"On Tuesday, July 15^th and Wednesday, July 16^th, you were heard by a
Commission employee operating your amateur radio station for 20 minutes
without identifying in a timely manner. The Commission employee used
direction finding equipment and confirmed the transmissions were coming
from your location. The employee recorded the offending transmissions and
provided undersigned counsel with recordings of the incident in question.
Should you desire a copy of the recording, one will be made available to
you.
"This incident constitutes a failure to properly transmit your assigned
call sign in violation of the Commission's rules. Your operation as
described above is contrary to the basis and purpose of the amateur radio
service as set out in Section 97.1 and is a violation of Section 97.119(a)
of the Commission's rules.^ Section 97.119(a) states that "[e]ach amateur
station . . . must transmit its assigned call sign on its transmitting
channel at the end of each communication, and at least every 10 minutes
during a communication . . ." Please be advised that the Commission
expects you to abide by its rules."
The way this reads, the guy may have IDed at some point, but not the required amount of times... in which case the long-range DF would only have been used to confirm that the transmissions originated from the general known location of the licensee in question.
I don't believe the FCC would send a notice like this, based on a long-range DF only, without the operator having IDed at some point. That seems more like a "guess".
"The Commission employee used direction finding equipment and confirmed the transmissions were coming from your location."
Ah-- so that does read as if they had an address from license records, and just used the DF to confirm that the signals originated from that general area.