Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB1W callsign genealogy
Currently held by CLAVET, MARK K
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 WB1W's current licensee, walking backwards.
- Mac Pherson, Richard EMAgranted 2005-08-06cancelled 2006-09-23
Successor callsigns
Callsigns held now by people who previously held WB1W.
- CLAVET, MARKTXgranted 2024-08-08
All historical holders
Every license row we've seen with the callsign WB1W, oldest first.
- CLAVET, MARK K TX1999-10-16 → cancelled 2004-09-04
- MacPherson, Richard E MA2026-07-25 active