According to the schematic diagram, I would like to know what the range of this transmitter will be when the maximum power switch is turned on and off ?
You mention the big coil wound on the oatmeal box is a choke. Would this function as the plate loading coil and if so could you briefly tell how to calculate its value for the 6L6. Are you operating class C?
It is the frequency that is important, the AM band about 500-1700 KHz. In ohms I would not pick an RF choke less than 100K ohms, the higher the better, I would pick at least 1meg. Use the middle of the AM band and the ohms you want in a XL calculator to get the Henrys. All this choke does is to keep the RF from going into the power supply. The 6L6 is Class A. Google "XL calculator".
I posted a video response to this video, but nothing has yet shown up. Maybe it takes a while to appear...dunno. If it ultimately fails to show up, then I'll give it another shot later on.
You would change the tank tuning circuit. If you need a little higher frequency, a few less turns on the coil and a little less on the variable capacitor. If you need a little lower frequency, a few more turns on the coil and a little bigger variable capacitor.
This is awesome.He is actually using a tape recorder instead of an IPOD! I have an empty Quaker Oats tube sitting right here ready to be wound and I have a transformer and tubes and these parts can be bought from antique radio parts suppliers,quite inexpensive. I have seen some homebuit AM transmitters but this one is all vacuum tube! Can transmit music to all my tube radios now! I imagine you could build a case over the tuning capacitor and enclose bottom of chassis to insulate for safety.
When I built this transmitter YouTube may not have been around yet. Yes, a nice clear plastic cover over the tuner would be a good idea. I would still use a wooden knob. If you can not find a wooden knob, a plastic one will work, just make sure it is not black in color. Some black knobs get the black color by using carbon. Carbon will conduct RF.
I can't understand why kids are curious about radio and tv like we were. It seemed magic to me, and even though I have studied theory and understand it well, it still seems like magic to me!
I do think the IC has made it much less fun. I was very disappointed when told my chosen E school no longer taught tubes!
I've no experience soldering and even less than none with kits. Thinking about taking the plunge and getting the AM25 to do a neighborhood talk and news station. I fear spending the $100 and messing it up though heh.
Already have a 300 ft longwire antenna for my Grundig 750 receiver. Have 300 more feet of copper wire to construct another antenna if need be. Thoughts?
For some help you might locate a Ham Radio Club in your area. On building the kit, get thoroughly familiar with every part before you start to build it. If you want to cover a good distance I would recommend a Ramey FM transmitter. You can get one for will under $100. They work very well!
No clubs in my area. Considering starting one myself.
Thanks for the recommendation. I think need to stay on AM as my setup will not be part 15 compliant. I've read that AM basically gets no attention from the FCC especially if it's small.
If I remember correctly, I believe Part 15 stipulates that micropower AM transmitters must be limited to no more than 300 milliwatts ERP. But you're right, if you have something that puts out a couple of watts, they probably won't notice unless they get a lot of interference complaints.
Mine is running less then 300 milliwatts ERP. I believe that all radios stations AM/FM and TV stations are going away as we know them now. Everything will be on the web. When I want to listen to KMOX in St. Louis I click on the icon on my desktop. The days of one thing doing one thing are over. Today you have to special order an AM radio in a new car if you can even get one. Also most of the AM radios made today are awful.
You're definitely right, although I think radio and TV transmitters will still be around for a while yet. I also agree about your statement on AM radio quality (or lack thereof). When they started putting an entire radio on a single chip, performance started going the way of the dodo. I'll stick to my discrete-component receivers, at least I can repair them if something fails!
Would be sad, the young people would rather play video games, watch "reality" tv, or be on the cell phone. Off hand what is the output voltage? Is it close to the 100mw the FCC requires?
I was having fun with the design. A young friend of mine wanted to build a AM Transmitter. I used the parts he had in his stock and he also had a TP-roll and a Quaker Oats box. Mine falls under Part 15, will yours?
I still got the transmitter and loading coil, but I am living in the suburbs now so I dont have the room to set it up, to have reasonable range... but not intending to now, I tried to make a l1 metre diameter loop antenna to see if I could break the distance barrier of the end of my street but the thing arced at resonance... OUCH!!
I have helped detune cellular tower that are close to 50K watts AM station transmitter sites. If you hand gets in the wrong place it is very painful. Tuned circuits are fascinating and powerful. Thanks again. Keep experimenting!
Nice transmitter :). I have built a transmitter myself and had a whole shed roof as a ground plane, so I set up a bottom loaded antenna with moving coil tuning, with a capacitance hat. The transmitter was a solid state design that gave out 1 watt on a supply of 13.8 volts, I fed it with 18 volts so I had no idea what the power output was but the result was it covered 4 Kilometres, but some people up to 8 K claimed that they managed to tune in.
Thanks. Sounds like you had a very nice design, they are surprisingly useful. I would like to build a solid state transmitter and have bought some parts for the project. I keep getting sidetrack with other things. Maybe I'll make it a Winter project.
The first one I built was when I was in High School. I had it so over powered the 6L6 plate glowed cherry red. That was a neat thing in HS. This one covers the house nicely.
It is very adaptable and it would handle 14 MHz but the internal capacitance of the 6L6 would start being a problem at 50 MHz. I have it set to just cover the house and measured it with an AM field strength meter to make sure it stays in the house.
Very nice transmitter. Also a nice collection of info that you have shared with us all.
I have just started to build this xmitter to feed the radio in my workshop (garage) from the output of my computer sound card and was hoping you might answer a few questions. Can I change the 4" antenna tube for 3" and adjust the number of turns to 229 to come up with the same 1833.6mH? Also, can I use diodes and caps to rectify power in place of the 5Y3? Thanks and keep up the good work here.
A 3 antenna should work, you can always add wire as needed. You can use almost any RF choke for the Oats box. I used an Oats box because my friend Michael was in High School at the time and making coils is a neat thing. Also it is so over done that it also acts as an antenna. You can use high voltage diodes to replace the 5Y3 if there rating is sufficient. Thanks.
Limited recourses is more of a challenge. I think make the coils gets the circuit into the head better. My friend has made all kinds modifications. The oat box coils is so over done that most of the time you dont need an antenna. Thanks!
I would think a 6L6 output tube would put out a lot of power. I have a Ramsey kit but when I got it it was missing a couple of parts. I aquired the missing parts but when I got to winding the ferrite beads I got stuck. The instructions in the book are worded quite strange or at least I found it to be and I got frustrated and set it aside. I might look into it again tomorrow. GK
Great great. I want to be an inventor someday. I would like to know the materials you've use in making that thing. And another one, if you have other invention please send me a message.
Well, it's not really an invention. I've been building these since High School, in many variations. All the parts are labeled on the wiring diagram and in the pictures, located on the web link in the "More info" for this video. What influenced this design was the parts I had in stock.
Thanks, it was a fun project, building AM transmitter is more difficult to build than other some other projects. But it was well worth the aggravation.
Awsome!!! I recently got back into radio, I already had some AA5's, now pre war wood sets. Thank You for all the info, I want to transmit various programming to the old survivors. (RCA 55X, Philco 90, Atwater Kent 90, Philco 38-12, Packard Bell 46D). P.S. I loved the prodution of Your vid, it sounded great with Your vocals + the backround music!
Even with the limitations of YouTube audio this sounds great. I like the idea of a tube TX tube vintage tube RXs. I'm using the Ramsey AM-1 which works, but the quality isn't all that great. I did make it crystal controlled which kept it from drifting all over the place. How's the drift (afetr warm-up) on your design?
It's very stable. I used new (NOS) tubes which helps the stability and the fidelity. Of course being a tube circuit, they do drift, but this circuit is so stable that I have never notice any drift. One YouTuber has built one, CameramanLink, he is test his now. He has had a few problems and that to be expected, building a transmitter is a little hard to execute than some other circuits. I think he is going to make a video about his transmitter.
You have stated the problem perfectly. I have one K-488 built and another still in the box. I'm only interested in transmitter to my radios in the house with good quality audio. I have made sure by testing and careful measuring with a field strength meter that this transmitter can not interfere with the neighbors or any AM commercial stations.
Ramsey makes a solid state Professional AM Transmitter Kit AM25, that may be what you are looking for. Just Google "Ramsey AM25".
Houses have many sizes and I really don't know what's the length of your house ;)I would like to ask you if this transmitter could transmit about 15 metres (16 yards - 49 feet) or 30 metres (32 yards - 98 feet) away in radius ? Sorry for comment duplication because it's a mouse click accident.
With the antenna that I'm using now, it limits the range nicely to about 50 feet. AM wave propagation is all about ground fields and large tuned antenna systems. And I'm not doing either with my short un-tuned wire antenna.
My purpose is to transmit to the radios in my house this good quality audio.
If you're planning on running your own AM radio station the Ramsey kit model AM25 may suit your needs. Many schools and low power AM broadcasters use this transmitter. And in the USA low power AM broadcasters are required to have a license. The end user is responsible for complying with all FCC rules & regulations within the US, or any regulations of their respective governing body.
Yes I have. But the FM transmitter I use today is a Ramsey Kit model FM10C. It is Stereo and it works very well. The quality of the audio is very good and so is the stereo separation. The signal travels a surprising distance with just a small antenna.
I have had requites for a solid state AM transmitter literally from around the world. So I have started researching the availability of parts that everyone can get, or make on their own. I'm working on it!!
Feel joy when i see this! Absolutely amazing that there are still people in the world that have the capacities to develop and build these kind of schematics with tubes. Did it take much time to build it?
THANKS!! I really appreciate that. I used this as a learning device for a younger friend. So speed was not the goal. He is still modifying it by the way. I have been building transmitters and receivers and all kinds of stuff since High School. And I'm still fascinated by it all and I don't think that will change. I'm sure you get the same satisfaction that I do when I fix a radio or design a circuit and it works perfect. Thanks again.
Fantastic! Can we get that diagram with transistors in place of the tubes? :)
I'd like to build both a transistor and tube version when I get the time. What a great way to listen to some of my old mp3's of The Carpenters and Roger Whittaker.
I really don't know how many transmitter circuits I have built and experimented with. I have built many transistor transmitters also. Some that will transmit AM & FM simultaneously and with a very wide tuning range.
cool...I also had one years ago ..I also build them out of old fm tube radios and make a fm transmitter that will broadcast well ..enjoyed the vid a lot
Rick... This would be great to play old time radio programs into an old tube radio. I can imagine a big console radio in the living room playing, "The Shadow".
YES YOU DO!!! I use it all the time. This is one of the more useful projects I have done. I'm also adding information on the link. There's some deference's between the picture and the wiring diagram. I completed work on this about four years ago and probably got tired of making updates. Plus I was still working on the book.
At last I get to see it. So cool. Gotta have one. It'll be my first-up project after finishing the two radios that are now in the hopper. Where did you obtain the chassis? Great video.
You need one of these!! The audio is much better than in the video. I believe that everything is going to the WEB, EVEYTHING! If I want to listen to KMOX in St. Louis MO I just click on the icon on my desktop.
I actually have one of those kits still in the box, I'll probable use the parts for something else. I have thoroughly tested this transmitter's performance and it covers the house very nicely and does not interfere with the neighbors. And I think its neat looking.
Very fast, my first one I built was when I was in High School. I over powered it so much that the plate of the 6L6 glowed cherry red, neat thing in HS. This one I was using to help one of my younger friends to learn with. I'm glad we took our time because he had a lot of good questions that influents the design. He is still modifying it. If you have all the parts you could build this in a day.
One station that I work has a four antenna array. If I were to borrow that system and connect this little transmitter to that array and tune it to the antenna array's frequency. The carrier would travel several miles with or without modulation.
ok..i have been lookin for a wway to broadcast a longer range than 500 feet on an am transmitter while staying legal...i really dont want to get in trouble. could u exlpain this overmod thing to me? six-7 miles is sick!
You can get pretty far using a good ground field and a tuned antenna system. You will get into big time trouble if you try an compete with a commercial station or cause interference in your neighborhood.
I'll have to try building this! Thanks for including the coil form data on the schematic (the coils are even based on common items like a toilet roll or quaker oats can!)
Also the wire is from Radio Shack. I thought that in the future it would be more important to have a good Transmitter. Everything is going to the web and I want to be able to use my radios. I think you will be very pleased with the performance of this transmitter. A good friend, who has been a broadcast engineer since dippers, was surprised at the audio quality. And he tells it the way it is.
WOW!!!!! This is amazing!!!!! The sound quality is great!!!! Did you design this circuit? This completely blows away the crappy one I made before. I'm definetely trying one of these! Great job!
Yes, it is my design. Believe me it is definitely worth the effort to build one of these. This is a good basic design and easily modified. You can download the information from the URL link in the "About This Video." Let know how you progress with this project. I use the transmitter all the time. And THANKS!!
Hello AllAmericanFiveRadio,
According to the schematic diagram, I would like to know what the range of this transmitter will be when the maximum power switch is turned on and off ?
joeypc87 2 weeks ago
@joeypc87
Low, covers most of the house. High, covers the house and a little outside the house. Ten feet maybe.
AllAmericanFiveRadio 2 weeks ago
Great diagram :-)
charlessmyth 8 months ago
"Beautiful Transmitter"! Do you sell them?
48alfaone 10 months ago
Thanks 48alfaone
No, it is just a project.
AllAmericanFiveRadio 10 months ago
You mention the big coil wound on the oatmeal box is a choke. Would this function as the plate loading coil and if so could you briefly tell how to calculate its value for the 6L6. Are you operating class C?
dwtees 4 months ago
@dwtees
It is the frequency that is important, the AM band about 500-1700 KHz. In ohms I would not pick an RF choke less than 100K ohms, the higher the better, I would pick at least 1meg. Use the middle of the AM band and the ohms you want in a XL calculator to get the Henrys. All this choke does is to keep the RF from going into the power supply. The 6L6 is Class A. Google "XL calculator".
AllAmericanFiveRadio 4 months ago
@dwtees
Usually the formulas for the calculations are on the same page as the calculator.
AllAmericanFiveRadio 4 months ago
ramsey is nice but i dont really like the range on it much. how much range will this model get with a good aerial? couple miles?
GMSamuelRhine 10 months ago
@GMSamuelRhine
NO, just the house. If you want range, build my FM one transistor transmitter T2-3 T3-3
AllAmericanFiveRadio 10 months ago
@AllAmericanFiveRadio ok thanks
GMSamuelRhine 10 months ago
how do i find this? can you email it to me at jasolinejones@yahoo.com or tell me how to find it please?
TheJohnsoline 1 year ago
@TheJohnsoline
I have updated the link in the description (more) of this video.
AllAmericanFiveRadio 10 months ago
Rick,
I posted a video response to this video, but nothing has yet shown up. Maybe it takes a while to appear...dunno. If it ultimately fails to show up, then I'll give it another shot later on.
Regards,
John
joernone 1 year ago
could you please tell me: what's the fast distance that the radio receiver can get signal from the transmitter?
aolyncom 1 year ago
@aolyncom The speed of light.
AllAmericanFiveRadio 1 year ago
@aolyncom can you send me a diagram too please?
TheJohnsoline 1 year ago
@TheJohnsoline
The link is in the description/more of the video.
AllAmericanFiveRadio 1 year ago
can you send me the circuit diagram of this??.,
together with pats list.,
thanks a lot
geliegelie 1 year ago
Thanks geliegelie
Look in the discription. I have put a link to the information there. If you have a problem finding it, just YouTube email me.
AllAmericanFiveRadio 1 year ago
I like your proyect, congratulations!!!
oso3470 1 year ago 2
Thanks oso3470
AllAmericanFiveRadio 1 year ago
Comment removed
DJRadioactiveAnne 1 year ago
Sure. You would have to use a high voltage transistor. Or modify the oscillator circuit to work with lower voltage.
AllAmericanFiveRadio 1 year ago
yes DJRadioactiveAnne
AllAmericanFiveRadio 1 year ago
Can I substitute a Sold State Plug Rectifier for the 5Y3 Tube or will it mess with the circuit?
This looks awesome, And you are thorough with your Explanation as usual.
I love watching your videos and playing with old Electronics -Lisa W5FOX
mimsy1 1 year ago
Sure, as long as the diodes have a high enough rating. Thanks.
AllAmericanFiveRadio 1 year ago
Whats its range?
viciokas1993 1 year ago
On the diagram 700KHZ 2.4MHZ
AllAmericanFiveRadio 1 year ago
i mean distance of reception, as in Km?
viciokas1993 1 year ago
I have mine setup to cover my house and it does that nicely. On the AM band to get distance you will need a outside tuned antenna.
AllAmericanFiveRadio 1 year ago
To get distance at a reasonable cost I would recommend going to a FM Transmitter.
AllAmericanFiveRadio 1 year ago
Hi,
If to be used in Europe, (LW frequency), which componet(s) will you change?
Thanks.
Denis
telspace 1 year ago
Denis
You would change the tank tuning circuit. If you need a little higher frequency, a few less turns on the coil and a little less on the variable capacitor. If you need a little lower frequency, a few more turns on the coil and a little bigger variable capacitor.
Rick
AllAmericanFiveRadio 1 year ago
Lol, well of course when I made the transmitter their where no IPods. But you are right! It is a computer device and will radiate RF noise.
AllAmericanFiveRadio 1 year ago
This is awesome.He is actually using a tape recorder instead of an IPOD! I have an empty Quaker Oats tube sitting right here ready to be wound and I have a transformer and tubes and these parts can be bought from antique radio parts suppliers,quite inexpensive. I have seen some homebuit AM transmitters but this one is all vacuum tube! Can transmit music to all my tube radios now! I imagine you could build a case over the tuning capacitor and enclose bottom of chassis to insulate for safety.
Thermionman1970 1 year ago
When I built this transmitter YouTube may not have been around yet. Yes, a nice clear plastic cover over the tuner would be a good idea. I would still use a wooden knob. If you can not find a wooden knob, a plastic one will work, just make sure it is not black in color. Some black knobs get the black color by using carbon. Carbon will conduct RF.
AllAmericanFiveRadio 1 year ago
On my channel click on Website it will goto a contact page. Thanks
AllAmericanFiveRadio 2 years ago
I can't understand why kids are curious about radio and tv like we were. It seemed magic to me, and even though I have studied theory and understand it well, it still seems like magic to me!
I do think the IC has made it much less fun. I was very disappointed when told my chosen E school no longer taught tubes!
timothyone1 2 years ago
Yep. The day of one thing, doing one thing, is over.
AllAmericanFiveRadio 2 years ago
Since AM is not used very much is it illigal to have high Watts so i gets a strong send?
User846 2 years ago
Will pretty much anything can be illegal. Here in the US you can get a small station community broadcast license.
AllAmericanFiveRadio 2 years ago
With the AM25, I believe you can jumper r33 and r34 to get it at a full watt. Sure would be nice to see the range on that.
malignantpoodle 2 years ago
The transmitter can be easily modified in many was. It was designed with lots of head room.
AllAmericanFiveRadio 2 years ago
I've no experience soldering and even less than none with kits. Thinking about taking the plunge and getting the AM25 to do a neighborhood talk and news station. I fear spending the $100 and messing it up though heh.
Already have a 300 ft longwire antenna for my Grundig 750 receiver. Have 300 more feet of copper wire to construct another antenna if need be. Thoughts?
malignantpoodle 2 years ago
For some help you might locate a Ham Radio Club in your area. On building the kit, get thoroughly familiar with every part before you start to build it. If you want to cover a good distance I would recommend a Ramey FM transmitter. You can get one for will under $100. They work very well!
AllAmericanFiveRadio 2 years ago
No clubs in my area. Considering starting one myself.
Thanks for the recommendation. I think need to stay on AM as my setup will not be part 15 compliant. I've read that AM basically gets no attention from the FCC especially if it's small.
malignantpoodle 2 years ago
Good luck!
AllAmericanFiveRadio 2 years ago
If I remember correctly, I believe Part 15 stipulates that micropower AM transmitters must be limited to no more than 300 milliwatts ERP. But you're right, if you have something that puts out a couple of watts, they probably won't notice unless they get a lot of interference complaints.
Erzahler 2 years ago
Mine is running less then 300 milliwatts ERP. I believe that all radios stations AM/FM and TV stations are going away as we know them now. Everything will be on the web. When I want to listen to KMOX in St. Louis I click on the icon on my desktop. The days of one thing doing one thing are over. Today you have to special order an AM radio in a new car if you can even get one. Also most of the AM radios made today are awful.
AllAmericanFiveRadio 2 years ago
You're definitely right, although I think radio and TV transmitters will still be around for a while yet. I also agree about your statement on AM radio quality (or lack thereof). When they started putting an entire radio on a single chip, performance started going the way of the dodo. I'll stick to my discrete-component receivers, at least I can repair them if something fails!
73 de NØJAA
Erzahler 2 years ago
Is this part 15 compliant. I want to make a transmitter for local broadcast. Do you think this will do the job to cover a town of 200?
LynyrdSky 2 years ago
Mine is. I measured it with a field strength meter.
AM broadcast may disappear. I don't any young people who listen to it and they could not care less about it.
AllAmericanFiveRadio 2 years ago
Would be sad, the young people would rather play video games, watch "reality" tv, or be on the cell phone. Off hand what is the output voltage? Is it close to the 100mw the FCC requires?
LynyrdSky 2 years ago
Detailed information is on the wiring diagram.
AllAmericanFiveRadio 2 years ago
I designed mine so that it covers the house nicely with a quality AM signal.
AllAmericanFiveRadio 2 years ago
where yuh got the oscillator and tubes?
adeshization 2 years ago
Antique Electronic Supply
tubesandmore(DOT)com
The wire from Radio Shack
AllAmericanFiveRadio 2 years ago
I love the Quaker Oats & TP-roll coils. Think I'll build one. Does it fall under Part 15?
Madness832 2 years ago
I was having fun with the design. A young friend of mine wanted to build a AM Transmitter. I used the parts he had in his stock and he also had a TP-roll and a Quaker Oats box. Mine falls under Part 15, will yours?
AllAmericanFiveRadio 2 years ago
do you need to check SWR on this
IWANNABEFAMOUS15 2 years ago
Not really. Not enough power.
AllAmericanFiveRadio 2 years ago
what in the schematics is meant by MFD and MDF ?
dingo27mobile 2 years ago
Both are Micro Farads.
AllAmericanFiveRadio 2 years ago
L-1 and L-2 are just air core right? No iron or ferrite rod
JPa311979 2 years ago
Yes, that is correct, both are air coils.
AllAmericanFiveRadio 2 years ago
I still got the transmitter and loading coil, but I am living in the suburbs now so I dont have the room to set it up, to have reasonable range... but not intending to now, I tried to make a l1 metre diameter loop antenna to see if I could break the distance barrier of the end of my street but the thing arced at resonance... OUCH!!
Cringle84 2 years ago
I have helped detune cellular tower that are close to 50K watts AM station transmitter sites. If you hand gets in the wrong place it is very painful. Tuned circuits are fascinating and powerful. Thanks again. Keep experimenting!
AllAmericanFiveRadio 2 years ago
Nice transmitter :). I have built a transmitter myself and had a whole shed roof as a ground plane, so I set up a bottom loaded antenna with moving coil tuning, with a capacitance hat. The transmitter was a solid state design that gave out 1 watt on a supply of 13.8 volts, I fed it with 18 volts so I had no idea what the power output was but the result was it covered 4 Kilometres, but some people up to 8 K claimed that they managed to tune in.
Cringle84 2 years ago
Thanks. Sounds like you had a very nice design, they are surprisingly useful. I would like to build a solid state transmitter and have bought some parts for the project. I keep getting sidetrack with other things. Maybe I'll make it a Winter project.
AllAmericanFiveRadio 2 years ago
is there a voltage limit created by the FCC? wat is it?
101popster 2 years ago
Google "fcc am rules"
AllAmericanFiveRadio 2 years ago
i am starting to collect parts for this transmitter Rick.
I'm going to collect all of the parts before i start building so i am not frustrated and make a full size layout.
Daniel
dnl5649 2 years ago
Hey Daniel,
Very good idea!!!!!
Rick
AllAmericanFiveRadio 2 years ago
Love the audio choice.
zaphodb777 2 years ago
Let me read you some of my poetry!
AllAmericanFiveRadio 2 years ago
Hitchhikers guide forever! Nice transmitter!
disgruntldtoad 2 years ago
Thanks. Hummm, Hydro Biscuits.
AllAmericanFiveRadio 2 years ago
That is nice! I need to build one of these pups. Seems like fun!
Lockemeister 2 years ago
The first one I built was when I was in High School. I had it so over powered the 6L6 plate glowed cherry red. That was a neat thing in HS. This one covers the house nicely.
AllAmericanFiveRadio 2 years ago
Nice!
GlobalAntennaWorks 2 years ago
How adaptable is this design? What would it take to make it work on 14, 28 or 50 MHz?
To transmit my voice rather than radio, could I just feed my D-104 microphone into a 12ax7-based preamp circuit in place of the CD or tape player?
In the video you say it could make much more power. How much does it make as-is, and how much can it make?
Great videos!
73 de WE5I
GlobalAntennaWorks 2 years ago
It is very adaptable and it would handle 14 MHz but the internal capacitance of the 6L6 would start being a problem at 50 MHz. I have it set to just cover the house and measured it with an AM field strength meter to make sure it stays in the house.
AllAmericanFiveRadio 2 years ago
Very nice transmitter. Also a nice collection of info that you have shared with us all.
I have just started to build this xmitter to feed the radio in my workshop (garage) from the output of my computer sound card and was hoping you might answer a few questions. Can I change the 4" antenna tube for 3" and adjust the number of turns to 229 to come up with the same 1833.6mH? Also, can I use diodes and caps to rectify power in place of the 5Y3? Thanks and keep up the good work here.
cranelift 2 years ago
A 3 antenna should work, you can always add wire as needed. You can use almost any RF choke for the Oats box. I used an Oats box because my friend Michael was in High School at the time and making coils is a neat thing. Also it is so over done that it also acts as an antenna. You can use high voltage diodes to replace the 5Y3 if there rating is sufficient. Thanks.
AllAmericanFiveRadio 2 years ago
This is from Merriam-Webster
chassis
Pronunciation: \'cha-sē, 'sha-sē also 'cha-səs\
AllAmericanFiveRadio 3 years ago
Great video. I hate to agree with the other person but:
chas·sis (shăs'ē, chăs'ē)
Chas-cee, Who cares. Say it any way you want. I know what you mean. Cheers
geeflyboy 2 years ago 2
OK, what color do you think the wheel should be, lol. The transmitter works great! Thanks.
AllAmericanFiveRadio 2 years ago
you say chassis like "cha-see" not "chassis"
Bassoskater 3 years ago
Very well designed! And it looks relatively easy to assemble, just a matter of winding the coils.Thanks!
73 de NØJAA
Erzahler 3 years ago
Thanks. Hope you have fun with it.
AllAmericanFiveRadio 3 years ago
Can a transmitter like this be powered to reach outside our atmosphere?
dexxtteer 3 years ago
With this design it only cover the house very nicely.
AllAmericanFiveRadio 3 years ago
is RF-energy a kind of alternating current?
semnopithecus2 3 years ago
Yes at high frequencies.
AllAmericanFiveRadio 3 years ago
Where is the link to the web site the autor is refering to ? I cannot find it.
pesdomaci 3 years ago
Upper right (more info)
AllAmericanFiveRadio 3 years ago
Thank you, I found it.
pesdomaci 3 years ago
You're welcome.
AllAmericanFiveRadio 3 years ago
Where is the link to web site the autor is refering to ? I cannot find it.
pesdomaci 3 years ago
(more info)
AllAmericanFiveRadio 3 years ago
Nice job. I like the way you adapted the design to use available parts. Also, the home-made coils show a lot of skill and resourcefulness.
eirpcalc 3 years ago
Limited recourses is more of a challenge. I think make the coils gets the circuit into the head better. My friend has made all kinds modifications. The oat box coils is so over done that most of the time you dont need an antenna. Thanks!
AllAmericanFiveRadio 3 years ago
I would think a 6L6 output tube would put out a lot of power. I have a Ramsey kit but when I got it it was missing a couple of parts. I aquired the missing parts but when I got to winding the ferrite beads I got stuck. The instructions in the book are worded quite strange or at least I found it to be and I got frustrated and set it aside. I might look into it again tomorrow. GK
HD7100 3 years ago
OH it can produce more power, but Im not volunteering that information, lol. Thanks.
AllAmericanFiveRadio 3 years ago
What can I do with a AM Transmitter? How far will the signal go?
Steelcowboy007 3 years ago
I use it to broadcast any programming I want to my AM radios. It covers the house nicely.
AllAmericanFiveRadio 3 years ago
& probly the guy next door too,lol
Kcy101 3 years ago
Why a 6SA7 for an oscillator tube when you aren't using most of the grids? I'd probably use a 6AK5, or 6SJ7 for an octal type.
n0bst 3 years ago
When I decided to make the transmitter the only thing I bought was the aluminum box. I use what my friend had the most of in his stock.
AllAmericanFiveRadio 3 years ago
Great great. I want to be an inventor someday. I would like to know the materials you've use in making that thing. And another one, if you have other invention please send me a message.
vladimirkafm 3 years ago
Well, it's not really an invention. I've been building these since High School, in many variations. All the parts are labeled on the wiring diagram and in the pictures, located on the web link in the "More info" for this video. What influenced this design was the parts I had in stock.
AllAmericanFiveRadio 3 years ago
COOL VIDEO AllAmericanFiveRadio!
Thanx!
sOnarPL 3 years ago
Thanks. This project has been fun and very useful.
AllAmericanFiveRadio 3 years ago
Nice project. I will subscribe in hope of learning things.
trisoctehedron 3 years ago
Thanks, it was a fun project, building AM transmitter is more difficult to build than other some other projects. But it was well worth the aggravation.
AllAmericanFiveRadio 3 years ago
Awsome!!! I recently got back into radio, I already had some AA5's, now pre war wood sets. Thank You for all the info, I want to transmit various programming to the old survivors. (RCA 55X, Philco 90, Atwater Kent 90, Philco 38-12, Packard Bell 46D). P.S. I loved the prodution of Your vid, it sounded great with Your vocals + the backround music!
drippinglass 3 years ago
Thanks! I use the transmitter quite a lot. I have lots and lots of old radio programs.
AllAmericanFiveRadio 3 years ago
Even with the limitations of YouTube audio this sounds great. I like the idea of a tube TX tube vintage tube RXs. I'm using the Ramsey AM-1 which works, but the quality isn't all that great. I did make it crystal controlled which kept it from drifting all over the place. How's the drift (afetr warm-up) on your design?
MarksCoffeehouse 3 years ago
Thanks.
It's very stable. I used new (NOS) tubes which helps the stability and the fidelity. Of course being a tube circuit, they do drift, but this circuit is so stable that I have never notice any drift. One YouTuber has built one, CameramanLink, he is test his now. He has had a few problems and that to be expected, building a transmitter is a little hard to execute than some other circuits. I think he is going to make a video about his transmitter.
AllAmericanFiveRadio 3 years ago
Very nice video and I'm sure many with profit from it.
To date I've waisted about $300 buying kits and so far none worked. My last try was the K-488 unit.
I purchased a wired unit off ebay but the seller never sent it.
So I continue my hopeless search for a good AM transmitter for my antique radios.
Does anybody out there sell good AM transmitters to those who don't want to learn electronics?
biggestdigger 3 years ago
You have stated the problem perfectly. I have one K-488 built and another still in the box. I'm only interested in transmitter to my radios in the house with good quality audio. I have made sure by testing and careful measuring with a field strength meter that this transmitter can not interfere with the neighbors or any AM commercial stations.
Ramsey makes a solid state Professional AM Transmitter Kit AM25, that may be what you are looking for. Just Google "Ramsey AM25".
AllAmericanFiveRadio 3 years ago
Houses have many sizes and I really don't know what's the length of your house ;)I would like to ask you if this transmitter could transmit about 15 metres (16 yards - 49 feet) or 30 metres (32 yards - 98 feet) away in radius ? Sorry for comment duplication because it's a mouse click accident.
Thank you !
joeypc87 3 years ago
With the antenna that I'm using now, it limits the range nicely to about 50 feet. AM wave propagation is all about ground fields and large tuned antenna systems. And I'm not doing either with my short un-tuned wire antenna.
AllAmericanFiveRadio 3 years ago
My purpose is to transmit to the radios in my house this good quality audio.
If you're planning on running your own AM radio station the Ramsey kit model AM25 may suit your needs. Many schools and low power AM broadcasters use this transmitter. And in the USA low power AM broadcasters are required to have a license. The end user is responsible for complying with all FCC rules & regulations within the US, or any regulations of their respective governing body.
AllAmericanFiveRadio 3 years ago
Uhm... What's the output power of this AM transmitter ?
joeypc87 3 years ago
It's just enough power to cover the house in good quality AM RF audio.
AllAmericanFiveRadio 3 years ago
this is mad nice but can you make a fm transmitter
brand00000 3 years ago
Yes I have. But the FM transmitter I use today is a Ramsey Kit model FM10C. It is Stereo and it works very well. The quality of the audio is very good and so is the stereo separation. The signal travels a surprising distance with just a small antenna.
AllAmericanFiveRadio 3 years ago
Fantastic AM Transmitter ! Um... But I would like to ask if you had a transistorized version ?
Thank you !
joeypc87 3 years ago
Hey joeypc87,
I have had requites for a solid state AM transmitter literally from around the world. So I have started researching the availability of parts that everyone can get, or make on their own. I'm working on it!!
Rick
AllAmericanFiveRadio 3 years ago
Feel joy when i see this! Absolutely amazing that there are still people in the world that have the capacities to develop and build these kind of schematics with tubes. Did it take much time to build it?
radioam232 3 years ago
THANKS!! I really appreciate that. I used this as a learning device for a younger friend. So speed was not the goal. He is still modifying it by the way. I have been building transmitters and receivers and all kinds of stuff since High School. And I'm still fascinated by it all and I don't think that will change. I'm sure you get the same satisfaction that I do when I fix a radio or design a circuit and it works perfect. Thanks again.
AllAmericanFiveRadio 3 years ago
Fantastic! Can we get that diagram with transistors in place of the tubes? :)
I'd like to build both a transistor and tube version when I get the time. What a great way to listen to some of my old mp3's of The Carpenters and Roger Whittaker.
sidebander 3 years ago
I really don't know how many transmitter circuits I have built and experimented with. I have built many transistor transmitters also. Some that will transmit AM & FM simultaneously and with a very wide tuning range.
AllAmericanFiveRadio 3 years ago
cool...I also had one years ago ..I also build them out of old fm tube radios and make a fm transmitter that will broadcast well ..enjoyed the vid a lot
arvinwynn 3 years ago
I have built a few FM transmitters and they perform amazing well if you have line of sight. Thanks
AllAmericanFiveRadio 3 years ago
Rick... This would be great to play old time radio programs into an old tube radio. I can imagine a big console radio in the living room playing, "The Shadow".
Nice job...
Ron
Ronbob59 3 years ago
Hey Ron,
Its fun listening to any thing you want. I do have a lot of old radios and I also rebroadcast web radio, sounds pretty good. There's real no limit.
Rick
AllAmericanFiveRadio 3 years ago
I guess I need one of these too! I have the antique electronics catalog.
coolbluelights 3 years ago
YES YOU DO!!! I use it all the time. This is one of the more useful projects I have done. I'm also adding information on the link. There's some deference's between the picture and the wiring diagram. I completed work on this about four years ago and probably got tired of making updates. Plus I was still working on the book.
AllAmericanFiveRadio 3 years ago
It would be nice to build one, very neat.
CassetteMaster 3 years ago
It's a fun and very useful project. You need one of these!
AllAmericanFiveRadio 3 years ago
That sounded great. Definitely something I'd like to build eventually :)
speedyc395 3 years ago
You need one of these too!! Gather the parts while there easy to get.
AllAmericanFiveRadio 3 years ago
Rick,
At last I get to see it. So cool. Gotta have one. It'll be my first-up project after finishing the two radios that are now in the hopper. Where did you obtain the chassis? Great video.
P.S. You have a knack for making a body envious.
John
joernone 3 years ago
Hey John,
You need one of these!! The audio is much better than in the video. I believe that everything is going to the WEB, EVEYTHING! If I want to listen to KMOX in St. Louis MO I just click on the icon on my desktop.
Rick
AllAmericanFiveRadio 3 years ago
I bought the aluminum box from Antique Electronic Supply.
tubesandmoreDOTcom/
AllAmericanFiveRadio 3 years ago
I think I'm going to go the home brew route. I've tried a couple of the AM transmitter commercial kits, and I'm not real happy with the results.
Hammondlover2 3 years ago
I actually have one of those kits still in the box, I'll probable use the parts for something else. I have thoroughly tested this transmitter's performance and it covers the house very nicely and does not interfere with the neighbors. And I think its neat looking.
AllAmericanFiveRadio 3 years ago
Very fast, my first one I built was when I was in High School. I over powered it so much that the plate of the 6L6 glowed cherry red, neat thing in HS. This one I was using to help one of my younger friends to learn with. I'm glad we took our time because he had a lot of good questions that influents the design. He is still modifying it. If you have all the parts you could build this in a day.
AllAmericanFiveRadio 3 years ago
i am in highschool right now..actuall taking a radio course and i want to get one of these for a hobby..well make it.
101popster 2 years ago
Take you time and good luck.
AllAmericanFiveRadio 2 years ago
Can you do 115% overmod like a broadcast AM transmitter? If so, it should have a range of six to seven miles, even when run as a Part 15 setup.
douro20 3 years ago
One station that I work has a four antenna array. If I were to borrow that system and connect this little transmitter to that array and tune it to the antenna array's frequency. The carrier would travel several miles with or without modulation.
AllAmericanFiveRadio 3 years ago
ok..i have been lookin for a wway to broadcast a longer range than 500 feet on an am transmitter while staying legal...i really dont want to get in trouble. could u exlpain this overmod thing to me? six-7 miles is sick!
101popster 2 years ago
You can get pretty far using a good ground field and a tuned antenna system. You will get into big time trouble if you try an compete with a commercial station or cause interference in your neighborhood.
AllAmericanFiveRadio 2 years ago
I'll have to try building this! Thanks for including the coil form data on the schematic (the coils are even based on common items like a toilet roll or quaker oats can!)
retrochad 3 years ago
Also the wire is from Radio Shack. I thought that in the future it would be more important to have a good Transmitter. Everything is going to the web and I want to be able to use my radios. I think you will be very pleased with the performance of this transmitter. A good friend, who has been a broadcast engineer since dippers, was surprised at the audio quality. And he tells it the way it is.
AllAmericanFiveRadio 3 years ago
WOW!!!!! This is amazing!!!!! The sound quality is great!!!! Did you design this circuit? This completely blows away the crappy one I made before. I'm definetely trying one of these! Great job!
CameramanLink 3 years ago
Yes, it is my design. Believe me it is definitely worth the effort to build one of these. This is a good basic design and easily modified. You can download the information from the URL link in the "About This Video." Let know how you progress with this project. I use the transmitter all the time. And THANKS!!
AllAmericanFiveRadio 3 years ago