Wireless Telephone Disk Ferrite Magnet

The early telephones belonged to the magnet type telephone set, which mainly consisted of a microphone, a receiver, a hand crank generator, an electric bell, and a dry battery. The power for communication is provided by the self-provided dry battery, and the ringing power is provided by the hand-cranked generator. Because there are two permanent magnets on this hand-cranked generator, it is called a magnet telephone. This type of telephone does not require an external power source.

Main features

1. The telephone uses a magnet-type microphone, which has the characteristics of long life, stable performance, low noise and high sensitivity.

2. The call loop of the phone adopts an auto-transformer circuit, which forms a side tone cancellation circuit, and the phone has a high efficiency of receiving calls; the voice is bright and clear;

3. The ringing and receiving loops are separated by a key switch, the polarized electric bell coils are connected in series, so the sensitivity is higher and the receiving distance is farther.

Product Specification

History Development Editor

In the era of artificial magnet telephone exchanges. User phones are equipped with hand-cranked generators. Use it to make AC calls first. After dropping a corresponding tag on the magnet-type switch, the operator talks with the user after seeing it, asks who the call is to be made, and then connects it. The magnet-type switch was later eliminated. It can only be seen in the telecommunications museum today, or occasionally in certain films, such as "Lenin in 1918".

After the magnet-type switch. A common-electric manual telephone exchange soon appeared. Its advantage is that the user-side phone no longer needs a hand-cranked generator and no other power supply. Its working current is provided by the exchange. The application of the common-electric switch lasts for a long time. Although it has been gradually replaced by later automatic switches, there are a considerable number of common electrical manual switches and automatic switches coexisting for a long time. For example, the artificial common electrical switch of Shanghai Jiangsu Road Telephone Bureau has a capacity of 6000 doors in the 20th century. The -40s were the largest artificial telephone exchange in Asia. It has been running until the 1970s before it was replaced by automatic switches. There are still a small number of long-distance manual communal exchanges in use in China. Dial 113 to complete long-distance communication. There are also some industrial and mining enterprises that use manual common electrical switches as internal switches.

Magnet type and common electric manual switches are both air separation, simulation and control.

Production Process

Early models

HCX-3

Product performance:

1. Match the light-duplex line. The impedance of the 800Hz phone is 800Ω ± 20%.

2. Two phones of the same model can communicate with each other. The communication distance can reach 21 kilometers under the condition of no more than 75db audio uniform noise.

3. It can work reliably in an environment with a temperature of -40 ℃ (using cold-resistant batteries)-+ 50 ℃, air pressure of 750 ± 30mmHg, and a temperature of + 40 ℃, with a relative humidity of 98%.

4. All the machine parts are fixed on the rack and integrated into the shell together with the mobile phone. The structure is solid, easy to carry and use.

5. Phone volume: 222X195X107 (cubic millimeter), weight is about 2.5Kg

65-1 type

Product performance of 65-1 portable magnetic telephone

1. The nominal value of the phone's impedance is 800 ohms, and the design uses light-weight covered wires. If you use ultra-light covered wires, the side tone is larger.

2. The working frequency band of the phone is 300-3400Hz.

3. Send reference attenuation: + 4.0— + 1.2N when using 3V battery voltage. The received reference attenuation is -0.8 ± 0.25N.

4. In a 75db noise environment, when using the same type of telephone to communicate with each other, the communication distance is 24 kilometers on the light-duty line.

5. Bell sensitivity: Under the environment noise level of 75db and the light-duty double-tracked line of 30km, two mutual shaking generators of the same type telephone can be heard at a distance of 2 meters.

6. Machine box: It is made of thermoplastic plastic and is durable.

7. Operating environment: Ambient temperature: -40 ℃ —— + 50 ℃. Relative humidity: up to + 40 ° C, relative humidity 95 + 3% Atmospheric pressure: 760-780 mm mercury column height range.

HAG-1 type handle

The product has functions of redialing and mute, which can be used for telephone communication of wired public network, and can also be used as a car phone. The product has reasonable structure, unique shape, flexible buttons, comfortable hand feeling, convenient operation, and has good anti-damage performance, moisture-proof and rain-proof performance.

Main Specifications:

Working temperature: -40 ℃ ～ 55 ℃

Shape reference size: 202mm × 80mm × 64mm

Simulation subscriber line length: 0Km 5Km

Sent loudness evaluation value: (dB) ≥5≤15

Received loudness evaluation value: (dB) ≥-7≤2

Side tone masking evaluation value: (dB) ≥6 ≥12

Low frequency group frequency: (Hz)

High frequency group frequency: (Hz)

The level of dual-tone multi-frequency signal (operating current is 35mA); low-frequency group level: (-9 ± 3) dBm; high-frequency group level: (-7 ± 3) dBm. The high frequency component level of each frequency combination is (2 ± 1) dB higher than the low frequency component level

Ringing characteristics:

Ringing sensitivity: ≤100 mVA

Vibration ring level: ≥70dB

HAG-2 mine

HAG-2 type mining magnet telephone

The product adopts electronic technology to optimize the design, and the technical indicators conform to the national standard of the telephone. It can be used for telephone communication in the wired public network, and has the functions of dual-tone dialing, redialing, key hang up, and call. Adopt low-halogen, flame-retardant material, anti-impact, moisture-proof; use membrane keys, with backlight indication when off-hook. The product has clear voice, beautiful and elegant appearance, and stable and reliable work.

Main Specifications:

Working temperature: -20 ℃ ～ 55 ℃

Shape reference size: 202mm × 80mm × 64mm

Weight: ≤330g

In dual-tone multi-frequency signals, the deviation of a single frequency is within ± 1.5% of the nominal frequency.

Low frequency group level: (-9 ± 3) dBm

High frequency group level: (-7 ± 3) dBm

HDX-1 portable

HDX-1 portable magnet telephone

This design can replace the old-fashioned magnet phone, suitable for wired communication, the communication distance is 21km. It has the characteristics of waterproof, shockproof, clear voice, stable and reliable work, and good compatibility.

Main Specifications:

Working temperature: -40 ℃ ～ 50 ℃

Shape reference size: 50mm × 110mm × 240mm

Weight: ≤1.55kg

Power supply voltage: 4.5V (three dry batteries)

Ringing frequency: 16Hz ～ 30Hz

Ringing level: ≥70dB (A)

Amplitude: ≥55V (3kΩ load)

Ringing duration: 1s ～ 2s

Transmission characteristics: Simulated subscriber line length 5Km

Transmitted loudness evaluation value (dB) ≥5≤18

Received loudness evaluation value (dB) ≥-13≤2

Side tone masking evaluation value (dB) ≥0≥2

Magnetic Feature:

1) Material: SrO or BaO and Fe2O3 by ceramic processing technology;

2) Grade:Y10T,Y20,Y25,Y30,Y30BH,Y35,C1,C5,C8,C8B,C9,C10,C11 and so on.

3) Shape: ring,block,disc,bar and so on;

4) Size: according to customers' request;

5) According to customer's request .We can supply different size magnetic hook.

6) Good quality with competitive price and best delivery date.

7)Application:sensors,motors, rotors, wind turbines,wind generators, loudspeakers,magnetic holder, filters automobiles and so on.

8) Certificate:TS16949, SGS test report

Why choose us:

1.Personal and friendly service.

2.More than 10 years experiences factory in China.

3.Our products are high quality, competitive price, good service after sales.

4.Our designs follow the international fashion trend,and popular around the word.

5.We can do the styles according to the clients’requirements.

6.OEM. ODM order is welcome , also customer's logo is welcome .

7.Small orders and sample orders are accepted.

8.Safe for children, eco-friendly, can supply SGS testing

9. All kinds of design, shape, logo etc are acceptable. More details according to customer's requirements.

Product packaging

Since the magnetism of magnets can affect the navigation of airplanes and ships, transportation companies have special

requirements on the packaging of magnets.

We are a company with many years of experience in exporting magnets. experienced in exporting magnets. We have professional packaging, which can help you to get the magnets smoothly.

Products Shipment

Save money shipment way .

Cooperate with FedEx, DHL, UPS and TNT over 6 years , confidence to get the minimum your shipping cost.

• Experienced shipping forwarder for Ocean and Air shipments. When the Net weight of the magnet is over 200Kg, by sea is the best way.

FAQ

Q: Are you trading company or manufacturer ?

We are factory. We have export magnet experience for more than 10 years.

Q: What are your main product?

we are professional make magnet.

Q: How long is your delivery time?

Generally it is 3-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples ? is it free or extra ?

Yes, we could offer the sample for free charge if the samples is in stock, but need pay the cost of freight.

Q: Do you have any testing report or certification?

Yes, we have SGS factory checking tesing report, ISO9001:2008 quality system certification, and producting pass ROHS, REACH testing.

http://www.topmaght.com/