Evaluation TECSUN S-2000 ,radio Reviews


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Evaluation of a radio, not just from the receiver to evaluate the sensitivity, good or bad addition to the sensitivity of the radio, as well as selectivity, signal to noise ratio, audio quality, maneuverability, stability, novelty, and many other aspects.

Two or three years, many manufacturers of non-DSP are significantly advanced radio frequency to the second / first IF frequency of the mode used to move closer to high school, Degen 1103, Robinson’s RP2100, German students PL600, PL450 and present S-2000 are like this, I saw this line is the first model in Japan Sony ICF-7600GR (of course, limited to my level, this model is the first in line 7600GR radio I do not know, here to say I only just read the route map.) Of course, the manufacturers have improved, not the same line. Making full use of this model band radio, AM can be a better solution on the full range of broadband coverage problems, if the first intermediate frequency selection 55.845MHz (high frequency), the local oscillator as long as you can from 55.945MHz to 85.845MHz coverage 100KHz-30MHz band, and from 55.945MHz to 85.845MHz, coverage factor: K = f (max) / f (min) = 85.845MHz / 55.945MHz = 1.53! Coverage factor than lower half of the medium wave radio

PK would like to present some friends a few radios belong to the principle of the list, tell the truth, these types of radio sensitivity are very good, so that PK does not make sense.

In order to prove that PK does not make sense, I quietly tonight specifically S-2000 and PK DE1103 really a lot, in fact, that I think is right. S-2000 can not receive radio, DE1103 is not received, S-2000 be received, DE1103 can receive! However, in the course of PK discovered some minor problems, find S-2000 suppressed the background noise very well, receiving weak units 5945KHz and 4950KHz basically can not hear that when the “hissing” noise floor, the sound quality is very stable clear and very enjoyable feeling.

[Figure: 3915KHz two machines I have here received no signal]

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[Figure: 4950KHz I belong to a weak station reception here]

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[Figure: 5945KHz I belong to a weak station reception here]

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2, China’s relatively few manufacturers of professional radio production, especially in Germany born ten years have been doing radio, and other manufacturers in recent years also went a lot of good radio, the radio is not in today’s major media the age of radio is not easy to do, and their products are constantly improved and perfected! So, for those of us radio enthusiasts, they are the first, so I no idea A> B> C problem!

Second, I view the radio production process

These are my radio PK of the two points. The past few years, playing the radio, I also experienced from the start, and slowly and slowly in-depth familiar with the process, in the process, my concept has undergone many changes, I also really like the beginning than the radio, I remember At first hard to buy the radio, new, old, on the jar, street electrical repair shop, in short, the pupil will swell to see the radio, they buy back some great PK, but I was probably more stupid, the total could not tell which is good, which is not good, that almost all are good, like, so buy a back issue a say on the radio this good post!

Until one day, Guangzhou 7LE came to me, I just invited him along to buy a certain brand radio! Connected to power, Radio Wa Wade sing, Taiwan received a lot and felt very proud, 7LE looked at me and have a good time, silent, until I asked him, this radio is right! ? He said simply: “You heard a lot of noise out of it?”, I remember I was a bit shocked, to be seriously react after taste from the hands of a certain brand of radio, it felt kind of high radio frequency “hissing” sound ….

Since then, I went to eleven tasting that I bought a bunch of radio, and slowly came to understand, evaluate how much the radio single from the collection to determine the radio station good or bad is inadequate, not only to receive a good radio multi-radio, good sound quality, and noise should be small!

Both the radio station received more than, good sound quality, but also noise, interference to radio design and manufacturing is very easy, I’m afraid from the radio’s birth, until now, the future will be the radio design and manufacturers are the subject of efforts, this line from generation to generation of radio delivery can be seen more, from our collection today and play the radio in the process can also be reflected.

Why the old Grundig, Sony radio you say good! Desheng radio we say good! I have thought about this question a lot, most of which have experience in a repair is a lot of radio, I wrote a post was “a little view of the radio production process.”
In general, a six-transistor 1-conversion radio, including audio amplification in a high total gain of about 110dB, and the general design of audio amplification 55dB-60dB or so, so that high frequency gain of 50dB-55dB, if we can get a good figure, Radio performance has been very excellent, and if you want high-frequency gain of more than 55dB, then you must use 2 or other high frequency signal processing techniques, and if the increased high frequency gain in the same time, ask ensure good signal to noise ratio, selectivity, passband and other issues, then this edge technical difficulty can imagine, so make the required level of technology required is very high!
As the saying goes: “great accuracy”, for high frequency circuit fabrication, the slightest but the points, the solid component level, through high-frequency, intermediate frequency near the line connecting wire, the pin length installation components are all high, medium line production techniques, as components, lead can cause high-frequency shaking changes in the distribution parameters, severe camera shake is the failure, and followed by people is not easy to find, however, the distribution of these parameters caused by changes in will cause the signal to be modulated, phase changes, and severe faults that cause self-excited whistle, and a little light but was ignored, so the overall feeling of high frequency gain can not go up, the total magnitude of the demodulated output is also flat …
In the repair process, found that many people use smart radio design method of score-board cloth pieces, divided between the board makes the board and the board need to wire connection, glance, this is a desirable practice, but on reflection, this law in fact very high!
Sub-board cloth pieces can make the area of ​​each circuit board is relatively narrow, solid performance increase, even some of the radio frequency components and then separated from the circuit board, fixed on a metal bracket, so that its strong performance, especially high frequency of the solid line is greatly enhanced! The easiest to understand is that there are many excellent radio performance, the variable capacitor circuit board separate from the special bracket fixed to the …
Sub-distribution board is also isolated components or pieces of the mutual interference between lines is very effective measures, the actual measurement points on the board can understand the benefits of cloth piece of radio, the radio sub-board cloth pieces tend to have larger magnitude of its demodulator output!

[Figure: 745 red variable capacitor installation]

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Since then, I slowly more concerned about the radio structure and the production process. Many times, the same line, different manufacturers, produced the radio performance is often not the same, one of the mysteries which I’m afraid this is it.

Three, S-2000 of the production process and receive performance

Now, every time I get a new radio, always open the view, I see the purpose of which is to see much of the radio production process! Therefore, all the radio in my hand I have been split off, S-2000 is no exception! Demolition of one of the radio became my hobby.

Let us look at S-2000 of the production process it, making a map almost took me one day, of course, a lot of time which is slowly sipping S-2000 of the structure and process.

[Figure: S-2000 compact, modular structure technology. 】

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[Figure: S-2000 audio processing unit, potentiometer good! 】

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[Figure: Remove the speaker and the audio unit, the radio ‘core’ part is installed in a plastic bracket on the whole module. 】

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[Figure: Remove the ‘core’ after seeing the positive – control unit, S-2000 although the keys a lot, but very nice circuit board layout, board the original distribution, and reasonable! 】

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[Figure: Remove the control board, the back of the large screen, very good! 】

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[Figure: S-2000 motherboard! The modular structure of technology, too beautiful]

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[Figure: S-2000 to listen to local 100.3MHz Meizhou music, the song is playing, very nice]

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[Figure: Sanyo 7260 is a good quality radio, S-2000 and its comparison and found that S-2000 full-bodied bass to many, it sounds more flavor! 】

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S-2000 HF natural Needless to say, the reception quality is first class, look at the case of medium wave, medium wave antenna rotation really easy.

[Figure: Listen to 603KHz case, the sound is clear, almost can not hear other noises. 】

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[Figure: Listen to 621KHz case, weak units, small voice, a hissing sound. 】

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[Figure: Listen 1170KHz case, the signal is strong, clear sound, no noise. ]

Listen 1368KHz case, the signal is strong, clear sound, no noise

Weak performance in the receiving station, the electromagnetic environment due to my very good here, listen to AM radio a lot, looking a little weak units is not easy to do, are generally required to compare the frequency of side to find some point, find the weak units from the current listen to the situation S-2000 performance is very good! And more about the topic I want to receive the performance that more friends will talk to, and use my current situation, I think S-2000 to listen to really good effect, manifested in not only high sensitivity, and very low noise, the sound quality sounds.

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2, S-2000, another problem

(A), S-2000 AC power cord with fixed, although there are hidden behind the line of the box, but it feels good to use, it would be more convenient to install AC outlets;
(B), volume, tone, and three sets of potentiometer knob a bit with the handle, knob-hole too, need to handle on the potentiometer tape wrapped around it;
(C), medium wave antenna rotation nice, but a long time joint surface oxidation, then rotated to bring the noise concerns “;
(D), the speaker if the speaker can use the double-basin may have a better sound performance;
(E), power supply circuit design seems a bit complicated.
(F), amplitude modulation can only be accurate to 1KHz step a little disappointed, if they can do on the ideal of 100Hz;
(G), if we increase the synchronous detection machines may be more perfect;

3, Finally, attach a few pictures:

[Figure: radio back together, I cut a piece of foam pad in the front speakers, no effects, just to dust …]

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[Figure: Replace a new battery, S-2000 is very power …]

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S2000 3


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