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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

WP4JSP callsign genealogy

Currently held by LOPEZ, ALFONSO

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 WP4JSP's current licensee, walking backwards.

  1. W9JSPactive· E
    PAHL, JEFFREY SWIgranted 2018-05-01
  2. K0JSPcancelled· E
    PAHL, JEFFREY SWIgranted 2017-06-02cancelled 2018-05-01
  3. KF4JVDcancelled· E
    PAHL, JEFFREY SMNgranted 2006-04-13cancelled 2007-08-25

Successor callsigns

Callsigns held now by people who previously held WP4JSP.

  1. WY9Jcancelled· E
    Santana, Jorge LPRgranted 2012-05-12cancelled 2012-08-21

All historical holders

Every license row we've seen with the callsign WP4JSP, oldest first.

  • LOPEZ, ALFONSO PR
    1992-01-07 → cancelled 2004-01-08
  • Santana, Jorge L WI
    2010-01-22 → cancelled 2012-05-12
← Back to WP4JSP License history →