Where is the use method of DTV ds2 100b generally debugged?

You can use it by rotating the black button in the upper right corner, as shown below:

DW-400 field strength meter (built-in speaker demodulation FM mode)

1, working frequency:135-173mhz/200-280mhz/400-520mhz.

2. Receiving sensitivity:-126dbm to +0dbm (continuous stepping 1dbm) (dynamic range up to 126db).

3. Working voltage: 3.6v (built-in lithium battery, which can be charged by mobile phone charger) can work continuously 10 hour (standby time will be shortened when the horn is not turned on).

4. Current consumption: 150mA or more (power consumption will increase when the horn is turned on).

5, screen: color with backlight

Extended data:

In specific direction finding, in order to detect weak signals in a long distance, the static noise directly below the screen can be adjusted to-127dbm. At this time, the horn will keep ringing and there will be a snow-like tingling. When receiving the transmitting signal, it will beep. Turn the direction of Yagi antenna to find the direction with the least background noise, that is, the direction where the transmitter is located.

If you still can't receive the buzzer at this time, it means that the location is far away from the transmitter or in a blind area. Please find a high place to keep looking until you find the beep, and then walk in this direction and you will find it. As you get closer and closer to the emitter, you can't judge the direction just by listening to the sound.

At this time, when the Yagi antenna is rotated once, there will be no background noise when the receiver receives the transmitted signal, that is, there will be only a clear beep.

At this time,-127dbm in the lower right corner can be adjusted to other values, such as-1 10dbm or-10dbm. The closer the value is to 0dbm, the less noise the speaker makes (equivalent to the switch of the speaker). At this time, you can judge the direction only by looking at the screen value. The closer the value is to 0dbm, the closer the Yagi antenna is to the emission source.

Baidu Encyclopedia-Digital TV Field Strength Instrument