Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3HTM callsign genealogy
Currently held by CLAUSS JR, CARL F
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 W3HTM's current licensee, walking backwards.
- Clarkston, Raymond SMAgranted 2014-05-01cancelled 2020-05-08
Successor callsigns
Callsigns held now by people who previously held W3HTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3HTM, oldest first.
- CLAUSS JR, CARL F PA1996-09-11 → cancelled 2008-09-12
- Clarkston, Raymond S MA2020-05-08 active