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A vhf transceiver test circuit

A technology for testing circuits and transceivers, applied in the field of testing, can solve problems such as damage to VHF transceivers, uneven heat dissipation, damage to transistors, etc., and achieve the effect of reducing power and protecting from damage

Inactive Publication Date: 2016-01-27
JR TECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the VHF transceiver is transmitting, since the modulation degree must reach at least 70%, and the heating triode used for modulation on the VHF transceiver is very easy to damage the triode on the VHF transceiver due to uneven heat dissipation or excessive heat, which will lead to VHF failure. Transceiver damage

Method used

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  • A vhf transceiver test circuit
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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0016] refer to figure 1 and figure 2 As shown, the present invention provides a VHF transceiver test circuit for testing the VHF transceiver 10. The test circuit includes a power meter 20 connected to the VHF transceiver 10 through a shielded cable 50, and is arranged on the shielded cable 50. The modulation degree detection circuit on the shielded cable 50, the "T" connector 40, and the RF attenuator 30 connected to the "T" connector 40; the modulation degree detection circuit includes a single To the current limiting circuit 100, the filter 90, the grounding protection circuit 80, the current limiter 60, the inductor L1 and the audio detection interface 70 arranged at one end of the inductor L1.

[0017] see figure 1 As shown, the unidirectional current limiting c...

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Abstract

The invention relates to the technical field of testing and discloses a test circuit for a VHF transceiver. The test circuit is used for testing the VHF transceiver and comprises a power meter connected with the VHF transceiver through a shielded cable line, a modulation degree detecting circuit arranged on the shielded cable line, a T-shaped connector arranged on the shielded cable line and an RF attenuator connected with the T-shaped connector. The modulation degree detecting circuit comprises a single-way current foldback circuit, a filter, a grounding protective circuit, a current foldback circuit, an inductor and an audio detecting interface arranged at one end of the inductor. On one hand, the test circuit for the VHF transceiver can conduct a modulation degree test and meanwhile can protect a triode in the VHF transceiver against damage, and can test the audio distortion degree and sidetone audio response. On the other hand, a signal can be effectively attenuated by utilizing the RF attenuator, so that a test device is protected against damage. Meanwhile, the RF attenuator can be used to effectively reduce power entering the power meter, and high precision frequency can be tested.

Description

technical field [0001] The invention relates to the technical field of testing, and more specifically relates to a VHF transceiver testing circuit. Background technique [0002] The very high frequency (VHF) communication system provides voice and data line-of-sight communication for the crew, including two-way voice communication with ground traffic controllers and aircraft-to-aircraft communication during takeoff, landing, and when the aircraft passes through controlled airspace. Two-way voice communication, etc. [0003] Due to the high power of the VHF transceiver when transmitting, it is easy to cause damage to the test equipment. Therefore, a 40dB fixed power attenuator is used to attenuate the signal and then enter the communication comprehensive test equipment IFR2948 to avoid damage to the measuring instrument. When the VHF transceiver is transmitting, since the modulation degree must reach at least 70%, and the heating triode used for modulation on the VHF transce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/15H04B17/29
Inventor 冯大聪
Owner JR TECH GUANGZHOU
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