Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4RPS callsign genealogy
Currently held by LAWSON, JOHN W
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 K4RPS's current licensee, walking backwards.
- Salman, Robert PGAgranted 2019-01-30cancelled 2019-02-20
Successor callsigns
Callsigns held now by people who previously held K4RPS.
- Speser, Robert PFLgranted 2013-06-07cancelled 2025-06-10
All historical holders
Every license row we've seen with the callsign K4RPS, oldest first.
- LAWSON, JOHN W TN1988-08-02 → cancelled 2000-08-03
- Speser, Robert P FL2010-11-09 → cancelled 2013-06-07
- Salman, Robert P GA2019-02-20 active