Make FM transmitter 300 times more powerful
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- čas přidán 19. 02. 2022
- In this video i show you how to make a simple 9mw FM transmitter 300 times more powerful using a very cheap RF amplifier.
Buy our 1 mile UHF transmitter at: www.bug-transmitter.com - Věda a technologie
Had this idea a while ago never got round to putting it together.. great stuff!❤️😎👍
After long long time legend is back with new video pls keep posting your videos
wow great to see ya making videos again. loved you radio on a two penny piece videos.. when i saw the little blue dot by your channel in my subs not to long back i was so happy. GLAD YOUR BACK... : )
P.S. this one's going in my Favourite's alongside your many other videos. also i made the one you had on top of the 9V battery,(the little transmitter) worked like a charm, was well chuffed. still have it around in one of my parts drawers must pull it out again. : )
Fascinating tweaking! Very nice close-up shots. Looks like a fun experiment! ~
Very awesome looking transmitter. Cheers!
This construction is a very nice idea. I also wanted to make an output amplifier for the transmitter like the one you have. But I hesitated because its output is very small and I would need extra amplifier stages to get an output power of 1-2 watts at most, which is the power I need.
Because all these Chinese constructions, apart from being sensitive and easily damaged, also have the problem of harmonics. But I believe that with enough experimentation and placing a LC filter between transmitter and amplifier, but also with placing an amplifier matching circuit with the antenna and a well calculated bandpass filter before the antenna there will be no problem. The low cost, around 15 euros of the entire construction, makes it a tempting proposition for every amateur or hobbyist. Thanks for the presentation
This is like fitting a turbocharger to a Moped ! I Love it 👍😁
Brilliant , been looking for a decent FM transmitter that i can run off 18v makita batteries using the makita usb adapter . the Belkin tunecast 2 that i'm using has a short range even with an aerial mod , just ordered the DSP FLL FM transmitter and hoping this will be the answer 👍
Thank you for the vid ! I have a question, what kind of antenna should I hook up to the RF out side ? Is there a certain type, maybe a name ?
would like to see you build a DIY low pass filter for stuff like this. would like to see your take on one.. hope you consider this. ; )
Nice set up...
Thanks that was great!
Good idea, I will give it a try.
I have a question, does this transmitter works on a VHF signal to an old television? I have a collection of televisions and would like a strong signal to reach everywhere in the house.
Friend, could you help me with the description of the U2 component in the circuit, please?
Because mine burned this transistor when I changed the frequency on my nwdz rf pa v2.0 and I wanted to fix the problem.
Is there anything else I can replace?
I checked the link you have listed, only see a 430+ MHz transmitter listed. Nice, how does one change frequencies on that unit? If frequency agile by user might be interested.
Do you have a source for the FM and power amp module?
can you do a video on calculating filter networks?
Be great if you can show us how to make an antenna as the subject of an upcoming video.
Interesting addition...
What is the range? I'm curious to built one, I want a 2km range and don't know where to start.
Can this power amplifier board work for fm receiver too?
TIP Its a bad idea to transmit with more than a few watts in the city or highly populated residential areas as the transmitter can overload everyone radio receiver in the immediate area, this will lead to complaints and swift crack down, so be warned. Its 1W max in dense areas or 10 ~ a few hundred Watts in rural , and do not jam or interfere with a licensed broadcaster. Do tests with a fm radio reception around the TX site to make sure all is ok. Need a spectrum analyzer too ensure its not splattering other bands.
You can add output filter cans to transmitters that eliminate everything except the frequency you need however you need a tracking generator to set up the filters but those have come down in price for the Chinese units. If you are passing only your frequency you are good to go. If you want to use in an urban environment one will need to add a transmitter circulator an appropriate dummy load before the filter cans. Any stray RF that gets past the filters and tries to get back to the transmitter, will be shunted to a dummy load. This helps prevent intermodulation when an external signal makes it past the filters and gets into the transmitter creating harmonic frequencies which might fall on most any other frequencies including public safety and business frequencies. Inter mod gets many burned by regulatory agencies when their signals wind up in the wrong place.
hi ,whats the consumption with 2w out ,withouth input signal ?
Im need one like this for my radio station is not super strong signal output im need the amplifier
can u test the usb audio using OTG to phone? does it detect as usb audio device on android? thankyou.
This will be more usefull, so u dont need to connect the line cable, power and audio signal came from the usb itself, using phone/pc as source
which second i could listen to sound sample, please?
Hi will this unit work on the ebay type fm transmitter rated at 1watt/ 7 watt? Any reply appreciated cheers from Australia ❤
What is the range at 3w?
Question: At 11:34 it shows the rf out from the xtr going to the rf out of the 3w module. Shouldn't that be going to the rf in?
Yeah
Apparently that was just a last minute "extra footage" shot, and he didn't notice. Obviously he had it right when testing the power output. Still, funny.
Gonna build that to 😁
I hope u still in good health.you back too long time later ,from the beginning of the Chanel you still same :)
I'm quite ignorant about electronics, but my question is if any of this could be used to build a very powerful Bluetooth transmitter. Thanks for the video!
Considering that in the end you connected your transmitter to the amplifier output (11:08), I guess your next video will be about how to run an amplifier in reverse in order to use it as an attenuator ;-)
Is the designation of U1 and U2 readable or was it sanded off? It would be interesting to know the types.
Lol, I did not see that, it was a last minute video clip, that's why it was not running.
@@dazaro3 BOUGHT A 13 WATT FM TRANSMITTER A YEAR AGO AND USED A 3 LEAD POLE ANTENNA AND IT BROADCASTED ALMOST 7 MILES . NOW I CAN'T EVEN GET A SIGNAL AROUND THE CORNER. ANY SUGESTIONS ? SHOULD I SWITCH TO A DIPOLE ANTENNA ? IS IT MY RADIO.?
@@mw10259 you probably blew the output transistor. Bad coax, or bad antenna is the reason. Replace the blown transistor. It should be rd15hvf1 i guess. Don't buy from china or (and) with low prices. Minimum 10$ for 1 transistor or you will get fakes. Use RG58 for lengths under 5 meter. Use low loss coax for lengths > than 5 meter such as rg213/214/lmr400.
. Don't use 75ohm coax, it will blow your transistor again. Be aware that blown RF mosfets shows as working on most transistor testers. Check your coax (shield and center conductor) for open/short circuit. Check that the antenna is rated for the power you use, is 50ohm and is not damaged in any way. And get a swr meter to check your swr. Over 2.0:1 swr is bad. 1.50 is good. Under 1.50 is perferct. Hope it helped you
Good Experiment
You always have to filter the output so as not to interfere everywhere.
Cool Video, was wondering how much watts would I need to transmit approx 50 miles? and what do you think it would cost me?
+100W TX, with very big antenna mast, very low loss coax(expensive as hell) etc... costs +10K$, or you can do it yourself but you will 100% end up being caught.
50 miles is too much i think, but its possible to make
I have a half wave dipole being fed by an homemade 30W amp. BLY93H as output stage. The antenn is about 15m up in the air. It will transmit easily over 15km
@@NitrobenzeneNO3 can you share your schematics with me?
@@slender1357 Nothing to share really, just a simple class C amp construction with NPN BJT. I get around 1,3W from my modulator which gives roughly 30W out.
El puro transmisor antes de la etapa de amplificación cuantos miliwatts proporciona??
100mw
@@klausbrandt5064 Is 10mW or less.The needle of YP-150Z dummy load-wattmeter did not move. From the same RF amplifier the one was burned and the second nothing.Only with 8oomW input, gave in the output 100mW. Result: Loss of time on shitty items.
I have an amp like that. Why does it get so damn hot?
Can I buy this from India?
ive got a 50w fm amp i havent tested yet :P :D
Side note: The amplifier will get very hot, if it doesn't. it's broken. Just got it today, connected it to my power supply, it wasn't drawing any current. Fixed the capacitor that was out of place, and the board started smoking.
Should i get a fan for it
@@Ezzikmc You probably should. I ended up buying a QN8066 transmitter off ali express. It cost $30, but its infinitely better than this one. I got mine broadcasting at over 10 Watts.
i have a question. I have the same fm transmitter. On some songs it will hiss on the high notes. Do you have any idea how i can fix that? will one these rf amplifiers help?
I had the same problem, its currently running in stereo, on back of transmitter solder 2 little pins or sometimes no pins anyway solder them together and now transmitter will run in mono and the transmitter should sound a lot better.
@@dazaro3 Thanks that helped alot! the sound is much better.
@@dazaro3 Well, stereo coders must have low pass filter 15 kHz in audio input. That is because FM Stereo multiplex uses 19 kHz pilot tone to start stereo decoding in a receiver. That pilot tone is 8-12 % of the maximal modulation sound. Thus it can be severely jammed by 19 kHz sounds in modulation (sound you want to transmitt). Try this simple solution: Use only 96 kbps MP3 sound files as their highest freqency does not go above 15 kHz. Even 128 kbps can sound good. If you want to transmitt sound from some studio, make simple RC 15 kHz filter, or use equaliser and press down all filters for frequencies above 15 kHz before transmitter input,....
I bought a cheap Chinese version of EBay, for under 20.00 bucks..
The strangest thing, I use one in the car, and one in the house..
When I walk arround in a 6 to 8 block circle, I easily can pick up my mussic from home...
It's not powerful enough to over ride broadcast FM stations...
But I'm amazed how my old anolog FM tuner s pick up off my cd player or smartphone..
I have no idea on the wattage, built in battery that charges with a type C cell ph charger..
I even had the idea of using two transmitters at the same time, and the range doubled to a insane range, but not very audible, as the feed back was bad, even at 20 feet distance from each other...
Just a spliter cable from the head ph jack..
I'm using a empty FM frequency not in in use to stay anonymous with the neighbour's...
👍👍👍👍👍
*FCC Joined the chat*
without 3 stages Low Pass Filter at the end it will kill airband communication in ~500km around. it's mean big problems 4 jammer-boys. nice setup but with LPF only. cheers
Why didn't you put subtitles for all languages?
No filtering ! Add a low pass filter.
12 volts/1.6 Amp input, that is 19.2 Watt input for 2 Watt output. Really???
the 100Mhz is hidden in a mess of harmonics !!, , so dont even try to SWR in an antenna, , ,
Rang kitna
Those little transmitters sound nice to me but should not be amplified as they output unwanted frequencies including close to the wanted frequency. So a low pass filter wont get rid of those. This is what gets pirates a bad reputation.
ha, , , 1 1\2 mile on 9mw, is that even possible, , , Have you got a NASA radio telescope !!, , ,lol
The RF amplifiers 3W are useless most of them. I imported two and none is good. It's a big scam.
Arduino project देखना हे आप से( HINDI) sir
Just worked it out, You must have got it wrong, with your 1.5 mile for 9mw, and using the rule, that it will take four times the power to double the transmission, you get 24 miles at just 2.3 watt, when it should be 80+ watts, 9mw will go about as far as your outside toilet, , ha :-
Miles \ Power
1.5 = 9mw
3 = 36mw
6 = 144mw
12 = 576mw
24 = 2304mw
But i think there are many variables, the main 4 are, 1) the height of the antenna allowing a greater line of sight, 2) is the antenna directional, both transmit and recieve, 3) the sensitivity of the reciever, 4) atmospheric conditions, , the VHF 100mhz 3 meter band has very little skip, but i wont rule it out, cos with certain conditions like a high pressure, i remember the old analouge 471-847mhz UHF TV frequencys skipping, and even picking up scandinavian TV, , , ha
This is illegal isn’t it?
Yes
Very bad idea. It be increase the range, but these tiny micro transmitters are not meant to be amplified because their signal output isn't very clean and will cause interference with all kinds of spurs and harmonics and wipe out other stations.
FCC
Yes fcc has no job now a days
UK so FCC has no jurisdiction.
@@simonpeggboard4004 Yep, noticed that (kinda hard not to notice the accent; my partner just came in from the other room saying "What language are you listening to? It sounds almost like English sometimes." :-).
How about the viewers who may follow this path, tho? Of course he says to follow local laws....