Gregg - the old school breadboard looks really cool. As Bob noted, try tweaking your volume on your tablet to ensure your modulation depth is optimized and Bill was spot on regarding a good ground and antenna. The range afterwards should cover your residence In addition, the oscillator has harmonics, so be sure you’re tuned to the primary carrier. Best, Don
Looks great! Try a 3 meter (9 foot 10") antenna. Also the modulation is controlled by the volume of your tablet. You want it just high enough for clear audio. Too high and you'll start distorting. Great video!👍👍
That turned out really nice Gregg and you made it sing! To clean up the output it might be a thing to reduce the input volume a touch. As for making it more powerful, any simple RF amplifier should work with it, maybe a single common emitter design. I know that Bob and Doug are working on a simple AM transmitter board with an RF amp stage after the basic circuit here so it might be something to look at or Don at Restore Old Radios also has an AM transmitter circuit. Whatever you build, it will be cheap because of the FCC limits you have set at 100mW output power into a maximum 9 foot antenna. Many thanks for the shout out!
Radio Shack used to sell little 'potted' circuits. (1964).They looked like black, epoxy, ice cubes. They had one that was an AM transmitter. It had a fixed capacitor and a variable loopstick type antenna coil (just the brass screw sticking out) . You turned the screw and it was tuned to a station. They used to transmit very well, at least 50 feet with a 2 foot antenna. I'd love to see that circuit since that variable capacitor you have is expensive and rare nowadays.
Cool stuff! Our 2nd quarter EE class built a transistorized AM radio via the "nail method" breadboard! It worked but it was a job mounting the IF transformers! Yikes! Freaky Fact: Your Moose meows at the same frequency as our Zoey cat. Watching this video with my headphones on I kept looking for Zoey! LOL
A neat looking job but the lack of a ground plane could be problematic. One suggestion I have seen in the past is an inverted cake tin with tag strips soldered on for the components. Not as good looking but electrically superior.
I think the distortions are due to too deep modulation. I like this way of the installer. It is very legible. I also used it in my project without knowing about yours
Nice design indeed well done yes old school is so cool. Since your vid was over 2 years ago I'm sure you already realized the problem and fixed it? However, just in case. I'm a now retired ham radio tech 33 years via Radio One.
Just get close to 18 yards hook up wire and wind it in a loop 6" wide. It'll do great. Use PP3 battery instead of supply. Battery is cleaner, if you use power supply try adding an EMI filter between wall outlet and supply plug to take out EM noise and hook a wire to negative rail and attach other end to a water pipe going into ground. That's it. You are done
Hey Dale, thanks for watching. When I get back to my workshop in January I'll put a copy of the parts list and schematic in my next video on the Mantola R-654 radio for you. I haven't done the RF amp yet. Maybe I'll do that and then just do that video and add the transmitter schematic and parts list on that one.
If you're using a short antenna, you need an antenna-matcher ... in fact nothing more than 2 variable C's with a coil in between. Please adjust modulation-depth.
Whenever I want to increase range I put more power on transmitter by putting little more voltage but that not good method a simple dipole antenna will give very high range
Az audio bemenetné szükséges egy potméter és egy sztereo-mono jelközösítő amit én két darab 10 uF vagy 220 nF kondenzátoral oldottam meg amit egy LM386-os IC elé építettem.
No need to wait for the live show on Sunday it is live from about 8 am central time. He records his shows for prosperity on a CZcams. I look forward to your future shows and reading your live comment over on Radiocruncher.
Absolutely awesome video! Some friendly criticism no. You need to learn how to condense the videos better. I fast-forwarded through the hole drilling and hammering of the nails LOL leave the boring parts out 😝
@@greggsvintageworkshop8974 since I commented this for months ago I've come a long way but I absolutely love radio and I'm fascinated with it. I bought two old icoms and built a 40 meter dipole. The lowest I've heard people on is 80 m. My goal is to build a 160 m dipole and make contact! Oh yeah and also get my ham license lol
Bobi, I don't have any links to the schematic, but at 5:44 in the video I hold it up, so you can pause and screen shot it. It has all the values of the components listed too. Thanks for watching.
Hi Joseph it is in the video both on 8x10 and full size for the cutting board. Do a screen shot if possible, otherwise remind me in two weeks when I get back to the shop and I'll email a copy to you. You will need to send me your email address.
That's not really how to make AM. It's a modulated free running L/C oscillator. You probably have almost as much FM as you do AM. But that output stage, if you AM modulated that you'd be heading in the right direction
I agree with you sir. I made one myself and noticed that FM was there as well. I needed to separate oscillator and modulator and had to use audio transformer for modulation. It worked well afterwards, no FM
@@awaismushtaq5719 It's fairly easy to make a reasonable AM transmitter. If you want good depth of modulation, you apply the modulation to a few stages- say a driver amplifier as well as the output stage. You keep the carrier generation stage completely separate of the modulated amplifiers. It just takes playing around and persistence. A normal audio power amplifier is all you use for the modulator
@@awaismushtaq5719 Just a question, have you thought about the fact that a normal audio amplifier running on a single rail supply has half of the supply voltage present at its output before the output coupling capacitor? Thinking about this fact, it's easy to see how it can be used to supply the amplifier stages you wish to modulate: that voltage will swing above and below that voltage value in sympathy with the audio signal. This is the perfect basis for transformerless AM
Thank you for the your videos.
I think a 6 foot antenna wire would work much better for distance to your radio reception ,
Very nice! Enjoyed the Old School breadboard... That will be cool along side of your radios! Thanks for sharing...Take Care--Larry
Thanks Larry!
Gregg - the old school breadboard looks really cool. As Bob noted, try tweaking your volume on your tablet to ensure your modulation depth is optimized and Bill was spot on regarding a good ground and antenna. The range afterwards should cover your residence In addition, the oscillator has harmonics, so be sure you’re tuned to the primary carrier. Best, Don
Thanks Don!
Looks great! Try a 3 meter (9 foot 10") antenna. Also the modulation is controlled by the volume of your tablet. You want it just high enough for clear audio. Too high and you'll start distorting. Great video!👍👍
Thank you Bob! Great information sir!
That turned out really nice Gregg and you made it sing! To clean up the output it might be a thing to reduce the input volume a touch. As for making it more powerful, any simple RF amplifier should work with it, maybe a single common emitter design. I know that Bob and Doug are working on a simple AM transmitter board with an RF amp stage after the basic circuit here so it might be something to look at or Don at Restore Old Radios also has an AM transmitter circuit. Whatever you build, it will be cheap because of the FCC limits you have set at 100mW output power into a maximum 9 foot antenna. Many thanks for the shout out!
Thank you George! Thanks for that suggestion and info sir!
Radio Shack used to sell little 'potted' circuits. (1964).They looked like black, epoxy, ice cubes. They had one that was an AM transmitter. It had a fixed capacitor and a variable loopstick type antenna coil (just the brass screw sticking out) . You turned the screw and it was tuned to a station. They used to transmit very well, at least 50 feet with a 2 foot antenna. I'd love to see that circuit since that variable capacitor you have is expensive and rare nowadays.
Not rare, practically extinct
Cool stuff! Our 2nd quarter EE class built a transistorized AM radio via the "nail method" breadboard! It worked but it was a job mounting the IF transformers! Yikes! Freaky Fact: Your Moose meows at the same frequency as our Zoey cat. Watching this video with my headphones on I kept looking for Zoey! LOL
Too funny Tim!
Nice to see simple home construction, but eeek! There's a LOT of audible FMing there! Given how the mod is applied that's understandable.
Awesome.
Thank you!
A neat looking job but the lack of a ground plane could be problematic. One suggestion I have seen in the past is an inverted cake tin with tag strips soldered on for the components. Not as good looking but electrically superior.
a trick : you can watch movies on flixzone. Been using them for watching all kinds of movies lately.
@Rocco Davis yea, been watching on flixzone for years myself :D
I think the distortions are due to too deep modulation. I like this way of the installer. It is very legible. I also used it in my project without knowing about yours
Nice design indeed well done yes old school is so cool. Since your vid was over 2 years ago I'm sure you already realized the problem and fixed it? However, just in case. I'm a now retired ham radio tech 33 years via Radio One.
Yes sir, thanks Paul and thanks for watching!
Connect a longer antenna, say 7m or longer. Should get a lot more output.
I think it will have good range if you ground the negitive rail and put about a 10 foot antenna on it.
Thanks Bill, I'll give that a try!
Just get close to 18 yards hook up wire and wind it in a loop 6" wide. It'll do great. Use PP3 battery instead of supply. Battery is cleaner, if you use power supply try adding an EMI filter between wall outlet and supply plug to take out EM noise and hook a wire to negative rail and attach other end to a water pipe going into ground. That's it. You are done
Is there a place to download the schematic and parts list? Also a schematic of an RF amp? Great video!
Hey Dale, thanks for watching. When I get back to my workshop in January I'll put a copy of the parts list and schematic in my next video on the Mantola R-654 radio for you. I haven't done the RF amp yet. Maybe I'll do that and then just do that video and add the transmitter schematic and parts list on that one.
If you're using a short antenna, you need an antenna-matcher ... in fact nothing more than 2 variable C's with a coil in between.
Please adjust modulation-depth.
I did that sort of thing with a FM transmitter but using a 12V battery proved to push too much current and burned the resistors out.
LOL 🤣
Whenever I want to increase range I put more power on transmitter by putting little more voltage but that not good method a simple dipole antenna will give very high range
Az audio bemenetné szükséges egy potméter és egy sztereo-mono jelközösítő amit én két darab 10 uF vagy 220 nF kondenzátoral oldottam meg amit egy LM386-os IC elé építettem.
❤🎉😂😂😂❤
いいね
Gregg, check out Radiocruncher he does a great live show on Sunday where George and loads of other CZcamss hang out.
Thanks John, I'll see if I can find it.
No need to wait for the live show on Sunday it is live from about 8 am central time. He records his shows for prosperity on a CZcams. I look forward to your future shows and reading your live comment over on Radiocruncher.
Hang it on the wall, and it can be called the Vertically Suspended AM Xmtr...
Heh Heh, that's funny! It was a fun project! Thanks for watching!
Absolutely awesome video! Some friendly criticism no. You need to learn how to condense the videos better. I fast-forwarded through the hole drilling and hammering of the nails LOL leave the boring parts out 😝
Thanks for the suggestion, this was one of my earlier videos so I was ,and am, still learning. I appreciate it!
@@greggsvintageworkshop8974 since I commented this for months ago I've come a long way but I absolutely love radio and I'm fascinated with it. I bought two old icoms and built a 40 meter dipole. The lowest I've heard people on is 80 m. My goal is to build a 160 m dipole and make contact! Oh yeah and also get my ham license lol
EVERYTHING LOOKS OK, BUT PHONE OUTPUT AUDIO IS LOUD, AND OVER MODULATES ON RADIO, THAT'S ALL...
Please give some links to the schematics, I really want to build this myself!
Bobi, I don't have any links to the schematic, but at 5:44 in the video I hold it up, so you can pause and screen shot it. It has all the values of the components listed too. Thanks for watching.
@@greggsvintageworkshop8974 good idea, thank you!
😂
I wish you send me that circuit diagram
Hi Joseph it is in the video both on 8x10 and full size for the cutting board. Do a screen shot if possible, otherwise remind me in two weeks when I get back to the shop and I'll email a copy to you. You will need to send me your email address.
It is overmodulated.
The transmitter will have to be a C-QUAM Stereo AM Transmitter.
That's not really how to make AM. It's a modulated free running L/C oscillator. You probably have almost as much FM as you do AM. But that output stage, if you AM modulated that you'd be heading in the right direction
I agree with you sir. I made one myself and noticed that FM was there as well. I needed to separate oscillator and modulator and had to use audio transformer for modulation. It worked well afterwards, no FM
@@awaismushtaq5719 It's fairly easy to make a reasonable AM transmitter.
If you want good depth of modulation, you apply the modulation to a few stages- say a driver amplifier as well as the output stage. You keep the carrier generation stage completely separate of the modulated amplifiers. It just takes playing around and persistence. A normal audio power amplifier is all you use for the modulator
@@Dazzwidd will try that
@@awaismushtaq5719 Just a question, have you thought about the fact that a normal audio amplifier running on a single rail supply has half of the supply voltage present at its output before the output coupling capacitor? Thinking about this fact, it's easy to see how it can be used to supply the amplifier stages you wish to modulate: that voltage will swing above and below that voltage value in sympathy with the audio signal. This is the perfect basis for transformerless AM
@@Dazzwidd cool! Will give it a try too