uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

W9BTI callsign genealogy

Currently held by ISENRING, HAROLD J

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 W9BTI's current licensee, walking backwards.

  1. W9TNYcancelled· G
    TIMME, ROBERT JINgranted 2010-03-12cancelled 2016-12-06
  2. KC9QPNcancelled· T
    TIMME, ROBERT JINgranted 2009-10-19cancelled 2010-03-12

Successor callsigns

Callsigns held now by people who previously held W9BTI.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W9BTI, oldest first.

  • ISENRING, HAROLD J WI
    1988-08-23 → cancelled 2000-08-24
  • TIMME, ROBERT J IN
    2016-12-06 active
← Back to W9BTI License history →