WildCat FM /technical station.

What do you want to do with a toy of this "398" FM transmitter ? /TR-10RDX

It stocked with TR-10RDX

It has stocked with the toy and TR-10RDX of famous the sound is good in the homepage of certain and mini-FM.

The truth is confirmed. whether to hear the sound the same as the reputation immediately in

Because a steady with straight line detector the way things are going electric wave is not captured because the output is extremely low when the electric wave is output, it immediately resolves it.

Taking the toy apart must not retrieve one's childish innocence after an interval of ten years.

  
The connector of the place of the antenna is removed, and the line etc. are connected for the measurement.
 
 

The electric wave is observed with a straight line detector and the MPX signal that is basic of the sound is observed with the capturing oscilloscope.
When the pilot signal is first seen, it is "bad signal" in This is not chancy.

Frequency Deviation of the signal is 12.2% in 9.2KHz. "6KHz-7.5KHz is an original standard value. "

The width of the electric wave extends considerably when it is this signal.
 

The sine wave signal of 1000Hz is input to become 100% modulation to L-CH.
When the composite signal is seen, it is such feeling. This might be "Yabai" Then, will a straight sound be emitted ?

The "monkey" and the "cat" understand the thing that not is straight.
 

It is expanding, and the "nanjakorya" in what that understands plainly.
 
The emitted sound is already imaginable,
 

Though the MPX signal of the sound system was measured for the time being What sound you emit if this signal goes out over the air can be imagined even without listening.

It wants to see the relation between PLL and the sound and to see. The toy of "398" only is toyed still and exists.

To the object that means how might ? tone quality so and so in not becoming it though it is thought a sound and already former problem in this MPX signal.
 
 
 

 
 

By the way, look at a straight MPX signal, and the FM stereo MPX signal with a correct this image in the reference because straight MPX signal is not thought that not wisdoms but what "Yabai" is understood.
   
Recall this signal image when FM transmitter that you are efficient comes to want it and it buys it newly, and Nya in the standard of the performance evaluation when the future the wish for the becoming it thing !! Nyaa..
 

Chapter of high frequency

The spectrum analyzer (electric wave analysis device) is used to see the electric wave directly.

It makes the room dark to prevent the screen being reflected with the digital camera installed in three in front of the measuring instrument and it attacks it. Then, I go and see?

The frequency shifted by 88.004180MHz by about as many as 4000Hz when the transmission frequency was measured. "Such" of toy why

it shift when it is a genuine transmitter and +/- about 20Hz ?
information. Was the transmission output 2.8dBm, 1.9055mW, and is a safe output around here though thought understanding later ?

Excellent crystal of the stability of seeming use level is extremely excellent though the frequency shifts, and the regulation : by about 10Hz.
 

It sees with SPAN400KHz in the same condition as a certain homepage. The pilot signal extends and the occupation band of the electric wave extends to a no sound with wide width because there is "Rariteru".
photograph/C
 

Is it such feeling when seeing with SPAN800KHz, and how? Because SPAN is 800KHz, 87.6MHz right edge is 88.4MHz in the left most edge of the screen.

The electric wave of no modulation is "Dobar" and is extension so without putting the sound. "It might be Yabai. "
 
 

 

Can it be something of difference..?? When the measurement comparison is done on a photograph/C and the same condition, the difference of the diffusion of the electric wave is understood. However, how do not you understand what "Yabai",.... Nyaaaa!!

Please refer to the following for the measurement report
from side of width electric wave of that mini FM station
sound insertion passing FM stereo modulation signal Spectrum seen
 

Though measurement SPAN is set to 50MHz and -25 from +25MHz of a basic wave was seen Neighborhood Sprias (garbage electric wave) is considerably observed.

 

Measurement SPAN was seen and even -50 from +50MHz was seen with 100MHz The garbage electric wave of neighborhood might be near roughly -25MHz from +25MHz

 
 

The following will see the harmonic component. When the setting of the analyzer is changed, Start is done from 50MHz, and 500MHz between 550MHz is seen. The harmonic component of the frequency from 2 to 6 times a basic wave is observed and the fellow with considerably high level.

I considerably think that it is a state of bad because it can receive the electric wave also with 176MHz or 264MHz and 352MHz if it transmits for instance with 88MHz when the harmonic component with high in the so much level goes out.
 

And the harmonic component are it is to where and 50MHz?. When the setting is changed into 1250 MHz, and it sees between 1200MHz. It gets well again from the ninth high note wave though the seventh wave and the eighth wave are extremely attenuate.

The observed harmonic components with the highest frequency are the 14 th harmonic components and about 1230MHz. The harmonic component and spurious are extremely dangerous and Bad electric waves that obstruct TV etc. directly.

This transmitter is remodeled, the electric wave is amplified, and the output is raised. By the cellular phone's becoming an out of the sphere in the vicinity It seems to be able to do another usage.

Because the quality of the electric wave is bad Never do remodeling it because it is an extremely dangerous act that amplifies the output of the electric wave.
 
 
 
 
 

 
 
 

1. Power up TR-10RDX.
2. The distance of a jump of the electric wave of 10RDX. A super-simple antenna.
3. Let's draw out the output from 10RDX outside with the coaxial cable.
 
4. Let's emit a straight sound from TR-10RDX.
5. Does the version improve before one is aware, and did the sound change?