SM4GMS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO79

Receiver-side FT8 activity involving SM4GMS, decoded by SO8OO in southeastern Poland. 145 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 21 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-28.

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 145 FT8 messages attributed to SM4GMS as the transmitting token by decoded message structure across 21 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (81%), followed by 10 m (19%). The busiest six-hour window was 08:00-14:00 UTC, containing 45% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

145

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

20m · 117 10m · 28

First attributed message: 2026-06-06
Last attributed message: 2026-08-28 09:18 UTC

Observed FT8 message patterns

Attributed sample: 145 messages
Active dates: 21 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -21 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 40, moderate (-15 to -9 dB) 61, strong (≥ -8 dB) 44.

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 SM4GMS in decoded directed-looking exchanges:

EA8UP · Canary Islands ×3 K2TQC · United States ×3 AA3B · United States CR7BRV · Portugal CT7AXN · Portugal DL1BBO · Fed. Rep. of Germany EA8AT · Canary Islands F4HSB · France GM3JIM · Scotland GW0ARK · Wales JG3LGD · Japan K2HJB · United States

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 SM4GMS

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: JO79 · 75 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,148 km (approx.)
Last such locator decoded: 2026-08-28 09:17 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	SM4GMS S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 22:16	20m	- / -16	AA3B	+16 / -	3	✓ Closing fragment
08-28 09:17	20m	+11 / -	KH6DC	- / -1	3	✓ Closing fragment
08-27 19:52	20m	- / -3	ON1JP	-5 / -	5	Partial capture
08-27 19:50	20m	-14 / -7	JG3LGD	-16 / -	3	✓ Closing observed
08-26 07:44	20m	-11 / -	KO6BPG	- / -	3	Partial capture
08-25 21:54	20m	- / -24	KC4DPT	-10 / -	2	✓ Closing fragment
08-25 21:52	20m	- / -16	KS1WK	-12 / -	3	✓ Closing fragment
08-24 22:17	20m	-15 / -7	K2TQC	-1 / -	4	✓ Closing observed
08-24 22:04	20m	-16 / -	K5MGY	- / -	2	Partial capture
08-24 22:00	20m	-12 / -	K2HJB	-2 / +6	5	✓ Closing observed
08-24 15:02	20m	-12 / -	K9RBH	- / -	2	Partial capture
08-20 07:53	20m	- / -3	T77RN	+6 / -	4	✓ Closing fragment
08-17 12:54	20m	-22 / -	N5DRW	- / -	2	Partial capture
08-17 12:47	20m	-21 / -	KI6DY	- / +2	6	Partial capture
08-02 05:56	20m	- / -6	R2AL	-2 / -	5	Partial capture
08-01 21:24	20m	- / -18	K2TQC	-2 / -	2	✓ Closing fragment
07-30 05:51	20m	- / -13	KH6M	-14 / -	2	✓ Closing fragment
07-29 15:41	20m	- / -5	R4FDW	-15 / -	7	Partial capture
07-25 19:15	20m	- / -	UN7GBX	-8 / -	3	Partial capture
07-25 19:11	20m	- / -9	GW0ARK	0 / -	6	✓ Closing fragment
07-25 19:05	20m	- / -9	S51CC	-14 / -	2	✓ Closing fragment
07-25 18:59	20m	- / -8	CR7BRV	+2 / -	2	✓ Closing fragment
07-25 18:57	20m	- / -13	CT7AXN	-14 / -	2	✓ Closing fragment
07-25 18:52	20m	- / +8	GM3JIM	-10 / -	2	✓ Closing fragment
07-24 21:19	20m	- / -	EB3JT	+11 / -	7	Partial capture
07-24 21:03	20m	- / +4	EA8UP	0 / -	2	✓ Closing fragment
07-24 20:57	20m	- / -15	EA8AT	-12 / -	2	✓ Closing fragment
07-23 22:01	20m	- / -11	EA5ISM	-14 / -	2	Partial capture
07-20 21:00	20m	- / -12	K2TQC	-8 / -	2	✓ Closing fragment
07-12 12:35	20m	- / -	RL3K	-5 / -	3	Partial capture
07-10 18:37	20m	-15 / -	TF3IG	- / -	2	Partial capture
06-30 08:20	20m	-11 / -	N9W	-6 / -	4	✓ Closing observed
06-30 06:48	20m	-24 / -	W6ACT	- / -	2	Partial capture
06-27 20:47	10m	- / -9	EA8UP	-16 / -	2	✓ Closing fragment
06-27 20:41	20m	-15 / -	YT1UBN	- / -	4	Partial capture
06-27 20:38	20m	-22 / -	TN8GD	- / -	3	Partial capture
06-27 18:55	20m	-22 / -	7Z1BH	- / +2	2	Partial capture
06-27 12:16	20m	-10 / -	4X1UF	- / -	2	Partial capture
06-25 21:18	20m	- / -9	LU8EKC	-18 / -	2	✓ Closing fragment
06-24 08:02	20m	-6 / -	DL1BBO	- / -	2	✓ Closing fragment
06-24 07:58	20m	-14 / -	TN8GD	- / -19	3	Partial capture
06-23 21:58	20m	- / -	EA8UP	-1 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
195115 -16 2927  SM4GMS JG3LGD -07
195200 -14 2926  JG3LGD SM4GMS 73
195215  -5 1619  SM4GMS ON1JP -03 (x5)
091715  +6 2921  KH6DC SM4GMS JO79 (x3)
113330  -4 2954  SM4GMS N2BJ +00
113400  -3 2955  SM4GMS RR73; BD4QDP <...> -06
221600 +18  655  SM4GMS AA3B -16 (x3)

10m

UTC    dB Audio  Message
204700 -17 1778  SM4GMS EA8UP -09 (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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