Redsun RF21000 preliminary report using radio


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Time is like water, I went to the Forum has for many years, in the years I have slowly grown widely altar, and the pursuit and appreciation of the level of radio is gradually increased, from blind to the rational purchase treatment, through a process. Radio for the general public is a kind of entertainment, often as long as one can, but for our group of enthusiasts, but it is a feeling, a desire to share the meet, is the pursuit of modern technology , is the nostalgia of past years, is a childhood favorite can not have the emotional make up the machine … so our group of friends on the radio fanatical pursuit of a machine for every plus there is always sought after!

However, soon after when, suddenly has cropped up a new radio manufacturers ———– Redson appliances which professional-delayed production of radio, as fans of me, naturally the company’s very interested in the product, then under a single ordered the company’s RF2100 radio, after two days of waiting, the STO to the machine to my hands! When I opened the box, I feel not very excited, serious love The machine’s appearance, and German students BCL2000 it similar, but head a little to big, black plastic casing, huge LCD screen, button layout more reasonable and humane, housing production process is acceptable attachment process is not perfect! Only one power cord and two plug the machine is still a problem can not be picky! Appearance of the machine concept of BCL radio! Like southern beauty, elegance and have a meaning, her people should taste like a cup of green tea before Guyu is so fresh, she like at the child, makes love with Canada … …

The aircraft’s technical specifications:

■ full-band digital tuner (PLL) radio, the use of a microprocessor (MCU) control, can control the display the radio frequency, local / world time, battery capacity, radio signal strength.
■ the main function device 8 independent high-quality integrated circuit chip and eight high-performance FET to form a high performance radio circuits, with high sensitivity, anti-interference ability, low background noise, distortion and so on.
■ FM Range: 87.00-108.00 MHz, AM range :520-1710 kHz (10K system) ,522-1620 kHz (9K system), shortwave 1 range :1711-10010 kHz, shortwave 2 range :9990-20010 kHz, shortwave 3 range :19990-29999 kHz.
■ Setting FM and shortwave external antenna jack, the remote receiver can also connect to the local FM Cable Radio Network (CABLE FM). 500Ω AM for an independent external day / ground port, you can use an external antenna and ground, to improve AM reception.
■ FM accuracy of 10 kHz, amplitude accuracy of 1kHz.
■ Set a AM IF output can be used for other extensions such as the AM band: CW (T), SSB (single sideband), DRM (Digital AM radio), SSTV (Slow Scan TV) and so on.
■ High frequency AM band to take (55.845MHZ) of the double-conversion PLL technology, has a very good anti-imaging capability, short is better than 40dB (100 times), medium wave is better than 60dB (1000 times). FM is better than 46dB (200 times)
■ the use of FET balanced mixer, AM tuner built-in digital tracking technology, Built-in strong short-wave signal interference, so that AM has a very good anti-jamming capability.
■ ad hoc MW / SW selectable wide / narrow IF bandwidth, but also according to the strength of radio signals to adjust the high-level gain (RF GAIN), in a different electromagnetic environment to facilitate the best reception received.
■ Digital knob (fast / slow / lock) tuner radio frequency functions.
■ two-time beep, boot trouble ring function, snooze function, programmable sleep timer function.
■ Key beep function selection key lock function.
■ listen to FM stereo with headphones. Users also can listen to the situation, the FM stereo, in order to obtain a higher signal to noise ratio.
■ Set the left / right channel line output jack, can put the machine as a tuner, connect the audio amplifier to achieve better reception quality.
■ selection of high-quality 5-inch speaker and BTL audio amplifier integrated circuit, set up an independent bass and treble controls, the use of different sounds to meet the requirements.
■ display with backlight, you can manually select the Always / 8 second lights-out two kinds of lighting the way; take light button, the switch can control the keypad backlight.
■ You can use an external AC power supply (220V) / external DC power supply (6-9V) / 4 节 R20 (large) / / 4 AA (5 No.) battery-powered four ways, rechargeable battery rechargeable function. Size: 290 (L) X185 (W) X70 (D) mm
■ machine noise sensitivity: FM better than 5 micro-volts, 0.2 MW is better than high V / m, short-wave than 20 microvolt. FM single-signal selectivity: Broadband as 40dB (100 times), narrow-band as 60dB (1000 times).

Battery box with the machine back 10K and 9K step selector switch, the machine there is a major feature, the battery can choose from 4 AA batteries or 4 1 battery, in the left side of the fuselage has a battery switch , more innovative, the design is very humane! in the right side of the fuselage light switch, you can turn the auto light switch, it saves battery power, there away short-receive switch, antenna and a body and an external antenna switch, this will give full play to the performance of the antenna! the top of the machine there is a snooze and light switch light switch!. back of the machine is the battery pack and antenna input input terminals, one of the Polish antenna output terminal is used for: setting a AM IF output can be used for other extensions such as the AM band: CW (T), SSB (single sideband), DRM (digital AM radio), SSTV (Slow Scan TV) and so on. But the need for external hardware support! Now is useless!

Talk so much of technical indicators, which tell the receiving machine performance, to be honest, technical indicators are man-made, truly reflect the performance of the machine to accept the good and bad, good reception is the last word! As the radio, mainly to receive Performance is the most important, after several hours of trial and found that the sensitivity of the machine is very good Polish, and German students BCL2000 be one to! geographical location of my very good – Jiaxing-Huzhou plain, in Hangzhou wave radio broadcast is used in stereo, 810 and 954 reception quite good, the sound is very beautiful, the people here I can receive Radio 738 kHz Shaoxing, Jiaxing, People’s Radio 657 kHz, 927 kHz Jiaxing economic units, Huzhou Economic Taiwan 927 kHz, 576 kHz, Zhejiang People’s Broadcasting Station, Shanghai Oriental Radio 792 kHz, 864 kHz Jiashan People’s Broadcasting Station, News Channel 873 kHz, Huzhou, Zhejiang Arts Taiwan 1050 kHz, Hangzhou, Zhejiang People’s Broadcasting Station foreign language station 1071 kHz, Zhejiang People’s Broadcasting Station 1080 kHz. Some of these radio signals are very strong, complete and BCL2000 play tied, but the sound is good too B2K, received units than B2K should be clear point! In Shanghai received 792 kHz, the sound is quite good, and the German-born B2K as clear sweet In the Polish stage, the effect of weak students to be better than Germany, B2K, this should be the way and the machine is used PLL tuning, of course, the relative B2K simulation shows higher precision! This is no way!

Of course, was talk that the medium wave frequency modulation, and the machine is very good that FM sensitivity is high, the machine uses a large 5-inch 8-ohm speakers, so the effect is very good, a lot here to receive FM radio : 106.5 Deqing People’s Radio Station, 100.4 Fuyang People’s Radio Station, 96.0 Haining People’s Broadcasting Station, 106.0 Haiyan People’s Broadcasting Station, Hangzhou, People’s Radio 91.8 Voice of the economy, 93.0, Zhejiang People’s Radio Voice of Transportation, Hangzhou, Zhejiang People’s Radio 95.0 Economic Taiwan, Zhejiang, music FM FM96.8, 99.6 Zhejiang People’s Broadcasting Station art station, radio station 102.1 beauty of Yuhang, Zhejiang People’s Broadcasting Station 103.2 music station, 105.4 Hangzhou People’s Broadcasting Station Xihuzhisheng, 107.0 voice of the city, Zhejiang, People’s Huzhou Huzhou 98.5 FM radio art, People’s Radio Station 99.3 Jiashan, Jiaxing, suburban radio stations 88.2, 92.2 Jiaxing Economic Broadcasting Station, Shaoxing, Shaoxing traffic radio station 89.7, 94.1 FM radio station of Shaoxing City, Shaoxing People’s Radio Station 96.0, 104.0 FM radio station of Shaoxing County, Shaoxing County FM radio station 106.0, 97.1 Tongxiang People’s Broadcasting Station, People’s Radio Station … 107.9 … Xiaoshan FM signal is quite good, very rich program, but unfortunately the old Military too much! it seems this machine in FM performance is also commendable! and Germany Health B2K belong to the same grade!!!

In short terms, B2K’s criticism that there is no body in the shadow of the machine, after all, is the use of PLL tuning mode, there is no problem of frequency drift, this is the most gratifying thing was! Short-wave signal is the use of the ionosphere as a medium to spread broadcast signal, the signal stability with the ionosphere and change, by the environment, climate and other factors affect the larger, so the short-wave signal has its own characteristics, coupled with China for several decades, “folk music” interfere with, let’s BCL enthusiasts to find ways to improve the short-wave receiver to receive skills and performance, such as the use of high-frequency double-conversion, was born in Germany on 350 variable frequency techniques used to improve receiver sensitivity and radio-noise ratio, set up an outdoor antenna and so on. The music is the second letter RF21000 conversion machine, so the short-wave receiver on more than Desheng B2K good is normal, only to find my test results satisfactory, and 1103 received a slight contrast difference, but it is not. Weak short-wave station in 1103 received a little better when the noise control, noise floor than the 2100 low. Radio to the present, technology, and lines are already quite mature, more and more accurate component parameters, so the gap will be too general, in fact, radio designers are famous master masterpiece, Degen 1103 is the boutique of the week for work. In the short-wave receiver respectively at the high end, low end to do to receive the light function to receive the letter of 21 000 music can still receive, but not in 1103 when the weak signal handled well, a little background noise is relatively large, relatively little sensitivity, signal to noise ratio less favorable than the reference machine, which is an indisputable fact, when the machine on the assessment to be fair and just and reasonable, not biased, as not with a preconceived point of view a large, floating through the frequent use of the phenomenon is not found. As Desheng B2K is recognized king of drift, so a test on my shortwave receiver is a radio station to receive the same judge, and received the same radio station, or music signals show strong letter machine, sound is music believe the machine is good, high-definition!

There are aircraft in the anti-electromagnetic interference, there is comparatively good performance, I received at work, as usual, I start to listen to in my office building, the inside has thousands of computers running a complete LAN at work, there are so many fluorescent lights, energy saving lamps, electromagnetic interference is very serious, can be a radio graveyard, but the machine is still tough work, received a lot of clear signals, can basically meet the requirements to listen to ! the aircraft fuselage is also equipped with stereo left output terminal can serve as a tuner, with stereo power amplifier, to obtain a higher signal to noise ratio!

A general machine work, can not be considered fine, then every large, rough mold, room for improvement! There are not as good as the machine with a strap Desheng BCL2000 way, the machine uses a relatively small handles, can be put down, but feel put off easily in your hand! sorry is not configured power supply!

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