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.

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.

Good man.... from US :)

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....

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

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

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.

it's only illegal if you get caught 😉 not legal advice

Yes of course

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

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.

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.

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.

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! 🤓🙄

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,...