🕒 FCC license data updated yesterday 9:45 am CDT · next update today 7:15 am CDT
Ask: HAMs within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WI · old CB calls like KHC1939 or 18Q3518 (1962–63 CB call books) · (205) 546-1767 (1990s CB directory phones)
until Sep 29, 2026: PO Box 6593, , Laguna Niguel, CA 92607-6593
FCC actions (4)
Sep 29, 2026 — License modified LIMOD
Sep 23, 2025 — License modified LIMOD
May 1, 2025 — License issued LIISS
May 1, 2025 — Systematic call sign granted SYSGRT
Address history
From FCC database snapshots (2004 → now). "Seen" dates are the first and last snapshot showing that address.
Seen May 29, 2025 → Oct 11, 2026 · 5 snapshots · as KO6JCA
Jeffrey A Markoff
PO Box 6593 Laguna Niguel, CA 92607
📡 On the Air: APRS, Digital & WSPR Spots
No APRS positions, PSK Reporter reports or WSPR spots for KO6JCA in the last 24 hours. They show up here within seconds of KO6JCA beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.