Question T2B04
From subelement T2 - T2B
Which of the following could be the reason you are unable to access a repeater whose output you can hear?
Why is this correct?
All three options can prevent repeater access. Improper transceiver offset means your radio transmits on the wrong frequency, so the repeater won't receive your signal. Wrong CTCSS tone means the repeater receives your signal but won't repeat it because you lack the required sub-audible 'key.' Wrong DCS (Digital Code Squelch) code creates the same problem as wrong CTCSS. Since any of these issues alone can block access, all choices are correct.
Memory tip
When troubleshooting repeater access problems, systematically check: frequency settings first (offset), then access codes (CTCSS/DCS). This logical progression from basic RF connection to access authorization helps isolate the specific failure point in repeater systems.
Learn more
Repeater access requires both proper RF connection and authorization. Think of it like entering a building: you need the right address (frequency offset) and the right key (CTCSS/DCS tone). In Part 97 terms, repeaters use emission standards and frequency privileges to serve amateur stations, but access control systems like CTCSS prevent interference from spurious signals while maintaining efficient spectrum utilization in crowded VHF/UHF bands.
Think about it
Why do you think repeaters use multiple layers of access control rather than just relying on frequency separation alone?