Radio Direction Finder Digital Instrument with Automatic Adjustment of Falconry Field Horn FM Radio Detector

DW-400 type field intensity meter (with a built-in speaker demodulating FM mode)

Specifications:
 

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

2. receiving sensitivity: -126dbm to +0dbm (step 1dbm continuous) (the dynamic range is up to 126dB)

3. working voltage: 3.6V (built-in lithium battery, charging can be charged by mobile phone intelligent machine) can work continuously for 10 hours, (not at all speakers of standby time, if the opening horn will shorten this time)

4. consumption of current: greater than or equal to 150mA (the power consumption will increase when the horn is opened)

5. screen: color backlight

6. with a 400-470MHz antenna

7. size: 80*68*22mm (excluding antenna and protruding part)

8.Charges are not included in the quote

9.,Special attention: Do not input signals exceeding 0dbm (1mw RF power) to the device, otherwise it will burn.

10., if the boot messy code or the signal strength after boot is not about -120dbm, please turn off the machine and restart the machine. Of course, if the antenna is not connected, if the antenna is connected, it may be a strong external signal, resulting in high display value.

Operation method:

 

Press the knob on the upper right corner of the screen, until the "boot" and then let go, wait for 3 seconds after the boot, the boot, the upper left corner of the screen display shows the frequency, the upper right corner of the adjustable frequency range, the battery, the middle of the screen shows the strength of the values of the frequency (and maintained for about 1 seconds, the numerical signal strength 1 after the second return to the antenna can be detected if the detected signal is a continuous signal, this value remains unchanged) the lower left corner of the screen shows the speaker volume, just below the screen display of signal strength to open the horn (which is open to the horn signal strength, similar to the horn switch, only the signal exceeds the set when the horn can sound) knob in the upper right corner, white bar on the screen below the digital back and forth in the upper left corner of the bottom right corner of the frequency and adjustable frequency range To move back, when the white bar in the frequency below, click the button in the upper right corner, the frequency is highlighted, and the upper right corner of the knob, can adjust the frequency, when the white bar below the MHz, the upper right corner of the knob can adjust the frequency, and to MHz is the step adjustment, when the white barAt the bottom of Hz, the rotary knob on the upper right corner can adjust this frequency, and 2.5KHz is used as stepping unit adjustment. The adjustment is completed. Press the button on the upper right corner to maintain this frequency. After shutdown, the boot is still showing the last saved parameters. Below the knob on the top right corner of the adjustable frequency range, and then press the knob at the upper right corner, the band highlighted, and then rotating the knob in the upper right corner, in the 135-175MHz and 200-280MHz and 400-520MHz three frequency adjustable frequency range selection, selection is complete, click on the upper right corner of the this band can save button. According to the operation method of squelch depth can set the sound volume of the horn and horn. The lower right corner of the display screen is real-time signal strength, as long as the signal changes in this value will change, if there is no signal, the displayed value is the local static electromagnetic environment, which can judge how the local electromagnetic environment, if the electromagnetic environment is very good may show about -127dbm, if the electromagnetic environment is very poor may show -105dbm, it is often said that the background noise.

 

The specific direction, in order to weak signal can detect the distance, can be directly below the screen to squelch -127dbm at the speakers are usually rang, there will be snow pattern thorn, when receiving the emission signal when the hair will beep sound, by rotating the Yagi antenna direction to find the direction of the minimum noise emission is head back in the direction, if you still do not receive beep, indicating the location of emitter distance or distance in the blind, please find a high place, continue to search until you find the beep, and then walked toward this direction to find, when the distance between the transmitter head getting closer by listening to the sound has not this will determine the direction of the Yagi antenna to a circle, the receiver receives back noise when the signal is transmitted to the hair are not, there is only a clear tone, At the lower right corner of the -127dbm can be transferred to other -110dbm or -10dbm numerical value such as the closer the 0dbm horn will not make a sound (the equivalent of the horn switch), the only look at the screen to determine the direction of the numerical value, more close to the 0dbm Yagi antenna is close to the emission source toward. The middle big character will be kept for about a second when receiving a signal from the launch. Let the user see this value and return to the value near the lower right corner after one second, that is, wait for the next detection. When the signal is emitted from the second time, it will still hold for 1 seconds, and the bigger the value is, the closer it is to 0dbm, through two times of numerical change.A Yagi refers to the direction where the head is closer to the emission direction, continue to rotate until you find the Yagi antenna shows a maximum value when moving in this direction in the past is in the direction of the launch of the first.

Package Includes:

1 x Field Strength Meter

Details Pictures: