1. The signal generator can be used to adjust the sensitivity of the radio and walkie-talkie
The basic principle is to minimize the attenuation of the useful signal transmission by the filter tank in the receiving channel of the walkie-talkie, so that the walkie-talkie has a higher sensitivity, which is widely used in some amateur radio frequency conversion and self-made radio stations. The signal generator also plays the role of an analog air signal here. If the walkie-talkie itself has a received signal strength S meter or test point, you can use the signal generator to input a signal that makes the machine signal meter indicate about 30% strength (it is easy to see the effect of adjustment changes), and then follow the instructions in the walkie-talkie maintenance manual to adjust Receive the tank circuit and make the signal meter indicate the maximum. If the signal meter is full during the adjustment process, you can reduce the signal amplitude of the signal generator. Usually, in order to ensure the sensitivity of the entire frequency band, it is necessary to use the high-end, low-end, and center frequency points of the target frequency band as reference points for "uniform adjustment". For walkie-talkies without signal strength indication feedback, the receiver tank can only be adjusted by monitoring the improvement and deterioration of the signal-to-noise ratio in a low signal-to-noise ratio state. In fact, in addition to adjusting the receiving sensitivity of the walkie-talkie, the signal generator can also be used to adjust the radio and TV, as long as the signal generator can generate the same type of signal.
2. The signal generator can be used to debug the filter
The ideal instrument for debugging filters is a two-word line, a network analyzer, and a frequency sweeper, and one of its main functional components is a signal generator. In the absence of these advanced instruments, the signal generator can be used with high-frequency voltage measurement tools, such as ultra-high-frequency millivoltmeters, oscilloscopes with sufficiently high frequency, and measurement receivers, and the filter can be barely debugged. The basic principle is to measure The attenuation of the signal inside and outside the filter bandpass band. The signal generator plays the role of a standard signal source here. The signal generator generates a relatively strong signal of known frequency and amplitude, which is input from the INPUT terminal of the filter or duplexer, and the signal attenuation at the output terminal is measured. The bandpass filter requires that the in-band attenuation be as small as possible and the out-of-band attenuation be as large as possible, while the notch filter is just the opposite, the larger the notch frequency attenuation, the better. Because common signal generators transmit at a fixed single-point frequency, it is necessary to use multiple test points to “tune” the filter for debugging. If there is a swept frequency signal source and a matching spectrum analyzer, the overall frequency characteristics of the filter can be seen graphically, which is very convenient to debug.
3. The signal generator is used for debugging the voice circuit and modulation circuit of the walkie-talkie
The signal generator replaces the electret pickup and sends a 1 kHz single tone signal that meets the requirements to the "MICin" of the walkie-talkie (the input amplitude requirement will be indicated in the maintenance manual), and then makes the FM walkie-talkie in the transmitting state. Under normal circumstances, 1 kHz audio will be heard in the receiver, and the modulation amplitude of the walkie-talkie under test can be measured through the modulation meter. In this way, the voice modulation circuit of the FM walkie-talkie can be detected and adjusted (the modulation degree is generally adjustable inside the walkie-talkie). Generally, a walkie-talkie with 25 kHz interval FM modulation requires an audio frequency modulation system of about 4.5 kHz at 1 kHz. If the modulation of the FM walkie-talkie is too small, the voice will be light, and if the modulation is too large, it will affect the voice and increase the occupied bandwidth. Some walkie-talkies that transmit no voice faults can also measure the voice signal status step by step from the MICin through a similar method.
4. The signal generator is used for the maintenance of the audio power amplifier
The signal generator here plays the role of an ideal signal source. The signal source generates an audio sinusoidal signal of appropriate amplitude, which is used as the signal input of the audio power amplifier. By measuring the output amplitude and waveform of the audio power amplifier, we can judge whether the audio power amplifier circuit is basically working normally, including whether there is an abnormal state such as self-excitation and distortion.
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RFID is slightly slow in the performance that keeps it away from overtaking the barcode, which is in implementation as a reliable and cost-effective solution.
There can be interference in the signal and abundance of tags at one time can often confuse the reader.
Radio-frequency identification (RFID) is a wireless system to send and receive signals via radio-frequency electromagnetic fields.
A basic RFID system consists of RFID reader and RFID tags.
Passive tags are compact and come in many forms: Can be of the size of a keychain, credit card or a label.
