วันพฤหัสบดีที่ 29 กันยายน พ.ศ. 2554

Low noise amplifier

Now introduce a low noise amplifier is a project. The project build for operate in Earth-Moon-Earth mode. It's use MMIC for amplifier the weak signal. MAX2611 is my selection. This IC has gain ~18dB at 144 MHz. In circuit is a simple design follow as data-sheet. Using an capacitor to filter Input and Output signal as I need to amplify. Until I measure, I think to do the redesign a circuit again. When I finish hope a improve a received weak signal from the moon.

วันเสาร์ที่ 10 กันยายน พ.ศ. 2554

Update L/C meter

After find more component for building the L/C meter design by VK3BHR. It can run until programed to MCU. Then supply 9VDC to board and adjust the Voltage for supply a contrast of display. I found the display has indicate "CALRIB", the program has running but its dos't continue to start. After problem occur I check the board what is wrong? Guess the problem is a relay pin isn't correct. I must go to shop again for get correct part for repair.