Benjamin Seidenberg wrote:
Yes, the FCC. See part 97 of the FCC rules (US CFR Title 47), specifically § 97.113(1) 
Err, sorry, I meant § 97.113(a)(4). Also, my previous message applies to amateur operators in the US. Amateurs in other nations are similiary regulated by their equivelent to the FCC, with similar rules which are all based on ITU regulations.
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