ON4CJU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Locator transmitted in a decoded message: JO20

Receiver-side FT8 activity involving ON4CJU, decoded by SO8OO in southeastern Poland. 1,339 related FT8 messages, 922 CQ messages, observed on 160m, 80m, 60m, 40m, 20m, across 28 UTC dates. Heard between 2026-05-30 and 2026-08-22.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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Overview

1,339

Related messages

922

CQ messages

UTC dates heard

-9 dB

Mean decoder S/N

Bands

80m 20m 40m 60m 160m

First seen: 2026-05-30
Last seen: 2026-08-22 19:38 UTC

Frequent QSO partners observed at SO8OO

Stations ON4CJU worked most often, as logged from our receiver:

R5AV · European Russia ×3 E70SZ · Bosnia-Herzegovina ×3 IK4IDY · Italy ×2 SV9MBH · Crete ×2 YO6BGT · Romania ×2 IQ2UL · Italy EA4GZI · Spain DL3HO · Fed. Rep. of Germany DG4BZ · Fed. Rep. of Germany CT2HEX · Portugal LU3DLY · Argentina IW5ALZ · Italy

Activity Heatmap

Locator transmitted by ON4CJU

Approximate centre of JO20, decoded 2026-08-22 21:38 UTC. A transmitted locator is not proof of the operator's permanent location.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Time UTC	Band	ON4CJU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-22 21:38	40m	-7 / -	UN7PPV	- / -15	3	✓ Closing fragment
08-22 21:31	20m	-15 / -15	PY5EJ	-14 / -	4	✓ Closing observed
08-21 20:47	40m	-7 / -	HV0KIS	- / -1	11	Partial capture
08-21 20:42	40m	-4 / -	OK/PE5EIE	- / +1	2	Partial capture
08-21 19:23	20m	-7 / -	ZV8R	- / -15	3	✓ Closing fragment
08-21 18:39	20m	-9 / -12	OK2CNI	+10 / +5	4	✓ Full exchange observed
08-21 18:31	20m	-8 / -	IZ3LCF	+2 / -19	5	Partial capture
08-21 17:45	20m	-10 / +5	UT2UCI	-9 / -	4	✓ Closing observed
08-20 21:58	20m	-6 / -	ND9M	- / -	2	✓ Closing fragment
08-20 21:50	20m	-8 / -	AA9NN	- / -24	4	✓ Closing fragment
08-20 21:36	20m	-2 / -	LU3DLY	- / -3	2	✓ Closing fragment
08-20 21:25	80m	-6 / -17	DO4HHK	-14 / -17	5	✓ Full exchange observed
08-20 21:19	80m	-6 / -10	YO6BGT	+8 / -11	4	✓ Full exchange observed
08-20 21:16	80m	-5 / -	EA3FR	- / -16	2	✓ Closing fragment
08-20 21:14	80m	-6 / -	DO9FSE	-16 / -18	3	✓ Closing observed
08-20 21:11	80m	-6 / +4	F6GGA	-14 / +4	5	✓ Full exchange observed
08-20 21:11	80m	-6 / -14	UB3BGN	-2 / -23	7	✓ Full exchange observed
08-20 21:09	80m	-4 / +3	DK0ACI	+5 / -2	4	✓ Full exchange observed
08-20 21:07	80m	-3 / -12	YT1DDL	-2 / -15	5	✓ Full exchange observed
08-20 21:05	80m	-8 / -12	DL3RDO	+2 / +6	5	✓ Full exchange observed
08-20 21:04	80m	-8 / -2	DB4SNK	0 / +7	4	✓ Full exchange observed
08-20 20:59	60m	-12 / -	DD1GR	- / -2	6	✓ Closing fragment
08-20 20:58	60m	-11 / +3	EI7GSB	-11 / 0	5	✓ Full exchange observed
08-20 20:53	40m	-3 / -6	F1JIO	-4 / -	8	✓ Closing observed
08-20 20:28	40m	-4 / -	ON4MAP	- / -22	2	✓ Closing fragment
08-20 20:26	40m	-1 / -1	SQ1MNG	+10 / +1	5	✓ Full exchange observed
08-20 20:23	40m	-6 / -6	EA4DZR	-13 / -8	4	✓ Full exchange observed
08-20 20:20	40m	-2 / -6	DL2CZ	+4 / -	5	✓ Full exchange observed
08-20 20:18	40m	-2 / -	IV3LAN	- / -9	2	✓ Closing fragment
08-20 20:14	40m	+3 / -	M7GOA	- / -19	4	Partial capture
08-20 20:13	40m	+4 / -1	CT2HEX	-8 / -5	5	✓ Full exchange observed
08-20 19:28	40m	0 / -	DB3MAX	- / +2	2	✓ Closing fragment
08-20 19:27	40m	-2 / -9	RA4Y	-1 / 0	5	✓ Full exchange observed
08-20 19:24	40m	- / -8	F4VTR	-1 / -	3	Partial capture
08-20 19:20	40m	-10 / -	M3FGR	-15 / +3	7	Partial capture
08-20 19:18	40m	-6 / -9	HF0TT	0 / -	3	✓ Closing observed
08-19 17:35	20m	- / -8	F1THK	-4 / -	3	✓ Closing fragment
08-19 17:02	20m	- / -7	EA1AJT	-12 / -	3	✓ Closing fragment
08-18 21:42	40m	-15 / -	CS7BHA	- / +5	2	Partial capture
08-18 21:39	40m	-14 / -	EA1FRJ	- / -15	2	✓ Closing fragment
08-18 21:38	40m	-16 / -	SP5WS	- / -12	2	✓ Closing fragment
08-18 21:36	40m	-16 / -	EA8CVR	- / -6	2	✓ Closing fragment
08-18 20:29	40m	-12 / -	SQ8AA	- / 0	2	✓ Closing fragment
08-18 19:48	40m	-11 / -	IV3BHD	+1 / +6	3	✓ Closing observed
08-18 19:41	40m	-14 / -	M7GOA	- / -24	12	Partial capture
08-18 19:24	40m	-12 / -	OE5FSQ	- / +4	2	✓ Closing fragment
08-18 19:16	40m	-13 / -16	R3KON	-7 / -3	4	✓ Full exchange observed
08-18 18:53	40m	-15 / -9	SP6AMI	-16 / -	3	✓ Closing observed
08-18 18:43	40m	-10 / +4	M5RJC	-16 / -	5	✓ Full exchange observed
08-18 18:25	40m	- / -13	DC1SH	-18 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

40m

UTC    dB Audio  Message
204730 -11  929  HV0KIS ON4CJU -01 (x10)
213745  -6 2002  CQ ON4CJU JO20 (x2)
213845  -8 2002  UN7PPV ON4CJU R-15 (x3)

20m

UTC    dB Audio  Message
192845 -10 2577  CQ ON4CJU JO20
192915  -4 2577  SP6JIU ON4CJU +15
194145  -3 2577  CQ ON4CJU JO20 (x7)
212645 -11 2327  JH2BJL ON4CJU JO20
213045 -11 2023  CQ OC ON4CJU JO20
213100 -13 2241  ON4CJU PY5EJ GG54 (x2)
213145 -15 2023  PY5EJ ON4CJU RR73
213200 -13 2241  ON4CJU PY5EJ 73

80m

UTC    dB Audio  Message
212145  -2 2386  CQ ON4CJU JO20 (x8)
212530 -14 2387  ON4CJU DO4HHK JO54
212545  -4 2387  DO4HHK ON4CJU -17
212600 -13 2387  ON4CJU DO4HHK R-17
212615  -8 2387  DO4HHK ON4CJU RR73
212630 -16 2387  ON4CJU DO4HHK 73
212645  -3 2387  CQ ON4CJU JO20 (x2)

60m

UTC    dB Audio  Message
210900 -16 2245  CQ ON4CJU JO20 (x3)
205815 -11 2414  EI7GSB ON4CJU JO20
205830 -11  869  ON4CJU EI7GSB +03
205845 -11 2415  EI7GSB ON4CJU R+00
205900 -11  869  ON4CJU EI7GSB RR73
205915 -10 2415  EI7GSB ON4CJU 73
205945 -15 2414  DD1GR ON4CJU -02 (x6)
210245 -10 2414  CQ ON4CJU JO20

160m

UTC    dB Audio  Message
201330  -1 1709  ON4CJU DO2RG -06 (x2)
201600  -7 1092  ON4CJU PA3FR JO33 (x3)

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.