Therefore, most models cannot be operated concurrently, and are only used for a certain transceiver. Because of its detection circuit, the control circuit and coding method and interface do not have a universal protocol. Most of the finished products adopt the closing of automatic control switches to achieve the purpose of tuning. In fact, almost all antenna tuner structures and principles are the same. It can be seen from the figure that the structure is very simple. ![]() Schematic Diagramįigure 1 shows the schematic diagram of the antenna tuner circuit, and Figure 2 shows the actual diagram. This is because it is a tuning transformer, which improves the RF selection of the receiving device. In addition to increasing the strength of the signal, the antenna tuning device can reduce the spurious response of the receiver. Due to different antennas and operating frequencies, the impedance presented by the antennas can vary greatly. The impedance mismatch caused in this way will cause great loss to the signal transmission, and even cause the transceiver to malfunction or be damaged. Stepper2.The antenna tuner plays a very important role in short-wave radio communications. Lcd.setCursor(12, 1) //Start at character 12 on line 1 Lcd.setCursor(12, 0) //Start at character 12 on line 0 Lcd.setCursor(0, 0) //Start at character 0 on line 0 Lcd.setCursor(4, 0) //Start at character 4 on line 0 It is named for its most important component, a crystal detector, originally made from a piece of crystalline mineral such as galena. It uses only the power of the received radio signal to produce sound, needing no external power. Lcd.begin(20, 4) // initialize the lcd for 16 chars 2 lines, turn on backlight A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. Serial.begin(57600) // Used to type in characters Unsigned long lastStepper2AdjustTime = 0 Unsigned long lastStepper1AdjustTime = 0 LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE) // Set the LCD I2C address Set the pins on the I2C chip used for LCD connections: set the LCD address to 0x27 for a 20 chars 4 line display Int pos2 = 100*map(analogRead(sensorPin3), 0, 1023, 0, 49) + map(analogRead(sensorPin4), 0, 1023, 0, 99) Ĭonst byte buttonPin1 = A4 // Input pin for switching RELAY1 and RELAY2Ĭonst byte buttonPin2 = A5 // Input Pin for switching RELAY3 and RELAY4 Int sensorPin4 = A3 // select the input pin for the potentiometer for Fine Stepper 2 Int sensorPin3 = A2 // select the input pin for the potentiometer for Course Stepper 1 Int sensorPin2 = A1 // select the input pin for the potentiometer for Fine Stepper 2 Int sensorPin1 = A0 // select the input pin for the potentiometer for Course Stepper 1 Fixed value inductors and capacitors via relays digital pins 2,9,10,13ĪF_Stepper Stepper1 (200, 1) // A 200-step-per-revolution motor on channels 1 & 2ĪF_Stepper Stepper2 (200, 2) // A 200-step-per-revolution motor on channels 3 & 4 I am also going to need to add an addition stepper to control a second variable capacitor. It has been awhile since I have had a chance to work on this project, I am working on putting everything together in the remote tuner. I made a change to the int pos1 and int pos2 to reference the Pot during initialization? If the Pot's are anywhere other than 0 the stepper moves to that position. So I am still having problems when powering the Arduino on and off. I Have been reading lots trying different code sketch learning these devices, much different than the RF world I am used to. I tried an lcd.clear() but that just makes the LCD not work correctly.Īnyways thank you so much for your help. ![]() ![]() ![]() 99 the 10 seconds once 10 seconds has passed into the next "new " minute. I am having a similar issue with a timer where after 59 seconds the second display show 19, 29. When the LCD prints the position say from 4 to 25 and the back to 4 as an example there ends up being a 0 once the number of the position is less that 10. I will run down a buy a couple 10 k pots and see how that works. I also left the setup running over night and when I cam back tot eh desk i noticed the motor trying to make a step. I thought (several posts back) that the problem of the jitter had been fixed, I had made several large position changes with the pot, but as soon as I made small movements the jitter problem surfaced. I am using a 500 ohm pot, I need to dig up a 10K pot an use that. I added that line it seems to help a little.
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