WildCat FM /technical station.

For a clean electric wave and a good sound (special volume addendum 1)
Width and quality of maximum value electric wave of sound in frequency modulation broadcasting


 

About BROADCASTER, the thing sent at a standard level of a correct sound is a natural thing.
Are not you in can call BROADCASTER of truth by knowing and managing the quality of the electric wave that I have output?

Does your bureau know width and the quality of the electric wave to the sound that I have emitted though the thing with an important thing sent at a standard level of a correct sound before it says of commenting on tone quality is described in detail on the page of the voice level calibration sound source.
 

Width of electric wave that mini FM station has output

The maximum values of the sound (100% modulation) in the frequency modulation broadcasting of Japan are several 150KHz The electric wave of FM makes the sending frequency change up and down according to "FM=Frequency Modulation" voice signal as its name suggests and transmits the voice. "It is best and paddle sound" will have gone out at this time by the translation that the range to make the frequency of the sent electric wave change says 150KHz (100% modulation) in the maximum.

Because the reception side (FM tuner etc.) is made from this standard in addition, because the width of the electric wave exceeds the range of the standard even if it is thought that "Paddle sound" is output, the sound is distorted. It is necessary to maintain the range called several 150KHz in this maximum value with to broadcast because of a good sound.

Frequency Deviation 150KHz before reaching the volume that the commercial broadcast bureau has output because the quality of the electric wave is bad for the stereo transmitter for mini FM and the width of the electric wave is wide. It is necessary to note it because the sound not only is distorted but also the band extends and the trouble is caused to the adjacent channel if it turns up the volume forcibly. bandwidth when it tried to output the same volume from the speaker with the transmitter for typical mini FM was compared with the transmitter of a straight broadcasting standard, and see even gooseflesh, please while setting

The signal of 1000Hz is put in L+R of a straight transmitter, and several Frequency Deviation makes, receives the signal of this time by the WIDE band of FM tuner, and assumes 150KHz =(100% modulation) with the standard at the audio level.

OBW (width of the electric wave) is measured in the occupation band measurement mode of the Spectrum analyzer (electric wave analysis device).
It measures under the same condition, and all 1MHz and glancing piling are made easy to understand in width (SPAN) of the screen with 100KHz.

 
FM LABO TX-03F. Ver2000ME
(broadcasting standard)
corona industry Telstar TR-10RDX yatugatake ham club TXS80PLL

L+R 1000Hz

L+R 1000Hz

L+R 1000Hz

I think that the thing that the skirt of the electric wave has extended at random when comparing it with a straight transmitter is understood. In seeing this screen and cool, what am only I ?

As for the occupation band of TR-10RDX, to become 194KHz, and to put out the same volume as 122.6% and 129.3%, TXS80PLL becomes a great overmodulation by 184KHz in the measurement.

Before it says of commenting on the measurement result of the occupation band if you see the image Though it is thought that it is understood that the width of the electric wave diffuses in Yabai even if the ape sees.

The following image is the one when the signal of 1000Hz is put only in L-ch. The occupation bandwidth changes because the condition becomes severe at time when the signal was put in both channel
 
FM LABO TX-03F. Ver2000ME
(broadcasting standard)
corona industry Telstar TR-10RDX yatugatake ham club TXS80PLL

Lch 1000Hz

Lch 1000Hz

Lch 1000Hz
 

The thing that the width of the electric wave has extended obviously is understood though TXS80PLL is displayed with TR-10RDX and 182KHz in the occupation band measurement mode of Spectrum analyzer as 185KHz.

The condition deteriorates further when a complex music signal is input though the above-mentioned measurement screen is due to a single signal of 1000Hz.

It applies from a basic circuit composition to the transmitter that the "99%" your bureau where the Yabai signal to which the electric wave similarly diffuses almost is observed from the transmitter that has started in life for mini FM is using. Recently, the model that uses LSI said that the sound is good is to our regret the same.

The screen is seen in width that 1MHz is wide, and the noise region is terrible complete observation in TR-10RDX and TXS80PLL. The range of 1MHz is displayed, and please review again and look at the thing on the screen of this measuring instrument. It might be what how though thinks that it is a quality of the electric wave really permitted because it is a slight electric wave of about 1-10mW. ???

'toriatama' though thought that the thing can be physically understood even from impossibility in a toy transmitter even if it tries to output the volume that the commercial broadcast bureau has output if the above- mentioned screen is seen.

The sound not only is distorted but also the band extends, it becomes only a mere jamming wave generator that causes the trouble to the adjacent channel, and this is a transmitter that you are using if it turns up the volume forcibly. It seems that it is a natural thing even if there are a point and a criticism with low technological level from a poor quality of the electric wave of mini-FM on a part of Web site.

Knowing this current state is used and the thing is and there is already no method because your technological level is low no matter what it is said...However, Germanic peoples are the expression, and are 'Nyaaatsu.

in breaking out of a doubtful technology and the experience, it is not in happening of to intra band and the side because of the electric wave that you who thinks that it was able to understand a little have output strong, and because the band diffuses extremely badly, the quality of the electric wave is Cab on the side. Think about the quality of the electric wave if you think that you want to output a little strong electric wave.
 
 

 

Genuine transmitter and only several thousand yen of broadcasting standard. Toys of tens of thousands of yen are compared and how many. Knowing this difference thinks and one step and we of the start to the technological level improvement think about though it seems to be said. It is possible only as a technological level is low even if passing until what time if the difference is not understood. It is in mini FM only of the far repetition of straying before putting out the electric wave by a low dimension.
This stray technology without relation a lot superstition belief invent nuisance to the neighbors electric wave trouble bring cause this respect clarify meaning especially measurement comparison open to the public.

 
It wishes the thing that mini FM that aims at Broadcast increases even by one game by a clean electric wave by this report.
 
 
 
 
'Asking from WildCat'

I do not think that it is of the idea of straight engineers such as calling power UP kit etc. and adjusting the output to 500mW. When the quality of the signal that corresponds to the output in putting out the electric wave is not considered, it doesn't become it. Though it might be good if it is said amateur's technology after all.

In such a state, mini FM is spread and what general people recognize is difficult at all. There is no method even if even pass until what time or called a source of "Mini FM = garbage electric wave" electric wave trouble. The voice of the point and the criticism with low technological level is listened to from a poor quality of the electric wave of mini-FM, and it is the worst in a part of Web site because it is said by the amateur who doesn't have technical knowledge and it needs. !!!!

Easy electric wave output broadcast enjoy thing mini FM at least technical learning necessary technical guidance standpoint provide person tenacious guidance support would like wish.

In each manufacturer, as for the thing, it is thought the thing needed by thinking that it wants to spread mini FM as such, and it agrees to a thing the sales price enough, and regards the user by developing selling the transmitter etc. for mini FM. as would like you to clarify the quality of the signal of the equipment in clarifying danger to the act of amplification etc. that cause the clarifying electric wave trouble and evaluating the grade for the quality of the electric wave by me

It is out of the question in case of any thing, and disclose evaluation information to the thing that the quality of the electric wave of the sold transmitter cannot be judged with the verification of the product to sell danger and the recognition to the electric wave newly, please. !!

I think that giving correct product information and knowledge to the user though all are user's self-responsibilities is sales person's responsibility and breaks out.

Because danger is not possible ..causing the electric wave trouble in FM band if it is a clean electric wave and it exists.

 
 
 
 

I wait with mail for a technical question and the complaint, etc. To the WildCat FM /technical station /Mail
 
 
 
 
 
 


 
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2004/04/22 last modified on 2005/09/20