1‑470MHz Signal Generator FM Receiving Transmitting Comprehensive Tester Frequency Power Measurement 8‑12VDC Item Type: FM Tester Working Voltage: 8-12V DC Working Current: 200mA Transmitting Measurement: 1. Frequency Measurement: 10M-900M, Resolution 1K or 0.1K 2. Power Measurement: 0.1W-64W 3. Subaudio Measurement: 50Hz-260Hz, analog subtone and standard digital subtone Receiving Measurement: 1. Signal Generator Frequency: 1MHz-470MHz 2. Output Level: -132dBm to -90dBm 3. Single Tone Modulation: 1KHz, 2KHz, 3KHz optional, output modulation depth: 3K 4. Subtone Output: 50Hz-260Hz analog subtone and standard digital subtone, output amplitude: 0.5K Signal Source Mode: First Line Left: Frequency (0.5-470M), Right: Output Power (-90-131dBm) Second Line Left: Subaudio (50.0-280.0Hz Any Analog Subtone and 105 Digital Subtone), Right: Modulation Tone (1-3K), Lower Right Corner Display Input Power Numeric Key: For direct input of cursor indicated item Up and Down Key: Step adjustment of cursor indicated item value F1 Key: Cursor Pointing Movement (long press to switch to frequency counter mode) F2 Key: Backspace Key F3 Key: Function key, when the cursor points to output power, subaudio, and modulation tone, it is a cyclic switching function, e.g., when the cursor points to power output, this key function is to cyclically switch the signal output. F4 Key: Not Use Analog Subtone Setting: Directly enter subaudio point with 4 digits, if less than 4 digits, fill in 0 in front, e.g., 88.5Hz input 0, 8, 8, 5; now if you use up and down keys to adjust, it will be adjusted in steps of 0.1Hz; if you need to adjust in 50 standard subtones, you need to enter 0, 0, 0, 0, and then use up and down keys to adjust from the first standard subtone 67Hz. Digital Subtone Setting: Enter 3 digit digital subtone code and then press F3, e.g., 023, enter 0, 2, 3, and then press F3 to set successfully; press F2 key to switch between I and N in digital subtone, adjust up and down keys in 105 sets of digital subton 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. Frequency meter mode: First Line: Left: frequency, right: Measurement mode AUTO/ MANUA (In order to simultaneously measure the transmissing subtone of the intercom or repeater, please select AUTO mode) second line: left: subaudio, right: frequency resolution (1K/0.1K) (in order to test the frequency of the transmissing frequency of the intercom or repeater can choose 0.1k will be more accurate), the input power is displayed in the lower right corner Digit Key: Not Use Up or Down: Not Use F1 Key: Press and hold to switch to signal source mode F2 Key: Not Use F3 Key: Frequency meter resolution switch 1K/0.1K F4 Key: When the measurement mode is switched between AUTO or MANUA, at AUTO, the stable frequency is detected and automatically locked, the subtone is detected and the result is displayed until the signal disappears. After the signal disappears, the detection continues to wait for the new stable frequency. (You can detect the standard and non standard analog subtones emitted by the radio by yourself. If the radio emits digital subtones, only standard digital subtones can be detected, and non standard digital subtones cannot be detected.). At MANUA, detects the update frequency in real time for the conventional frequency meter. Note: Whenever there is a power input, the input power is displayed in the lower right corner. After Calibration of HP8921A Radio Comprehensive Tester: 1. Frequency accuracy is within 50Hz deviation 2. The output signal strength of v band is equivalent to HP8921A 3. The output signal strength of the U band is 4dbm larger than HP8921A (in the weak signal output, the actual value is -121dbm when the instrument displays -125dbm), and the strong signal output is the same as HP8921A (such as about -90dbm). 4. The sound modulation system of signal output is 3K 5. The subtone system in the signal output is 0.5K 6. The minimum power input required for frequency meter function is 1mw (external antenna, 1w intercom can be measured by close range transmissing) 7. The power meter is equivalent to HP8921A above 0.2w, and the display value is about 20% larger than the actual value when it is less than 0.2w (estimated to be the reason for rounding off 4). 8. When the test power exceeds 5w, please shorten the test time appropriately to avoid high power long term test, because the heat sink inside is limited in volume, avoid overheating, if you really need high power long term test, please increase the heat sink area and add a fan to force heat dissipation. 9. If It Is Found That The Small Comprehensive Test Has no signal output, you can input: 001.0000 in the signal source mode to see whether there is a signal at 498M and 499M two frequencies with the spectrum, if there is no output, it can only be sent back for