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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

KC0JMO callsign genealogy

Currently held by OYER, JOHNATHON M

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 KC0JMO's current licensee, walking backwards.

  1. KD0SYZcancelled· T
    OYER, JOHNATHON MKSgranted 2012-08-28cancelled 2012-12-01

Successor callsigns

Callsigns held now by people who previously held KC0JMO.

  1. K0ECSactive
    JOHNSON COUNTY EMERGENCY COMMUNICATIONS SERVICE, INC.KSgranted 2020-11-13

All historical holders

Every license row we've seen with the callsign KC0JMO, oldest first.

  • JOHNSON COUNTY EMERGENCY COMMUNICATIONS SERVICE INC KS
    2001-01-05 → cancelled 2001-01-27
  • OYER, JOHNATHON M KS
    2023-01-20 active
← Back to KC0JMO License history →