0.5‑470MHz Signal Generator High Frequency Signal Source for FM Radio Debugging Digital CTCSS Output DC8‑12V Item Type: Signal Generator Material: ABS Frequency: 0.5-470MHz Signal Strength: -70-132dBm Built in 800Hz Audio Modulation Power Supply: 8-12VDC Frequency Display: 7 Digits, eg. 439012.5KHZ displayed as 4390125 Operation: F1: Cycle Selection Set Item, Pointing to Selected Item, Respective Frequency, Signal Strength, Audio Modulation Frequency F2: Backspace key for input errors F3: On Off Signal Output F4: On Off Audio Signal Modulation Numeric Key: Enter the value of the selected item directly Up Down Key: Step to modify the value of the selected item Note: No input power, once the input exceeds 0dbm power will burn the signal source. Intercom Signal Source Description: Signal Source Mode: First Line Left Frequency: 0.5-470M, right output power: -70 to -132dBm Second Line Left Subtone: 50.0-280.0Hz, any analog sub tone and 105 groups of digital sub tone, right modulation tone system: 0-3K, 0k is off modulation tone Numeric Key: Enter directly for the cursor to point to the item Up Down Key: Step to adjust the cursor to the item value F1 Key: Cursor points to move F2 Key: Backspace key F3 Key: Function key, cycle switch function when the cursor points to output power, subtone, modulation tone, for example, when the cursor points to power output, this key function is cycle switch signal output. F4 Key: No Use Analog Subtone Setting: Input 4 digits of the subtone point directly, and add 0 in front of the less than 4 digits. For example, input 0, 8, 8, and 5 at 88.8Hz Now if you use the up down key adjustment will be 0.1Hz step adjustment, if you need e the standard 50 subtone adjustment to input 0, 0, 0, 0 and then use the up down key adjustment will start from the first standard subtone 67Hz adjustment. Digital Subtone Setting: Input 3 digit subtone code and then press F3 example 023 input 0, 2, 3 and then press F3 to set successfully, press F2 key to switch between the I and N of digital subtone, adjust the up and down key will add or subtract in 105 groups of digital subtones. Modulating tone and subtone values Input 0 is equivalent to off. Step Frequency Setting: When the cursor points to the frequency, long press F3 to save the current displayed frequency as step frequency. Fast Input Integer Frequency: For example, input 4, 3, F3 is 430.0000