Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4SDP callsign genealogy
Currently held by Palmer, Stephen D
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 KM4SDP's current licensee, walking backwards.
- Palmer, Stephen DFLgranted 2015-08-27cancelled 2015-10-02
Successor callsigns
Callsigns held now by people who previously held KM4SDP.
- Palmer, Stephen DFLgranted 2016-05-07