[RTTY] callsign/callsign DQ

[Ryan Noguchi]

>Is USACALL/USACALL even a valid "callsign" to send out over the air, ever?


Yes, for US-licensed amateurs. See below for the reference in Part 97:

§97.119   Station identification.
(e) When the operator license class held by the control operator exceeds that of the station licensee, an indicator consisting of the call sign assigned to the control operator's station must be included after the call sign.


73, Ryan AI6DO