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標題: 咩叫 Spread Spectrum? [打印本頁]

作者: DriftNoobie 時間: 2008-3-6 19:58
標題: 咩叫 Spread Spectrum?
Novak GTB Brushless ESC 有隻新 model 話有 Spread Spectrum, 咩黎?

作者: kwok7660 時間: 2008-3-6 20:06
出o左好耐 lu
係專比 2.4G 接收用

http://www.teamnovak.com/product ... spectrum/index.html

作者: DriftNoobie 時間: 2008-3-6 21:13

原帖由 kwok7660 於 2008-3-6 20:06 發表

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出o左好耐 lu
係專比 2.4G 接收用

http://www.teamnovak.com/product ... spectrum/index.html

專比 2.4G 用? 正! HK 有無貨? 同 regular GTB 一樣價?

作者: kwok7660 時間: 2008-3-6 21:46

原帖由 DriftNoobie 於 2008-3-6 21:13 發表

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專比 2.4G 用? 正! 係 (因為我兩樣都用緊)

HK 有無貨? 有

同 regular GTB 一樣價? 應該差不多唔記得LU

作者: ellis 時間: 2008-3-6 21:46
Since spread spectrum technology uses a much higher frequency, 2.4Ghz to be precise, this has allowed Novak to finally unleash the full potential of the GTB speed control. Both new GTB models now have significantly faster MOSFET switching speeds, which provide improved performance and cooler operating temperatures. In short, the ESC gets power and increased operational efficiency at the same time!

kws 有貨啦, 同舊款真係差不多$$, 因為..........我都用緊

作者: jasonwong 時間: 2008-3-7 21:57
Frequency-hopping spread spectrum (FHSS) is a spread spectrum technique that uses frequency agility to spread the data over a minimum of 75 and a maximum of 79 MHz (small frequency carrier space) carrier frequencies in the 2.4 GHz (2.402 GHz to 2.480 GHz) Industrial Scientific Medical (ISM) band. FHSS uses GFSK (Gaussian Frequency Shift Keying)

作者: jasonwong 時間: 2008-3-7 21:58
Direct Sequence Spread Spectrum, DSSS

DSSS is a method of sending data in which the transmitting and receiving systems are both on a 22 MHz-wide set of frequencies.
transmit more information at a higher data rate than current FHSS systems
A DSSS signal is more susceptible to narrowband interference than FHSS because the DSSS band is much smaller (22 MHz wide instead of the 79 MHz wide band used by FHSS) and the information is transmitted along the entire band simultaneously instead of one frequency at a time.

作者: kevin 時間: 2008-3-8 02:00
DSSS , FHSS 邊個好D呀師兄

作者: jasonwong 時間: 2008-3-9 00:56

原帖由 kevin 於 2008-3-8 02:00 發表

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DSSS , FHSS 邊個好D呀師兄

應該FHSS係適合用係RC car多d.....因為佢可以FHSS有frequency-hopping, 可以存在更多band, 一有相同佢就會跳過

作者: jasonwong 時間: 2008-3-9 00:57
An advantage of FHSS over DSSS is the ability for many more frequency hopping systems to be co-located than direct sequence systems

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