FM walkie-talkie comprehensive tester (RF signal source function, power meter function, frequency meter function, sub-tone measurement function)

1. Emission measurement
1. Frequency measurement 10MHz～900MHz resolution 1KHz or 0.1KHz
2. Power measurement 0.1W ~ 64W (the higher the power, please shorten the test time to avoid overheating)
3. Sub-audio measurement 50Hz～260Hz analog sub-tone and standard digital sub-tone

2. Receiving measurement
1. RF signal generator 1MHz--470MHz
2. Output level: -132dBm to -90dBm
3. Single tone modulation: 1KHz 2KHz 3KHz optional, output modulation degree: 3K
4. Sub-tone output: 50Hz---260Hz analog sub-tone and standard digital sub-tone, output amplitude: 0.5K

3. Repeater test
It is specially developed for debugging and measurement of U/V repeaters and FM walkie-talkies. The signal generator can work in duplex mode, that is, the machine under test is placed in the transmitting state without affecting the work of the generator, and it can be used for measurement in the repeating state of the repeater.
Fourth, the working voltage: 8-12V DC (direct current)
5. Working current: 200mA
6. There is no power supply, no test line, and no paper manual. For the specific operation method, see the introduction on the webpage.
Seven, net weight: 400 grams
8. Dimensions: 160*160*65mm (including protruding parts)

Walkie-talkie comprehensive test description
Source mode:
The left frequency of the first row (0.5-470M), the right output power (-90 -- -131dBm)
The left sub-audio of the second row (50.0-280.0Hz arbitrary analog sub-tone and 105 groups of digital sub-tone) Right modulation tone (1-3K) The lower right corner displays the input power
Numeric keys: direct input for the item pointed by the cursor
Up and down keys: step adjustment cursor points to the item value
F1 key: cursor point to move (long press to switch to frequency meter mode)
F2 key: Backspace key
F3 key: function key When the cursor points to the output power, sub-tone and modulation tone, it is the cycle switch function , for example: when the cursor points to the power output, the key function is the cycle switch signal output.
F4 key: not used
Analog sub-tone setting: directly input 4 digits of sub-audio point, if there are not enough 4 digits, fill in 0 in front of example 88.5Hz input 0, 8, 8, 5
Now if you use the up and down keys to adjust, it will be adjusted in steps of 0.1Hz. If you need to use standard 50 groups of subtones to adjust, you need to input 0, 0, 0, 0 and then use the up and down keys to adjust from the first standard subtone 67Hz. .
Digital sub-tone setting: enter the 3-digit sub-tone code and then press F3 Example 023 First enter 0, 2, 3 and then press F3 to set successfully, press the F2 key to switch between I and N of the digital sub-tone, adjust the up and down The keys will be added or subtracted in 105 groups of digital subtones.
Entering 0 for the modulation tone and subtone value is equivalent to off.
Step frequency setting: when the cursor points to the frequency, long press F3 to save the currently displayed frequency as the step frequency.

Frequency Meter Mode:
The left side of the first line is frequency , and the right side is the measurement mode AUTO/MANUA (in order to measure the sub-tone of the walkie-talkie or repeater at the same time, please select the AUTO mode)
The left side of the second row is sub-audio, the right side is the frequency resolution (1K/0.1K) (in order to test the frequency drift of the radio or repeater's transmission frequency, 0.1k can be selected to be more accurate) The lower right corner displays the input power
Numeric keys: not used
Up and down keys: not used
F1 key: long press to switch to source mode
F2 key: not used
F3 key: frequency meter resolution switch 1K/0.1K
F4 key: When the measurement mode is switched between AUTO/MANUA AUTO, it will automatically lock and detect the subtone after detecting the stable frequency and display the result until the signal disappears. After the signal disappears, continue to re-detect and wait for a new stable frequency. (You can detect the standard and non-standard analog sub-tones issued by the radio by yourself. If the digital sub-tones issued by the radio station can only detect the standard digital sub-tones, the non-standard digital sub-tones cannot be detected)
MANUA is a regular frequency meter to detect the update frequency in real time.

Note: At any time, as long as there is power input, the input power is displayed in the lower right corner.

After the calibration of the HP8921A radio comprehensive tester, we know that:
1. The frequency accuracy is within 50Hz of deviation
2. The output signal strength of V segment is comparable to that of HP8921A
3. The output signal strength of U-segment is 4dbm larger than HP8921A (in weak signal output, the actual value is -121dbm when the instrument displays -125dbm), and the strong signal output is the same as HP8921A (for example, when it is about -90dbm)
4. The audio modulation of the signal output is 3K
5. The sub-tone system in the signal output is 0.5K
6. The minimum power input required for the frequency meter function is 1mw (external antenna, 1w walkie-talkie can be measured by short-range transmission)
7. When the power meter is above 0.2w, it is equivalent to the HP8921A. When the power meter is less than 0.2w, the displayed value is about 20% larger than the actual value (it is estimated that it is due to rounding of 4 to 5).
8. When the test power exceeds 5w, please shorten the test time appropriately, and avoid high-power long-term testing, because the volume of the heat sink inside is limited to avoid overheating. If you really need high-power long-term testing, please increase the area of the heat sink and add a fan to force it. heat dissipation.
9. If you find that there is no signal output from the small comprehensive test, you can input it in the signal source mode: 001.0000 to use the spectrum to see whether there is a signal at the two frequencies of 498M and 499M. If there is no output, you can only send it back for repair.
10. If the frequency meter function displays half frequency or multiplier, the high probability of damage is the 8-pin model is 1507