed at people who have never seen anything like this in their life..
8/10
HAHA Thanks!
My Brain Hurts
You should be in mine!
you didn't help, I'm still confused
You need to pinch yourself.. Volts multiplied by Amps = Watts. Watch previous vcideo - or check the comments because you appear to be the odd one out and there is no way of simplifying this other than giving you a 1-2-1 session, which I can do. But you would have to book it.
Thanks Callum for the tid bits always good stuff de W9US
Any time!
Good to re member of the day I took the RAE . with OHMS LAW 73 de G6JMX.Good Videos as all ways Callum TNX
Tnx Barry!