Degen DE1103 radio design highlights ,Radio Reviews


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 DEGEN DE1103 3 DEGEN DE1103 4

DE1103 receiver performance is the absolute generalization, but DE1103 network sales price between 270 — 310 yuan, covering long, medium and short wave and FM radio receiver, the material price is not higher than 150. However, the performance ranked by short-wave receiver, the current domestic sales, China is still the production of radio it is probably the top three.

DE1103 is designed to be relatively inexpensive to build high-performance radio its FM radio reception is an ordinary line, while more complex, and it is the more prominent 1103 AM receiver is its treatment (coverage 100KHz-30MHz), only In key parts – the first mixer with a dynamic high (102 — 95dB of magnitude) is generally prepared to receive machine was used in field-effect transistor balanced mixer circuit, and the use of high-frequency double-conversion technology, in order to maximize performance, without the need of the other signals are suppressed at least 45dB more after the “clean” re-enter the radio signal is only 80-plus dB dynamic range of the radio chip to the back of ordinary handling in order to achieve lower costs.

Of course, as the battery-powered radio to listen to the main antenna rod pocket radio, DE1103 part of the control unit performance design trade-offs must be made four versions of the machines are different emphases. ① power as the first mixer is not working caused by the high mixing, and take the same machine or a mixer circuit is prepared to receive waste for at least 6dB compared to the radio dynamic ② SSB demodulator output in the beat frequency oscillator level is not prepared to receive machine according to the design ideas, there is a slight distortion of the solution super-SSB signal ③ to consider the whole 100kHz — 30MHz cost only a 5 with a low-pass filter circuit ④ No set up a special filter for the SSB . ⑤ same as cost considerations, some units doing enough to shield the circuit. These will be mainly as a SSB receiver to be the Mount Machine.
Antenna unit’s role in the receiving system is significant. The biggest advantage is the DE1103 can withstand 20-meter outdoor antenna without attenuation stayed! This is useful to improve shortwave reception role.
The first IF is 55.845MHz, the filter is a pass-band bandwidth 8KHZ around the quartz crystal filter plus an LC tank circuit, this configuration than for the 55.845MHz ± 20KHZ signal suppression at least 45dB! As radio chips the “sensitivity” is high enough, so it is not set in the first IF amplifier, before only the pull rod antenna signal amplifier and low-noise FET impedance transformation balanced mixer 6DB gain except the loss of several filter actually gain nothing left (after the words, before entering the radio chip, in fact, can cost tens of dollars spent to further improve reception performance).
Even the radio, for the second dynamic mixer circuit only requires 80-plus dB is sufficient, DE1103 of this clock is dynamically allocated and devices use low-cost high-performance under the idea of ​​universal design of radio essence! Personal that, DE1103 is designed to follow the principle of low-cost barrel of radio receiving equipment model

As a civilian radio, DE1103, there are many areas for improvement:
1, to strengthen the input signal filter;
2, the mixer circuit before the installation of the second AGC loop, sampling point 4 feet in the T601, the implementation of points in the antenna input, to ensure that the IP3 mixer circuit in the following work areas to work.
3, to strengthen the first IF filter.
4, the second IF filter to enhance
5, the antenna input attenuator plus
If, as with SSB amateur receipt of the letter with the entry-level machine, you must:
1, the antenna input plus amateur band frequency pre-LC tank circuit;
2, in the second IF SSB filter plus 455kH.

Why mention only DE1103, the reason is very simple – it is relatively cheap and there is a lot of HAM look down its performance, but it does have a certain dynamic, and its own SSB reception is singing class, if replacement The 455kHz narrow-band filter for the SSB filter in order to become real SSB demodulator. If you can do this step, I am afraid that the market made $ 800 DIY radio commercial kits are also difficult to reach it on the receiving performance of a level.


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