Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD7MM callsign genealogy
Currently held by Sperka, Bruce A
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by AD7MM's current licensee, walking backwards.
- Sperka, Bruce AAZgranted 2014-06-30cancelled 2016-12-30
Successor callsigns
Callsigns held now by people who previously held AD7MM.
- Givens, James AORgranted 2017-06-13
All historical holders
Every license row we've seen with the callsign AD7MM, oldest first.
- Givens, James A OR2007-03-08 → cancelled 2007-04-21
- Sperka, Bruce A AZ2016-12-30 active