Question T1B09
From subelement T1 - T1B
Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?
Why is this correct?
All three factors make operating exactly at band edges risky. Calibration errors mean your displayed frequency may not match your actual transmission frequency. Modulation sidebands extend your signal beyond the carrier frequency, potentially spilling into unauthorized spectrum. Frequency drift, especially during radio warm-up, can shift your signal outside the band. Combined, these effects could cause unintentional out-of-band operation, violating FCC rules.
Memory tip
Remember the 'safety margin' principle: amateur radio operations require buffer zones. When exam questions list multiple technical reasons that all contribute to the same regulatory requirement, the 'all choices correct' pattern often applies. Look for scenarios where multiple independent factors create the same compliance need.
Learn more
Professional amateur practice involves staying several kilohertz inside band edges to maintain emission standards compliance. This conservative approach prevents spurious emissions and ensures your frequency privileges remain within authorized limits. The FCC's Part 97 emission standards require amateurs to prevent out-of-band transmissions, making this buffer zone both a technical best practice and a regulatory necessity for maintaining your operating privileges.
Think about it
Why do you think the FCC holds amateur operators responsible for staying within band limits even when equipment limitations might cause unintentional violations?