【正文】
module, in terms of receiver sensitivity, or selectivity have greatly improved in significantly more interference. 。 超外差接收機(jī)電路和超外差收音機(jī) 具有 相同的工作原理。上面的例子說明,無線設(shè)備的發(fā)送和接收 有 更好的傳輸性能,而且會大大降低衍射的性能 。不同的電 路參數(shù),具有不同的傳輸功率和傳輸距離 ,為了 獲得更好的效果,必須被連接到一個天線 上 ,選擇最佳的天線導(dǎo)線 通常為 25 厘米長,最長距離的傳輸是可以設(shè)置的,因?yàn)闊o線電信號傳輸 時 是受多種因素的影響,所以從標(biāo)稱只有一半或更少實(shí)用距離 時 ,需要開發(fā)來觀察。 DF 數(shù)據(jù)發(fā)射頻率為 315M ,采用 SAW 諧振器的 穩(wěn)定 頻率, 具有 高頻率 的 穩(wěn)定性,在 25 ? 85 度 之間 變化,僅僅為 3ppm / 176。 通過用調(diào)制信號為調(diào)頻波,其平均功率等于最大功率瞬時 FM 載波頻率的變化值, FM 發(fā)射系統(tǒng) 。 而最大運(yùn)營商唯一動力相當(dāng)于一半(當(dāng)調(diào)制指數(shù) MAM = 1 時)。附件 1:外文資料翻譯譯文 智能競賽搶答器 無線電發(fā)射設(shè)備都工作在無線電頻率,因此 對 設(shè)備的要求較高,一般 都 是 在 非常困難的生產(chǎn)和檢驗(yàn)工作的條件下完成的,而目前的無線技術(shù)的應(yīng)用越來越廣泛,特別是對于無線電愛好者多項(xiàng)業(yè)務(wù) 來說 ,為了使所有的高頻檢測設(shè)備 達(dá)到標(biāo)準(zhǔn) 幾乎是不現(xiàn)實(shí)的,因?yàn)樵O(shè)備非常昂貴。 MFM 調(diào) 制系數(shù)越大, 不僅 它的 邊緣系數(shù) 更加頻繁, 而且 增加的速度 越快 ,這意味著在電力載波頻率為動力 的情況下 ,AM 頻率波功率 越大 , 則邊緣系數(shù)越大。對于中,長波頻段( MW:1000100M,長波 101公里), 則需要 使用 AM 或 SSB 調(diào)制的。調(diào)幅收發(fā)組件, 雖然 它的成本較高, 但是產(chǎn)生了 更多的方便,所以 在 當(dāng)前廣泛使用的形式 之下 是 性價比不太高的 ,使用這種模式,本文還重點(diǎn)推出這個模塊 — 無線發(fā)射模塊 。當(dāng)電壓和功率的增加大于 l2V 的,有效輻射功率沒有明顯的改善。為了實(shí)現(xiàn)可靠的函數(shù)調(diào)用,我們增加了信號放大中繼器 的效果后 實(shí)現(xiàn)的功能和中繼器 相同 ,這里所說的是我們的網(wǎng)站,介紹高功率無線信號中繼器。高層次的電路元件可再生相關(guān)的檢測器電路,通過縮放級別來處理運(yùn)算放大器的輸出信號輸出到無線接收器 來檢測信號 。c Particularly suitable for a collection of multiple wireless re mote control and data transmission system. SAW resonator frequency stability after the crystal, and general LC oscillator frequency stability and consistency of poor, even with highquality finetuning capacitance, temperature changes and vibration has been transferred it is difficult to ensure good frequency point migration will occur. DF does not have code to launch module integrated circuits, and an increase of a data modulation transistor Q1, such a structure can be easily made it, and other fixed coding circuit, a rolling code and singlechip interface circuits, without having to consider the work of coding circuit voltage and output value of the size range of the signal. For example, using PT2262 or SM5262 matching circuits, such as coding, the data directly to the output of their first 17 feet then to DF data input module. DF data module has a wide operating voltage range 3 ~ 12V, when the voltage changes in firing frequency is essentially the same, and the transmitter module of the receiver module supporting the need for any adjustment will be able to receive stable. When the firing voltage of 3V, the open transmission distance to about 20 ~ 50 meters, less transmission power, when the voltage of 5V is about 100 ~ 200 meters, when the voltage of 9V is about 300 ~ 500 meters, when fired when the voltage of 12V for optimum operating voltage, with the launch of better results. When the voltage and the power increase is greater than l2V, effective radiated power not markedly improved. Different circuit parameters, have different transmission power and transmitting distance, the launch in order to obtain better results, must be connected to an antenna, choose the best antenna wire 25 centimeters long, the best longdistance transmission can be erected, because the radio When signal transmission is affected by a number of factors, so the general practical distance from the nominal only half or even less, this point needs to be developed to observe. DF data module using ASK modulation mode to reduce power consumption, when the data signals to stop when the emission current zero, the data signal transmitter and DF input resistance can be used or can not be directly connected to capacit