N9TPB FCC License Search

🕒 FCC license data updated today 7:15 am CDT (FCC files through Oct 28, 2026) · next update tomorrow 6:00 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)

W9UDX HAM

✅ Available for a vanity request — free since Feb 20, 2019.

1x3 call: Technician, General, Advanced and Amateur Extra licensees can request it. No pending applications list it.

📬 QSL: no LoTW uploads on record · not eQSL AG · QRZ · HamQTH

Not currently held · 1 holder on record · available since Feb 20, 2019

Previous holder: DUANE A RITSCHKE

Held W9UDX Apr 28, 1987 → Feb 19, 2017 · first licensed Apr 28, 1987 as W9UDX · 1 license · FRN 0015757610
📖 In the printed callbooks since 1953 as W9UDX, before the FCC's online records

W9UDX Expired Amateur Extra Apr 28, 1987 → Feb 19, 2017 (expired)

Licensee
DUANE A RITSCHKE

Address
1734 DELAWARE ST
OSHKOSH, WI 54901
44.0628, -88.5358 (ZIP center) · Grid EN54rb · CQ 4 · ITU 8 · map ↗

FRN
0015757610

Last granted
Nov 21, 2006

Effective
Nov 21, 2006

Last action
Feb 20, 2019
FCC actions (3)
- Feb 20, 2019 — License expired LIEXP
- Nov 21, 2006 — License renewed LIREN
- Nov 21, 2006 — FCC action LITIN

Callbook Records, 1993–2003

From the FCC amateur database as published on the QRZ! callsign CD-ROMs, 1993–2003, before and alongside the FCC's online records (which start in 1999). "Seen" dates are the first and last disc showing that record; the issue date is the FCC's, so it can be a renewal of an even older license.

Seen Oct 8, 1999 → Apr 17, 2003 · 8 discs
W9UDX · Amateur Extra · issued Apr 19, 1999, expires Feb 19, 2007
DUANE A. RITSCHKE
1734 DELAWARE ST, OSHKOSH, WI 54901
Seen Apr 7, 1999 · 1 disc
W9UDX · Advanced · issued Feb 24, 1999, expires Feb 19, 2007
DUANE A RITSCHKE
1734 DELAWARE ST, OSHKOSH, WI 54901
Seen Apr 4, 1997 → Nov 11, 1998 · 3 discs
W9UDX · General · issued Feb 19, 1997, expires Feb 19, 2007
DUANE A RITSCHKE
1734 DELAWARE ST, OSHKOSH, WI 54901
Seen Sep 9, 1993 → Oct 27, 1996 · 7 discs
W9UDX · General · issued Apr 28, 1987, expires Apr 28, 1997
DUANE A RITSCHKE
1734 DELAWARE ST, OSHKOSH, WI 54901

Address history

From FCC database snapshots (2004 → now). "Seen" dates are the first and last snapshot showing that address.

Seen Nov 7, 2004 → Oct 25, 2026 · 51 snapshots · as W9UDX
DUANE A RITSCHKE
1734 DELAWARE ST, OSHKOSH, WI 54901
44.0628, -88.5358 (ZIP center) · Grid EN54rb · CQ 4 · ITU 8 · map ↗

W9UDX in the Printed Callbooks, 1909–1997

From scanned copies of the printed callbooks (government lists from 1913, then the Radio Amateur Callbook to 1997), read by OCR, so names and streets can carry typos. Each line is one or more editions in a row showing the same name at the same address.

1997 · 1 edition
W9UDX · class G
Duano A Riise Kef 1134 Delaware S~ Oshkosh
, WI 54901
1997 p.1956
1996 · 1 edition
W9UDX · class G
Duane A Riise Ket 1734 Deaware St
Oshkosh, WI 54901
1996 p.1883
1989 · 1 edition
W9UDX · class G
Duane A Ritschke
1734 Delaware St, Oshkosh, WI 54901
Winter 1989 p.1273
1986 · 1 edition
W9UDX · class G
Duane A Ritschke
!734 Delaware St, Oshkosh, WI 54901
Winter 1986 p.1209
1980 → 1984 · 2 editions
W9UDX · class G
Duane A. Ritschke
1734 Delaware St, Oshkosh Wi ~m1
Winter 1980 p.1071, Winter 1984 p.1207
1979 · 1 edition
W9UDX · class G
Duane A. Rilscl1ke
1734 Delaware 51. Oshkosh, WI 54801
Winter 1979 p.501
1971 → 1978 · 7 editions
W9UDX · class G
Duane A. Ritschke
1734 Delaware St, Oshkosh, WI 54901
Fall 1971 p.613, Winter 1972 p.620, Winter 1973 p.619, 1974 p.587, Winter 1975 p.613, Winter 1977 p.673, Winter 1978 p.931
1969 · 1 edition
W9UDX · class G
Duane A . R I T S C H K E
1 7 3 4 Delaware S T, Oshkosh Wi
Summer 1969 p.593
1966 · 1 edition
W9UDX
Duane A. Ritschke1 1326 Kentucky St1 Oshkosh

Spring 1966 p.548
1965 · 1 edition
W9UDX
Duane Ae Rltschke
1326 Kentucky St, Oshkosh Wisc
Summer 1965 p.546
1964 · 1 edition
W9UDX
D U A N E A. R I T S C H K E
1326 K E N T U C K Y St. O S H K O S H Wisc
Fall 1964 p.533
1963 · 1 edition
W9UDX
Duane A. Ritschke
1326 Kentucky St, Oshkosh L'/isc
Summer 1963 p.569
1958 → 1962 · 6 editions
W9UDX
Duane A. Ritschke
22 Eveline St., Oshkosh
Summer 1958 p.449, Spring 1959 p.465, Winter 1960 p.533, Spring 1961 p.535, Fall 1961 p.562, Fall 1962 p.544
1957 · 1 edition
W9UDX
Duane A . R I T S C H K E
52 E V E L I N E S T R E E T, O S H K O S H, WI
Fall 1957 p.431
1953 → 1956 · 5 editions
W9UDX
Duane A. Ritschke
52 Eveline Street, Oshkosh, WI
Fall 1953 p.292, Spring 1954 p.301, Fall 1954 p.307, Fall 1955 p.364, Spring 1956 p.360
1941 → 1946 · 2 editions
W9UDX
W. W. Waite
Bowman Field, Louisville, KY
Winter 1941 p.221, Summer 1946 p.212
1936 → 1938 · 2 editions
W9UDX
C. N. Wulfsben:
305 Mill St., Decorah.iowa.
Spring 1936 p.310, Spring 1938 p.173
None · 1 edition
W9UDX · class G
Duane A. Ritschke
1734 Delaware St, Oshkosh
None p.587

📡 On the Air: APRS, Digital & WSPR Spots

No APRS positions, PSK Reporter reports or WSPR spots for W9UDX in the last 24 hours. They show up here within seconds of W9UDX beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.