SM7TZK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO75

Receiver-side FT8 activity involving SM7TZK, decoded by SO8OO in southeastern Poland. 7,998 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 30 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-09-13.

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 7,998 FT8 messages attributed to SM7TZK as the transmitting token by decoded message structure across 30 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (85%), followed by 40 m (14%) and 20 m (2%). Most decodes (76%) fell within the six-hour window 22:00-04:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (86%); the estimated median was 0 dB.

Overview

7,998

Messages attributed

UTC dates decoded

417

Active 15-min windows

0 dB

Estimated median S/N

Bands

80m · 6,759 40m · 1,111 20m · 121 10m · 7

First attributed message: 2026-06-11
Last attributed message: 2026-09-13 00:40 UTC

Observed FT8 message patterns

Attributed sample: 7,998 messages
Active dates: 30 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -11 to +8.2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 348, moderate (-15 to -9 dB) 786, strong (≥ -8 dB) 6,864.

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 SM7TZK in decoded directed-looking exchanges:

CT2GQA · Portugal ×8 ON1BH · Belgium ×5 RA3WPF · European Russia ×4 TA7ARH · Asiatic Turkey ×4 LA1QRO · Norway ×4 RC9WC · Asiatic Russia ×4 SP3HGD · Poland ×4 DG5PW · Fed. Rep. of Germany ×4 DL9KM · Fed. Rep. of Germany ×3 EA1AIQ · Spain ×3 IZ7NLJ · Italy ×2 UA9CR · Asiatic Russia ×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 SM7TZK

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: JO75 · 6,183 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 769 km (approx.)
Last such locator decoded: 2026-09-13 00:40 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	SM7TZK S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-13 01:54	40m	- / -15	RO6G	-14 / -	2	Partial capture
09-13 01:13	40m	- / -	EA4RKC	-12 / -	2	✓ Closing fragment
09-13 00:58	40m	- / -2	EA3AKY	0 / -	3	✓ Closing fragment
09-13 00:48	40m	- / -	UN8PC	-11 / -	3	Partial capture
09-13 00:40	40m	- / -15	WI1U	-8 / -	2	✓ Closing fragment
09-13 00:30	40m	- / -9	RN6LPC	+4 / -	2	Partial capture
09-13 00:29	40m	-17 / -10	WK1O	-1 / -	7	✓ Closing observed
09-13 00:29	40m	-14 / -	KN4TYK	-13 / -	2	✓ Closing observed
09-13 00:20	40m	-9 / -	VE3JAC	- / -12	3	Partial capture
09-13 00:16	40m	-10 / -	KK2M	-12 / -15	5	Partial capture
09-13 00:02	40m	-12 / -8	W1ATV	-2 / -	5	✓ Closing observed
09-12 23:57	40m	- / -22	NA3US	-20 / -	3	✓ Closing fragment
09-12 23:54	40m	-9 / -	K8JKU	- / -19	2	✓ Closing fragment
09-12 23:51	40m	-20 / -	VE3XN	-15 / -5	2	Partial capture
09-12 23:44	40m	-16 / -	RN6HK	+2 / 0	4	✓ Closing observed
09-12 23:43	40m	-15 / -	IZ1HJU	- / -10	3	✓ Closing fragment
09-12 21:32	40m	0 / -	EU3LA	- / -6	2	✓ Closing fragment
09-12 21:28	40m	-8 / 0	GM3CQD	-12 / -4	4	✓ Full exchange observed
09-12 03:42	40m	- / -13	RZ6ALZ	-14 / -	2	✓ Closing fragment
09-12 03:35	40m	- / -	UB3PAQ	-8 / -	2	✓ Closing fragment
09-12 03:30	40m	- / -10	UA3WG	-7 / -	3	✓ Closing fragment
09-12 02:47	40m	- / -11	W6NWS	+8 / -	2	Partial capture
09-12 02:40	40m	- / -11	R4FDD	0 / -	2	✓ Closing fragment
09-12 02:38	40m	- / 0	R4ML	-7 / -	2	✓ Closing fragment
09-12 02:33	40m	-20 / +6	RK4CH	-8 / -	5	✓ Closing observed
09-12 02:24	40m	-20 / -	YO5IB	- / -	2	✓ Closing fragment
09-12 02:20	40m	-16 / -14	EA2DYB	-4 / +1	8	✓ Full exchange observed
09-12 02:08	40m	-10 / -	KP4LCA	- / -	2	Partial capture
09-12 01:55	40m	-20 / -	M9XPN	- / -15	2	Partial capture
09-12 01:44	40m	- / -14	HI8JCD	-17 / -	3	Partial capture
09-12 01:09	40m	- / -	M9XPN	-4 / -	3	Partial capture
09-12 01:09	40m	- / -	RA6HTU	-14 / -	2	Partial capture
09-12 00:43	40m	-1 / -	YL2KF	- / -	2	✓ Closing fragment
09-12 00:32	40m	-12 / -	N1SK	-18 / -8	6	Partial capture
09-12 00:11	40m	- / -	M9XPN	-8 / -	2	Partial capture
09-12 00:10	40m	-16 / -	RZ1AS	- / -4	3	✓ Closing fragment
09-12 00:05	40m	-15 / -17	KD3DIX	-19 / -17	7	✓ Full exchange observed
09-12 00:02	40m	-4 / -1	F4ACR	+5 / -	4	✓ Closing observed
09-11 23:46	40m	- / -5	AA1SU	-6 / -	2	✓ Closing fragment
09-11 23:36	40m	- / -18	N3XL	-16 / -	8	✓ Closing fragment
09-11 23:16	40m	- / -14	JY5IB	-16 / -	2	✓ Closing fragment
09-11 23:13	40m	- / -	W1FEA	-9 / -	5	Partial capture
09-11 23:09	40m	- / -14	ON1BH	+4 / -	2	✓ Closing fragment
09-11 22:28	40m	- / -	EA1ENG	-10 / -	2	Partial capture
09-11 22:21	40m	-9 / -	G7RCQ	-10 / -	3	✓ Closing observed
09-11 21:59	40m	- / +4	S55OO	-10 / -	2	✓ Closing fragment
09-11 21:55	40m	- / -1	TA7I	-4 / -	3	✓ Closing fragment
09-11 21:49	40m	-7 / -20	PA3CSL	-8 / -11	4	✓ Full exchange observed
09-11 21:46	40m	-10 / -	IW2EPE	- / -25	2	✓ Closing fragment
09-11 21:44	40m	- / -	PA3BBG	-10 / -	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
004815 -11 1122  SM7TZK UN8PC MN69 (x3)
005815  +0 2221  SM7TZK EA3AKY JN01 (x3)
011015 -12  584  SM7TZK K3FAW RR73
011345 -10  902  SM7TZK EA4RKC IM69 (x2)
012515  -5  839  SM7TZK WY5I EL97
013245 -15  837  SM7TZK W4VNE FM04
015415 -13 2303  SM7TZK RO6G -15 (x2)
020945 -11  457  SM7TZK W4VNE FM04 (x2)

160m

UTC    dB Audio  Message
235715 +12 1180  SM7TZK R7DX KN84 (x2)
212415  -3  493  SM7TZK F5RRS JN36 (x4)

80m

UTC    dB Audio  Message
034115 +18  482  SM7TZK YU1AXY -14
034130  +5  482  YU1AXY SM7TZK R-06
034145 +18  482  SM7TZK YU1AXY RR73
034200  +7  482  YU1AXY SM7TZK 73
034230 -19 1748  SN100PKP SM7TZK (x2)
034315  +0 1747  SM7TZK SN100PKP -05
034330  +0 1747  SN100PKP SM7TZK R-15 (x2)
034430 -16 1177  EC5M SM7TZK JO75
034445  -4 1177  SM7TZK EC5M -15
034500  -3 1177  EC5M SM7TZK R-12
034515  -1 1177  SM7TZK EC5M RR73
034530 -10 1178  EC5M SM7TZK 73
034630  -6 2079  HB9NBN SM7TZK JO75

60m

UTC    dB Audio  Message
233245 -15  822  SM7TZK PA0LAN JO21

20m

UTC    dB Audio  Message
065245 -24 2470  SM7TZK EA3HRE 73
065345 +14 2470  SM7TZK F4PCM JN23 (x3)
065645 -17 1546  SM7TZK RC3DN R-04 (x2)
065915  -5 1541  SM7TZK UA3DCG KO95
070215  -4 1055  SM7TZK F1IQH JN27 (x4)
070515  -4 3037  SM7TZK IW5ALZ JN53
160300  -9 1367  CQ SM7TZK JO75 (x2)
160545 -11 2072  SM7TZK R8LCA MO27

10m

UTC    dB Audio  Message
083445  +7 2793  SM7TZK TM2WWA -04
161700 -20 2092  SM7TZK EA8CVR -16 (x2)

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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