Hi everyone!!

Hi Louis and welcome to the forum.. I am not a moderator of this site, just a member.. But I doubt that an intentional action was taken to keep whatever post you made from showing up...

It could have simply been some kind of glitch, or maybe you accidently just hit "preview" instead of "post" - this would have meant your post never got applied.

The clearest answer I offer is that your missing post was not due to poor management of the forum, and that new members are always welcome.

and welcome to the forum.

When someone registers for the forum their posts are subject to an automatic scan for spam. This is because if we didn't have the software do this the site would be flooded with unwanted spam. The site gets several attempts per hour from rude and aggressive spam posters and unfortunately the software blocks good posters such as yourself at times. It could be due to a key word or phrase which the filter misinterprets as spam content but which is not.

When a post is flagged as possible spam it is not published but goes into a list for moderator review. If the post is acceptable then it is published by a moderator. The moderators are not notified of this but must check the queue periodically. Unfortunately, as in your situation, this can take a day or two.

After it is determined that the poster is legitimate and not a spammer their status is set to bypass the spam catcher software and future posts are allowed. This has been done for your account so you should not have a delay again. If you do or have other problems with the site please let us know by using the CONTACT feature under Navigation to contact an administrator.

We are sorry for your problem but it is the result of protecting the forum from those who try to abuse it by spamming.

Neil

Glad to get the answer about it from you. Maybe my post looks like the spam. But maybe the system can send an internal message to point the member's answer not pass and tell them why it didn't pass. So we can communicate more kindly in this forum. I like this forum, sincerely.

Louis

Nice to receive your tips. But I confirm I hit the "post" not the "preview". Neil is a good forum moderators and he patiently to give me a specific answer. Let's friendly communicated with each other in the forum. I'm very interested in FM transmitter and radio station. Please kindly advice me if I go in wrong way on FM.

Hello Louislau

I am here early this morning in the middle of the USA and curious about where you are living, and what the regulations are for radio in your country.

Here in the U.S. the rules for unlicensed FM are very very strict, we can only send for about 50-meters (200-feet).

In New Zealand they are allowed 1-Watt with no license, which covers a larger area.

Our AM medium-wave rules are better, as we can sometimes reach maybe 2-miles (how many kilometers is that?)

Hello, Carl. Thanks for your sharing. My homeland is China. It isn't strict as the same as the U.S. Nice to hear that play 1-Watt machine in New Zealand is legal. 2-miles is about 3.22 kilometers. Maybe one day will travel there with my little radio station. I have bought a low power FM transmitter on website: . The follow clink is the model CZE-05B that I bought: Is it meeting the FCC 15 part? Please kindly give me some idea about it.
Thanks a lot.
Louis

Part 15 FM in the U.S. is governed strictly by the field strength of the transmitter and not input or output power levels.  Since field strength is difficult to measure unless you have expensive equipment, the FCC uses a 'rule of thumb', which is a range of 200 feet to an ordinary consumer type radio (that means you will get 600-800 feet to a very sensitive car radio).

I doubt very much that the radio you linked to would be Part 15 compatible.  It is possible with some radios to reduce the power output, and also attenuate the output even further by creating a mismatch between the transmitter and antenna, although you would have to be careful that you don't blow the output transistors.  But basically, if you're getting more than 200 feet of range to an ordinary home radio, then you're not legal.

However, there are transmitters that ARE certified for use in the U.S. (and Canada, which is where I'm located).  The Decade MS-100, the C Crane and even the Whole House 2 transmitters can legally be used in the U.S. and Canada.  Canada has slightly more relaxed rules than the U.S. - we're allowed 4 times the field strength - and Decade MS-100's that are sold here are tuned specifically for that field strength (if sold in the U.S., they're tuned for the lower field strength rules there).

One thing that worries me about the description for your FM CZE-o5B transmitter..

The website says "FCC Part 15 Approved."

But read it again. It does NOT say, "FCC Part 15 Certified."

The word "approved" has no legal definition in the case of FM Part 15 Regulations, which is FCC 15.239 gives the field strength limit for frequencies between 88 and 108 MHz, and I can guarantee that 50mW (50-milli-watts), which is the power of your transmitter, could easily be far too much.

The way to control it is to use a very weak antenna, or somehow reduce the power.

But, there is another serious thing to learn about... transmitters produce harmonics, which are frequencies above the FM band, which must be very much supressed to avoid interfering with... get ready for this.. airplane traffic!

For example, what is two-times 88Mhz? The answer is 176Mhz, which is your transmitter harmonic frequency. If you send a signal at 176Mhz and it is too strong... you will be interfering with airplane traffic control. This will bring instant knocks on the door.

That is why you need an FCC CERTIFIED transmitter for legal FM broadcasting... it keeps you safe.

Ask any questions and a bunch of us will have answers.

This transmitter works at 500mw or 100mw. This would be putting out a field strength way over the part 15 legal limit. Even here in Canada would be over Industry Canada rules. Also may be getting interference in other bands. You need a 50 ohm attenuator to lessen the power. Using a bad antenna will possibly blow the output transister.
I assume you are in the USA but if you are in China you don't have to be concerned with the FCC.
Artisan had the best suggestions:
The ccrane 2 is FCC tested and approved
The Wholehouse 3 also certified for unlicenced use is excellent! am using this.
The Decade CM-10 is good and comes certified and adjusted for legal USA power.
The Wholehouse in my opinion is an excellent choice because it has a on board mixer for mic and voice, adjustable pre-emphisis and can work also on batteries.
There's also Ramsey, which are kits but are fully power adjustable. Not FCC tested and certified though.

Mark

I have played with one of these at 100 mw using the supplied Rubber Ducky antenna in the house.  In my location a car radio (SuperTuner) could hear it about 900 feet away but it was spotty at best and that was on 87.9.  Now at the other end 107.9 there is a fringe station across the state.  At 100mw using the same arrangement the distant station would step on it at 900 feet. So, IMHO unless you are interfering with a licensed broadcaster, selling advertising etc. you would not draw much if any attention. Also, 176 MHZ is VHF TV Channel 7 not aircraft.

Yes! I forgot that the 2nd part of the VHF-TV band is up above the FM band, and I guess the FCC probably monitors that... especially if there are licensed services of some kind using those channels.... but somewhere up there is the aviation band...

But let's change the subject.

Question for Liuislau... What type of programming to you hope to present?

Will it be music? Or talk?

Yeah, if you were truly getting 100mw output, your range would be much greater than that - the Decade MS-100, tuned to Canadian standards, can get up to 1 km line of sight to a sensitive car radio (although it's generally about half that if there are any obstructions).  I suspect that the stated power output of this transmitter is optimistic (to put it kindly).

Hi, Carl. I have no idea temporarily on the program of radio station. At present, I play it as the Music sharing community station. Because I love the stereo sound music so much. Now I am in China, I am the student of university. The FMUSER is the company where I do practice before my graduation. So I have a chance to touch the wireless technology and crazy for it.

Carl, did you have already estabilshed your own radio station? Kindly sharing lots of news about radio station with me.

Louis.

Hello, Mark. Glad to learn more about the LPFM transmitters that meet the FCC law. The Wholehouse 3 I have ever found it from Google. And its' website built so nice to visit. Now I'm in China and work for FMUSER INC. I have some friend in U.S.A who want me to recommend them some LPFM transmitter. After learning from the forum's friendly member, I know more about the restrictions of the FCC. Maybe I should recommend them the lower output FMT-980 to them.

Louis