Amazing it worked so long. So this mosfet is probably stable at the higher wattage than it's rated.

@@spectra-man Most probably. It's running at 100% power capacity.

By the way, you forgot to do the "Burn Test" 😂

What kind of range can you get with an outside antenna up about 30 feet running 30 watts?

@@mattfarhat4820 I am using my own built circular antenna. Point to point, with a good receiver, it can go at 15kms. It can do more if antenna is installed higher and away from obstructions.

you all prolly dont give a shit but does anybody know of a method to log back into an instagram account..? I stupidly forgot the account password. I appreciate any tips you can give me

@Tristan John instablaster =)

@Yael Jad i really appreciate your reply. I got to the site through google and Im trying it out now. Seems to take a while so I will reply here later when my account password hopefully is recovered.

@Yael Jad it did the trick and I finally got access to my account again. Im so happy! Thanks so much you really help me out !

@Tristan John you are welcome :D

Good point. I can try to check it, but I probably won't make another video for just that. My spectrum analyzer doesn't have a tracking gen output and I don't have a network analyzer. That's something I need to buy.

No. Maybe for a short time, but this transistor is already being used at double the power it's rated for.

May be RF chip burnt.

May be RF amplifier chip burnt. My St 7c is also giving less power.

@@TheSudiptheory Thanks a lot.

So you probably saw me on TI :) At some point I will get a LimeSDR mini and I will attempt to use it to send data at high speed on VHF low band. Nobody ever sends data fast at ~70 MHz, but this is an optimal band for coverage and more reliable than HF. I will use QAM64. I want to make it so you can send an ethernet connection directly through the radio and send at about 1MB/s. It may be possible with GNU radio to accomplish this. It would be excellent for sending fast internet to rural areas with a very large coverage and the TV band is empty now. Probably not legal in the US, but maybe elsewhere.

@@spectra-man keep us posted ! Cool idea .

I've done IBOC NRSC5 using a HackRF one. Both AM and FM. SDRs are a blast.

I know it's been a long time. I don't do much radio stuff currently, but I may begin again sometime. To try to answer the question: You said SWR is okay, is that measured on the TX or another meter? Cause maybe the TX is giving wrong readings. The other possibility is that it's outputting spurs that are far off the antenna resonant frequency. Either way, you must have just gotten unlucky.

For me it was a case of changing the power supply - went from the brick laptop type supply to one of those alluminium ones with the little screw on it to adjust power. That fixed it and has been ok for a year until recently when my power jack started to burn for unknown reasons so I had to take that off and just soldered the power cable directly to the board from the power supply.

@@TheOne18263 Yes, I just bought one of those power supplies also. I'll be testing it in the next few days.

@@bruceeckersley957 Good luck! It's a pretty decent bit of kit I love mine! I have it pumping some days in the week and all Fridays on full power. Get the processing right and compression and it can give good volume and amazing sound quality much better than community stations here in the UK and I have RDS blasting out as well. It does run very hot though but that's probably all the electro, house and trance I have booming out of it 👅😂😂

@@bruceeckersley957 Try to get a meanwell or if you need cheap, a velika from aliexpress: velika.aliexpress.com/store/2655036 On the other hand, the no name chinese supplies are not reliable. And at the wattage you require, a more official one won't cost much.

I'm 90% sure it's for USB flash memory with music stored on it. It's not for transmitter control or RDS.

@@spectra-man nooo! I feel like something is missing when operating a pirate station without an RDS. It would be great if the transmitter had shuffle mode for music stored in the USB. You could drop the transmitting site anywhere.

Did you tune the dipole? Maybe I have to make a video on antenna tuning? But I don't want to be too basic. You need an MFJ or other antenna/SWR analyzer.

Sorry, I do not, but how are you so sure that the microprocessor is broken. Maybe it's the screen? I've had these type of screens go bad sometimes. Did something happen to the transmitter that would have caused this? Too much voltage? Cause there's a chance other things might be damaged too and you may never find each thing that is broken. In that case, you just have to buy a new one.

.... Oh, yeah. I forgot to ask if it still transmits despite the screen not working? Cause if yes, then it's not the pic chip.

There is a line input, not mic input. So to use with a mic, you should have a mixer and use with the line input. This is a more proper way anyway. TX's that have a pink mic jack are crappy anyway.

It's pretty good, better than BH chip. With an audio processor, it will sound like a professional station. Without one, it'll be a bit quieter. But be careful about trying to make it as loud as possible cause you might overmodulate past 75kHz.

@@spectra-man is it louder than the 7W QN8066 one? Does it have a MPX output?

@@bioskahabinivous9906 Should be the same. I did not find it to be quiet though.

This is a great comment and I doubt the OP will have issue. I wondered about the same with my devices I designed. It really does help to inject audio and see how the test transmitter carries the information over. Lots of flaws can be detected easily with AM using basic tools like oscilloscopes and such, but FM is still a different ballpark. There is always the chance that odd bits of audio cause deviation artifacts because of odd artifacts in PCB design or even RF output components and filteriing. I'm not even sure how to test some of this stuff. I just know that FM carries with it its own beast of gremlins to diagnose before something hits design phase, even if that means a home radio station. Now aside from that, I really want all people to build a simple FM bug for fun. Maybe some of them will bite and realize what it can do if they have the right stuff ;) Pirate radio is fun, don't let them dictate what you can and can not do if you know more then them. We are free. Free Radio.

Yes, I have tested the spectrum while modulating, but I didn't make a video on it because of music copyright and I need a high quality FM receiver to use with 3.5mm connector to record from; I want people to hear what they are seeing in the analyzer. The best one I have is an old AM stereo walkman. Please recommend to me a super HiFi FM receiver that's not crazy expensive. They all seem to use all in one chips these days. In terms of the spectrum while modulating: It's not ideal on this transmitter, but not too bad. Generally, it stays under 75khz, but occasionally I see peaks up to 85 - 95khz. When using an audio processor, this is improved though. If you set it low enough that it never exceeds 75, then it's a little bit more quiet than other stations, but I can get it to be the same if it pops up to 85 every now and again. I'm currently working on another video where I demonstrate a cheap high quality optimod. I will test it with this transmitter and then later test it with a real pro transmitter. It's nice to have it good, just for the sake of goodness LOL, but I've come to find that the spectral requirements for transmitters are way too strict. -45dBc doesn't have much real world effect. The noise is 32 thousand times lower meaning it's only 2mW at the worst.

@@kenzingzong6704 It's interesting how even a small homemade FM bug will have less noise than one of these TX chips. I know why though. What I don't understand is why the Chinese don't use an integrated VCO chip. Yeah, it wouldn't have stereo, but would otherwise be way more pure. I don't even think it would really cost more. Yes, more components, but the descrete components are very cheap, so overall, I'm not sure they are actually saving money by using these chips. Not one cheaper Chinese transmitter has a real VCO or even an IC module that's a VCO. It's a shame, but it does keep people like PCS in business.

I said in the video: If you use above like 103 - 108 MHz, then get the 30W. If you use less than 103, 104, then buy the 60W.

It's less than $100. It comes from aliexpress only, not ebay: www.aliexpress.com/item/4000055611009.html

Did you see the spectrum? No it doesn't.

@@spectra-man it has some spurs and second carrier though

@@MiiMaker No, it doesn't. Are you talking about this transmitter or your own transmitter?

@@spectra-man my transmitter. The one that look like this kzfaq.info/get/bejne/h6ilm5Sgrs_bpmQ.html There are more than two carriers :(

Transistor is talked about in the video RD35HUP2. Did you not see it? No schematic. This is a pre-built Chinese.

@@spectra-man Thanks Sorry, I couldn't read it . What about the input power ?

QN8066

Sorry for the delay. Well, within 30-50 feet it might, but that's mostly because the receiver is being overloaded. Did you test how far the 30W covered them up?

@@spectra-man Thank you for getting back to me ☺ I had the old 30 watter and it would wipe out pretty much the whole Road i used to live on which was a cul desac / close and just a little beyond. Meaning all 12 neighbours and the ones from neighbouring roads could not get fm signal

@@TheOne18263 It was probably the KT0803L model. Was it the one that looked like the earlier model in my other video? The one with the green screen instead of the square screen on the yellow PCB.

@@spectra-man Yes yes that's the one. The one with the green screen.

RF energy at these frequencies is just light waves. It's no more harmful than the sun. Microwave and above is questionable, however. But of course, don't stand closer than a couple feet and don't touch it.

See this: kzfaq.info/get/bejne/rK-qddap173DmmQ.html

No schematic. There is a schematic for the RD70 from free radio berkeley (rf emporium). Just email Stefan Dunifer (SP?). Keep in mind the RD70 is not a very good transistor though. It requires at least 10W of drive to make about 65W. That's why they used this more rare transistor on this design cause they only need to push a couple watts for max power.

@@spectra-man okay thanks

Yes, might be correct, but I can't find a barrel connector of this size with thicker wires. I should just solder some wires on. I don't know why they picked this type of connector for so much power. The jack itself gets pretty warm.

I don't condone the use of these transmitters for illegal purposes. FM is always easy to find, but it also depends on city vs rural location. This transmitter is not particularly bad though especially if there is not a station +-100 kHz. AM is always the safest.

Sorry for the big delay. This is not my daily account. It's probably going to be ~55 watts. It could go up to 15 miles on flat ground with no buildings, but in a city or in the mountains, it's going to be less. No way to say how much less cause it depends on antenna height and location.

But anyway bro, there's one way to find out exactly. Create a free account at Nautel RF Toolkit. Once you make the account, then you can use the radio coverage tool. In there, you put how many watts, the type and height of antenna and then it will give you a google maps with the coverage pattern. If you can't figure it out, you can tell me what city ur in, antenna, height and I can send you an image with the coverage.

www.aliexpress.com/item/4000055611009.html If that link doesn't work in your country, then just type "70W fm transmitter" or "50W" into aliexpress.

Search Aliexpress.

Hey radiomaster. BTW, this guy makes the best transmitter in the world - better than PCS, but more expensive, as expected.

I know my channel is small, but I can review something if you want. I have association with a big 500K channel also, but not sure about doing a video there.

Hey may be one day you can review a Radio Master 😜👌

No, QN8066. Didn't I say it in the vid? If not, that was a dumb oversight by me cause I always knew this.

Which one is a good sound? Using BH1414K IC or this QN8086 IC?

Sorry for the late response, it's not my main account. I am NOT using crokodile clips to power this. It looks like I am because I have some hooked up for something else. Please watch and you will see the two thicker black wires coming down from under the clips on the power supply. It's directly wired to power supply. I do agree however, that even this is maybe not good enough cause it's using the standard barrel connector on the transmitter which isn't meant to handle this much, but that's what the Chinese put in there, so I used it cause I thought that's how most people would use it.

SO what?

Might be a good idea, but will need to supply 26 + 12V and separate the voltage. I really like the AFT05MP075N. It's the best 12V mosfet, but it won't fit in this amplifier. Somebody should make a new design with that one. 65:1 SWR tolerance.

1 free transmitter coming right up :)

последњи

Заказ фм передачи можна