{"product_id":"dw-400-digital-field-strength-instrument-built-in-speaker-can-demodulate-fm-radio-direction-finder-135-173mhz","title":"DW-400 digital field strength instrument built-in speaker can demodulate FM radio direction finder 135-173MHz","description":"\u003cdiv\u003e\u003cspan\u003e\u003cp\u003e\u003cspan\u003eDW-400 field strength meter (with built-in horn to demodulate FM mode)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Operating frequency: 135-173MHz\/200-280MHz\/400-520MHz\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Receiving sensitivity: - 126 dbm to+0 dbm (step 1 dbm continuously) (dynamic range up to 126 db)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. Working voltage: 3.6v (built-in lithium battery, which can be charged by the smart phone), can work continuously for 10 hours (the standby time when the speaker is not turned on will be shortened if the speaker is turned on\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. Current consumption: ≥ 150mA (power consumption will increase when the horn is turned on)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. Screen: color with backlight\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. A 400-470MHz antenna is attached\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. Size: 80 * 68 * 22mm (excluding antenna and projection)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. Charger is not included in the quotation, unless otherwise specified by the customer. (Charging with smartphone charger)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Special attention: Do not input a signal exceeding 0dbm (1mw RF power) to the device, or it will be burned (because the input signal is too strong, it is not within the warranty scope, but it can be charged for repair)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. If the power on code is garbled or the signal strength is not about - 120 dbm after power on, please shut down and restart. Of course, if the antenna is not connected, it may be an external strong signal, leading to high display value.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOperation method:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePress and hold the knob on the upper right corner until the screen displays \"Power on\", then release it, wait for power on, and then power on after 3 seconds. The frequency is displayed on the upper left corner of the screen, and the frequency adjustable range and battery power are displayed on the upper right corner, The field strength value of this frequency is displayed in the middle of the screen (and it will remain for about 1 second, and then it will return to the signal strength value that can be detected by the antenna. If the detected signal is a continuous signal, this value will remain unchanged). The speaker volume is displayed in the lower left corner of the screen, The signal strength required for opening the horn is displayed at the right bottom of the screen (that is, the signal strength required for opening the horn, similar to the horn switch, and the horn can only sound when the signal exceeds this setting). Rotate the knob at the upper right corner, and the white horizontal bar below the number on the screen moves back and forth below the frequency at the upper left corner and below the frequency adjustable range at the upper right corner. When the white horizontal bar is below the frequency, Press the button on the upper right corner once, the frequency will be highlighted, and then rotate the knob on the upper right corner to adjust the frequency. When the white bar is below MHz, rotate the knob on the upper right corner to adjust the frequency, and take MHz as the step adjustment. When the white bar is below Hz, rotate the knob on the upper right corner to adjust the frequency, and take 2.5KHz as the step adjustment unit, Press the button on the upper right corner to maintain this frequency. After power off, the last saved parameters will still be displayed after power on. Turn the knob at the upper right corner to the lower part of the adjustable frequency range, and then press the knob at the upper right corner to highlight the frequency band. Then turn the knob at the upper right corner to select within the adjustable frequency range of 135-175MHz, 200-280MHz and 400-520MHz. After selection, press the button at the upper right corner to save the frequency band. According to this operation method, you can set the volume of the horn and the silence depth of the horn. The lower right corner of the screen shows the real-time signal strength. As long as there is a signal change, this value will change. If there is no signal coming, the displayed value is the local static electromagnetic environment, which can be used to judge how the local electromagnetic environment is. If the electromagnetic environment is very good, it may display about - 127 dbm, if the electromagnetic environment is very bad, it may display - 105 dbm, which is often called the bottom noise.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDuring specific direction finding, in order to detect weak signals from a long distance, the noise at the bottom of the screen can be adjusted to - 127 dbm. At this time, the horn will often sound, and there will be a snow like pricking sound. When receiving the signal from the transmitter, it will beep. By rotating the direction of Yagi antenna, find the direction where the back noise is the least. If the beep is still not received at this time, It indicates that the location is far away from the transmitter or is in a blind area. Please find a high spot and continue to search until you find the beep, and then walk in this direction to search. When the location is closer to the transmitter, you can no longer judge the direction by listening to the sound. At this time, turn the Yagi antenna around, and the back noise of the receiver when receiving the signal from the transmitter is gone, that is, there is only a clear beep, At this time, you can adjust the - 127 dbm in the lower right corner to other values, such as - 110 dbm or - 10 dbm. The closer the value is to 0 dbm, the less the horn will sound (equivalent to the switch of the horn). At this time, you can judge the direction only by looking at the screen value. The closer the value is to 0 dbm, the closer the Yagi antenna is to the transmission source. When receiving a signal from the transmitter, the big character in the middle will remain for about 1 second, so that the user can see the value clearly. After 1 second, it will return to the value close to the lower right corner, that is, wait for the next detection. When the signal from the transmitter is received for the second time, it will remain for 1 second. The larger the displayed value (that is, the closer to 0 dbm) is, the closer the Yagi antenna is to the direction of the transmitter. Continue to rotate the Yagi antenna until the maximum value is found. Walking in this direction is the direction of the transmitter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter using the machine, long press the power switch button for 3 seconds, and then release the button when the word \"Shut Down\" appears on the screen to shut down the machine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e","brand":"mickcara","offers":[{"title":"000","offer_id":41178199621769,"sku":"00573-1","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0365\/2131\/2393\/products\/8376f18b1f69cfa81b8b531f348b6706.jpg?v=1678433218","url":"https:\/\/mickcara.com\/fr\/products\/dw-400-digital-field-strength-instrument-built-in-speaker-can-demodulate-fm-radio-direction-finder-135-173mhz","provider":"mickcara","version":"1.0","type":"link"}