SM4KUH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JP70

Receiver-side FT8 activity involving SM4KUH, decoded by SO8OO in southeastern Poland. 44 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-07 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 44 FT8 messages attributed to SM4KUH as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (59%), followed by 20 m (23%) and 40 m (18%). Several six-hour UTC windows tied for the largest share (95%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

80m · 26 40m · 8 20m · 10

First attributed message: 2026-06-07
Last attributed message: 2026-09-12 22:26 UTC

Observed FT8 message patterns

Attributed sample: 44 messages
Active dates: 9 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -22 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 12, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 18.

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 SM4KUH in decoded directed-looking exchanges:

IS0/IK2YCW · Sardinia MM0JTV · Scotland MW3FLI · Wales ON4AOI · Belgium OS4K · Belgium PD1ADA · Netherlands PD1HPB · Netherlands R7OV · European Russia S57FF · Slovenia W3YNI · United States DD7EE · Fed. Rep. of Germany DL5DZL · Fed. Rep. of Germany

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 SM4KUH

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: JP70 · 21 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,249 km (approx.)
Last such locator decoded: 2026-09-12 22:26 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	SM4KUH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-13 09:23	40m	- / -18	DD7EE	-8 / -	2	✓ Closing fragment
08-30 19:16	20m	-9 / -	Z31PM	- / -	2	Partial capture
08-30 19:15	20m	-8 / -	DK8HC	- / -19	3	Partial capture
08-30 13:26	20m	- / -	OE9GWV	+2 / -	4	Partial capture
08-30 13:21	20m	-18 / -13	PD1HPB	-8 / -	11	✓ Closing observed
08-30 13:17	20m	- / -	ON3DAL	0 / -	3	Partial capture
08-30 13:17	20m	- / -2	R7OV	-1 / -	4	✓ Closing fragment
08-30 13:10	20m	- / -	OE9GWV	+6 / -	4	Partial capture
08-21 22:53	20m	-23 / -	W3YNI	- / -16	2	✓ Closing fragment
08-21 22:42	20m	- / -	DG6VC	+1 / -	3	Partial capture
07-30 18:51	40m	- / -	DL6UM	-11 / -	4	Partial capture
07-30 18:47	40m	- / -11	PD9SD	-17 / -	3	Partial capture
07-26 20:39	20m	- / -	PY2GIG	-16 / -	4	Partial capture
07-26 19:58	20m	- / -4	OS4K	-9 / -	3	✓ Closing fragment
07-26 19:57	20m	- / -6	IS0/IK2YCW	-3 / -	4	✓ Closing fragment
07-26 19:52	20m	- / -	DL1R	-4 / -	6	Partial capture
07-26 19:46	20m	- / -6	S57FF	-5 / -	3	✓ Closing fragment
07-25 12:17	20m	- / +4	MM0JTV	-18 / -	2	✓ Closing fragment
07-25 12:14	20m	- / -	PD1ADA	-19 / -	3	✓ Closing fragment
07-23 21:37	40m	-19 / -	VP8VK	- / -	2	✓ Closing fragment
07-22 17:58	20m	- / -	UR4QWW	-10 / -	2	Partial capture
07-16 20:02	80m	-4 / -4	SP9UPH	+17 / -	5	✓ Full exchange observed
07-16 20:01	80m	-5 / -4	UT3UZ	0 / -	5	✓ Full exchange observed
07-16 19:58	80m	-7 / -	M5WJF	- / -14	3	Partial capture
07-16 19:53	80m	-6 / -	DO3JP	- / -9	6	✓ Closing fragment
07-16 19:51	80m	-8 / -11	UA4FKT	+7 / -	5	✓ Full exchange observed
07-16 19:50	80m	-11 / -	OZ1HPS	- / -9	2	✓ Closing fragment
07-16 19:48	80m	-12 / -	JA5MHD	- / -	3	Partial capture
07-16 19:45	80m	-9 / -	ZS6WAB	- / -	5	Partial capture
07-13 06:35	40m	- / -22	SP7TF	-19 / -	3	✓ Closing fragment
07-13 06:08	40m	- / -2	DL5DZL	-8 / -	3	✓ Closing fragment
07-12 20:05	40m	-20 / -7	EA8UP	-14 / -	3	✓ Full exchange observed
07-12 19:57	40m	-15 / 0	HB9EFK	-1 / -	4	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
214030 -22 1442  PA7FB SM4KUH RR73
220900 -12  902  SM4KUH EB9AAI -13
184730 -18 1522  SM4KUH PD9SD JO33 (x3)
185030 -16 2187  SM4KUH F1PBZ -14
185100 -11  629  SM4KUH DL6UM JO60 (x4)
132815  -1  862  SM4KUH SQ2PHC RR73
222615 -19 1439  8P6PD SM4KUH JP70
092330  -7  874  SM4KUH DD7EE -18 (x2)
141945 -14 2435  SM4KUH ES5RY -16

20m

UTC    dB Audio  Message
132330  -7 2163  SM4KUH PD1HPB JO22 (x4)
132545 -18 2164  PD1HPB SM4KUH RR73
132600 -14 2163  SM4KUH PD1HPB 73
132600  +2 2684  SM4KUH OE9GWV JN47 (x4)
191515  -6 2099  DK8HC SM4KUH -19 (x3)
191645 -13 2099  Z31PM SM4KUH JP70 (x2)

80m

UTC    dB Audio  Message
195730  -9 1164  DO3JP SM4KUH JP70
195800  -9 1164  M5WJF SM4KUH JP70 (x2)
195915 -17 2546  SM4KUH OO26TRUDO -15
195930  -6 1164  M5WJF SM4KUH R+01
200130  -8 1164  UT3UZ SM4KUH JP70
200145  +1 1102  SM4KUH UT3UZ -04
200200  -3 1164  UT3UZ SM4KUH R+11
200215  -1 1102  SM4KUH UT3UZ RR73
200230  -5 1164  UT3UZ SM4KUH 73
200245 +16 2246  SM4KUH SP9UPH JO90
200300  -5 1164  SP9UPH SM4KUH +16
200315 +19 2245  SM4KUH SP9UPH R-04
200330  -4 1164  SP9UPH SM4KUH RR73
200345 +16 2245  SM4KUH SP9UPH 73

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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