High frequency signal source, radio frequency signal source (0.5-470MHz)

 1. specially for FM interphone debugging

 2. frequency 0.5MHz-470MHz

 3. the output signal strength is -70 to -132dBm (other values are invalid).

 4. built in 800Hz audio modulation (FM mode modulation).

 5. using 8-12V DC power supply

 6. frequency 7 digit example: 439.0125MHz display 4390125 if 439.125MHz display 4391250

 7. (prohibit the input power, once the input exceeds 0dbm power will burn the signal source).

 8. random no power supply, no test line, no paper instructions, specific operation methods see webpage introduction.

 The operation method is as follows:

 The F1: cycle chooses to set the item "to" the selected item, the frequency, the signal strength, and the frequency of the audio modulation respectively.

 Backspace key for F2: input error

 F3: turn off, open signal output

 F4: turn off, open audio signal modulation

 Numeric key: directly input the number of selected items

 Up and down key: step to modify the value of the selection project

 Be careful:

 It is forbidden to input power. Once input power exceeds 0dbm, the signal source will be burned. The damage caused by input power is not guaranteed.

 The signal source description of the interphone

 Signal source mode:

 First line left frequency (0.5-470M), right output power (-90 ---131dBm)

 The second line is on the right subaudible (50.0-280.0Hz analog analog subtone and 105 digit subtone) on the right side of the modulation tone (1-3K).

 Digital keys: direct input for the cursor to the project

 Up and down key: step adjust the cursor to point to the value of the project

 F1 key: the cursor points to the movement

 F2 key: backspace key

 F3 key: function keys cursor output power, subsonic and modulation sound cycle switch function, example: cursor power output of the key function for the cycle switch signal output.

 F4 key: Unused

 Analog sub tone settings : direct input of 4 digit subaudible points, not enough 4 bit front complement "0" example 88.8Hz input 0, 8, 8, 5

 Now, if you use up and down key adjustment will be 0.1Hz step adjustment, if you need to adjust the standard 50 sets of subtone to input 0, 0, 0, 0 then use the upper and lower key adjustment will start from the first standard subtone 67Hz.

 Digital subtone settings:  input 3 bit digital subtone code and then press F3 case 023 to enter 0, 2, 3 and then press F3 to set up successfully. According to F2 key, you can switch between I and N in the digital subtone, and the adjusted up and down key will be added and reduced in the 105 group of digital subsounds.

 Modulation and subtone input 0 is equivalent to closing.

 Step frequency setting : when the cursor is pointing to the frequency, it will be saved as stepping frequency according to the current display frequency of F3.

 Fast input integer frequency : example input 4, 3, F3 is 430.

 Special attention:

 This signal source is mainly used to test the sensitivity of analog walkie talkies. It belongs to narrowband FM mode and is not suitable for testing the receiver sensitivity of radios. The maximum output is - 70 dbm, which belongs to the UV level. Therefore, the signal cannot be detected with the mv level oscilloscope and frequency meter.