Digital FM stereo receiver 60-110 MHz with microprocessor control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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Brief technical characteristics:
Dimensions: 106x36x20 mm;
Supply voltage 11-15 V;
Current consumption 45 mA;
Sensitivity 1 µV;
The amplitude of the output low-frequency signal is 1 V (linear output);
- 60 channels of long-term memory;
- switching through memory channels;
- recording in the channel of the required frequency;
- mono/stereo mode;
- scan mode;
- indication of channel number and frequency on the LCD screen;
- LED indication of tuning to the station and the presence of a stereo signal;
- setting the intermediate frequency of the receiver and the boundaries of the reception range.
The receiver is a functionally completed unit with a line output, designed to be connected to UMLF. Actually, the receiver itself is assembled on a Sony CXA1538 chip. To control the operation of the receiver, an Atmel AT90S2313 microprocessor and a Philips TSA6057 frequency synthesizer are used. The widely used LCD from Holtek HT-1611 is used as an indicator. The indicator displays the channel number, frequency, as well as the "mono / stereo" mode.
The receiver implements the following functional algorithm:
When power is applied to the receiver, the frequency recorded in the first memory channel is set. Switching to another channel is carried out by briefly pressing the "-" or "+" button. If you hold down the "-" or "+" button for a long time, the accelerated channel selection is carried out.
The "mono/stereo" mode is selected by pressing the "M/S" button. In the "stereo" mode, a dash is displayed next to the channel number on the LCD display.
Scanning is carried out by briefly pressing the "SK/ZAP" button. In this case, a cyclic frequency scan is carried out within the selected reception range. Scanning stops automatically when a station is found. Forced stop of scanning is carried out by pressing any of the buttons. When the "stereo" mode is on, scanning is automatically stopped only at stations transmitting a stereo signal.
To write to a certain memory channel of a certain frequency, you need to:
- press the "SK/ZAP" button and hold it with the "-" and "+" buttons to select the desired memory channel;
- press the "M / S" button and hold it with the "-" and "+" buttons to dial the desired frequency;
- by pressing the "M / S" button, select the "mono" or "stereo" mode;
- then press the "SK/ZAP" button for 3 seconds until a dash appears next to the displayed frequency.
Recorded. When the power is turned off, the recorded data is retained. If you hold down the "SK/ZAP" button for a long time (more than 6 seconds), the frequency is erased from the selected memory channel. In this case, dashes appear in place of the displayed frequency. Now, when iterating through channels, this channel will not be displayed.
(click to enlarge)
To set the lower limit of reception when power is applied to the receiver, press the "-" button. The LCD display will show the set lower reception limit. Then use the "-" or "+" buttons to dial the desired frequency. Then press the "SK / ZAP" button for 3 seconds until a dash appears next to the displayed frequency. The lower limit of acceptance is recorded.
To set the upper limit of reception when power is applied to the receiver, press the "+" button. The LCD will display the set upper receive limit. Then use the "-" or "+" buttons to dial the desired frequency. Then press the "SK / ZAP" button for 3 seconds until a dash appears next to the displayed frequency. The upper limit of reception is recorded.
To set the intermediate frequency when power is applied to the receiver, press the "M / S" button. The LCD will display the set intermediate frequency. Then use the "-" or "+" buttons to dial the desired frequency. Then press the "SK / ZAP" button for 3 seconds until a dash appears next to the displayed frequency. Intermediate frequency recorded.
Publication: cxem.net
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