N9TPB
FCC License Search
🕒 FCC license data updated yesterday 7:15 am CDT (FCC files through Oct 4, 2026) · next update today 6:00 am CDT
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HAMs within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WIKL4CX HAM
Amateur Extra class
licensed since 2015 (11 yrs)
Summerville, SC
grid EM93wa
LoTW user
59 repeaters within 50 mi
🔒 Not available — currently licensed, through Jun 9, 2035. If it isn't renewed, it opens for vanity requests Jun 10, 2037.
📬 QSL: LoTW user · last upload Sep 21, 2016 · not eQSL AG · QRZ · HamQTH
Currently held by Carl D Knapp · 1 holder on record
Current holder: Carl D Knapp
Held KL4CX Jun 9, 2015 → present · first licensed Jun 9, 2015 as KL4CX · 1 license · FRN 0024666299
-
- Licensee
- Carl D Knapp
- Address
- 301 Mendenhall St
Summerville, SC 29483
- FRN
- 0024666299
- Last granted
- Apr 11, 2025
- Effective
- Jun 30, 2026
- Last action
- Jun 30, 2026
FCC actions (10)
- Jun 30, 2026 — Administrative update LIAUA
- Feb 27, 2026 — Administrative update LIAUA
- Apr 11, 2025 — License renewed LIREN
- Dec 14, 2019 — Administrative update LIAUA
- Aug 8, 2018 — Administrative update LIAUA
- Apr 21, 2017 — Administrative update LIAUA
- Jun 16, 2016 — License modified LIMOD
- Oct 14, 2015 — Administrative update LIAUA
- Jun 9, 2015 — License issued LIISS
- Jun 9, 2015 — 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 Sep 27, 2026 → Oct 4, 2026 · 2 snapshots · as KL4CX
Carl D Knapp
301 Mendenhall St, Summerville, SC 29483 - Seen Apr 16, 2022 → Sep 25, 2025 · 11 snapshots · as KL4CX
Carl D Knapp
8095 Brookville Way, Avon, IN 46123 - Seen Sep 3, 2018 → May 6, 2019 · 3 snapshots · as KL4CX
Carl D Knapp
7619 Gold Coin Dr, Avon, IN 46123 - Seen May 12, 2017 → May 7, 2018 · 5 snapshots · as KL4CX
Carl D Knapp
10531 Chatanika Loop, Eagle River, AK 99577 - Seen Nov 16, 2015 → Feb 15, 2017 · 10 snapshots · as KL4CX
Carl D Knapp
12229 Winter Park Pl, Eagle River, AK 99577 - Seen Aug 2, 2015 → Sep 18, 2015 · 2 snapshots · as KL4CX
Carl D Knapp
6810 Gold Kings Cir Unit C, Anchorage, AK 99504
📡 On the air: APRS, digital & WSPR spots
No APRS positions, PSK Reporter reports or WSPR spots for KL4CX in the last 24 hours. They show up here within seconds of KL4CX beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.
Repeaters within 50 miles
59 repeaters within 50 miles of this address, closest first · sort: closest · most active · map these & export for a radio →
● confirmed on the air · ● probably · ● reported off the air · ● unknown · ◉ this license · ring = 50 miles · click a dot for the repeater's page
● confirmed on the air · ● probably · ● reported off the air · no dot = unknown (hover a dot for the evidence)
| Miles | Call | Name | Output | Offset | Tone | Mode | Networks | Activity | Location |
|---|---|---|---|---|---|---|---|---|---|
| 1.8 | KC4ED | Summerville KC4ED |
442.3000 | +5 | none | FM (analog) | — | Summerville, SC | |
| 2.4 | KX4DOR | Summerville KX4DOR |
145.2800 | -0.6 | none | D-STAR | — | Summerville, SC | |
| 2.4 | KX4DOR | Summerville KX4DOR |
442.8375 | +5 | none | D-STAR | — | Summerville, SC | |
| 2.7 | WX3C Listed as WX3C VHF |
SUMMERVILLE WX3C BM |
147.2500 | +0.6 | CC7 | DMR | BrandMeister 312093 | — | SUMMERVILLE, SC |
| 2.7 | WX3C Listed as WX3C UHF |
SUMMERVILLE WX3C BM |
443.3700 | +5 | CC7 | DMR | BrandMeister 311239 | — | SUMMERVILLE, SC |
| 2.7 | WX3C | Boynton Beach WX3C BM |
902.9875 | +25 | CC7 | DMR | BrandMeister 312098 | — | Boynton Beach, FL |
| 3.6 | N2OBS | Ladson N2OBS EchoLink |
443.7750 | +5 | TSQL 123.0 | FM (analog) | EchoLink 99729 | — | Ladson, SC |
| 4.3 | W4HRS | Summerville Med W4HRS |
146.9850 | -0.6 | TONE 123.0 | FM (analog) | — | Summerville, SC | |
| 5.6 | W4HRS | Nort Trident Hos W4HRS |
146.7300 | -0.6 | TONE 123.0 | FM (analog) | — | North Charleston, SC | |
| 6.5 | WA4NMW | Knightsville WA4NMW |
147.2250 | +0.6 | TSQL 123.0 | FM (analog) | — | Knightsville, SC | |
| 7.5 | WA4USN | Knightsville WA4USN |
146.9400 | -0.6 | TSQL 123.0 | FM (analog) | — | Knightsville, SC | |
| 7.5 | WA4USN | Mount Pleasant WA4USN |
441.4500 | +5 | TSQL 123.0 | FM (analog) | — | Mount Pleasant, SC | |
| 10.3 | KX4DOR | Ridgeville KX4DOR |
443.8000 | +5 | CC1 | DMR | — | Ridgeville, SC | |
| 11.2 | NE2S | Hanahan NE2S BM |
439.5000 | -5 | CC1 | DMR | BrandMeister 316694501 | — | Hanahan, SC |
| 13.5 | N9HQC | Ravenel N9HQC BM |
443.9000 | +5 | TONE 123.0 | FM (analog) (DMR,FM) | BrandMeister 314755 | — | Ravenel, SC |
| 14.0 | W4BRK | Moncks Corner W4BRK |
146.6100 | -0.6 | TSQL 123.0 | FM (analog) | — | Moncks Corner, SC | |
| 14.2 | W4HNK | Dorchester W4HNK |
147.1800 | +0.6 | TONE 123.0 | FM (analog) | — | Dorchester, SC | |
| 14.2 | W4HNK | Dorchester W4HNK |
443.8000 | +5 | TONE 123.0 | FM (analog) | — | Dorchester, SC | |
| 14.3 | W4HRS | Moncks Corne EOC W4HRS |
145.4900 | -0.6 | TONE 103.5 | FM (analog) | — | Moncks Corner, SC | |
| 14.6 | W4ANK | Jedburg W4ANK |
147.2700 | +0.6 | TONE 123.0 | FM (analog) | — | Jedburg, SC | |
| 15.1 | KK4B | Cordesville KK4B |
145.3500 | -0.6 | TSQL 162.2 | FM (analog) | 🗓 2 nets | 2 nets · 35 check-ins · 24 stations | Cordesville, SC |
| 16.3 | W4HRS | Charleston W4HRS |
444.7750 | +5 | TONE 123.0 | FM (analog) | — | Charleston, SC | |
| 17.1 | W4HRS | Charleston W4HRS |
145.1600 | -0.6 | none | D-STAR | — | Charleston, SC | |
| 17.1 | W4HRS | Charleston W4HRS |
444.1125 | +5 | none | D-STAR | — | Charleston, SC | |
| 17.1 | WR4SC | Charleston WR4SC |
147.1050 | +0.6 | TSQL 123.0 | FM (analog) | 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Charleston, SC |
| 17.1 | WR4SC | Florence WR4SC |
441.5750 | +5 | TSQL 91.5 | FM (analog) | 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Florence, SC |
| 17.1 | WR4SC | Charleston WR4SC NC-PRN |
443.0375 | +5 | CC1 | DMR | NC-PRN 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Charleston, SC |
| 17.3 | K4IUG | Charleston K4IUG |
224.6600 | -1.6 | TSQL 210.7 | FM (analog) | — | Charleston, SC | |
| 17.4 | K4IUG | West Ashley FS 1 K4IUG |
443.3750 | +5 | TSQL 100.0 | FM (analog) | — | West Ashley, SC | |
| 20.5 | W4HRS | Charleston MUSC W4HRS IRLP |
145.4500 | -0.6 | TONE 123.0 | FM (analog) | IRLP 4557 | — | Charleston, SC |
| 20.5 | W4HRS | Charleston MUSC W4HRS |
444.8250 | +5 | TONE 123.0 | FM (analog) | — | Charleston, SC | |
| 21.4 | WA4USN | Charleston USS WA4USN |
146.7900 | -0.6 | TONE 123.0 | FM (analog) | — | Charleston, SC | |
| 22.9 | K4IUG | Mt Pleasant K4IUG NONE-USE-C |
443.4500 | +5 | TSQL 100.0 | FM (analog) (DMR,FM) | NONE-USE-CONTACT99 | — | Mt Pleasant, SC |
| 23.4 | K4IUG | Adams Run K4IUG |
147.3450 | +0.6 | TSQL 141.3 | FM (analog) | — | Adams Run, SC | |
| 26.7 | KA4GDW | Saint George M&M KA4GDW |
147.0450 | +0.6 | TSQL 103.5 | FM (analog) | — | Saint George, SC | |
| 26.9 | WR4SC | Charleston WR4SC |
146.7600 | -0.6 | TSQL 123.0 | FM (analog) | 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Charleston, SC |
| 26.9 | WR4SC | Charleston WR4SC NC-PRN |
442.4625 | +5 | CC1 | DMR | NC-PRN 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Charleston, SC |
| 26.9 | KR4CHS | Awendaw KR4CHS |
145.1200 | -0.6 | none | D-STAR | 🗓 1 net | 1 net | Awendaw, SC |
| 27.1 | WR4SC | Saint George WR4SC NC-PRN |
440.6500 | +5 | CC1 | DMR | NC-PRN 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | Saint George, SC |
| 27.7 | KK4B | Russellville KK4B |
147.3000 | +0.6 | TSQL 162.2 | FM (analog) | 🗓 2 nets | 2 nets · 35 check-ins · 24 stations | Russellville, SC |
| 30.9 | WA4USN | Seabrook Island WA4USN |
145.4100 | -0.6 | TONE 123.0 | FM (analog) | — | Seabrook Island, SC | |
| 31.3 | KG4BZN | Walterboro KG4BZN |
147.1350 | +0.6 | none | FM (analog) | — | Walterboro, SC | |
| 31.3 | KG4BZN | Walterboro KG4BZN |
444.5500 | +5 | TONE 123.0 | FM (analog) | — | Walterboro, SC | |
| 31.5 | W4HRS | Walterboro Colle W4HRS |
444.8500 | +5 | TONE 123.0 | FM (analog) | — | Walterboro, SC | |
| 32.3 | KJ4QLH | Vance KJ4QLH |
146.8050 | -0.6 | TSQL 156.7 | FM (analog) | — | Vance, SC | |
| 34.9 | N7GZT | Vance N7GZT AllStar |
442.2000 | +5 | DCS 023 | FM (analog) | AllStar 637122 AllStar 637121 | — | Vance, SC |
| 36.3 | W4APE | Greeleyville W4APE |
444.7500 | +5 | TSQL 123.0 | FM (analog) | — | Greeleyville, SC | |
| 37.9 | WA4SJS | White Hall WA4SJS |
146.9100 | -0.6 | TONE 156.7 | FM (analog) | — | White Hall, SC | |
| 37.9 | WR4SC | White Hall WR4SC NC-PRN |
442.3875 | +5 | CC1 | DMR | NC-PRN 🗓 2 nets | 2 nets · 207 check-ins · 97 stations | White Hall, SC |
| 38.3 | KA4GDW | Bowman KA4GDW |
146.8350 | -0.6 | TSQL 179.9 | FM (analog) | — | Bowman, SC | |
| 38.7 | KA4GDW | Bowman KA4GDW |
224.7800 | -1.6 | TSQL 179.9 | FM (analog) | — | Bowman, SC | |
| 39.3 | W4APE | Greeleyville W4APE EchoLink |
145.2300 | -0.6 | TONE 123.0 | FM (analog) | EchoLink 779467 | — | Greeleyville, SC |
| 39.7 | K4LMD | Branchville K4LMD |
145.2100 | -0.6 | TSQL 100.0 | FM (analog) | — | Branchville, SC | |
| 45.7 | KM4ABW | Manning Hosp KM4ABW |
145.1500 | -0.6 | TSQL 91.5 | FM (analog) | — | Manning, SC | |
| 49.0 | N0VQE | Beaufort SC N0VQE BM |
441.5000 | +5 | CC1 | DMR | BrandMeister 311042910 | — | Beaufort, SC 29907, SC |
| 3.6 | N2OBS offline | Ladson N2OBS EchoLink |
146.8650 | -0.6 | TONE 123.0 | FM (analog) | EchoLink 99729 | — | Ladson, SC |
| 22.9 | KK4ZBE offline | Mt Pleasant E KK4ZBE |
146.6850 | -0.6 | TSQL 162.2 | FM (analog) | — | Mt Pleasant, SC | |
| 37.8 | KJ4LNJ offline | Green Pond White KJ4LNJ |
444.0750 | +5 | none | D-STAR | — | Green Pond, SC | |
| 37.9 | KJ4LNJ offline | Green Pond S.C KJ4LNJ |
145.4800 | -0.6 | none | D-STAR | — | Green Pond, SC |