Product
5W VHF 136-174mhz Waterproof Walkie Talkie FS-8200
Classify:
Single band walkie-talkie
Keywords:
5W VHF 136-174mhz Waterproof Walkie Talkie FS-8200
- Product description
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Analog walkie talkie is an analog walkie talkie designed using analog communication technology (also known as traditional walkie talkie), which modulates stored signals onto the transmission frequency of the walkie talkie.
The phase-locked loop and voltage controlled oscillator (VCO) generate the transmitted RF carrier signal, which is then buffered, amplified, excited, and amplified to produce the rated RF power. After passing through an antenna low-pass filter to suppress harmonic components, it is then transmitted through the antenna
The receiving part adopts a secondary frequency conversion superheterodyne method. The signal input from the antenna is amplified by the RF through a transceiver conversion circuit and a bandpass filter. After passing through the bandpass filter, it enters a mixing stage, where the amplified signal from the RF is mixed with the first local oscillator signal from the phase-locked loop frequency synthesizer circuit in the first mixer
Mix and generate the first intermediate frequency signal. The first intermediate frequency signal is further filtered by a crystal filter to eliminate the clutter signal from adjacent channels. The filtered first intermediate frequency signal enters the intermediate frequency processing chip and is mixed with the second local oscillator signal again to generate a second intermediate frequency signal. The second intermediate frequency signal is filtered out of useless stray signals through a ceramic filter, amplified and frequency discriminated to generate an audio signal. The audio signal is amplified, bandpass filtered, de emphasized, and other circuits before entering the volume control circuit and power amplifier for amplification, driving the speaker to obtain the information people need. The voice of the signaling processor is converted into an electrical signal of audio through a microphone, and the audio signal is directly modulated by a voltage controlled oscillator through an amplification circuit, a pre emphasis circuit, and a bandpass filter. The CTCSS/DTCSS signals generated by the CPU are amplified and adjusted before entering the voltage controlled oscillator for modulation. After receiving the low-frequency signal obtained through frequency discrimination, a portion of it is amplified and filtered by a sub audio bandpass filter for shaping. It then enters the CPU and is compared with the preset value to control the output of the audio amplifier and speaker. If it is the same as the preset value, turn on the speaker; if it is different, turn off the speaker.
Tag list
5W VHF 136-174mhz Waterproof Walkie Talkie FS-8200
Product packaging
standard export carton packing, standard export seaworthy parcel
Mode of delivery
According to the needs of customers, small quantity, express delivery; Large quantity, can be transported by sea
Custom Services
Committed to innovation, become the forefront of the radio industry, support OEM / ODM / OBM customization
Qualification Certification
M6P FCC
M6P CE
M2D FCC
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Add: Xiamei Industrial Zone, Quanzhou City, Fujian Province, China
Zip Code: 362302
Tel:+8618100521270
E-mail:qzhld@qzhld.com hld@hlddjj.com
Alibaba:https://henglidaradio.en.alibaba.com
