How to make simple RF CHOKE - home made project
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- čas přidán 5. 09. 2024
- This simple RF choke is my recent home made project. This choke I will use with my HEX BEAM antenna. It's very easy to build it. I hope you enjoy this video :)
- ferrite core: FT240-43
- coaxial cable: Helukabel RG58 www.conrad.sk/...
- cable gland: www.sos.sk/pro...
- ABS enclosure: KRADEX Z111H www.kradex.eu/...
- connectors: SO239 4-holes socket, PL259 for RG58
#RFchoke #HomeMade #HexBeam
Every type of coaxial cable has a specification list that includes the minimum bend radius. You must use a type of cable with a small enough minimum bend radius such that it will work with the thickness of the core you are using for the choke. If you exceed the minimum bend radius, you risk having the center conductor of the cable migrate through the soft dielectric and make contact with the inside of the braided shield, and shorting out the choke.
Great video Paul. Very helpful to see you build this choke.
As a retired electrician in Australia, that plastic thing is called a "cable gland" down here as others have also said.
As an additional note to that, the black cable glands are UV rated and fully weatherproof and won't deteriorate if outside in the sun for many years.
Thank you my friend.😊73
Hello Paul,
Your English is excellent, thank you.
The plastic 'thing' through which the RG58 passes is a gland.
Thank you for bringing us your great videos, I enjoy them enormously!
We used to call those "stuffing tubes."
And the tool that holds the parts together while you mark them up is called a clamp.
And you used cable ties to hold the chocolate block connector to the post.
When I made mine, I used 2 x SO-239 sockets, not a pigtail. I made a second one with N-Type sockets aswell. I also made one with SMA connectors for my SDR using an FT140-43. All work well.
For HF, VHF, UHF is it works? Maybe for uhf is less turns? What do you think?
Every ham should have this.
Paul beatifull garden un you José i love this garden Is big. And totaly green AND flowers congratulations for you new house.
Thank you so much! 😊😊
Well done Paul..
Thank you Larry 😊
Good video. You do nice work. The little plastic strips used to attach are called 'zip-ties.'
Great Video paul!..But you could have stuck the choke housing with builders caulk (the pink stuff)... solid stuff weatherproof too!
A real good test is to put a dummy load on 1 end and test SWR from the other. That way your soldering is tested and not causing you and antenna faults.
The purpose of the choke is to attenuate common mode current. But you never measured the choking impedance- so how do you know it is performing choking action?
Dale W4OP
Excellent work sir. I need this so Thank You!
Very good job, Paul!
I wish, I had got an hexbeam from Waldi, before he passed away...
Unfortunately, Waldi gone. It is still very nice product even after years on the roof... R.I.P Waldi
Very good job I enjoy watching so keep up the good work and I will keep watching your videos God bless
I taught type 43 were 25 to 300 Mhz and type 31 good for 1 - 300 Mhz.
nice job
Very nice job 👍
Thanks a lot 😊😊
Vďaka Pavel za inšpiráciu, de Imrich OM2WM
Your holder is called a "clamp."
The locking plastic strips are called "zip ties" or "wire ties."
The RF choke should be placed after or before the balun-tranformer? Tank you and congratulation for your project.73 de IU0PNM
After transformer. Antenna wire 》transformer 》RF choke 》coaxial feedline
It is called a Cap Gland in English.... Thanks for the video..
Yes, thank you 😉👍
The grey cable commonly called cable gland
Perfect! 😃 Thank you for correction 😉👍
hi...Paul, very clean work as usual... congratulations..how many total turns were there? and if possible plz do share the link for the Box of the balun...Tnx
Thank you very much! I think there is 18turns of the RG58 cable. All details are in the video description 😊
@@OM0ET ok thanx my friend 😊
Super video!
Is it ok to use RG8x instead of RG58?
Why did you make a RF Choke using this method, instead of using the multiple ferrite cores placed over the coaxial cable? Does it work better? Do the ferrite cores get too hot? 73
You could have made more turns around the torroid which would have made the choke more effective. I would have used an SO239 at both ends of the box. The silicon sealant should be installed during the installation of the fasteners and connectors. Silicon grease on the gasket helps it to seat better and help preserve the gasket material. Also to make it more watertight.
Mám taky takovou tlumivku, ale zjistil jsem, že např. signál na FT8 mi poklesne o 2S. A samozřejmě jsou i horší reporty. Taky jsem zkoušel volat SSB na kiwisdr a tam jsem se slyšel s tlumivkou mnohem slaběji. Nevím co dělám špatně. Vždyt navinout několik závitů není žádná věda. Mám RG58 a jádro FT240-43. Taky ti bere signál? Zkoušel si to?
You don't have to "hope that it would work because you can measure its inductance between the shield going in and out, then calcullate its reactance.....5000 ohms would be more than adequate, I think yours will be more.
Very nice work. I am lazy and buy my baluns from, Balun Designs, here in Texas but I am a firm believer in using a balun at a dipole, or hexbeam, fed with coax. 73 WA4QGA
i would use a compression fit SO239 (that may require a larger box).
Good Job! K7OSS 👍
Hello Paul, 😊Very good technical explanations, very effective and Evizente, and good execution, ask, are these loops, also with you, to purchase, do you have a 26 to 28 mhz loop also, a well-known one, would be interested, that's why mine Question, and asking doesn't cost anything, except for good advertising for you, I would be very happy to hear back, 73.55, have a nice evening 👌
Very valid points! I hope the Govt is listening. The courts have made this illogical rule of 10 years old ban in NCR. They're not subject matter experts. It's a flawed decision no doubt. There is nothing in a term year old car that has puc to create more pollution.
Very well put Saab! We need to spread this video far and wide.
Exellent !
Thank you 😊
Coax (any cable) has a minimum bend radius, once you go beyond the minimum bend radius, the coax will begin to fail. As the center conductor migrates it can short out, and the impedance will change at that point..
Right made toroidal transformer IT9CYK.
TNK FOR THE NICE VIDEO OM0ET
It's a cable gland in English
Good video , what happened to the 1 KV , 100 PF Cap across the connector? Thanks JohnBoyUtah KJ7TBR 😎🇺🇸📡🎙
It's a choke - Not an Unun
hi, why do not use the bothsides sticky tape on the toroid? woud be easier i think, cheers
It have to be durable and long term device to the extreme weather conditions 😉
Great job paul check it with your nano vna for common mode and differential currents 73 de IU5OFY
not sure how to do it on Nano Vana, can guide or is there any video on CZcams to demonstrate it...tnx
Thanks, but I don't have a Nano VNA. I have TinySpectrumscope only. 😊
@@Capt_Duffy to check the insertion loss for common mode currents (ideally it should be infinite)you put the central of ch0 with two resistance of 25 ohm to the two leads of a side of the balun and the central of ch1 with two resistance of 25 ohms to the other side of the balun,you bound the grounds of ch0 and ch1 togheter and you measure with s11 "logmag",remember to adjust the reading of 2db higher if you calibrate the nanovna normally.
To check differential mode insertion loss:(that ideally should be 0) connect the central of ch0 to one lead of a side of the balun and the ground of ch0 to the other lead and you do the same for the other side,there isn't a polarity
@@225fabry thanx alot brother for the detailed reply...!!!
@@Capt_Duffy it's nothing
rg316 is good cable for this balun? for qro 1 kw?
I was told that silicone rubber sealant should never be used on antenna connections or wiring, because the chemicals which are used to cure the rubber will oxidize the metal and lead to failure or poor connections. Is this not true?
Just make sure it non vinegar silicon.
@@M7XCB I have never seen that. I guess that is what is used in this video.....
@@M7XCB Yes - don't used Acid cure but use Natural cure
what is rf choke rg58 and one ft240-43 power rating?
Hi Paul. nice one. What is affected for SWR ?
I have SWR under 1.2 on all bands 😉
@@OM0ET Looks good, i will build one for my dipol antenna. But for more power i think i need use 2 core. Thanks, 73
Hey Paul, nice job. What are the hexbeam spreaders mare from?
That is a lot of turns you have put on there…..7 or 8 would be enough.
g-clamp
22:51 zip ties
Zzzzzzzzzzzzzzzz
What good is showing us to make it with out showing the results...waste of time....
Very nice work, Paul. Enjoy! 73 de wil n6bvz
Thank you very much! 😉
Now that is Fun! 73 de Leo k1zek k
Sell me that one 😂 , it’s look great . 73 WP4RC
Thank You for the information! Can I use this at 100 watts, 160 to 6 meters? I have a IC7300 and want to have something to cover all the bands that my IC7300 will do..160 may not be used much but may use it. de W4DES
great to work you QRP today on your refurbished hexbeam de EI2IJB, 73s
I thank you too! 😃 I tested this antenna right after tower erection. You were my first QSO 😊