Tuned Version: Carlson Power Antenna Circuit #2!
Added 2024-08-03 02:20:15 +0000 UTCFurther range, and the ability to tune to (or peak) the desired frequency... It works fantastic! Modified schematic and info attachments below. Enjoy!
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Comments
Hi All, just join patron in support of Mr. Carlson, great stuff. I would like to build the Power Antenna and would like the Schematic for #197. Who do I send the request? TU
Dave Anderson
2025-03-03 02:51:22 +0000 UTCEnjoyed the video. I have a question. Is it possible to use a ferrite bar type of AM antenna in place of the loop antenna? Looking for ways to reduce the size of the project a bit... Thanks
Kerry
2024-10-25 00:36:29 +0000 UTCPaul, may I ask two questions to understand how the circuit works? 1) what is the purpose of the 0.1µF/220µH series LC circuit right at the input of the device? Its resonance frequency is around 33kHz. 2) the tuned LC circuit is a *series circuit* which means that its impedance is *minimal* at its resonance frequency. Why do you still get a maximum when you tune the capacitor?
Helmut Heller
2024-10-12 11:33:54 +0000 UTCOK, thanks Paul; I had placed my project on hold until this was resolved, and now I can proceed again - I've just received a blessing from the master! I infer from this that the minimal amount of inductance I have measured in these resistor types is so small that circuit and design parameters will not be drastically affected. Probably better to use one that presents micro-Henries of inductance as opposed to milli-Henries; since smaller is better.
John Moorhead
2024-10-04 14:16:30 +0000 UTCHi John, large metal film or carbon film resistors will work. No wire wounds!
Mr Carlson's Lab
2024-10-04 07:59:03 +0000 UTCAfter perusing that site, I ended up disappointed. Yes, they have a whole section dedicated to non-inductive resistors, but the selection and specific values needed for these Carlson circuits are not available or only in massive wattage,s so physical size is massive.
John Moorhead
2024-10-03 04:49:19 +0000 UTCI bought the 6AH9 tube from www.tubesandmore.com (also known as Antique Electronic Supply). I just checked on their site and they do not list any at the moment. But you might check with them as they get different stock all the time. They do currently have the 6AH6 tube that Paul designed a slightly different amplifier circuit around; price is listed as $3.55. I have purchased many items from this company and they are first rate; great products at reasonable prices and their customer service is great as well.
John Moorhead
2024-10-03 04:45:20 +0000 UTCHi, My quest for the 6AH9 compactron has, so far, turned up only tubes on eBay selling at ridiculous prices. Do you have a source? Thanks.
Kerry
2024-10-02 21:47:37 +0000 UTCI posed the same problem and question to the RF forum on EEVblog, and got a referral to Surplus Sales of Nebraska. Yep, they have a complete section dedicated to non-inductive resistors - quite a few different types as it turns out. Anyone looking for resistors for this project can go there and you should be able to find what you need.
John Moorhead
2024-09-01 04:35:56 +0000 UTCI have all the parts for both the 6AH6 and 6AH9 RF amplifiers, except for the non-inductive high-wattage resistors. Most high-wattage resistors (2W and above, including 5W) these days are almost always going to be wirewound which clearly have inductance. I have purchased alternative types advertised as carbon composition, carbon film, metal film, metal oxide film, glass epoxy from several different sources. Yet when I measure those for inductance, they all show a value in the micro or milli-Henry range. And I found through forensic analysis that the "carbon composition" resistors I purchased were actually spirally applied film on a ceramic base, and had definite inductive values. I've read that beyond an arbitrary point (say 500K Ohms and above) the inductance of the resistor is not really a factor. So I have two questions: 1) is it true that beyond a certain Ohms value, the inductance of a resistor will not be a major factor in a circuit that would otherwise be affected for tuning and frequency response? 2) is there any known source of pure non-inductive resistors (ideally true carbon composition type) in higher wattage values? I have searched all the major parts houses and have used search tools like Octopart and I am finding that true higher-wattage carbon composition resistors have gone the way of the Dodo Bird or are horrendously expensive, or are only available in large bulk quantities.
John Moorhead
2024-08-29 23:29:06 +0000 UTCThe place is in colorado dont know if they will ship to you
Gloria Jill Sydor
2024-08-15 23:15:17 +0000 UTCI don't think so, but they are very easy to come by. Lots of NOS tubes out there.
Mr Carlson's Lab
2024-08-13 01:48:30 +0000 UTCHi Paul Is there an equivalent tube, for the uk please.
Steven bryan
2024-08-11 17:45:21 +0000 UTCThank you.
Alan Wood
2024-08-11 10:01:22 +0000 UTCThank you Paul.
Colin Hannigan
2024-08-10 16:06:15 +0000 UTCThank You Paul. learning Electronics is my hobby. And learning electrical is my Job as a electrical Apprentice.
Jonathan Hughes
2024-08-10 04:11:19 +0000 UTCThe circuit is for radio frequencies probably up to 30MHz. Analog TV (if that is still available where you are ) has bands i the VHF & UHF way above what the Power Antenna circuit is working at. If your TV service is now all widescreen digital then its likely to be 500 to 700MHz realm so way, way above the Power Amplifier capability...
Pete Bronlund
2024-08-07 05:10:55 +0000 UTCI was just wondering if you can put it in circuit with a TV set
patrick miller
2024-08-05 16:39:03 +0000 UTCThanks again for all the time you put into these projects, to be able to share them with us. It's always appreciated.
darren bird
2024-08-04 20:24:39 +0000 UTCGotcha - Thanks!!
Jolie Rouge
2024-08-04 10:28:02 +0000 UTCH
David wagner
2024-08-04 08:49:25 +0000 UTCIs because if you look at the pinout numbering used you'll soon realize that there is no triode as a separate tube. it is just one physical tube that applies to both tube symbols. It is a small compactron style (all in one tube). For proper and well detailed explanation watch/re-watch video 192 (The Carlson Power Antenna Circuit!) where this project was originally presented (for the first time). As the name of this video implies, this is just a more refined/tuned version of the very same project therefore, lots more details in video 192.
Ovi4
2024-08-04 07:04:54 +0000 UTCBrilliant! Looking forward to the Macho Combo version of the Power Tuner. Just got started assembling the base version. It'll be cool to modularize the tuner section(s) so they can be added or omitted as needed for the application at hand.
Scott Morison
2024-08-03 22:20:05 +0000 UTCNIce. Don't see a tube number for that triode tube/
Jolie Rouge
2024-08-03 19:02:42 +0000 UTCThis is great! I was just getting ready to assemble version 1. Now I’m holding off for next one with a power supply. I can’t wait for that design!!!
Pat Welch
2024-08-03 16:54:39 +0000 UTCWow, you already have presented enough circuits to turn this into a broadcast band SW converter. Say, if some of your crafty fans were to combine your voltage variable capacitor oscillator that you presented a few months back, with an RF mixer, and this project, you could build an AM short wave radio of sorts, couldn't you?
Joe Katzbeck
2024-08-03 15:18:23 +0000 UTCI noticed that too! LOL
James Roberts
2024-08-03 15:04:49 +0000 UTCThe original orange bench!
Steve Foudray
2024-08-03 04:12:49 +0000 UTCIf I understood the mathematics of these circuits, I would build these projects. I will have to stick to buying short wave sets.
Bill Keilholtz
2024-08-03 03:48:08 +0000 UTCPaul, you never cease to amaze! This antenna circuit will be a game changer for my Kenwood transceiver restoration project. Thanks for all that you do!
Bill Hanks
2024-08-03 02:35:39 +0000 UTCI really like this idea And keep up the great work on the BC 348
Kenny Fidler
2024-08-03 02:29:00 +0000 UTC
