2009/07/30 22:06 | by 孤城浪子 ]
来源：http://info.awmn.net/users/images/stories/Library/Handmade/helical-helix%20antenna%202_4%20GHz%20HOWTO.htm
有空再翻译
Abstract
The helix antenna, invented in the late fourties by John Kraus (W8JK), can be considered as the genious ultimate simplicity as far as antenna design is concerned. Especially for frequencies in the range 2 - 5 GHz this design is very easy, practical, and, non critical. This contribution describes how to produce a helix antenna for frequencies around 2.4 GHz which can be used for e.g. high speed packet radio (S5-PSK, 1.288 Mbit/s), 2.4 GHz wavelans, and, amateur satellite (AO40). Developments in wavelan equipment result in easy possibilities for high speed wireless internet access using the 802.11b (aka WiFi) standard.
Theory in a birds eye view
The helix antenna can be considered as a spring with N turns with a reflector. The circumference (C) of a turn is approximately one wavelength (l), and, the distance (d) between the turns is approx. 0.25C. The size of the reflector (R) is equal to C or l, and can be a circle or a square. The design yields circular polarization (CP), which can be either 'right hand' or 'left hand' (RHCP or LHCP respectively), depending upon how the helix is wound. To have maximum transfer of energy, both ends of the link must use the same polarization, unless you use a (passive) reflector in the radio path.
The gain (G) of the antenna, relative to an isotrope (dBi), can be estimated by:
G = 11.8 + 10 * log {(C/l)^2 * N * d} dBi (1)
2009/07/20 15:03 | by 孤城浪子 ]
下载文件 (已下载 912 次) 2009/07/04 23:37 | by 孤城浪子 ]
3DMark06 v1.1.0 3DMark Score
3DMark (1280x1024, Default Quality)
芯片型号，注意标有SLI的是2块显卡组成SLI得出的成绩
3SLI的是3块显卡组成SLI得出的成绩 得分
- ATI Radeon HD 4870 CF 512 MB 14225
- ATI Radeon HD 4870 X2 2x1024 MB 14183
- ATI Radeon HD 3870 3CF 3x512 MB 14106
- ATI Radeon HD 3870 4CF 4x512 MB 14049
- ATI Radeon HD 4850 CF 512 MB 13931
- ATI Radeon HD 2900 XT CF 512 MB 13552
- ATI Radeon HD 3870 X2 2x512 MB 13441
- ATI Radeon HD 3870 CF 512 MB 13343
- ATI Radeon HD 3850 CF 256 MB 13069
- Nvidia Geforce 9800 GX2 2x512 MB 13064
- Nvidia Geforce GTX 280 SLI 1024 MB 13062
- ATI Radeon HD 4870 512 MB 12995
- Nvidia Geforce GTX 280 1024 MB 12951
- Nvidia Geforce GTX 260 SLI 896 MB 12938
- Nvidia Geforce 9800 GTX SLI 512 MB 12907
- Nvidia Geforce 8800 GTS SLI 512 MB 12870
- Nvidia Geforce 8800 Ultra 3SLI 768 MB 12826
- Nvidia Geforce 8800 Ultra SLI 768 MB 12755
- Nvidia Geforce 8800 GT SLI 1024 MB 12673
- Nvidia Geforce 8800 GT SLI 512 MB 12658
- Nvidia Geforce GTX 260 896 MB 12515
- Nvidia Geforce 9800 GTX+ 512 MB 12438
- Nvidia Geforce 9600 GT SLI 1024 MB 12321
- Nvidia Geforce 8800 GTS OC 512 MB 12183
- Nvidia Geforce 9800 GTX 512 MB 12042
- Nvidia Geforce 8800 GTS SLI 320 MB 11986
- Nvidia Geforce 8800 Ultra 768 MB 11894
- Nvidia Geforce 8800 GTS 512 MB 11814
- ATI Radeon HD 4850 512 MB 11749
- Nvidia Geforce 8800 GTX 768 MB 11198
- Nvidia Geforce 8800 GT 1024 MB 11113
- Nvidia Geforce 8800 GT 512 MB 11109
- ATI Radeon X1950 XTX CF 512 MB 10903
- Nvidia Geforce 7950 GX2 SLI 4x512 MB 10897
- ATI Radeon HD 2900 XT 512 MB 10679
- ATI Radeon HD 3870 512 MB 10399
- ATI Radeon X1900 XT CF 512 MB 10175
- Nvidia Geforce 9600 GT 1024 MB 9925
- Nvidia Geforce 8600 GTS SLI 256 MB 9789
- ATI Radeon HD 3850 256 MB 9454
- Nvidia Geforce 8800 GTS 640 MB 9226
- Nvidia Geforce 8800 GTS 320 MB 9111
- Nvidia Geforce 7950 GT SLI 512 MB 8735
- ATI Radeon HD 2600 XT CF 512 MB 8488
- Nvidia Geforce 8600 GT SLI 256 MB 8403
- ATI Radeon HD 3650 CF 512 MB 8244
- ATI Radeon HD 4670 512 MB 8095
- Nvidia Geforce 7950 GX2 2x512 MB 7921
- Nvidia Geforce 7900 GT SLI 256 MB 7570
- Nvidia Geforce 7800 GTX SLI 256 MB 7321
- ATI Radeon HD 2600 Pro CF 256 MB 7165
- Nvidia Geforce 7900 GS SLI 256 MB 7160
- ATI Radeon X1950 XTX 512 MB 6723
- Nvidia Geforce 7800 GT SLI 256 MB 6583
- Nvidia Geforce 7900 GTX 512 MB 6359
- ATI Radeon X1900 XT 512 MB 6183
- ATI Radeon X1950 XT 256 MB 6132
- Nvidia Geforce 7900 GTO 512 MB 6062
- Nvidia Geforce 8600 GTS 256 MB 5901
- Nvidia Geforce 8600 GTS 512 MB 5834
- ATI Radeon X1900 XT 256 MB 5810
- Nvidia Geforce 7600 GT SLI 256 MB 5705
- Nvidia Geforce 7800 GTX 512 MB 5686
- Nvidia Geforce 7950 GT 512 MB 5549
- ATI Radeon HD 2600 XT 256 MB 5178
- ATI Radeon X1950 Pro 256 MB 5162
- ATI Radeon X1800 XT 512 MB 5053
- ATI Radeon X1900 GT 256 MB 4951
- Nvidia Geforce 8600 GT 256 MB 4913
- ATI Radeon HD 2600 XT 512 MB 4883
- ATI Radeon X1800 XT 256 MB 4842
- Nvidia Geforce 7900 GT 256 MB 4725
- ATI Radeon HD 3650 512 MB 4703
- ATI Radeon X1950 GT 256 MB 4657
- ATI Radeon X1600 XT CF 256 MB 4653
- Nvidia Geforce 7800 GTX 256 MB 4605
- Nvidia Geforce 7900 GS 256 MB 4398
- ATI Radeon HD 2600 Pro 256 MB 4054
- ATI Radeon X1800 XL 256 MB 4030
- Nvidia Geforce 7600 GS SLI 256 MB 4017
- Nvidia Geforce 7800 GT 256 MB 3995
- ATI Radeon HD 4550 512 MB 3643
- ATI Radeon X1600 Pro CF 256 MB 3569
- ATI Radeon X1650 XT 256 MB 3515
- ATI Radeon X1800 GTO 256 MB 3453
- Nvidia Geforce 7600 GT 256 MB 3411
- ATI Radeon X1650 Pro 256 MB 2655
- ATI Radeon X1600 XT 256 MB 2648
- Nvidia Geforce 6800 Ultra 256 MB 2646
- ATI Radeon X1300 XT 256 MB 2636
- ATI Radeon HD 3470 256 MB 2634
- Nvidia Geforce 8500 GT 256 MB 2378
- ATI Radeon X800 XT 256 MB 2339
- Nvidia Geforce 6800 GT 256 MB 2302
- Nvidia Geforce 7600 GS 256 MB 2293
- ATI Radeon HD 2400 XT 256 MB 2177
- ATI Radeon X1600 Pro 256 MB 2028
- ATI Radeon HD 3450 256 MB 1799
- Nvidia Geforce 8400 GS 256 MB 1640
- Nvidia Geforce 7300 GT 256 MB 1612
- Nvidia Geforce 6600 GT 128 MB 1519
- ATI Radeon HD 2400 Pro 256 MB 1490
- ATI Radeon X1300 Pro 128 MB 1261
- Nvidia Geforce 7300 GS 128 MB 950
- ATI Radeon X1300 256 MB 949
以上型号不包括移动型和整合型芯片组,如需查看全系列芯片对比，请看这里： NVIDIA & ATI全系列显示卡性能分级对比表
2009/07/03 00:40 | by 孤城浪子 ]
| 英特尔Atom N270 | 英特尔Atom N280 | |
| 架构 | Diamondville/Silverthorne | Diamondville/Silverthorne |
| 核心 | Intel(R) Atom(TM) CPU N270 | Intel(R) Atom(TM) CPU N280 |
| 主频 | 1.6GHz | 1.66GHz |
| 前端总线 | 533MHz | 667MHz |
| 二级缓存 | 512KB | 512KB |
| 指令集 | X86,MMX,SSE,SSE2,SSE3,SSSE3 | X86,MMX,SSE,SSE2,SSE3,SSSE3 |
| SuperPI 104万位 成绩 | 95秒 | 91.5秒 |
2009/06/03 18:56 | by 孤城浪子 ]
安装注意：
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