Anjan A-1220 double-conversion radio,Radio Review


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Double-conversion technology has been the focus of attention of many manufacturers, so let’s talk about what is double-conversion, in order to improve radio receiver sensitivity, selectivity and anti-jamming capability The high-end receiver, using the double-conversion scheme: first the received signal into a higher frequency of the first IF, IF single-conversion FM radio is 10.7MHz effective to prevent clutter mirror interference.

The first intermediate frequency is relatively high, relatively poor selectivity of the receiver, the mirror frequency interference is inevitable. If a radio frequency is 10.7MHZ This radio signal can be without the tuning circuit directly into the IF amplifier. Adjacent frequency interference will be very serious. In order to reduce this interference. Again, double-conversion into the second intermediate frequency of 465KHz to ensure that the selectivity of the receiver. The double conversion technology can suppress the mirror frequency interference and improve receiver sensitivity. Three or more frequency conversion.

We can see that double-conversion radio selectivity and anti-mirror to a certain extent to the ability of high-performance double-conversion radio manufacturers have also introduced a lot of, for example, the Tecsun the R9700 9702 Degen DE1102 1103. The Anjan company also joined in 2005, double-conversion radio developed and launched such as A1236 1239 1206 such as a series of machines, which Anjan A-1220 is one of a.
Anjan A,-1220 is an analog pointer tuning machines with shortwave, FM stereo receiver, the appearance of the drawing process, feel good mix of different colors for different groups of people to appreciate the need, the radio signal strength, stereo, power and so on through 3 light of different color light-emitting diode display, antenna, a total of eight well qualified for the general reception Unfortunately, Anjan A-1220 there is no external antenna jack for outdoor antenna friend is not very convenient.

1220 the technical indicators are:

FM :76.0-108 .0 MHZ
MW :525-1610KHZ
SW :5.95-17: 90 MHZ
Short-wave first intermediate frequency: 10.7MHZ
Shortwave two intermediate frequency: 455KHZ

Noise limited sensitivity:
FM: better than 10uv
MW: better than 1mv / m
SW: better than 30uv

Single-signal selectivity:
Better than 20dB
Size: 115X72X23mm.

The key test receiver performance.

Anjan A-1220

Anjan A-1220 20

FM, medium wave mobile reception performance testing
Time: August 2007 Location: Chongqing, south bank, bus
Environment: Chongqing local FM signal is strong, a great help for the perfect mobile reception.

Key test: strong Taiwan 88.1 93.8 95.5 96.8 101.5 field weak 107.1 94.7 99.1 105.1 MW strong: 9811314

Reception quality is divided into to enjoy the level ■ ■ ■ (low noise) audible level ■ ■ (little noise) difficult level ■ (noise)

Anjan A-1220

Summary: A-1220 received strong Taiwan has a good performance, stereo background noise is very small, but for the field weak selectivity and signal causes, the noise is relatively large. MW due to the sensitivity of the reasons, with a strong direction, to be improved.

Anjan A-1220 Anjan A-1220 2

Second, the performance test

The outskirts of receiving
  Time: August 2007 Location: Chongqing Banan Huimin
  Environment: Chongqing local strong mountain blocking, signal greatly attenuation, sensitivity on the test machine, in particular, short-wave of great help
Involved in contrast to the machine: the Tecsun R911 / Degen DE1102

The reception quality is divided into: enjoy the class ■ ■ ■ (low noise) / audible level ■ ■ (with a little noise) / difficult level ■ (noise)

Anjan A-1220

Urban areas to receive
Time: August 2007 Location: Chongqing Nanping
Environment: Chongqing local FM strong shortwave will shield the poor machine interference is also a test of machine performance when

Machines involved in the comparison: Degen DE1102 Desheng 912 Peter Long 901

Reception quality is divided into to enjoy the level ■ ■ ■ (low noise) / audible level ■ ■ (with a little noise) / difficult level ■ (noise)

Anjan A-1220

Summary: Anjan A-1220 for local strong reception is very good stereo separation and high background noise is very low, the sound quality is also very good, medium wave directivity is strong, lack of sensitivity, the good results of short-wave strong, weak units receiving a lack offound no mirror.

Anjan A-1220

Third, the Comprehensive Test

1 sound quality
The lack of A-1220 speaker sound, open a great break the sound needs to be improved.

Annex – earplugs

A-1220 comes with the ear test to test the sound quality CD player Fashao Die

Use different music test results: the bottom-heavy sound medium needs to be improved and good treble, is good as an attachment.

(3) anti-mirror and anti-jamming

Mirror: A-1220 of the mirror to the distribution in the 76-108, are the interference of the local strong Taiwan

Anti-interference: In the receiver away from the computer is less than 1 m, the FM strong interference is very small, weak sets of interference increases, the Polish drowned in a noise.

(5) the appearance of wear and tear

A-1220 tested a little wear and tear, the level of technology needs to be improved.

6. Background noise

The background noise is most concerned about a lot of friends, A-1220 receiver background noise is very low, the outstanding performance

7 Price

The price is a major consideration for the purchase of radios, not too expensive, too cheap and no one will believe how good this machine’s performance, so a moderate price is the best, A-1220 price, price is good.

Anjan A-1220

IV Summary

A-1220 is a good value for money machines, due to a double-conversion, short-wave mirror to reduce, but the sensitivity is not very high, so I hope that the selective lack of increase in short-wave sensitivity, but the FM, resulting in signal strength formed where the mirror to the interference, FM selectivity is still necessary.

Tuning of the machine feel very good stereo separation, the background noise is very small, and the bass dive deep enough, the details section of the machine in the appearance of lack of performance, process the lack of speaker sound quality to be improved within the welding process is also to be improved, another good lighting at night is not done, the uneven distribution.

Color to see the frequency is not very convenient, changed to dual-lamp illumination, the light distribution around the dial, using the orange looks more comfortable in the evening, but also should increase the external antenna input. A-1220 for general reception or sufficient for the DX, or lack of. Hope to see the Health and Safety more boutique!

Anjan A-1220

Fifth, comprehensive evaluation

A performance index FM ★ ★ MW ★ ★ SW ★ ★

2, the sound quality index FM ★ ★ ★ ★ MW of of the SW ★ of ★ ★ ★ ★ ★

3, the consumption index ★ ★ ★ ★ (higher is better)

Mass index ★ ★ ★

5, after-sales service ★ ★ ★

6, the collection index ★

7, the price index ★ ★ ★

8, the DX index ★ ★

(Note: up to 5 stars)

Attachment: machine number: 1220050900980 ANJAN / test battery: Charge -1 300 mA battery / test sites: Chongqing / test: August 2007


Sample/Wholesale
Price
Shipping
Carrier
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pcs sample
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pcs
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One Response to Anjan A-1220 double-conversion radio,Radio Review

  1. Hey lovely from a girlyfan maintain the fab writing

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