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Theory Of Operation

Cobra MARINE MRF75, Theory Of Operation

The Cobra MARINE MRF75 manual provides detailed information on the Theory of Operation for this marine VHF radio. It can be downloaded for free from our website, making it easy for users to understand and utilize all the features of this reliable and high-quality communication device.

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Theory of Operation

Marine Radio

MR F55 & MR F75

Total pages: 4

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Summary of Contents for MARINE MRF75

Page 1: ...Theory of Operation Marine Radio MR F55 MR F75 Total pages 4...

Page 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...

Page 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...

Page 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...

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