It is a new project to enjoy the technology.
Transmitter KIT sold for mini FM is actually produced. It introduces it one by one on this page. I think that it serves as a reference from the beginner to the old-timer. Then, it goes to be going to buy KIT of the transmitter in the future.

Page next update to the enjoyment.

Does the oak and getting on mean and very does badness. mean whether to say if it carves it for the state as it is and as many as two years though the project in fiscal year 2002 should have started for the feeling ? No one cannot get on, and toy KIT spurn the feeling very much now certainly. A very rough-and-ready work of the omission does.. "Ideal FM transmitter" Bare then to changing into the theme and the record of the requested basic matter and merits in FM transmitter 'I will not explain the omission for you who hopes for the technology at the professional level. the content considerable Heavyweight though.

Please concretely narrow the content of the question on if there are an uncertain thing and a doubt for this page. A special technical staff of WildCat FM each will answer taking the responsibility.

transmission part (transmitter)= FM Exciters and stereo modulation Transmitter. machine FM stereo generater ....
so-called though it combines and it wants to expect calling FM transmitter = FM stereo Transmitter.

It might be correct that the fellow with a small output for Excite says FM stereo Exciters. !!

Large a chine leave the FM stereo Transmitter showing in a certain place for taking the shape and wanting expect saying? The small size is interesting the professional world because it becomes the machine of about 100W. ..(Wa

Introductory remarks and merits are excess. To the subject in ...

As for the signal in a right image, the signal purity is obviously deteriorated and it is understood that it is bad compared with S/N when comparing it with a left image (high precision crystal oscillation machine). As the signal of FM transmitter, this is Pure signal. The bad signal is ..this screen installing The measuring span ..might an integral dB it how many compared with S/N of the signal in the image in and the right is 1000Hz, and one grid is laughter 100Hz.
Do over there from see the measurement image and left by gooseflesh though it is thought that it derstands?

Moreover, the design of the loop filter of PLL badly by the control noise of PLL. It is modulated and the model that increases the phase noise with accelerating speed exists considerably in the inside, too. When the lock cooking stove of wide-ranging PLL is obtained, deterioration in the electric wave (purity) is not avoided by the control noise of PLL.

Moreover, the frequency floats when the time constant of the loop filter is lowered to avoid noising easily. To avoid this, the design of a complex loop filter by the advanced technique is needed.

I do not have meeting to our regret in an efficient transmitter that still completely clears this conflicting problem to which the advanced technique is turned on.
 

Cannot an ideal transmitter be able to suppressed a slight blur of the phase if it doesn't at least suppress it up to about 15 degrees because VCO of FM Exciter needs the frequency modulation signal with a wide cooking stove though the advanced technique is necessary?

To secure the frequency modulation signal with a wide cooking stove, VCO causes the problem of the floatage of the frequency, and sees a high equipment considerably. bad's? There is what sees 200Hz and moved gradually up and down.

This is a class of mere defective goods if it sees from the engineer who is taking one's life in one's own hands to the frequency accuracy. !! Around here?It cannot be said that the stability level of VCO is good if it is not a title by 30Hz or less.

As for a right image, a lot of signals can be confirmed to surroundings of a basic wave (Intraband is only garbage). The electric wave trouble cannot be evaded because there are no prevention ways in the bandpass filter and the low passing filter when existing near intraband and a basic wave because this garbage signal of 79MHz-633KHz=78.367MHz that there is a strong signal in about -633KHz for a basic wave is amplified as it is.

Moreover, by the mutual interference when this minute oscillation exists near a basic wave It causes to be generated an unpleasant beat sound the causing reception ..interference beat of the stereo and the pilot signal.. sound.

This garbage signal might happen because of signal Leak of the loop filter of PLL, and appears to integral multiples of the comparison frequency in this case in rows. If PLL is separated, it is possible Leak spurious by faulty design of PLL it is the one by VCO to identify it.

so-called Para oscillation are "It is a phenomenon (abnormal oscillation) that oscillates disorder it as for all the frequencies. "

If the oscillation signal of VCO doesn't oscillate Pure signal from the beginning I want to get it from an original signal of an ideal transmitter driving in the of can use thing to the head once now. What you may do, and the becoming it thing is breaks out absolutely and profitable in the starting point of the electric wave as having explained by us useless even if VCO and this do what kind of thing bad and after.

The thing that the result your should would being better to design a circuit that is newer to tinker halfway VCO is obtained is more abundant.

3.The modulation without the distortion and the straight line are good things.

The starting point of FM modulation is a changeable oscillation machine, and according to "Changeable frequency oscillation machine VCO =" and the audio signal as for the frequency. Naturally, if the oscillation frequency cannot be accurately changed to the audio signal, the signal is distorted.

The electric wave of FM makes the oscillation frequency change up and down according to "FM=Frequency Modulation = frequency modulation" voice signal as its name suggests and transmits the voice.

Problem of PLL given to VCO
The contradiction said that it cannot accurately change the oscillation frequency to the audio signal is caused, and it happens dynamically in the low frequency region of the audio signal of especially 100Hz or less because PLL perceives the gap of the frequency when the transition of the oscillation frequency happens because of the audio signal and the correction is put.

Because the oscillation frequency cannot be accurately changed, the signal is distorted. An inferior thing is 50Hz? though this has the problem in the design of the loop filter of PLL with the modulation circuit of VCO in many cases. The input of the audio signal of about 200Hz collapses by receiving the obstruction of the control signal of PLL and no stop of the shape of waves of the audio signal of the prototype.

Tone quality becomes and becomes a story before saying because it cannot correctly modulate the audio signal when VCO is very much imperfect with an excellent, efficient modulation machine.

Engineers of a certain famous modulation machine manufacturer have seeing the thing the plain description to the manual to lose his/her temper considerably because the performance of the in-house product cannot be made the best use of by Exciters for the professional because a lot of things with a bad low region characteristic exist when adhering to this matter. Then, Exciters is developed by itself and in the furnace though it thinks Other areas cannot be violated because it comes near to a union for the United States and it is protected. Do ahead of that with Exciters and stereo generator though it is not in an easy story because a technical genre is extremely different?

If an efficient modulation machine is used, VCO that the low region characteristic is good was installed, and if Exciters is not used, an efficient modulation machine becomes a mere ornamentation because there are no 100% life skein ..the performance.., too.

enough to the understanding of the view of the measuring instrument. Look at the last image, it is displayed as 50mS to display TIME.DEV to upper right, and is displayed time that the time axis of this person mass of which it thinks (ten masses in length and breadth) when the lattice (grid) is seen in length and breadth sideways does the sweep though this is not seen easily on the screen where the time axis is displayed. Therefore, the thing that includes the thing said the observation by 2+1/2 waves every 0.5 seconds that become 0.5 seconds in the signal of 5Hz comes by the confirmation at time for 50mS to do the sweep from the left of the screen to the right. The frequency of the signal that does other screens in this manner and is displayed can be confirmed.

the influence on the signal grows in a frequency that is lower as understood.

It is necessary to note it because the sound not only becomes unstable if the influence when the obstruction is received goes out with PLL in this manner the audio signal and the signal below the coming frequency is not cut with the filter etc. but also the stability level of the transmitted electric wave will be lost though tone quality becomes a story before saying because the audio signal is correct and it cannot reproduce it.
 

In the transmitter of the image on the left, if the frequency less than it is not cut with the filter because about 70Hz is a limit, can it be simply guessed that the adverse effect goes out to tone quality from the signal?.

Because the restriction of the upper bound frequency has been received by the Parot audio signal of FM stereo signal, it is large in a basic quality and influences it to emit a good sound whether the signal with a clean without the distortion low frequency band region being able to be reproduced. Recently Europe frequency modulation broadcasting equipment audio signal low frequency band region how reproduce say respect value circuit design equipment a lot see technology shop arrive all same anyway low frequency signal high frequency signal multiply region signa distort all sound become impure region signal distort powerful enemy thing become By the way, latest FM Exciters of Europe has sales of the signal of 10Hz coming by reproduction.

To transmit because of a good sound in FM stereo, the performance of VCO is greatly related.

Starting point 1 of the frequency modulation broadcasting wave is a signal that VCO oscillates. (calling commonly career signal, and main signal carrier)When whether it is called the career
signal is said why, it is a thing of the signal that simply carries the thing. The signal cannot fall into disorder or be impure and information be transmitted accurately.

Starting point 2 of the frequency modulation broadcasting wave is a subcareer signal (subcarrier) that transmits the stereo voice signal.
The electric wave of the frequency modulation broadcasting has extremely delicate stereo voice information called a subcarrier in voice information that put voice information on a main signal carrier and was put by a main signal carrier. If the subcarrier has fallen into disorder though there is a main signal carrier clean, information is missed and cannot be transmitted. (The monkey understands. )A good sound is reproduced only after all of the information are accurately transmitted by the listener. A small turtle has gotten on on a simple story and mother turtle and final information has gotten on on that. Which turtle transmits and information is not transmitted in correctly.

In this,, Understand.

A main signal carrier is a signal that oscillates in the frequency modulation broadcasting band . As the example, 80MHz TOKYO-FM etc.(signal of electric wave)
38KHz in the subcareer signal that transmits the stereo voice signal with the subcarrier. (It is suppressed at a no sound standing up with the audio signal by an intermediate signal of the electric wave and the sound without the audio signal. )

To synchronize the subcareer signal on the reception side, a standard signal and the pilot signal is 19KHz . (signal at a position extremely near the audio signal. )

20Hz? voice information (audio signal) when FM stereo broadcasting is generalIt is a range of the frequency in the ear of 15KHz where I hear (It is a signal of the hearing sound in man's ear).
 
 
 
 
 

When the site is updated next time, the chapter of FM modulation machine is scheduled.
 
 
 
 

Supplementation
In the above-mentioned explanationThe point of the matter to which the harmonic component of the electric wave and the explanation for spurious were not performed was received. It wants to explain the harmonic component and spurious somewhat when the site will be updated next time and to see though it pursues the subject by the viewpoint said that it is natural that the harmonic component and spurious are removing it made.