HOMEBREW QRP TUBE CW TRANSMITTER FOR 80 METER

[@wa4aos]

Thanks for the English captions !! Nice project !

[@N6QW]

FB OM. Superb Build. The 12A6 was the audio output tube used in the WWII ARC-5 Receivers. A great tube for a QRP Transmitter. 73's Pete N6QW

[@Steve-GM0HUU]

Veldig hyggelig Helge. Noen gode ideer der. Takk for at du delte. Very nice Helge. Some good ideas there. Thank you for sharing.

[@TheArtofEngineering]

Du er et geni! Elsker denne blandingen av gammel og ny teknologi. Min nåværende konstruksjon er min første rørrigg. Hart 25 fra 1955. Jeg bygger 40m-versjonen.... Så langt går det ikke bra :) Jeg kan prøve 12A6 sparer å rote rundt med å konvertere DC til varmeovner. TU for alle disse flotte tingene 73 dit dit You sir are a genius! Love this mix of old and new tech. My present build is my first tube rig. The Hart 25 from 1955. I'm building the 40m version....so far not going well :) I might try the 12A6 saves mucking around with converting DC for heaters. TU fer all this great stuff 73

[@LA6NCA]

Thank you for the nice message. :-)

[@sophoklesgreek3237]

Helge.... that is an piece of art.

[@FranciscoGonzalez-gl7qo]

Helge como siempre me sorprendes . Felicitaciones 73s desde Chile. CA 5 FGI.

[@bundylovess]

Awesome job mate big thumb up

[@mohinderkaur6671]

Great work! I would have built a transistor oscillator driving a tube tx. But this is great too!

[@stefanlowet2189]

when open key on a hot tube can the cathode heater isolation hold ???

[@markkazdad381]

Hello, Helge. I found this video while searching for homebrew transceivers and I wanted to let you know I really appreciate that you showed the development process, such as how you found the resonant frequency. If you had wanted to use the transmitter on 20, 30 and 40 meters could you have just left the variable capacitor installed and make a scale so you would know where to set it? Or are there other stages that would prevent that from working? I wish you had left in footage of testing the secondary coils you made and showed how you made them. I had never seen your technique for making homemade capacitors. Maybe how to make capacitors and coils would be good topics for future videos. - Mark KI4HQK

[@joeblow8593]

Cool project

[@stephennelson-smith3312]

What is your source for teflon dialectric? And how thick/thin is it?

[@kittony71]

do you sell Arduino oscillator

[@G7VFY]

All we need now is a KIT. The tube/valve could be a 6v6 or similar....A couple of button could be be used to move the oscillator's freequency up or down with 'simulated' crystals. G7VFY

[@Valvulo]

Nice design! Makes me want to open my old parts box and build some QRP stuff. I got some 12W6 there, and I'm sure they'll work just fine! 73 de PY2ALV.

[@thomasrielly2679]

Outstanding!

[@bill-2018]

Oh, disappointed when I saw the Arduino. Always nice to see home made equipment, it sounds nice too. I did one using a 61BT valve out of a non working oscilloscope and xtals for 7.030 and 5.262 MHz. G4GHB

[@BC610E]

If those boxes of 12A6 came from an ex-military source, then they may be for the TCS transmitter which used three of them. Lots of Allied nations used the TCS in WW2.

[@JulioGutiérrezdiaz]

Muy buen trabajo

[@asbjrnursin8912]

Interessant prosjekt Helge og et godt resultat. Artig å se at du har begynt å bruke elbug :-). 73 de LA5MT.

[@jans3745]

Dear Helge, I really enjoy watching your videos, cause it's unique on youtube. I just build my first transmitter, a Michigan Mighty Mite, and got around 600 mW max. output power. It was much fun building it on an classic style chassis and I will build an 40's style enclosure for it, but I'm not yet happy about the range. I got about 5 km with 20 m of wire attached to the wall of my house and an 1 foot metal rod as ground. Worked for receiving, but surely a bad transmitting antenna for 80-m-band. Which type of antenna are you using? Could a better antenna improve my range? And do I need a shielded wire to the antenna? I'd be really happy about an answer! Best regards from Jan

[@LA6NCA]

Thanks for the interesting comment. Yes I can suggest a better antenna. When you use a 20 meter antenna at 80 meters, there will be a lot of current in the ground. I therefore suggest a 48 meter long wire for the antenna. Then you will get a fantastic much better signal. This is much more high-impedance, so you need a small tuner. This is the antenna I use in almost all my videos. I'll be coming up with a video about this in a while. Alternatively, you can use a dipole.

[@jans3745]

Installed 42 m end-fed half wave antenna in an old hayloft and heard very strong signal from 2.3 km away. Going to build an external antenna tuner (L-Match) to improve the antenna. I'm getting really fascinated about homebrew and vintage radio. My next project will be trying to get an Russian R-311 receiver recently offered on Ebay and restore it as a part of the classic 80-m-station I'm building in the hayloft. Happy about the answer and joyfully waiting for a new video Jan

[@niivoenterprises-4217]

@@jans3745 I'd love to see a video, as I am having a hard time picturing that hayloft of yours. you are lucky to even have a hayloft in this modern world. i'd love having a hayloft. it just seems so much like a 50's dxpedition thing to do :)

[@СергейТк-у9в]

Красиво получилось )

[@vidarstensletteneik6603]

Fin video Helge. Flott med pleksiglass for å sjå komponentane. Skal sjå flere av dei du har lagt ut. 73. LB2OI, Vidar

[@TomaszBorowskiTOM124q]

Lovely !

[@krasimirdimitrov9379]

Vy nice, 73!

[@pp5tu]

Nice.... 73 PP5TU.

[@jimw7ry]

80 meters... meters....

[@АндрейХрамов-ф5я]

👍👍👍👍👍 LA6NCA de R1CBD 73!