Another control unit for the Lighthouse on the AT90S1200. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Frequency synthesizers
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The control unit of the synthesizer of the station "Mayak" provides control of the synthesizer with a step of 25 kHz and is another example of building something from nothing. The goal was to assemble a control unit with a not very sophisticated interface from currently available trash. To date, this device has lost its relevance due to the difficulty of getting "Mayakov".
Usually, 1 receive / transmit channel is sewn onto the Mayak synthesizer using jumpers or a biscuit switch with a diode decoder is installed (approximately 10 - 15 diodes for each channel). There are many microprocessor control units using different bases: from a computer with a 386 processor to the more popular 8048 (see Radio magazine, RA9UCN). They also do it on my favorite AVR microcontrollers. The main advantage and difference from other designs is that I personally made this crap for myself (well, or for a drinking buddy). Also, this feat was prompted by the fact that the authors do not upload the source code or at least the firmware.
In the control unit, a cheap (50 rubles in the St. . Also, the advantage is the presence of non-volatile memory (EEPROM), which allows you to quickly change the memory cells and frequency when turned on without using an external memory chip (type 70C24).
Блок управления
For some convenience, the "Transmission" and "Squelch" inputs are connected to the Mayak synthesizer via keys on the KT315.
The program displays the frequency from the "0" memory cell to the indicator and to the synthesizer. Then the microcontroller goes to sleep, turning off the clock generator, in order to reduce reception interference. When you press any of the buttons, the zero potential passes through the corresponding diode to the interrupt input of the microcontroller and wakes it up. The program looks at the code of the pressed key, and, having performed the appropriate actions, turns off the clock generator of the microcontroller.
At the moment, the interface is slightly larger than the minimum: Source code (4KB)
UP frequency up, new frequency on the indicator
DOWN frequency down, the indicator shows a new frequency
SCAN scan, on the indicator "SCA"
UP - scanning up in frequency, the current frequency is on the indicator
MEM - memory scan, current frequency on the indicator
"TX" - turn on / off the repeater diversity, the indicator lights up or goes out - LED
MEM work with memory, on the indicator "with?" (? - cell number, from 0 to 9). Cell #0 contains the power-on frequency.
UP - cell number plus 1
DOWN - cell number minus 1
SCAN - read frequency from selected cell
"TX" - write the current frequency to the selected cell
Here is the source code of the program and codes for the firmware. While taking up half the memory. Everything rests on the curvature of the indicator. Yes, it's enough for me.
The scanning speed depends on the frequency of the quartz resonator, I have a 2 MHz quartz, the speed is high, but the receiver clearly captures the signal. No lesions were observed. Capacitances supporting quartz to the ground 10 - 100 pF.
Some things are left for future versions of the control program. Naturally, it will be updated, and there is a high probability of using the LCD.
If you use a powerful Krenka in the control unit, then the indicators can be powered from +5 volts, naturally the brightness will drop, which is why I feed the indication from +9 volts.
The printed circuit board of the device was developed taking into account the fact that a microcontroller in a standard DIP version will be installed. When using the device in SMD (surface mount) design, the board is not much smaller and more difficult to solder at home. 78L05 (small-sized KRENka) is used as a power stabilizer. Diodes (KD522) are soldered vertically, the second terminals of the diodes are connected by a wire jumper, which is soldered into the hole opposite the output "6" of the microcontroller (D2 / INT0).
The board with two 561IR2 to which the synthesizer control code is output is hidden under the synthesizer cover and powered by +9 volts.
The indicator is assembled by surface mounting. 3 pieces of 561IR2 are glued to its back wall and wired to the indicator leads. LED indicator from a Chinese radio with a frequency meter. Three lower digits are displayed, if the frequency is up to 145 MHz, then three lower digits are displayed, if above, in the most significant digit ("1"), the upper element lights up, showing "550" on the indicator. It was possible to get by with two 561IR2, because. the last digit is "0" or "5", but with further development I plan to display the number of the memory cell on the indicator: from "0" or scan "SCA".
Successive registers are assembled in the same way. They differ only in that 3 IR2s are used for indication, and in the synthesizer 2 IR2s.
Sequential registers
There shouldn't be any problems with PCB layout. Structurally, everything is assembled on two boards: a processor board and a synthesizer code installation.
Author: RW9UAO; Publication: N. Bolshakov, rf.atnn.ru
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