How often must a radiotelegraph station...

How often must a radiotelegraph station...

Question 1 of 27070VR47wbKLgaJQOq2MXEdY

How often must a radiotelegraph station transmit its call sign when a transmission is maintained for more than 20 minutes in the band 405-525 kHz?

Question 1 of 27070

Q

How often must a radiotelegraph station transmit its call sign when a transmission is maintained for more than 20 minutes in the band 405-525 kHz?

🔍 Key Concepts

• Radiotelegraph station identification rules in the MF band (405–525 kHz) • Difference between a fixed time interval requirement and a conditional exception (such as during public correspondence) • How requirements may change when a transmission exceeds a certain duration (more than 20 minutes)

💭 Think About

• Look for which option mentions a special condition that might apply when public correspondence (traffic with the public) is in progress. • Decide whether the rule is likely to require more frequent identification (shorter intervals) or allows longer gaps between identifications for long transmissions. • Ask yourself: does the regulation specify a fixed interval only, or does it allow an exception when you’re handling continuous traffic?

✅ Before You Answer

• Verify which choice references an exception for public correspondence and compare it to those that do not mention any exception. • Confirm that the rule is specifically about transmissions lasting more than 20 minutes in the 405–525 kHz band, not general VHF or other bands. • Check that the interval in the correct option is short enough to ensure regular station identification during a long continuous transmission.