All signals sound normal on an MF/HF...

🔍 Key Concepts

• How MF/HF single sideband (SSB) voice signals sound when the transmitter or receiver is slightly off frequency • The difference between a problem at the transmitting station vs. a defect in your own receiver • What a Beat Frequency Oscillator (BFO) is used for and when it affects the tone of a received signal

💭 Think About

• Ask yourself: if ALL other stations sound perfectly normal on this same receiver, where is the problem most likely located—on your ship, or at the distant station? • Think about which component, when faulty, would affect only one received signal versus affecting every signal you tune in. • Consider how an off‑tuned SSB signal sounds in headphones—does it become higher or lower pitched as you tune away from the carrier frequency?

✅ Before You Answer

• Confirm that the question states all other MF/HF signals are normal, so a receiver-wide defect is less likely. • Recall that BFO is mainly used for CW/telex reception, not standard SSB voice—check whether changing BFO would selectively affect just one voice signal. • Mentally simulate: if your receiver frequency reference (synthesizer, VCO, etc.) failed, would only one station be distorted, or would every station across the band be off-pitch?

All signals sound normal on an MF/HF receiver except one that has a very high pitched voice barely readable. What is the most likely cause?

The transmitter of the abnormal signal is off frequency.

The receiver frequency synthesizer circuit is defective.

The voltage controlled oscillator has failed.

The B.F.O. circuit is faulty.

🔍 Key Concepts

💭 Think About

✅ Before You Answer