What Is a Frequency Table?

A frequency meter is a mechanical indicator meter that measures frequency. There are many types of frequency meters, including electric systems, ferromagnetic electric systems, and inverter-type frequency meters that are rectifiers. Most of the installed frequency meters used to monitor the frequency at the production site use ferromagnetic electric meter measuring mechanisms.

Frequency table

Frequency meter refers to the measurement of frequency

The measurement mechanism and circuit of the ferromagnetic motor frequency meter are shown in the figure. A series resonant circuit composed of a fixed coil with an iron core, an inductor L , and a capacitor C is usually adjusted to resonate at the middle frequency (for example, 50 Hz) of the scale. The movable part consists of two coils, where the moving coil 1 is connected in series with the capacitor C 1 and connected in parallel with the resonance circuit. When the power is turned on, I , I 1 are the currents in the fixed coil and the moving coil 1, is the angle between the two current phasors, and K is the coefficient. The moving coil 2 forms a closed loop with the resistor R 2 and the inductor L 2. When the pointer of the movable part deviates from the angle of the middle position of the scale, the moving coil 2 will receive a resistance moment that is proportional to the deflection angle and returns the pointer to the middle position. When the measured frequency is equal to the middle frequency of the scale, the resonance circuit resonates. At this time, the angle = 90 ° between the current in the fixed coil and the current phasor in the moving coil 1, so the rotation torque M = 0. Then, under the action of the moment of the moving coil 2, the movable part makes the pointer point on the scale of the middle frequency (for example, 50 Hz) of the scale. When the measured frequency deviates from the intermediate frequency, the resonance condition is destroyed, the rotating torque is no longer zero, and the movable part is deflected until the rotating torque and the resisting torque are balanced, the movable part will stop at the new corresponding to the measured frequency. Location. By changing the parameters of the series resonance circuit, different frequency ranges can be obtained.

The frequency meter is used to measure the frequency of the power frequency grid. For a frequency of 50 Hz, the measurement error of the frequency meter is less than 0.1 Hz.

Many countries in the world make use of

Period is the inverse of frequency, since electrons

1 Measurement range: 30.00 99.99Hz (meters outside this range can be customized according to special specifications)

2 Accuracy: ± 0.1Hz

3 Display resolution: 0.01Hz

4 Sampling rate: about 3 times / s

5 Input signal type: Alternating voltage or unipolar pulse

6 Input signal amplitude: AC10V 500V

7 Input loop power consumption: <1VA

8 auxiliary power consumption: <3VA

10 Overflow indication: display characters "HHHH" or "LLLL"

11 Prompt message when no signal is input: display character "----"

12 Alarm output: Alarm output: Upper and lower limit alarms are the same relay output, and the contact capacity is AC250V / 2A, DC30V / 2A.

13 Transmission output: can be freely set to DC0 10mA, 0 20mA or 4 20mA, accuracy ± 0.5% FS, and between signal input and auxiliary power

According to the external dimensions of the meter, select the corresponding opening size in the table above. Make a hole in the mounting screen. After the meter is inserted into the mounting hole, place the two clamps into the clamping grooves of the meter housing and push firmly Just fine.

1 Before powering on, please confirm the power of the instrument, whether the input signal is within the use range, and whether the wiring is correct and reliable.

2 The instrument must be warmed up for 15 minutes before accuracy measurement and calibration can be performed.

3 The instrument should not be struck, bumped, and severely vibrated, and the use environment should meet the technical requirements

List of frequently used communication frequencies in Beijing area 1. Association relay --- 439.750 difference 5, 88.5 mute

2. Association Relay Straight-439.750

3. Association Relay Uplink-434.750

4. Association straight hair-438.500

5.West Ham United-438.550

6. Love card frequency 1-438.975

7. Love card frequency 2-438.375

8.CQCAR frequency --- 438.800

9. Frequently sent points-436.100

10. Fun car frequency-438.125

11. Shortcut frequency-435.050

12. Joy group frequency-438.425

13. Seve Sai Tigers-438.200

14. Xiali Club-438.250

15.East HAM Frequency-438.350

16. Sai League frequency-437500

17. Nancheng straight hair-436600

18. Direct hair in Tongzhou District-438.700

19. Airport area relay-439.300 down 5.05

20. Miyun Relay-439.625 difference 5

21. Fukang Che Youhui-438.365

22. Straight from Wangjing area-439.200 This point at the airport has long since disappeared. This point at Wangjing turned out to be a direct from the airport!

23, Daxing Community Relay-438.725 difference 5

24, the world's riders-433550

25. Straight hair in Miyun area-439.650

26.Hifford Club-438.850

27. Bora Che Youhui-438150

28. Traveling the World --- 438300

Jinzhou, Liaoning Up: 434.5 Down: 439.5 Subtones: None

Dalian, Shenyang Ibid.

Wuhan's relay was changed to 144.700MHZ uplink and 145.775MHZ downlink

Nanjing Nanjing Relay 431.875Mhz 436.875Mhz None

Shanghai Shanghai South District Relay 434.625Mhz 439.625Mhz None

Shanghai Shanghai North District Relay 434.650Mhz 439.650

Frequency table

Mhz None

Shanghai ham waiting frequency 436.000Mhz 436.000Mhz None

Shanghai PA Association waiting frequency 433.000Mhz 433.000Mhz None

The waiting frequency of Shanghai pchome riders is 433.225Mhz 433.225Mhz None

Suzhou Suzhou Relay 433.025Mhz 438.025Mhz None

Suzhou waiting frequency 433.000Mhz 433.000Mhz None

Kunshan Kunshan Relay 433.150Mhz 438.150Mhz None

Jiaxing Jiaxing Tongxiang Relay 434.450Mhz 439.450Mhz 107.2hz

Hangzhou waiting frequency 434.800Mhz 434.800Mhz None

Shaoxing Shaoxing Relay 439.675Mhz 431.675Mhz None

Pinghu Pinghu Relay 430.275Mhz 435.275Mhz

Changzhou Changzhou Relay 439.375Mhz 434.375Mhz None

Zhangjiagang Zhangjiagang Relay 437.075Mhz 432.075Mhz None

List of frequently used communication frequencies in Beijing

Frequency table

1. Association relay --- 439.750 difference 5, 88.5 mute

2. Association Relay Straight-439.750

3. Association Relay Uplink-434.750

4. Association straight hair-438.500

5.West Ham United-438.550

6. Love card frequency 1-438.975

7. Love card frequency 2-438.375

8.CQCAR frequency --- 438.800

9. Frequently sent points-436.100

10. Fun car frequency-438.125

11. Shortcut frequency-435.050

12. Joy group frequency-438.425

13. Seve Sai Tigers-438.200

14. Xiali Club-438.250

15.East HAM Frequency-438.350

16. Sai League frequency-437500

17. Nancheng straight hair-436600

18. Direct hair in Tongzhou District-438.700

19. Airport area relay-439.300 down 5.05

20. Miyun Relay-439.625 difference 5

21. Fukang Che Youhui-438.365

22. Straight from Wangjing area-439.200 This point at the airport has long since disappeared. This point at Wangjing was originally a direct from the airport!

23, Daxing Community Relay-438.725 difference 5

24, the world's riders-433550

25. Straight hair in Miyun area-439.650

26.Hifford Club-438.850

27. Bora Che Youhui-438150

28. Traveling the World --- 438300

Jinzhou, Liaoning Up: 434.5 Down: 439.5 Subtones: None

Dalian, Shenyang Ibid.

Wuhan's relay was changed to 144.700MHZ uplink and 145.775MHZ downlink

Nanjing Nanjing Relay 431.875Mhz 436.875Mhz None

Shanghai Shanghai South District Relay 434.625Mhz 439.625Mhz None

Shanghai Shanghai North District Relay 434.650Mhz 439.650

Frequency table

Mhz None

Shanghai ham waiting frequency 436.000Mhz 436.000Mhz None

Shanghai PA Association waiting frequency 433.000Mhz 433.000Mhz None

The waiting frequency of Shanghai pchome riders is 433.225Mhz 433.225Mhz None

Suzhou Suzhou Relay 433.025Mhz 438.025Mhz None

Suzhou waiting frequency 433.000Mhz 433.000Mhz None

Kunshan Kunshan Relay 433.150Mhz 438.150Mhz None

Jiaxing Jiaxing Tongxiang Relay 434.450Mhz 439.450Mhz 107.2hz

Hangzhou waiting frequency 434.800Mhz 434.800Mhz None

Shaoxing Shaoxing Relay 439.675Mhz 431.675Mhz None

Pinghu Pinghu Relay 430.275Mhz 435.275Mhz

Changzhou Changzhou Relay 439.375Mhz 434.375Mhz None

Zhangjiagang Zhangjiagang Relay 437.075Mhz 432.075Mhz None

Hangzhou Hangzhou Fan Club Channel 433.800Mhz 433.800Mhz

Nanjing 0.7m relay 431.600Mhz 436.600Mhz without 24 hours BD4RBN

Beijing 0.7m relay 434.750Mhz 439.750Mhz without 24 hours

Guangzhou 0.7m relay 434.470Mhz 439.470Mhz 88.5Hz 24 hours

Kowloon Tate's Cairn Hong Kong 2m relay 145.050Mhz 145.650Mhz 110.9Hz 24 hours VR2KP

Hong Kong Island Victoria Peak Hong Kong 2m relay 145.150Mhz 145.750Mhz 110.9Hz 24 hours VR2HKA

Hong Kong Island Victoria Peak Hong Kong 2m relay 144.975Mhz 145.575Mhz 110.9Hz 24 hours VR2MA

Tai Mo Shan Hong Kong 2m relay 145.700Mhz 145.100Mhz 110.9Hz 24 hours

New Territories Yuen Long Hong Kong 2m relay 145.775Mhz 145.175Mhz 110.9Hz 24 hours VR2UTM

Shanghai Southern District 434.625Mhz 439.625Mhz Without 24 hours

Shenzhen Futian 0.7m relay 434.360Mhz 439.360Mhz 88.5Hz 24 hours BA6AP

Hefei 0.7m relay 434.750Mhz 439.750Mhz without 24 hours BD6AO

Shaoxing Relay 439.650Mhz 431.650Mhz None

Hunan Zhuzhou Relay 430.875Mhz 439.875Mhz without 24 hours BA7AT

Xi'an waiting frequency 145.000Mhz 145.150Mhz without 24 hours

Dongguan 0.7m relay 434.100Mhz 439.100Mhz 88.5Hz 24 hours

Shunde 0.7m relay 434.600Mhz 439.600Mhz 88.5Hz 24 hours

Foshan 0.7m relay 434.680Mhz 439.680Mhz 88.5Hz 24 hours

Kaiping 0.7m relay 434.800Mhz 439.800Mhz 88.5Hz 24 hours

Jiangmen 0.7m relay 434.900Mhz 439.900Mhz without 24 hours

Zhuhai 0.7m relay 434.730Mhz 439.730Mhz 88.5Hz 24 hours

Luoyang 0.7m relay 434.025Mhz 439.025Mhz without 24 hours

Chongqing 0.7m relay 434.850Mhz 439.850Mhz without 24 hours

Leshan 2m waiting frequency 144.800Mhz 144.800Mhz without 24 hours

Wuhan 2m relay 144.400Mhz 145.200Mhz without 24 hours

Macau 2m relay 144.720Mhz 144.120Mhz 127.3Hz 24 hours

Macau 2m relay 2 144.850Mhz 145.450Mhz 210.7Hz 24 hours

Jinan 2m relay 145.470Mhz 145.870Mhz 88.5Hz 24 hours

Jinan 0.7m relay 433.550Mhz 438.550Mhz 88.5Hz 24 hours

Fuzhou 2m relay 144.100Mhz 147.900Mhz without 24 hours

Suzhou 2m waiting frequency 144.700Mhz 144.700Mhz without 24 hours

Suzhou 0.7m relay 433.025Mhz 438.025Mhz without 24 hours

Zhangzhou 2m relay 144.015Mhz 147.970Mhz without 24 hours

Wenshan 2m relay 147.950Mhz 145.100Mhz without 24 hours

Kunming 2m waiting frequency 145.150Mhz 145.150Mhz without 24 hours

Liuzhou 2m relay 144.060Mhz 147.980Mhz without 24 hours

Nanchang 2m waiting frequency 144.875Mhz 144.875Mhz without 24 hours

Shanghai 2m waiting frequency 144.900Mhz 144.900Mhz without 24 hours

Dalian 2m waiting frequency 145.050Mhz 145.050Mhz without 24 hours

Fushun 2m waiting frequency 144.900Mhz 144.900Mhz without 24 hours

Shandong Zibo 0.7m relay 434.600Mhz 439.600Mhz without 24 hours BD4OG

Shandong Xintai 0.7m relay 434.650Mhz 439.650Mhz without 24 hours

Shanghai 0.7m waiting frequency 436.000Mhz 436.000Mhz without 24 hours

Shenyang 2m waiting frequency 145.050Mhz 145.050Mhz without 24 hours

Baoji 2m waiting frequency 145.150Mhz 145.150Mhz without 24 hours

Nanning 2m relay 144.100Mhz 147.975Mhz without 24-hour BG7UG

Nanning 2m relay 2 144.475Mhz 147.975Mhz without 24 hours

Nanning 0.7m relay 455.775Mhz 465.775Mhz without 24 hours BG7UG

Dongguan Tangxia 0.7m waiting frequency 439.100Mhz 439.100Mhz without 24 hours

Chaozhou 0.7m relay 431.475Mhz 439.475Mhz without 24 hours

Hong Kong 0.7m relay 430.250MHz 435.250MHz 110.9 24 hours

Shunde 0.7m relay 2 434.700MHz 439.700MHz 88.5Hz 24 hours BA7KW

Yangzhou 2m relay 144.100Mhz 145.900Mhz None closed

Qingdao Qingdao Frequently used frequency 438.550Mhz 438.550Mhz No 24 hours

Guangzhou backup relay 434.450Mhz 439.450Mhz without 24 hours

Shenzhen Nanshan 0.7m relay 430.360Mhz 439.360Mhz 88.5Hz 24 hours

Kunshan 0.7m relay 433.075Mhz 438.075Mhz without 24 hours

Kunshan 2m relay 147.900Mhz 144.050Mhz without 24 hours

Zhengzhou 0.7m relay 434.750Mhz 439.750Mhz without 24 hours

Zhengzhou 0.7m relay 2 459.850Mhz 451.850Mhz without 24 hours

Quyang 0.7m relay 434.650Mhz 439.650Mhz without 24 hours

Luoyang 0.7m relay 430.000Mhz 439.025Mhz without 24 hours

Huaiyin 2m relay 144.870Mhz 145.470Mhz without 24 hours

Danyang 0.7m relay 433.075Mhz 438.075Mhz without 24 hours

Danyang 2m relay 144.800Mhz 144.800Mhz without 24 hours

Guilin 0.7m relay 434.630Mhz 439.625Mhz without 24 hours

Xuzhou 2m relay 144.840Mhz 145.470Mhz without 24 hours

Jiaxing Tongxiang 0.7m relay 434.390Mhz 439.390Mhz without 24 hours

Pinghu Relay 430.275Mhz 435.275Mhz Without 24 hours

Hohhot 0.7m relay 431.400 438.900

Datong 0.7m relay 431.125 439.625

Chengdu 0.7m experimental relay 434.700Mhz 439.700Mhz without 24 hours

Chengdu 2m waiting frequency 144.450Mhz 144.450Mhz without 24 hours

Chengdu 0.7m waiting frequency 438.000Mhz 438.000Mhz without 24 hours

Shijiazhuang 0.7m relay 430.150Mhz 439.950Mhz without 24 hours

Shijiazhuang 0.7m Relay 2 434.650Mhz 439.650Mhz Without 24 hours

Weihai 2m waiting frequency 144.790Mhz 144.790Mhz without 24 hours

Yuyao Mute 107.2 434.550Mhz 439.550Mhz Without 24 hours

Shaoxing 431.675Mhz 439.675Mhz Without 24 hours

Zhangjiagang 432.075Mhz 437.075Mhz Without 24 hours

Hangzhou Zhejiang University Campus Relay 431.600Mhz 439.600Mhz No 24 hours

Hangzhou Lafengyi Che Che Youhui will call directly at 434.800Mhz None

Hangzhou Ham Connected Direct Frequency 435.000Mhz None