Theory of Operation
Marine Radio
MR F55 & MR F75
Total pages: 4
Страница 1: ...Theory of Operation Marine Radio MR F55 MR F75 Total pages 4...
Страница 2: ...a pin detect 55 75 3 X out crystal 8 MHz 55 75 25 TX Hi low power control 55 75 4 Test connect to GND 55 75 26 Keys scan pin 55 75 5 Vdd 5VDC input 55 75 27 Keys scan pin 55 75 6 DC power on control F...
Страница 3: ...output 55 75 TX While the PTT key was press down the TX ON control pin of MCU is low so Q120 will working and the Q122 cut off Vcc 5V Q120 E Q120 C TX DC 5V output VCO PLL 1 The VCO oscillator stage...
Страница 4: ...is by three group LC buildup There are L107 match C100 L100 match C102 and L101 match C103 TX modulation path TX modulation audio amplifier used low power quad operation amplifier IC107 LM324 buildup...
