IU4DTV — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Italy Most frequent locator attributed to this token: JN54

Receiver-side FT8 activity involving IU4DTV, decoded by SO8OO in southeastern Poland. 1,549 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 45 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-10.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 1,549 FT8 messages attributed to IU4DTV as the transmitting token by decoded message structure across 45 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (70%), followed by 20 m (23%) and 80 m (5%). Most decodes (62%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

1,549

Messages attributed

UTC dates decoded

311

Active 15-min windows

-9 dB

Estimated median S/N

Bands

80m · 78 60m · 5 40m · 1,088 20m · 356 10m · 22

First attributed message: 2026-06-06
Last attributed message: 2026-09-10 04:08 UTC

Observed FT8 message patterns

Attributed sample: 1,549 messages
Active dates: 45 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -20 to +1.1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 371, moderate (-15 to -9 dB) 440, strong (≥ -8 dB) 738.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with IU4DTV in decoded directed-looking exchanges:

IQ4JO · Italy ×3 SP7FID · Poland ×2 II0WWA · Italy ×2 ED7SUN · Spain ×2 EA3RT · Spain ×2 IQ9NI · Sicily ×2 UT5MD · Ukraine ×2 OZ3AAF · Denmark ×2 DK1RWR · Fed. Rep. of Germany ×2 HA1DCQ · Hungary ×2 PD1FL · Netherlands ×2 DL2DBI · Fed. Rep. of Germany ×2

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to IU4DTV

The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.

Attributed locator: JN54 · 126 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,013 km (approx.)
Last such locator decoded: 2026-09-07 19:39 UTC

A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.

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	IU4DTV S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-10 04:14	40m	- / -12	N4QS	-15 / -	2	✓ Closing fragment
09-09 21:24	40m	-20 / -6	M8MFU	-9 / -7	2	Partial capture
09-09 21:19	40m	-9 / -	YL3RK	- / -5	2	Partial capture
09-09 21:18	40m	+3 / -	F4HJG	- / -7	2	✓ Closing fragment
09-09 21:16	40m	-1 / -9	OZ3AAF	0 / -7	3	✓ Full exchange observed
09-09 21:02	40m	-11 / -	RX3ASQ	- / -5	2	Partial capture
09-09 20:48	40m	-3 / -	R1QF	-9 / -8	2	✓ Closing observed
09-09 20:44	40m	-2 / -	CT7AXN	- / -7	2	✓ Closing fragment
09-09 20:42	40m	+4 / -	DM2BM	- / -8	2	✓ Closing fragment
09-09 04:10	40m	- / -8	PA3EVY	-20 / -	2	✓ Closing fragment
09-08 04:14	40m	-8 / -7	W4PSK	-15 / -10	4	✓ Full exchange observed
09-08 04:09	40m	-4 / -	RT4A/QRP	- / 0	3	Partial capture
09-08 04:06	40m	-4 / -7	PV8AJ	-14 / -8	4	✓ Full exchange observed
09-08 04:05	40m	-4 / -	ON8BZ	- / -8	2	✓ Closing fragment
09-08 04:03	40m	-6 / -	W4PSK	- / -7	2	Partial capture
09-08 04:01	40m	-4 / -	SP7SZJ	- / -7	2	✓ Closing fragment
09-07 20:39	40m	-8 / -2	HA1DCQ	-13 / -2	4	✓ Full exchange observed
09-07 20:38	40m	-6 / -8	SP7OK	-8 / -10	3	✓ Full exchange observed
09-07 20:35	40m	-10 / 0	DL5YSD	-11 / -2	4	✓ Full exchange observed
09-07 20:31	40m	- / +1	EA7UW	-10 / -	2	✓ Closing fragment
09-07 20:27	40m	0 / -	M0THH	- / -11	2	✓ Closing fragment
09-07 20:26	40m	-5 / -8	IW6DGJ	+6 / -2	4	✓ Full exchange observed
09-07 20:20	40m	-4 / -	PD1RGW	- / -10	2	✓ Closing fragment
09-07 20:11	40m	- / -6	PA1L	+2 / -	2	✓ Closing fragment
09-07 20:07	40m	-5 / -4	DF1OY	0 / -10	3	✓ Full exchange observed
09-07 19:56	40m	- / -11	RY4ABB	0 / -	2	✓ Closing fragment
09-07 19:43	40m	+1 / -	G1NZO	- / -4	2	✓ Closing fragment
09-07 19:40	40m	- / -19	F1PBZ	-1 / -	3	Partial capture
09-07 19:33	40m	- / +2	DL2DBI	-13 / -	2	✓ Closing fragment
09-07 19:26	40m	-4 / -	EG3PDA	- / -7	2	✓ Closing fragment
09-07 04:18	40m	0 / -	K0KP	- / -13	2	✓ Closing fragment
09-07 04:15	40m	+5 / -	R6ZAJ	- / -13	3	✓ Closing fragment
09-07 04:12	40m	+4 / -	WD4CNO	- / -8	2	✓ Closing fragment
09-07 04:12	40m	- / -20	F1PBZ	0 / -	2	Partial capture
09-07 04:10	40m	-4 / -	MW0ACX	- / -12	2	✓ Closing fragment
09-07 04:07	40m	+2 / -	LZ3AI	- / -16	2	✓ Closing fragment
09-07 04:02	40m	- / -1	5Q1X	-17 / -	3	✓ Closing fragment
09-06 20:56	40m	-8 / -	EG1PPE	- / -2	2	✓ Closing fragment
09-06 20:54	40m	-3 / +1	SP9CVY	-8 / -	3	✓ Closing observed
09-06 20:53	40m	0 / -	JA5XAE	- / -13	2	✓ Closing fragment
09-06 20:52	40m	+2 / -	JE3GRQ	- / -8	2	✓ Closing fragment
09-06 20:49	40m	-1 / +3	YU7YZ	-1 / -3	2	Partial capture
09-06 20:46	40m	+2 / +1	DH3UN	+3 / -1	7	✓ Full exchange observed
09-06 20:42	40m	-10 / -2	EA8Y	-17 / -3	3	✓ Full exchange observed
09-06 20:41	40m	+5 / -13	RA1TI	+6 / -4	4	✓ Full exchange observed
09-06 20:39	40m	+4 / -14	R3KIZ	-6 / -	3	✓ Closing observed
09-06 20:38	40m	-6 / -	SP9SOS	- / -7	2	✓ Closing fragment
09-06 20:35	40m	+6 / -4	UX1UA	+18 / 0	4	✓ Full exchange observed
09-06 20:33	40m	+3 / -	EA1HWP	- / -17	3	✓ Closing fragment
09-06 20:33	40m	+9 / -14	RA1TI	+4 / -6	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
211645  +0 2057  OZ3AAF IU4DTV -07
211700  +0 2058  IU4DTV OZ3AAF R-09
211715  -2 2057  OZ3AAF IU4DTV RR73
211800  +3 2295  F4HJG IU4DTV -07 (x2)
211900  -4 2156  YL3RK IU4DTV -05
211930  -9 1135  RX3ASQ IU4DTV -04
212000 -14 2157  YL3RK IU4DTV -08
212300  +2  786  IU4DTV SV8/F2VX R-12
212415 -20  837  M8MFU IU4DTV -07
212430  -9  836  IU4DTV M8MFU R-06
212745 -16  539  IU4DTV M9UOK 73
040845 -17 1320  KB9ZM IU4DTV -09
041415 -15 1854  IU4DTV N4QS R-12 (x2)

80m

UTC    dB Audio  Message
205445 -11 1628  IU4DTV LY100RADIO R-02
203915 -16 1082  CQ IU4DTV JN54                        a1 (x2)
204200 -11 2342  IU4DTV F6BHK JN24
035700 -14 1494  IU4DTV HB9EKJ R-13 (x2)
035915 -11 1210  IU4DTV II7MGBA R-12
040245 -13 1407  IU4DTV DO5WG R-11 (x2)
040445  -1 1552  IU4DTV SP5DFK/QRP R-14
040700 -24 1555  CQ IU4DTV JN54                        a1
040830 -24 1024  SV8LMQ IU4DTV -07
040900 -24 1876  DL2DBI IU4DTV -08
040945 -17 1876  IU4DTV DL2DBI 73
041000 -24 1024  SV8LMQ IU4DTV -07

60m

UTC    dB Audio  Message
041745 -18 1952  IU4DTV OH3GBW R-19 (x2)
190930  +4 1379  IU4DTV YO4NT R-18 (x2)
191115  +2 2314  IU4DTV OZ9FF R-10 (x2)
191845  +5 1543  IU4DTV SN31ROT R-13
193230  -2 2584  IU4DTV OM1AGE R-16 (x2)
193545 -18 2184  IU4DTV PC9N R-17
200215  -3 2263  IU4DTV DL6ZAJ JO40 (x5)

20m

UTC    dB Audio  Message
135830 -12  754  CQ IU4DTV JN54 (x3)
140000 -16  754  M6RVA IU4DTV -08
140015 -10  754  IU4DTV M6RVA R-18
142345  +0  825  IU4DTV TA4DX R-17 (x3)
144945  -5 1945  IU4DTV RA9LL 73
145115  +4 2363  IU4DTV M7GJO R-09 (x2)
145245  -1  679  IU4DTV G7TWX R-10 (x2)
150330  -2 2443  IU4DTV EA7R RR73
152445 -10 2356  IU4DTV M7YVZ 73

10m

UTC    dB Audio  Message
194945  -9 2718  IU4DTV PC9K 73
113830 -16 2281  MI0OBC IU4DTV +04
114100  -3 2953  DO1FDK IU4DTV -19
183330  -8 2255  IU4DTV DO1JMS R+12 (x2)
193630 -16 1115  IU4DTV OD5VB 73
201545  -1 2547  IU4DTV PD0HLA R-09 (x2)
204315 -21 1500  PR7KH IU4DTV -09
204345 -22 1427  HA9GKL IU4DTV -09 (x2)
110445  -7  603  IU4DTV SV1CQN R+07
111315 -11 2553  IU4DTV EA3FAJ 73
180100 -11 1908  IU4DTV LZ2II 73
182200 -21 1281  IU4DTV TA1BX R-14

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.

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