TF4CU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Iceland Most frequent locator attributed to this token: HP93

Receiver-side FT8 activity involving TF4CU, decoded by SO8OO in southeastern Poland. 190 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, across 14 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-12.

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 190 FT8 messages attributed to TF4CU as the transmitting token by decoded message structure across 14 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (59%), followed by 40 m (40%) and 60 m (1%). Most decodes (61%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

190

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

60m · 1 40m · 76 20m · 113

First attributed message: 2026-06-06
Last attributed message: 2026-09-12 21:44 UTC

Observed FT8 message patterns

Attributed sample: 190 messages
Active dates: 14 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -21 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 35, moderate (-15 to -9 dB) 84, strong (≥ -8 dB) 71.

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 TF4CU in decoded directed-looking exchanges:

EC3A · Spain ×2 9A4ZM · Croatia ×2 CR2WWA · Azores ×2 CR7BRV · Portugal ×2 SN4WWA · Poland ×2 DL1SWB · Fed. Rep. of Germany ×2 G4FHL · England ×2 9A3MA · Croatia DN9ZZ · Fed. Rep. of Germany LX1JH · Luxembourg M0BEW · England PA3GMD · Netherlands

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 TF4CU

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: HP93 · 76 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,936 km (approx.)
Last such locator decoded: 2026-09-11 20:46 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	TF4CU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 20:35	60m	- / -	F5MYK	-15 / -	3	Partial capture
09-15 20:35	60m	- / -13	PA7PYR	-9 / -	3	✓ Closing fragment
09-15 20:34	60m	- / -	DK4RH	-6 / -	2	Partial capture
09-15 20:33	60m	- / -12	PE1MHY	-8 / -	2	✓ Closing fragment
09-15 20:30	60m	- / -7	DK2CC	-11 / -	5	✓ Closing fragment
09-15 20:29	60m	- / -19	YO3APJ	+15 / -	4	✓ Closing fragment
09-15 20:28	60m	- / -	F5MYK	-16 / -	2	Partial capture
09-15 20:28	60m	- / -21	IZ0MIT	+7 / -	5	✓ Closing fragment
09-15 20:28	60m	- / -	SP8DK	-7 / -	3	Partial capture
09-15 20:28	60m	- / -	UR9QQ	-5 / -	3	Partial capture
09-13 18:42	60m	- / -	OZ4VV	+9 / -	3	Partial capture
09-13 18:41	60m	- / -	DK2LO	-4 / -	4	Partial capture
09-12 22:48	40m	- / -4	DL3KBB	+7 / -	3	✓ Closing fragment
09-12 22:40	40m	- / -5	CT2JTN	-6 / -	3	✓ Closing fragment
09-12 22:39	40m	- / -16	II0IHMG	+4 / -	3	Partial capture
09-12 22:33	40m	- / -12	II0IHMG	0 / -	4	Partial capture
09-12 22:10	40m	- / -	DL7ACA	-1 / -	2	Partial capture
09-12 21:55	40m	- / -16	ON9DC	-20 / -	3	Partial capture
09-12 21:55	40m	- / -8	DL3MML	-2 / -	3	✓ Closing fragment
09-12 21:46	40m	- / -	EA5FD	+1 / -	3	Partial capture
09-12 21:45	40m	- / -11	S58N	-5 / -	5	✓ Closing fragment
09-12 21:41	40m	-24 / -9	F1IQH	-6 / -13	4	✓ Full exchange observed
09-12 21:38	40m	- / -14	SM/DB9LG	-5 / -	6	Partial capture
09-12 21:37	40m	- / -16	ON5LC	-10 / -	3	Partial capture
09-12 21:36	40m	- / -10	MW0DNF	0 / -	2	Partial capture
09-12 21:32	40m	- / -18	SM/DB9LG	-4 / -	7	Partial capture
09-12 21:31	40m	- / -	SA6KLO	-1 / -	10	Partial capture
09-12 21:28	40m	- / -13	DK1RWR	-2 / -	3	✓ Closing fragment
09-12 21:24	40m	- / -12	IK6DLK	+3 / -	3	✓ Closing fragment
09-12 21:24	40m	- / -	SA6KLO	-3 / -	5	Partial capture
09-12 21:23	40m	- / -10	PC2J	-2 / -	2	Partial capture
09-12 21:14	40m	- / -	M1EAG	-6 / -	2	Partial capture
09-12 21:13	40m	- / -	F4HAB	-12 / -	3	Partial capture
09-12 21:12	40m	- / -5	DH0GBC	+8 / -	2	Partial capture
09-12 21:11	40m	- / -	IK6DLK	+3 / -	3	Partial capture
09-12 08:30	40m	- / -13	PA2RO	-10 / -	2	✓ Closing fragment
09-12 07:01	40m	- / -	F4EMG	-6 / -	2	Partial capture
09-12 07:00	40m	- / -16	OT7K	+8 / -	2	✓ Closing fragment
09-12 06:52	40m	- / -19	OZ6P	-1 / -	7	Partial capture
09-12 03:04	40m	- / -	UC6D	+12 / -	4	Partial capture
09-12 03:03	40m	- / -	R3KLE	-18 / -	2	Partial capture
09-12 03:02	40m	- / -	RA6ZS	+2 / -	3	Partial capture
09-12 02:59	40m	- / -16	RK4FF	-1 / -	5	✓ Closing fragment
09-12 02:57	40m	- / -	UA4APN	-12 / -	2	Partial capture
09-11 22:09	40m	- / -	EA4CFT	-11 / -	3	Partial capture
09-11 21:01	40m	-8 / 0	HB9CNU	+6 / -	5	✓ Closing observed
09-11 20:58	40m	-11 / -5	DL1SWB	+2 / -11	6	✓ Full exchange observed
09-11 20:55	40m	- / -14	EC3A	-6 / -	2	✓ Closing fragment
09-11 20:55	40m	- / -	OE7FWJ	-4 / -	6	Partial capture
09-11 20:48	40m	- / -11	DH0GBC	+2 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
203145 -11 1369  TF4CU DK2CC JO63 (x3)
203315  -7  824  TF4CU PE1MHY -12
203315 -16 2236  TF4CU F5MYK IN97
203345 -10  824  TF4CU PE1MHY RR73
203415  -9 1954  TF4CU ES2MC KO29
203445  -3  469  TF4CU DK4RH JO31 (x2)
203545  -9 1089  TF4CU PA7PYR JO21
203545 -14 2236  TF4CU F5MYK IN97
203615  -7 1089  TF4CU PA7PYR R-13 (x2)
203645 -16 2237  TF4CU F5MYK IN97 (x2)

40m

UTC    dB Audio  Message
221030  -2 1534  TF4CU DL7ACA JO40 (x2)
223300  -2 1071  TF4CU II0IHMG -12 (x7)
224000  -4 1505  TF4CU CT2JTN R-05 (x3)
224800  +8  492  TF4CU DL3KBB JO30 (x3)

20m

UTC    dB Audio  Message
184215  +7 1916  TF4CU GM4CXM IO75
185330  -7 1575  TF4CU <...> -16
181915  +7 1536  TF4CU IR7MGGC +03 (x3)
213345  -6 2182  TF4CU G1CEC IO83 (x6)
185245 -15  977  TF4CU JE1FQV -16
190330 +10 1189  TF4CU EA1/PE5X -14 (x2)
193400  -8 1349  TF4CU <...> -14

80m

UTC    dB Audio  Message
223700 -15 1208  TF4CU TF4M RR73

10m

UTC    dB Audio  Message
201030  -7 1439  TF4CU 9A3MA -12 (x4)
201100 -15 1771  TF4CU HI7WWA -08
162300  -9  671  TF4CU LX1JH JN39 (x4)
164115 -11  629  TF4CU DN9RL JO61
164415 -17 1467  TF4CU R6OP KN88
185700  -9 1104  TF4CU ON7VZ -10
185630 -11 1171  TF4CU PA3GMD JO21 (x3)

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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