RF Amplifier Building Concepts For Beginners - INDUCTORS
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- Gatekeeper In Amp Building Concepts - The 5 Building Blocks of RF Amplifiers
This is a series of videos that I am personally making for a very good friend of mine that I am personally teaching & taking under my wing. I want to get him up to date on building and repairing RF amplifiers as quick as possible. If this makes it out to the public I hope that you get some enjoyment and satisfaction out of the knowledge I present here.
This wasn't planned at all. All of this is freestyle & was made for the person that has no knowledge at all of electronic components but if you do, you may get something from this anyway.
Let me know in the comments if you would like to see more videos of this nature.
⁉️ Please Read Below 👇
Has Gatekeeper in any way helped you, gave you inspiration, helped you pass by time while waiting on your kids in-line at school or at those long lines at Mc Donald's 😅? Then buy ole Gatekeeper a Coffee:
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Good brain pick video ✌🏼
I gotta catch from beginning 🤔
Enjoy check description to enjoy
You sir have really help me understand more about the flow of RF, and general electrical theory! Keep doing what you do. God Bless, 73
You are very very welcome!
😎
Thanks for stopping by
Just sitting back getting schooled by GK. Very informative my friend 73
I know most of this is refresher for you but ya never know man you may get a tiny piece of the puzzle you didn't have lol. ....keep on coming by and commenting....commenting like this helps me, giving thumbs up does to, it helps youtube place my videos in suggested spots more. So everytime someone does these things I really appreciate it. Also share these on your Facebook if your able to or via text message to your friends. You all are the ones that help me get these videos out. Thanks a million!
Thank you GATE KEEPER, You are the man ! ! ! Keep this AMP. school going. Your experience and knowledge is greatly appreciated. Thank you for passing on what you were taught by your colleague. There are alot of us out here that would have liked to have been in your shoes learning the best of amplifier techniques and skills. It really helps us to be able to address problems with our own equipment. We all probably know that we will not utilize this information to actually make money, but just info. to get our own equipment going properly. Your guidance is and will be key to future repairs. Thanks again GATE KEEPER. Keep up the great teaching videos. Love it !
Thank you very much buddy...it means a lot to me to see that I have helped anyone in any way possible. Please feel free if I ever help you save money by doing something your self, check out my description and buy ole GK a cup of coffee ☕ on the link...Im using everyrhing I receive to enhance my videos and to make more videos for everyone.
Enjoyed thank you 💯❤
Very welcome bud!
Hi, I'm not an RF person, just learning RF at the moment, so great introduction to how RF transformers and chokes are used in power amplifiers. I've just been looking at Baluns and RF chokes for the matching of the feedline to the antenna and to the radio, so fantastic learning in this session. Thank you so much 73's Bob
Indeed, I plan on covering this stuff to bud. I made a real neat 49:1 Un Un for a half wave end fed dipole that turned out insanely good made out of crappy wire, plastic box, little bit of stainless hard ware and a 61 core ferrite choke. It was a really cool impedance transformation project. RF is one huge impedance transformation GAME! - Gatekeeper
So how are you determining the transistor input and output impedance? How are you calculating the turn ratio on the transformers to match the input and output impedance of the transistors?
Your getting into a whole separate lesson right there bud lol 😆 which I am going to be making a video on soon. That is getting into Smith chart and imaginary j part etc.... luckily when starting to build these type of amps you already have a good template to start with. Good ? Bud.... one more thing...having a data sheet is a big plus when trying to figure out all of this.
@@1883GotDown Thanks for the quick reply I keep an eye out for your video or videos on this topic.
oops on the impedance transformers....knew youd catch it before the vid was over
Lol lol I make little mistakes like that all the time...reminds me that I'm a human and a dumb a at times lol lol keeps me humble!
Trying to figure out what you meant by impedance transformers? What did I make a mistake on and correct by the end of the video? Help me out brothe :)
@@1883GotDown i may have it wrong. lol. ive always thought of the input transformer as a stepdown transformer i e. 50 ohms to a much lower impedance. the output is a step up transformer i.e a much lower impedance stepped back up to 50 ohms.
@@rocknrolljesus3197 Hey bud this is GK on my personal YT...that is correct...your stepping down from 50 to the bjt input impedance...yeh I got it backwards low z and high z on the paper in the video lol lol..I need to add that on screen. But your correct! It really gets fun when you get into tunning multiple 50ohm signals down to lets say 12.5ohms then needing to go back to 50. Or 4000 ohms down to 50.....crazy stuff.
Mr Gatekeeper, you explain this stuff so well and get into more detail than I have seen a lot of other videos on this stuff and you make it easy to understand and you are a down to earth guy !! Thank you so much for what you do to electronics and the RF world and I love the detail you go through ! :) 73's
So the HG Transistors like the type 61 transformer
That is what I roll with.
Really missed you stay in touch
Thanks Stan.....make sure to watch more of my recent videos when you get a chance.
Why is copper wire winding wire not used? understand the primary but why doesn't anyone use coded copper wire for the secondary windings?
Does the size of the wire matter?? On the transformer?
I think your asking why do we not use copper wire as the primary 🤔 main reason is be sure it is easier to use and manufacture them by using copper board and brass tube. Is that what you were asking?
Pause for the cause!
14:02 Love it man! Never heard that one. Thanks for sharing this great info man.
Hey what are your thoughts on calculated half wave length jumpers from radio to amp to meters etc?
Very very good question. Velocity Factor is what I am going to be making a video on soon. This is an important thing. I'll tell you this...all my coax jumpers on my bench are cut for the exact VP so my bench is perfect for tuning. It is good to have different length jumpers cut for thr different lengths of its VP. Sometimes a box may like one length better then another. In the end what counts is have you got all the SWR that your able to get out...out. that is the most important ?
this is probably a dumb question but I am gonna ask anyway...... So what about amps where the primary and secondary transformers are not in a perfect row with each other??? like I have a texas star one pill where they don't even face each other. I have seen some bigger amps where they are in line but slightly offset. I am new to this but my guess is that they are tuned different. Thank you so much for posting this stuff man. I have wanted to understand how linear amps work for a while and it all just seemed like voodoo magic until now.
That is a good question bud...well you gotta think about it like this...that Texas star is two seperate amps.... Two 2 Transistor sections.....they can be 10 ft apart along as they are combined right. Along as the 2 transistors in each section are close to each other because the emitters share electrons with each other being a push pull configuration. If they were further apart it would effect them.
It is unique how one of the wires are longer going to the splitter isn't it....but it works lol. It helps because it is straight wire....if it was coax in different lengths this could cause a problem.
I learned very much from this video. Very helpful on this section. Now I'm ready for understanding relays and biasing. 73's Gatekeeper keep up the good work 👏
Biasing is coming buddy, made a simple video for that already also.....
....keep on coming by and commenting....commenting like this helps me, giving thumbs up does to, it helps youtube place my videos in suggested spots more. So everytime someone does these things I really appreciate it. Also share these on your Facebook if your able to or via text message to your friends. You all are the ones that help me get these videos out. Thanks a million!
@@1883GotDown no problem I always hit like button and subscribe to your TH-cam channel 585 coast of the Magnolia waving 73's
I think that artillery become more of soft target interceptor making more place for Loitering munitions. Drones are much cheaper and more capable to precise eliminate single valuable targets far beyond control range...
But this is fascinating how many possibilities lies in the artillery shells 🔥
No offense but what does this have to do with my video?
@@1883GotDown hahaha hah 🤣🤣🤣 i just realize I have some kind of a bug on my YTApp. I was writing comment when video switched and this happened XD sooorrry
You are free to delete this komment XD
He has the transformer drawn backwards. The low side (the copper tubes) drive the transistors (one turn).
You are correct thanks Joy of doing things on the fly lol.... yep the 1 wrap always hooks to the pills.
learn as I'm fixing amps!
I have hear about people putting ferrite bead on there coax cable
Yep you can have what is called common mode currently that will travel down the shield of your coax. That helps with that.
I didn't know that
@@jeremyshiver6055 stick with me and you'll learn something.
@@jeremyshiver6055
Yep, stops the common mode. One can also try to make a "choke" from winding their coax in loops nicely packed. About 7 to 8 inch round in about 5 to 7 rotations to aid in the same.
Both help with any feed back going back down the feed line and causing rf issues in the shack or radio.
Ground ground ground and more ground is always a good key too
If building an amp ICA sells type 61 and 67 transformers. Do they require different capacitors when u build with the two types?
Very Possible. When you change transformers the Q of the process changes. I personally have found 61 to be the perfect medium when it comes to saturation and heating. 67 is good to use if your building for example a 6m amp.
@@1883GotDown what cap should u use on a 61 input transformer 330 or 390pf?
My 8pill Fatboy has 390 on em I want to add a 2 pill driver internally to it. Trying to Copy the circuit. Not sure which transformer/cap combo to use on the input.
Very good video a lot to learn thanks
gk would you be willing to train someone how to build amps. if they came to you for a week.
Mega is million....
Agreed
Awesome lessons good teacher
Just shaking the camera makes me drunk, awful.
Sorry about that
@@1883GotDown Yes, I know, making videos is not as simple as I would think. Thanks for explaining the practical side of building RF amps.😑
Love the video keep them coming
I appreciate the explanations GK......... always good times watching your videos. Keep up the good work as always!!
Mr. NOBODY NOBODY GOOD TO SEE YOU MAN! Thanks for the kind words....keep on coming by and commenting....commenting like this helps me, giving thumbs up does to, it helps youtube place my videos in suggested spots more. So everytime someone does these things I really appreciate it. Also share these on your Facebook if your able to or via text message to your friends. You all are the ones that help me get these videos out. Thanks a million!
@@1883GotDown
No problem brother. Yes, I surely am sharing it out..... not only for the content of somone to learn on things they ask about but to bump your algorithm. Again, keep up the good work, the words are what they are reflecting the content!!
Thank u
No no thank you sir ....keep on coming by and commenting....commenting like this helps me, giving thumbs up does to, it helps youtube place my videos in suggested spots more. So everytime someone does these things I really appreciate it. Also share these on your Facebook if your able to or via text message to your friends. You all are the ones that help me get these videos out. Thanks a million!
i would love to come down there and learn from you.
Excellent video TNX
and get payed for doing it.
Hay , before you left the air for a while you needed 4-40 hex hex screws. did you find were to get some ?
NEVER BROTHER....id have to spend hundreds or thousands of dollars to get them custom made.... they were 4-40 Self Taping Hex Screws that I said would be sweeeeeet if I could find. MANY TRIED but no one succeeded. Thanks for stopping by bud.
would love to get into this I've been doing the basics but i want to get in to diagnosis.
Awesome video gate keeper 👏 👍
Thank you very much
A foot apart
Or an inch close :)