TECSUN BCL-3000 evaluation


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In January 2003, Germany launched a domestically produced raw concept of the first BCL radios BCL-2000, two years after the launch of the BCL-2000′s improved product BCL-3000.
BCL that “amateur radio” means, BCL radio is designed specifically for amateur radio products, these products are characterized by: large size, excellent reception, good sound quality, the application of more than ordinary radio technology, have a more flexible tuning. BCL radio in the early 1980s, Japan emerged, typical products are Panasonic FR-2200 and FR-2800 and so on. BCL Radio Radio in the current domestic market is also the only German students a production.
BCL-3000 compared to BCL-2000, in addition to maintaining the original style, while the merits of using microcomputer control chip controls the common short-wave radio frequency drift, an increase of FM stereo headphone output decoding. The products are excellent reception and sound quality in 2005 was broadcast internationally renowned magazine “PASSPORT” as 2.250 stars.
(A), the appearance of process and product specifications
BCL-3000 is a portable nature of a quasi-desktop radio, the actual size of 275 × 175 × 87mm; the actual weight of about 1.5 kg, compared to other radio products to be large. BCL-3000 with deep black and metallic red two colors, black, dignified and elegant, beautiful bright red. BCL-3000 provides four 1 battery, 6V DC and 220V AC three kinds of power supply. Battery-powered, the actual measurement of quiescent current of 79 mA, the lowest dynamic current of 89 mA, the maximum dynamic current over 200 mA. From the above data point of view, BCL-3000′s power consumption is much higher than analog tuning radio with digital tuning radio power consumption quite.
(B), the basic features and unique elements
BCL-3000′s biggest advantage is its sound quality and reception. In appearance, the style of a professional receiver. Appropriate machine size, can be a desktop use, with an additional strap is suitable to carry out. The application of four BCL Radio technology features.
FM AFC (Automatic Frequency Control) manual on-off function: FM radio frequencies by the rate of change is to pass the sound signal, each station must occupy a wide frequency bandwidth. And receiving, only transferred to the center, in order to ensure minimum sound distortion. Therefore, each FM radio circuit, there are automatic frequency control, automatic transferred to the receiving station to ensure that the center frequency, high-quality voice restored. But the AFC also affects the weak FM station to receive long-distance, strong units with AFC to “strong” bully “weak”, the receiving frequency is always pulled their frequency midpoint. Thus, in the open state of the AFC, can not receive a strong long-range weak units near the station! To FM DX (distance reception), BCL-3000 using the AFC manual on-off function, so that FM DX world more exciting.
AM bandwidth selection function: BCL-3000′s, the short-wave filter bandwidths are: broadband about + /-8kHz, narrow-band of about + /-5kHz two. AM bandwidth selection can improve the short-wave signal selectivity and sound quality. When the AM signal is stronger, better reception, you can choose to receive AM broadband will get a better reception quality; when the AM signal is weak, disturbed, you can choose narrowband AM receiver, in order to improve selectivity and reduce interference.
AM gain manual control: As the AM signal (especially short-wave signal) strength far and transmission intensity fluctuation is too large, far more than the radio frequency amplifier automatically adapt to the high range, but to artificially control the high frequency amplification The amplification circuit, so as to restore to be able to adapt to external signals. Not only can improve the radio’s resistance to strong signal overload capability, you can receive the signal changes with the best gain real-time control effect.
SW LPF (low pass filter RF) control: As the past 10 years, above the average city, with more and more widely used high-frequency radio, high-frequency radio spectrum on the FM radio signal is increasingly filled with high-frequency television signals and a variety of civilian communications signals, seriously interfere with shortwave listening. BCL-3000 increased the low-pass filter is to suppress these effects of high-frequency short-wave signals. The short-wave short-wave low-pass filter can reduce the background noise and clutter.
In addition to these four technical functionality, BCL-3000 also has a clock instructions, regular boot, sleep, auto power off function, a special increase in frequency tuning, high bass tuning, stereo audio output, a variety of power supply, an external antenna input, battery residual signal strength indication and indication functions.
(C), operating experience and reception
BCL-3000 AM step of the 1kHz, FM radio, like the ordinary step 0.1MHz;, enough fans and ordinary radio receiver remote receiver. The digital display products for the analog tuning radio, the digital tuning radio frequency stability over a larger gap. BCL2000 frequency drift for the more serious phenomenon, tecsun clever use of microcomputer control chip on the frequency locked to a certain extent, control of short-wave frequency drift phenomenon, solve the problems of lovers for years, this is a very innovative design !
By contrast, BCL-3000 medium wave radio reception 5 ranked first, and obvious advantages. Expressed as sensitivity, signal to noise ratio is high, the background noise is very low. In the short-wave receiver, the other four machine rather, signal clarity and speech intelligibility slightly behind the DE1103, but in the short-wave external antenna case, BCL-3000 showed a better dynamic. In contrast to the FM receiver, BCL-3000 sensitivity than the PL-550 and DE1103 slightly lower, but higher than R-9700DX and DE1107 good. Overall, BCL-3000 receiver performance is still firmly in the forefront of domestic radio, is to receive one of the best performance of the domestic radio.
(D), dynamic stereo sound features and
Large volume, good sound quality, high dynamic is the BCL-3000 is one of the main features. BCL-3000 using 4-inch speakers, and with the BTL amplifier, the output power of 1000 mW, almost three times the ordinary portable radio. BCL-3000 also has independent bass and treble adjustment, tone dynamic large, BCL-3000 sound better than ordinary portable radio, or even less than before the blockbuster “8080″ tape recorders.


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