Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1JO callsign genealogy
Currently held by Klenk, Robert T
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 AB1JO's current licensee, walking backwards.
- Klenk, Robert TMAgranted 2008-03-18cancelled 2008-09-16
Successor callsigns
Callsigns held now by people who previously held AB1JO.
No current licensee on record previously held this callsign.