Use a little radio experience Redsun 2100


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Music received the letter yesterday afternoon Electric Company sent RP-2100 radio. Machine number: 30220060500510; body code: 8712162. Random with a test machine at room temperature electrical properties of the data record are as follows:
Standard signal source: LEADER Model: 3216 Body Code: 8712162
FM Input Impedance 75 ohms

Unit Test Project test frequency limit of the normal indicators measured indicators Noise Sensitivity

S / N = 30dB 90MHZ uV 3 2
98MHZ uV 3 1.5
106MHZ uV 3 1.5

SNR (75KHZ) 98MHZ dB 60 65
Distortion 98MHZ% 0.2 0.2
Stereo separation 98MHZ dB 35 (R) 34dB 35 (L) 36MW

Loop antenna 50 EU limit noise sensitivity
S / N = 20dB 610KHZ mv / m 0.15 0.12
1000KHZ mv / m 0.15 0.12
1400KHZ mv / m 0.15 0.12

Image rejection (30%) 1400KHZ dB 66 71

SW limit noise input impedance 50 ohms Sensitivity
S / N = 20dB 3MHZ uV 5 4
6MHZ uV 5 3.5
10MHZ uV 5 2.5
25MHZ uV 7 6.5

Selective
10MHZ +10 KHZ dB 60 70
-10KHZ dB 60 66
Image rejection (30%) 10MHZ dB 46 53
SNR (60%) 10MHZ dB 50 61

Test person: Peng Xing Road test date :2006-5-11 review by: Redson Electrical Engineering Department (seal)

Today happens to be the weekend, free time is a pleasure to listen to radio! RP-2100 radio early in the morning and took another old machine (BCL-3000) with the “contest” for FM (FM) to accept. Condition is two machines are used to buy a new large battery.

First from the home balcony, the same direction: The main reception frequency is Hong Kong a few units, because some places in Zhongshan city, with the general Hong Kong radio station you want to receive the desired signal is more difficult. Unless set up an external (FM) antenna. Otherwise difficult yo! “Whether it is black or white, it catches mice is a good cat,” “an unknown machine regardless of brand-name machine, to receive the desired station signal unit in Hong Kong is a good machine.” Close FM89.5 in Hong Kong (commercial one), the two functions received, 3,000 have a cell signal, there are 3 cell signal 2100. 2100 sounds much clearer; in Hong Kong received (CR2) FM90.7, the 3000 has 2 cell signal, but the big noise. 2100 4 cell signal, it sounds not very clear, and then to the slow tuning speed by key words, the frequency of transferred 90.73 more clear. The same method also audition a few sets of frequencies: FM92.6, FM94.4 Hong Kong a; FM94.8, FM96.4 Hong Kong, two sets; FM97.8, FM98.9 Hong Kong, four; FM100 City 997 Taiwan , FM1025 Metro Finance. I think the use of 2100 to listen to clear more than 3000. Hong Kong, especially in a close FM92.6, FM94.8, FM96.4 Hong Kong, two Metro stations and FM100 at 997 units. 3000 machine receiving some interference from adjacent strong station sounds like a string of units, and interference with the 2100 machine when received strong selective good, clear sound no string units. Was chosen to test drive a few Hong Kong Taiwan, Hong Kong, Taiwan because of the signal by multiple sets of strong adjacent channel. To avoid the adjacent strong station machine, I think it is a good machine!

MW during the audition, the location is not listening to the balcony, but rather go to my office, outside the office environment is surrounded by four high-rise can be described as “embattled.” There is also a sitting area behind the mountain. In the first four indoor fluorescent, electric and other appliances turned angry. Hong Kong is also selected two medium-wave station AM621 and AM783 test, because my office received 621 and 783 within two signals are very weak, of course, is affected by other adjacent channel interference or other electromagnetic interference. The short-wave first gain control of two machine open to maximum, then the volume on the long, found very small volume of 3000, noise is also great, but 2100 is still very loud volume, and very clear. Shows that 2100 pairs of electromagnetic interference ability, sensitivity is very high!

In the short-wave band audition, listen to my place in the room next to the computer, listening to the band when she only listened to 12040KMZ American aficionados, but also a lot of users said in closing the station will be heard when the “drums “interference with the sound or some units. But with 2100 than 3000, when more than good, I do not know whether 2100 is the use of a PLL technology and 55.845MHZ high frequency of 2 reason? Listen to short wave low-noise 2100 Shihai find very low, some units such as the 12,075 French and Taiwan is simply the feeling of listening to FM!

Sound quality: 2100’s sound quality should be soft, clear bass, treble and bass layered. The 3000 sound sharp and not Naiting. This may be because 2100 is a 5-inch speaker, and there may be better after the amp’s sake. The 3000 speaker is 3 inches smaller on it!
2100 machine’s handle to mention I do not know how much endurance? Pull start every mention their always worried frightened to mention when broken, because the machine itself is heavy, single-handedly pull accidentally Wan put off, the machine fell off the big thing. Of course, I hope their fear is unnecessary, who have long believed that Redson had in mind. Oh!


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