二十五、自动频率控制 (AFC Control Range-3dB) (±250KHz-±200KHz) 先测好98MHz最大灵敏度,再增加发生器输入电平至60dB,关小音量至标准输出2V,再上偏调数码输入频率至输出降低-3dB,此时数码上偏调频率加上,下偏调降低3dB时的频率,即为被测机的自动频率控制。 二十六、通频带 (-6dB Band width) (10KHz...
23、成,如下图所示:5、概述AM/FM收音机的三种电路程序1)FM天线2)FM(FM第一中放管兼AM变频,,FM第二、三中放管兼AM中放,低频部 分仍然共用的FM/AM方框图。)FM(高中频部分分开,仅低频部分共用的 FM/AM方框图) 二、重要指标定义、标准及具体测试方法1、FREQUENCY RANGE 频率覆盖范围(高端、低端)1)标准:LEN...
BANDFMMWFMMWLWFMFMAMFMAMFMFMAMFMFMFMMWFMAMFMAMFMOIRTMWLWFMOIRTMWFMOIRT FrequencyRange87.5~108MHz522~1620kHz87.5~108MHz522~1620kHz144~288Khz87.5~108MHz87.5~108MHz520~1710kHz87.5~107.9MHz530~1710kHz87.5~107.9MHz87.5~108MHz520~1620kHz76.0~90.0MHz87.5~108MHz87.5~108MHz531~1602kHz...
1、FREQUENCY RANGE(频率覆盖范围) A、定义:指收音机所能接收频率的范围。标准:520KHZ~1730KHZ;LIMIT:530KHZ~1700KHZ;频率覆盖宽一些可接受。(SPEC:+10KHZ) B、测试方法及条件一词制频率1KHZ,调制度30%,RF信号强度86dB,音量输出标称电压,EQ放中间。 a)首先将PVC转到最低端,然后调整高频信号发生器频率使信号接...
FM AM (高中频部分分开,仅低频部分共用的FM/AM方框图)二、重要指标定义、标准及具体测试方法 1、FREQUENCY RANGE频率覆盖范围(高端、低端)标准:LENOXX,LIMIT:88MHZ~108KHZ,NORMAL:87.5KHZ~108.5MHZ,允许宽一些(1KHZ)测试条件:音量 标准输出(失真最小调谐,EQ置中间) RF信号强度→60dB,调制频率:1KHZ,频偏:+22.5...
A5. The Cover Range depends on 4 factors:1. Power from Transmitter; 2. Height of Antenna; 3. Gain from Antenna; 4. Around Environment.Then we can know the cover range of your station.Q6. Is the Frequency Adjustable?A6. FM Radio Band Frequency is 87~108MHz, TV Band Freq...
1.1.2高低端接收频率范围(头尾FREQUENCYRANGE) 把被测机调谐调至低端尽头。高频信号发生器发出520 (522/531)KHz信号。微调高频信号发生器的输出频率, 直到被测机输出波形失真最小。记录此时高频信号发生器 的频率。高端测量方法,把被测机调谐调至高端尽头。高 频信号发生器输出频率为了1740KHz(美国机),1620KHz (...
Then we can know the cover range of your station. Q6. Is the Frequency Adjustable? A6. FM Radio Band Frequency is 87~108MHz, TV Band Frequency includes UHF/VHF band. For FM Radio Transmitter; Power Below 2KW is all adjustable. Above 2KW would be narrow. For TV Transmitter; all Freque...
2.FM frequency range: 70~108.0MHZ MW frequency:522~1620KHZ SW frequency:3.9~22.2MHZ Accessories: 1x C3 Speaker 2x 18650 battery 1x Charge cable Some instructions for use: Short press”MP3”key:switch between Bluetooth\USB\TFcard mode(you need to insert a TF card or a USB disk); Long ...
The utility model discloses an X-waveband frequency comprehensive generator with low phase, wide noise, and agile frequency change. The frequency comprehensive generator comprises a 100MHz temperature-constant crystal oscillator, a power divider, a frequency multiplier, a P-waveband (800MHz-1000MHz)...