Great video. I had a 190-200 watt FM transmitter when I lived in the NYC metro area and it served me very well for that area. Now that I moved to a very rural part of PA, I'm going to try to set up a KW or so AM station this summer. I have an 90 foot tower for my other antennas and I'm going to experiment with shunt-feeding the tower and see how that works. I see lots of work and ground radials in my future. I'd like to see a little more about the coverage of your AM set-up one day. Thanks for posting 👍🏼
That sounds amazing. I'd like to hear the details if you do the AM. Sounds like it could be better than mine and mine goes too far :) Being on a clear frequency is what helps the most.
Today I bought a new version of this transmitter on Aliexpress and it has IC BH1414K. With delivery to Russia it cost less than $100 in rubles. I will wait impatiently to receive it.
Some great content here. I'm hoping that the Chinese will start offering more AM band transmitters as the broadcasters are disappearing quite quickly here.
Yeah, it's interesting that the Chinese only have one 100mW AM kit. That's it - only one. Whereas they have hundreds or more FM transmitters. I understand there is probably a bigger market for FM, but not that much bigger. It would probably hurt the Greek guys though cause they are the only ones that offer big AM transmitters, so maybe it's good.
@@spectra-man I got the Chinese kit and the harmonics are desperate though I was able to clean if up a good bit with a LPF. Keep up the good work here, you have nowhere near enough subscribers.
I was missing your video's. Can you try out the PCS Electronics CyberMaxFM+ SE+ V3 15W STEREO DSP + RDS transmitter. I'm very curious how they perform. We talked a lot about PCS.
I'd like to, yes, but I don't want to keep buying so many transmitters unless I'm sure they will sell. Maybe he'd give me a discount to do a review. I'll see.
Thanks for the video. I've used quite a few of the RFNioRf low powered transmitters. They all use the BH chips and have horrible composite crud and pilot tone harmonics everywhere. Do you know if there are any boxed (
There are new type of Made in China low power transmitters. The model is called TZT EL 15S. There are 3 versions: 1,5W, 7W and 15 W. According to my information they are based on Quintech chips. So spectral clarity is better and harmonics are 10 dB lower than Rohm modulator chips. So they might be good excitters.
No, but I can tell his FM transmitters are the best on the planet. He showed the spectrum a while back. They are better than most professional ones and better than PCS.
@@spectra-man radio master for most customers is too expensive and I get rumors .. customers wait over one year (does not justify time / money / performance) ... PCS rumors is most problem with exciters .. PD850xx fall too often in 24h broadcasting... i believe thy overloaded... but for best buy still is PCS....
Yes, that should work, but I'm 90% sure the 7C uses a BNC connector not TNC. Maybe it's a different model you're looking at. Just make sure it really is that and not BNC.
@@spectra-man The manual said TNC. I looked on Google and it said RG174 can handle 17w at 1Ghz and I'm assuming 100mhz is less heat? Have you run any 12v transmitters at 13.8v?
@@BobSmith-nh6oi Better look at the back and confirm it's not BNC. You can just google an image of BNC to see. If it handles 17w at 1G, then it's perfectly fine. Yes, I run them at 13.8V often. Those RD mosfets should handle it just fine. But if you have the option to use less then do it cause it might last just a little longer. You won't notice a difference in range from 12 vs 13.8V.
@@allanmenezes2440 Olá tudo jóia, sim eu recebi aqui o ELE EL 15S, eu ainda não abri ele para conferir por dentro, o 7C eu já abri para trocar o cooler por um melhor e com menos ruído. A princípio eu percebi nesse modelo EL 15S uma qualidade de som mais limpo, deve ser um IC CHIP QN seja o 8007 ou seja o 8066 que acho mais provável ser. O modelo que veio para mim não tem 15 watts, ele vai de 1 watts 1,2 w até 6 a 8 watts, notei que de acordo com a frequência escolhida sua potência pode ser um pouco mais favorecida ou não. Isso ainda pode sofrer influência do cabo e antena externa que escolher, assim como ajustes para um bom ROE. Eu penso que fizemos uma boa compra, áudio limpo, estéreo com uma boa separação, e possui um MP3 integrado, veio um controle remoto que permite utilizar a entrada usb, com alterações de equalização. Ainda preciso fazer vários testes, mas a princípio eu gostei e acredito que você vá gostar também. A conexão com PC eu não encontrei software, mais por usb o PLL funciona, com potência reduzida, mais serve se quiser apenas um som ambiente dentro de sua casa. Vamos nos falando, espero que goste, abraço e bom fim de semana.
Sorry, I don't know how to measure. Do I just compare the 19khz level on spectrum with the carrier level and give percentage? But anyway, the BH1415F has a pilot level adjustment on pin 19. So if it was important, you could maybe change the component.
@@spectra-man there's a filter in the Transmitter that blocks frequencies past 15khz so I removed the pilot, pre emsphisis, and had to use rc correction in stereotool to get past 15,000 hz. The bass is very weak on this transmitter.
@@spectra-man According to the ITU regulations, 19 kHz pilot tone must be 8-10% of 75 kHz modulation. I have quite good experience with BH-14xx (Rohm) IC modulators in Chinese transmitters. But under some conditions: They are good for power rated 15-30 Watts. Especially (as you confirmed in one video) if is transmitter set 50-100% power. There can be some harmonics (300 and 600 kHz " + " and "- "adjacting your set frequency), but nothing serious. And I can confirm your claiming, one model 25W on lowest power setting have interferrence most likely RF leakage of OLED screen. Regarding "sound", my experrience is quite good. Even highest quality professional transmitters are having 50 Hz high pass filter. Rohm chips are having 15000 Hz low pass filter (guarding pilot tone), and deviation limiter what is really useful. Regardning stereo signal (Multiplex) sound, is not much worst compared to the professional transmitters I worked with. If your intention is to transmit studio produced program directly to the audio input, it must be sound processing. And if your intention is to use built in SD and USB player, sound must be processed (EQ and multiband compression) before you transfer the recording to the medium. FM Stereo broadcasting even in the latest digitaly processed MPX encoders, can never be "Hi-Fi". Limitations are in the principle, and stereo signal must be 4-5 times stronger than mono in order to have equal signal to noise ratio.Many FM Stereo DX-ers, enjoy this specific not audio purist sound,...
Sure. It's decent for that cause of the variable power output. Try a 150W amp from ebay. The blue board with the round MRF177 or BLF177 might be good or a better one from pcs electronics.
@@yungman3033 No, of course not. Do you understand you have to make sure the input wattage is correct? The amps page will almost always tell you how many watts or mW is needed to drive the amp. It sounds like you have no experience with electronics, so be very smart and make sure you don't damage the amp.
@@yungman3033 Separate amp for 15 or 25W: That would be a bit more challenging because today, no amps require that much input power. So you'd have to turn down the TX or add an attenuator, but with your knowledge, that is not possible for you. So if you want to drive amp, buy a transmitter like this one in the video.
Depends on location. Flat or hills/mountains? If flat and not city, maybe 9 km. City = 3 km. This is not always correct cause it depends on the height of antenna.
Thanks for the reply! I was waiting for 3 months for the mini radio master! I 570 euro no power supply! no print for the modulatie! And before I send him the money I asked him is de transmitter plug and play! he see of course he is ready! No I must buy de audio normalizer 250 euro and the power supply is 55 euro, I feel a little bit repped of. And he no that! He played a game in the whit me! 😔😔😔
Yeah, his price is a little too high for what he offers. It's very barebones. At the same time, he does the work that normally a team of engineers would do at a business.
@@spectra-man yes, I think you are richt, the little transmitter is a piece of art! I buy from him the digital audio normalizer! The price exstra is 250 euro! 😑👍
I have a challenge for you young man since you know what's wrong with them after you've made tests on them put in some circuits where they will improve and do what they're supposed to do let's see how much of a genius that you are.
Great video. I had a 190-200 watt FM transmitter when I lived in the NYC metro area and it served me very well for that area.
Now that I moved to a very rural part of PA, I'm going to try to set up a KW or so AM station this summer. I have an 90 foot tower for my other antennas and I'm going to experiment with shunt-feeding the tower and see how that works. I see lots of work and ground radials in my future.
I'd like to see a little more about the coverage of your AM set-up one day.
Thanks for posting 👍🏼
That sounds amazing. I'd like to hear the details if you do the AM. Sounds like it could be better than mine and mine goes too far :) Being on a clear frequency is what helps the most.
Today I bought a new version of this transmitter on Aliexpress and it has IC BH1414K. With delivery to Russia it cost less than $100 in rubles. I will wait impatiently to receive it.
nice set up
Some great content here. I'm hoping that the Chinese will start offering more AM band transmitters as the broadcasters are disappearing quite quickly here.
Yeah, it's interesting that the Chinese only have one 100mW AM kit. That's it - only one. Whereas they have hundreds or more FM transmitters. I understand there is probably a bigger market for FM, but not that much bigger. It would probably hurt the Greek guys though cause they are the only ones that offer big AM transmitters, so maybe it's good.
@@spectra-man I got the Chinese kit and the harmonics are desperate though I was able to clean if up a good bit with a LPF. Keep up the good work here, you have nowhere near enough subscribers.
Great 👍.
Does it retain its settings after power loss? Does it come up directly after power fail without intervention?
Good... Vedio ... From India
Good man.... from US :)
Olá Spectraman estamos com saudades do amigo, aguardamos por novos vídeos.
What's best frequency to broadcast on for distanc
I was missing your video's. Can you try out the PCS Electronics CyberMaxFM+ SE+ V3 15W STEREO DSP + RDS transmitter. I'm very curious how they perform. We talked a lot about PCS.
I'd like to, yes, but I don't want to keep buying so many transmitters unless I'm sure they will sell. Maybe he'd give me a discount to do a review. I'll see.
@@spectra-man If he can give you a reduction i will buy from you
Thanks for the video. I've used quite a few of the RFNioRf low powered transmitters. They all use the BH chips and have horrible composite crud and pilot tone harmonics everywhere. Do you know if there are any boxed (
Only ELE.
Somebody said also RETEKESS TR150 has it, but I'm skeptical of it.
There are new type of Made in China low power transmitters. The model is called TZT EL 15S. There are 3 versions: 1,5W, 7W and 15 W. According to my information they are based on Quintech chips. So spectral clarity is better and harmonics are 10 dB lower than Rohm modulator chips. So they might be good excitters.
@@jazzforever4631 QN8007
Hi specroman I like your videos a lot! do you have experience with a radio master? Greatings from Holland! 📻
No, but I can tell his FM transmitters are the best on the planet. He showed the spectrum a while back. They are better than most professional ones and better than PCS.
@@spectra-man radio master for most customers is too expensive and I get rumors .. customers wait over one year (does not justify time / money / performance) ... PCS rumors is most problem with exciters .. PD850xx fall too often in 24h broadcasting... i believe thy overloaded... but for best buy still is PCS....
Olá Spectroman, estou pensando em comprar o TR510, você já fez análises ou testes nesse TX. Grato
Utiliza o chip QN8007 em sua construção.
This transmitter is being shipped to me right now. So I will make a video in a few weeks :)
Este transmissor está sendo enviado para mim agora. Então, farei um vídeo em algumas semanas.
@@spectra-man Agradeço por seu tempo e sua atenção. Vou aguardar pelos novos vídeos.
just in general i want to know is there any restrictions on transmitting?
it's only illegal if you get caught 😉 not legal advice
Is it suitable to use RG174 TNC cable with a CZE-7C transmitter?
Yes, that should work, but I'm 90% sure the 7C uses a BNC connector not TNC. Maybe it's a different model you're looking at. Just make sure it really is that and not BNC.
@@spectra-man The manual said TNC. I looked on Google and it said RG174 can handle 17w at 1Ghz and I'm assuming 100mhz is less heat? Have you run any 12v transmitters at 13.8v?
@@BobSmith-nh6oi Better look at the back and confirm it's not BNC. You can just google an image of BNC to see. If it handles 17w at 1G, then it's perfectly fine.
Yes, I run them at 13.8V often. Those RD mosfets should handle it just fine. But if you have the option to use less then do it cause it might last just a little longer. You won't notice a difference in range from 12 vs 13.8V.
@@spectra-man It's a screw on so it's TNC it's not the twist lock type.
@@BobSmith-nh6oi OK, you're right. I just never see TNC connector on a CZE-7C
Cuánto es el precio de ese transmisor quisiera zaber
Does this transmitter cause interference with another radio station?
Yes of course
Whats the best one I can use for best audio
Quality thanks
ELE model EL-15S
Or retekess TR510
@@spectra-man Olá amigo eu comprei um TX EL-15S e já esta a caminho, assim que o receber eu volto deixar comentários. Um abraço
@@danielvieira-br recebeu? Encomendei um também e queria ver uma comparação com o 7C (que ja tive) mas n acho por aí
@@allanmenezes2440 Olá tudo jóia, sim eu recebi aqui o ELE EL 15S, eu ainda não abri ele para conferir por dentro, o 7C eu já abri para trocar o cooler por um melhor e com menos ruído. A princípio eu percebi nesse modelo EL 15S uma qualidade de som mais limpo, deve ser um IC CHIP QN seja o 8007 ou seja o 8066 que acho mais provável ser. O modelo que veio para mim não tem 15 watts, ele vai de 1 watts 1,2 w até 6 a 8 watts, notei que de acordo com a frequência escolhida sua potência pode ser um pouco mais favorecida ou não. Isso ainda pode sofrer influência do cabo e antena externa que escolher, assim como ajustes para um bom ROE. Eu penso que fizemos uma boa compra, áudio limpo, estéreo com uma boa separação, e possui um MP3 integrado, veio um controle remoto que permite utilizar a entrada usb, com alterações de equalização. Ainda preciso fazer vários testes, mas a princípio eu gostei e acredito que você vá gostar também. A conexão com PC eu não encontrei software, mais por usb o PLL funciona, com potência reduzida, mais serve se quiser apenas um som ambiente dentro de sua casa. Vamos nos falando, espero que goste, abraço e bom fim de semana.
What % is the stereo pilot set?
Sorry, I don't know how to measure. Do I just compare the 19khz level on spectrum with the carrier level and give percentage? But anyway, the BH1415F has a pilot level adjustment on pin 19. So if it was important, you could maybe change the component.
@@spectra-man honestly, I don't know. I've modded my 15 wat bh1415f chip to have no pre emsphisis and no stereo
@@antonio1681 Well, I think it shouldn't have pilot at all if you are feeding mpx directly into the chip.
@@spectra-man there's a filter in the Transmitter that blocks frequencies past 15khz so I removed the pilot, pre emsphisis, and had to use rc correction in stereotool to get past 15,000 hz. The bass is very weak on this transmitter.
@@spectra-man According to the ITU regulations, 19 kHz pilot tone must be 8-10% of 75 kHz modulation. I have quite good experience with BH-14xx (Rohm) IC modulators in Chinese transmitters. But under some conditions: They are good for power rated 15-30 Watts. Especially (as you confirmed in one video) if is transmitter set 50-100% power. There can be some harmonics (300 and 600 kHz " + " and "- "adjacting your set frequency), but nothing serious. And I can confirm your claiming, one model 25W on lowest power setting have interferrence most likely RF leakage of OLED screen. Regarding "sound", my experrience is quite good. Even highest quality professional transmitters are having 50 Hz high pass filter. Rohm chips are having 15000 Hz low pass filter (guarding pilot tone), and deviation limiter what is really useful. Regardning stereo signal (Multiplex) sound, is not much worst compared to the professional transmitters I worked with. If your intention is to transmit studio produced program directly to the audio input, it must be sound processing. And if your intention is to use built in SD and USB player, sound must be processed (EQ and multiband compression) before you transfer the recording to the medium. FM Stereo broadcasting even in the latest digitaly processed MPX encoders, can never be "Hi-Fi". Limitations are in the principle, and stereo signal must be 4-5 times stronger than mono in order to have equal signal to noise ratio.Many FM Stereo DX-ers, enjoy this specific not audio purist sound,...
so can i add any addition fm amp to this 7w transmitter ?
Sure. It's decent for that cause of the variable power output. Try a 150W amp from ebay. The blue board with the round MRF177 or BLF177 might be good or a better one from pcs electronics.
@@spectra-man can any transmitter work for that amp ?
@@spectra-man can i add separate or extra amp to 15w or 25w transmitter ?
@@yungman3033 No, of course not. Do you understand you have to make sure the input wattage is correct? The amps page will almost always tell you how many watts or mW is needed to drive the amp. It sounds like you have no experience with electronics, so be very smart and make sure you don't damage the amp.
@@yungman3033 Separate amp for 15 or 25W: That would be a bit more challenging because today, no amps require that much input power. So you'd have to turn down the TX or add an attenuator, but with your knowledge, that is not possible for you.
So if you want to drive amp, buy a transmitter like this one in the video.
How long range pls?
Depends on location. Flat or hills/mountains?
If flat and not city, maybe 9 km.
City = 3 km.
This is not always correct cause it depends on the height of antenna.
Thanks for the reply! I was waiting for 3 months for the mini radio master! I 570 euro no power supply! no print for the modulatie! And before I send him the money I asked him is de transmitter plug and play! he see of course he is ready! No I must buy de audio normalizer 250 euro and the power supply is 55 euro, I feel a little bit repped of. And he no that! He played a game in the whit me!
😔😔😔
Yeah, his price is a little too high for what he offers. It's very barebones. At the same time, he does the work that normally a team of engineers would do at a business.
@@spectra-man yes, I think you are richt, the little transmitter is a piece of art! I buy from him the digital audio normalizer! The price exstra is 250 euro! 😑👍
I was making a mistake! the mini radio master was not l570 but 570euro! The letter l was before the 570. Sorry! I had not my glasses on! 🤓🙄
I have a challenge for you young man since you know what's wrong with them after you've made tests on them put in some circuits where they will improve and do what they're supposed to do let's see how much of a genius that you are.
one more rubbish ... Thanks for the video
The driver and final are over biased
I HAVE 4 CHINESE GARBAGE FM TRANSMITTERS. WORK GREAT FOR A FEW WEEKS THEN TURN TO CRAP
Please don't give up your day job🤣🤣🤣
Too much babble about nothing, I gave up after 3 minutes of droning on.