SV1JSM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Greece Most frequent locator attributed to this token: KM17

Receiver-side FT8 activity involving SV1JSM, decoded by SO8OO in southeastern Poland. 448 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 23 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-07-21.

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 448 FT8 messages attributed to SV1JSM as the transmitting token by decoded message structure across 23 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (51%), followed by 40 m (32%) and 80 m (8%). Most decodes (88%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

448

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

160m · 4 80m · 37 60m · 9 40m · 142 20m · 229 10m · 27

First attributed message: 2026-06-11
Last attributed message: 2026-07-21 17:24 UTC

Observed FT8 message patterns

Attributed sample: 448 messages
Active dates: 23 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -19 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 99, moderate (-15 to -9 dB) 187, strong (≥ -8 dB) 162.

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 SV1JSM in decoded directed-looking exchanges:

BI4KYT · China TA6U · Asiatic Turkey YO2OXD · Romania 5B4ALJ · Cyprus 5B4ARQ · Cyprus 7K1CPT · Japan F4HSB · France F4LHE · France F5SFT · France JY5IB · Jordan LY1DY · Lithuania MI0FBI · Northern Ireland

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 SV1JSM

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: KM17 · 269 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,386 km (approx.)
Last such locator decoded: 2026-07-21 17:22 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	SV1JSM S/N	Counterpart	Counterpart S/N	Msgs	Capture
07-21 17:21	20m	-6 / -	TA2ED	- / -5	4	✓ Closing fragment
07-21 17:18	20m	-14 / -	JA5NSR	- / -	2	Partial capture
07-21 17:17	20m	-9 / +1	TA1BJ	-8 / -	2	Partial capture
07-21 16:56	10m	- / +1	TA6U	-18 / -	2	✓ Closing fragment
07-20 14:52	20m	- / +2	5B4ALJ	+4 / -	2	✓ Closing fragment
07-19 15:33	20m	- / -	F5SFT	-10 / -	2	✓ Closing fragment
07-18 17:33	20m	- / -	R6LQU	-12 / -	3	Partial capture
07-18 17:30	20m	- / -17	MI0JZZ	-11 / -	3	✓ Closing fragment
07-17 06:26	20m	- / -	DL1R	-6 / -	2	Partial capture
07-17 06:23	20m	- / -16	IK4TVP	-8 / -	5	Partial capture
07-15 15:29	40m	- / -14	RN6HK	-18 / -	2	✓ Closing fragment
07-14 18:09	40m	-13 / +2	YO9PH	-17 / -	2	Partial capture
07-14 18:00	40m	- / -15	LY4AB	-24 / -	3	✓ Closing fragment
07-09 15:22	20m	- / -16	RL3K	-20 / -	4	Partial capture
07-09 15:18	20m	-10 / -	YH2AZ	- / -13	4	Partial capture
07-09 15:16	20m	- / -	RZ4FWA	-4 / -	4	Partial capture
07-09 15:14	20m	-12 / -	5B4ALJ	- / -	2	Partial capture
07-09 15:12	20m	-15 / -	7K1CPT	- / -6	2	✓ Closing fragment
07-07 15:40	40m	- / -6	DH9DR	-10 / -	2	Partial capture
07-07 15:11	40m	- / +4	9A1BTU	-16 / -	2	✓ Closing fragment
07-06 18:11	40m	-10 / -4	UA3ZQN	-8 / -	5	✓ Closing observed
07-06 18:10	40m	-14 / -	G6LTT	- / -	2	Partial capture
07-06 18:07	40m	-19 / -	VJ6X	- / -	3	Partial capture
07-06 18:06	40m	-12 / -	TA1APU	- / -	2	Partial capture
07-06 18:01	40m	-10 / -	E70SZ	- / -	5	Partial capture
07-06 17:58	40m	-12 / -	LZ2RR	-10 / -5	4	Partial capture
07-06 17:56	40m	-15 / +10	LZ3HG	-14 / -10	8	✓ Full exchange observed
07-06 17:51	40m	-12 / -	VJ6X	- / -	4	Partial capture
07-06 17:40	40m	-14 / -	VJ6X	- / -	11	Partial capture
07-04 15:57	40m	- / -	S57XX	+6 / -	2	✓ Closing fragment
07-04 15:31	20m	- / -4	GB2WWA	-19 / -	2	Partial capture
07-03 20:34	80m	-4 / +7	IR0WWA	-12 / -	5	✓ Closing observed
07-03 20:33	80m	- / -12	MM0HVU	-16 / -	2	Partial capture
07-03 20:32	80m	-8 / -6	HB9EFK	+4 / -12	5	✓ Full exchange observed
07-03 20:15	20m	-14 / 0	F4HSB	-16 / -5	4	✓ Full exchange observed
07-03 20:15	20m	- / -	G4DBW	-6 / -	2	Partial capture
07-03 20:12	20m	-15 / +8	CR2WWA	-12 / -	3	Partial capture
07-03 20:08	20m	-12 / -	EA1AA	- / -	3	Partial capture
07-03 19:58	40m	-12 / +6	9A7Y	-13 / -2	5	✓ Full exchange observed
07-03 19:54	40m	-10 / -	F5OZC	- / -5	4	✓ Closing fragment
07-03 19:48	80m	-7 / -8	RA6FYL	-6 / -14	6	✓ Full exchange observed
07-03 19:47	80m	-8 / -	E70SZ	- / -	3	Partial capture
07-03 19:44	80m	-9 / -	SN4WWA	+6 / -11	6	✓ Closing observed
07-03 19:42	80m	-3 / -1	YO4BEW	-15 / -18	5	✓ Full exchange observed
07-03 16:37	40m	-16 / -	TM2WWA	- / -7	3	Partial capture
07-03 16:29	20m	-8 / -1	RL3T	+8 / +5	4	✓ Full exchange observed
07-03 16:26	20m	-6 / -	BD4WBT	- / -	5	Partial capture
07-03 16:21	20m	-18 / -	OZ9FF	- / -	2	✓ Closing fragment
07-02 17:07	20m	-3 / -	TA7LLL	-10 / -2	3	✓ Closing observed
07-02 17:00	20m	- / +10	R6OP	-3 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
145245  +5 1014  SV1JSM 5B4ALJ RR73
150115 -15 2567  BI4MPH SV1JSM KM17
151700  -4 2505  SV1JSM RW3SK KO94
160315 -12  846  SV1JSM VU3LXI -10
163845 -10 2065  SV1JSM IK4TVP -16
171715  -9 1554  TA1BJ SV1JSM KM17
171845 -16 1553  JA5NSR SV1JSM KM17
171900  -8  914  SV1JSM TA1BJ +01
171915 -13 1553  JA5NSR SV1JSM KM17
172145  -8 1230  TA2ED SV1JSM KM17 (x4)
175530  -9 2493  SV1JSM TF4M -13
175600 -11 2493  SV1JSM RR73; EA6TU <...> -12

10m

UTC    dB Audio  Message
160345 -18 2319  SN1B SV1JSM KM17
165615 -18 1239  SV1JSM TA6U +01 (x2)
170100 -22 1852  BI4KYT SV1JSM 73

40m

UTC    dB Audio  Message
181215  -8 2441  SV1JSM UA3ZQN -04 (x2)
181300  -6 2071  UA3ZQN SV1JSM 73
151145 -15 1442  SV1JSM 9A1BTU +04 (x2)
154030 -10  872  SV1JSM DH9DR -06 (x2)
180045 -24 1633  SV1JSM LY4AB -15 (x3)
180430 -19 1968  SP5ROM SV1JSM KM17
180915 -13 2453  YO9PH SV1JSM KM17
180930 -17 1934  SV1JSM YO9PH +02
152900 -16  996  SV1JSM RN6HK -14 (x2)

80m

UTC    dB Audio  Message
194930  -5 1912  SV1JSM RA6FYL -06
194945 -10 2114  RA6FYL SV1JSM R-14
195030 -10 1912  SV1JSM RA6FYL 73
203200  -8 2004  HB9EFK SV1JSM KM17
203215  +2 2304  SV1JSM HB9EFK -06
203230 -10 2004  HB9EFK SV1JSM R-12
203245  +5 2304  SV1JSM HB9EFK RR73
203300  -7 2004  HB9EFK SV1JSM 73
203315 -23 1699  SV1JSM MM0HVU -12 (x2)
203415  -5 2067  IR0WWA SV1JSM KM17 (x2)
203530 -11  363  SV1JSM IR0WWA +07 (x2)
203615  -5 2067  IR0WWA SV1JSM 73

160m

UTC    dB Audio  Message
211115  +4 1602  SV1JSM YO2OXD -03
211130 -15 1753  YO2OXD SV1JSM R-19
211145  +5 1602  SV1JSM YO2OXD RR73
211200 -16 1753  YO2OXD SV1JSM 73
211430 -17 1753  CQ SV1JSM KM17                        a1 (x2)

60m

UTC    dB Audio  Message
180230 -14 1711  CQ SV1JSM KM17
180245 -22 1737  SV1JSM DL9KM JN68

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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