What condition may be indicated if a VHF...

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Question 1 of 20jnv5C1LS3HBNA4MoR5T0

What condition may be indicated if a VHF radio is unable to contact nearby stations and an inline wattmeter indicates power outputs of 1 watt (LOW power) mode and 8.5 watts (HIGH power) mode with +12.8 vdc applied to the radio's DC line?

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Question 1 of 20

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🔍 Key Concepts

• VHF marine radio power settings (LOW vs HIGH) and typical wattage values • How FCC power limits apply to marine VHF transmitters • Difference between RF output power and audio/modulation stages in a transmitter

💭 Think About

• Compare the measured LOW and HIGH power readings to typical marine VHF LOW and HIGH output levels. Are these values reasonable? • Ask yourself whether a radio that cannot contact nearby stations, but shows these power readings, is more likely to have a problem with RF power output, with modulation, or with the antenna/feedline system. • Consider whether modulation (voice input) can cause a big change in the RF carrier power that an inline wattmeter reads.

✅ Before You Answer

• Verify what normal LOW and HIGH RF power levels are for a standard fixed-mount VHF marine radio. • Check whether FCC specifications allow the measured RF power values for a marine VHF transmitter on HIGH power. • Confirm whether an AF (audio frequency) or PA problem would primarily affect the RF carrier power, the audio modulation, or both.

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