Triode CW Transmitter, Design, build and QSO

I design, build and have a QSO on an RS237 Triode Ham Radio Transmitter.

[@vacuumfireradio253]

I love the way you started drawing the circuit...in the nicest way possible ...by drawing the heart of the machine...the valve. It does not feel the same when drawing an integrated circuit or FET.

[@alevans51]

Nice cache of parts. I can see you are well inspired to build.

[@kayyouaretee5329]

One can hardly make a more simple transmitter. Excellent ! I think I spotted a Siemens "Rainbow receiver" in your collection..... Greetings from Denmark.

[@acestudioscouk-Ace-G0ACE]

Thanks for making this video. I like the glow given by valves and it's a good idea to have a clear panel to see the tube light up. It looks good as well as works well too!

[@lorksmoot4937]

I agree with the idea that fine and historically interesting components should be openly visible in new setups like this. As I watched this, I was truly inspired by the elegance of this work. Outstanding!

[@Valvulo]

These modules with the SI5351 and others are small and work really great! I like the combination with the RS237 too, it's a beautiful tube. Great work!

[@vincei4252]

This is very cool. I did wonder about the power dissipation on the tube then you mentioned needing to put in a fan. I'm jealous of all your vintage tubes. I suspect they will outlive a lot of modern contemporary electronics. Your Kenwood oscilloscope is super cool too!

[@LA6NCA]

Yes heat became an issue. I work like this. Builds and tests. Then I correct to solve the problem. Not easy to calculate everything in advance. Thanks for your nice comments.

[@lorksmoot4937]

Very interesting, as usual! I especially enjoy the use of the Telefunken component in the design of your creation. Thank you for sharing this!

[@borisj4054]

Good to see real home built equipment. So many just buy commercial stuff where the satisfaction is short lived.

[@NielsEHolm]

Good video - as usual! Wonderful to see a mix of new and old equipment. Best 73 de OZ7NQ, Niels

[@khaleedan]

❤❤❤❤❤ good job man it look so hard to understand but im totally astonishing by how its 😮 complicated and difficult to make a radio signal

[@kcscarecrow]

Very nice work Helge. It is a shadow box transmitter. Very cool.

[@understandthetimes5721]

Wonderful design and construction! You have a nice collection of spare parts! 73

[@LA6NCA]

Thanks for the nice comment. I will make a video about my components later. Have a lot.

[@hansibull]

Fantastic video as usual Helge. I just love the clip from 11:20! We have a Nixie tube-based counter, an analog oscilloscope, and they're both showing morse code. Beauty!

[@DavidJamesTaylorCruising]

Thank you for posting.I always find your videos very interesting. Regards from the UK, David G8APW

[@vacuumfireradio253]

Excellent work Helge...I like the use of the perspex.

[@SpinStar1956]

Very FB XMTR! Nice construction! 73 from USA...

[@ronlanway6667]

Excellent work!! I wondered about the heat but a fan in the back doesn’t take away from the look and was pretty quiet! Nice job!!

[@kroghsmachineshop4708]

Really interesting, enjoyed it, I was waiting for you to call LA8PV, just kidding, 73 from Denmark😊

[@OldFoxRadioCompany]

Excellent work, nice to see and hear this RS237 unique project, of course together with the ufb E52 receiver ! 73 de Jos,ON6WJ

[@LA6NCA]

I think this was a fun project. And the E52b is a very good receiver. I will make a video about it later.

[@radiorider8249]

Very nice project, congratulations, that's real ham radio. 73 Denis F6CRP

[@AntonioSilva-kr9nw]

I am a brasilian ham py4evj. Great videos. 73s.

[@tunercars3]

im glad this has subtitles and its a great video nice set up

[@richardkice2113]

hi Helge ! this video is very inspiring / thank you for sharing . . . you mention just very briefly that you experimented in order to get the proper coil windings for the output impedance. I would like to know more details about that ! Kindly regards / Richard / KC8YTV

[@LA6NCA]

Thank you for watching my video. I made different coils with different windings and diameters. Then I measured how much power I got out of them. Then I chose the best one. If I made three coils with 6, 8 and 10 turns and the one with 10 is the best, then I will also test with 12. Simple, requires no calculations, only measurement.

[@richardkice2113]

@@LA6NCA fine biz ! Also, when you were testing the variable capacitor for output coupling, did you have the full amplification or just output from oscillator ? Same question for when you were testing output power for the different load coils . . . ?

[@panosdel5709]

very nice and compact construction

[@sincerelyyours7538]

Fantastic! You make it look so easy. I like your style of writing down a basic schematic first, then figuring out the details later through experimentation. I really liked the hand-wound coil trick to adjust output impedance. Very clever! I never saw a vacuum choke before. Is there a reason for the vacuum? Also, thank you for the clear English translation. I will be looking at more of your videos! 73 KD2ORG.

[@LA6NCA]

"I like your style of writing down a basic schematic first, then figuring out the details later through experimentation." Yes, that's always the way I work. I rarely calculate the details, I do experiments to find the best way to design a product. "I really liked the hand-wound coil trick to adjust output impedance. " This worked very well. One can easily adjust the values of the coils. "I never saw a vacuum choke before." Vacuum choke is very rare. But it can withstand very high AC voltages. ie high power. Almost all my viewers can understand English. Thank you for watching my channel.

[@joeblow8593]

Nice work on the transmitter!

[@douglasdunn7267]

Very NIce Helge, thanks for the show. Really enjoyed your project. I love to home brew here, just no time to do it. Take care! DE K7YD

[@SeAfasia]

nice constraction..old parts and new parts thanks for share..73

[@didierstarkeundehre4027]

beautiful beautiful work!!

[@LibertyLakeWildlife]

Nicely done!

[@UpinkProduction]

I love it good Keep uploading videos like this 👍

[@IvanPassos]

Excelent transmitter

[@vacuumfireradio253]

Wow...I've never seen a vacuum choke before...

[@michaelmiller641]

Well done!

[@ЮрийКривощёков-ш3ж]

Gut!

[@joed2392]

Awesome build !! And it keeps the shack/room, warm during winter too ! By the way, how many watts did you achieve on the output?

[@LA6NCA]

Thanks for the comment. I only got 5 watts. I did not have neutralization, so that's how it turned out. But it works very well.

[@tim46767]

beautiful! I like the mix of old and new tech. In the schematic is an input of 30V peak to peak. Is it from the si5351 module? What module is it? And do you need no output low pass filter? I ask because the output of a si5351 is a square wave.

[@LA6NCA]

The output of SI5351 goes into a transistor with a drossel connected to 12V. I get a gain of the square pulses. Then the signal goes into an L-C resonant circuit and I get the sine wave at even higher voltage.

[@didiafandy]

Nice TX with triode tube,GL 73....de YDØNVU

[@johntheglass]

Great work this is one of my retirement projects. M0hfh

[@LA6NCA]

I'm already retired, so I can work on radios all the time.

[@haramanggapuja]

Så mange gamle radioer ;-) 73 de W8IJN

[@EC5ABG]

Realmente gran trabajo. 73. De ea5hyw Toni.

[@ra6m2]

!!!! Best 73

[@SA2CLC]

Snyggt bygge Helge. Gillar din lösning med antennspolen. Har faktiskt gjort en triodsändare jag med, helt 3d printad. Har dock inte filmat den än, men det kommer //Tommy, SA2CLC

[@LA6NCA]

Tack för din kommentar. Jag har tittat på din KZbin-kanal. Har prenumererat nu. Mycket intressant där. 3D-tryckt triosändare kommer att vara intressant att titta på.

[@vancouverman4313]

Helge: Jeg hadde to onkler som var i den norske motstandsbevegelsen i WW2. Kjenner du til et historisk samfunn eller en organisasjon i Norge som kan gi meg informasjon om dem og hva de gjorde under krigen?

[@pepsodentpasta]

Did you make a buffer stage between dds and rs237 tube instead of direct coupling on the schematic ?

[@heinz-jurgenhemp8473]

👍👍👍❤️❤️❤️

[@mauricewilkes826]

Very nice work! What is the output power of this tx?

[@LA6NCA]

I wanted to make a QRP transmitter. Power output is 5 Watts. It's because I have no neutralization. I will build this in later. I can then increase power out. But with 5 Watt CW you get far.

[@kittony71]

nice work what's the power output from rs237 triode

[@LA6NCA]

I wanted to make a QRP transmitter. Power output is 5 Watts. It's because I have no neutralization. I will build this in later. I can then increase power out. But with 5 Watt CW you get far.

[@kittony71]

@@LA6NCA THATS GREAT but the tube is so expensive on eBay what was the price for the one u av

[@LA6NCA]

This tube is one of the world's best tubes for high end audio. Therefore the price. I got this tube from him I communicated with in the video. Many other tubes can be used for this design.

[@kittony71]

@@LA6NCA thanks am in africa kenya where everything is hard to get for now am using solid-state transistors and mosfet like irf510 and irfp450 i like what you do sir great hoppy

[@ruphusbau3721]

hi are there any other triodes i can use? the ones he shows are beautifull but i dont have 3000£

[@vincei4252]

Helge, can you please share ebay details of the B+ tube power supply you purchased on eBay?

[@LA6NCA]

Try searching on ebay for this: DC 12V-24V Step up to 200V-450V DC-DC

[@vincei4252]

@@LA6NCA Found it. Thank you!

[@ярославзаблоцкий-и2м]

Хороший радиобомен ...

[@JxH]

FB OM, 73.