SX48JM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Greece

Receiver-side FT8 activity involving SX48JM, decoded by SO8OO in southeastern Poland. 1,609 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, across 14 UTC dates in the available aggregate history. Observed between 2026-09-03 and 2026-09-19.

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 1,609 FT8 messages attributed to SX48JM as the transmitting token by decoded message structure across 14 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (93%), followed by 80 m (7%) and 60 m (1%). Most decodes (75%) fell within the six-hour window 18:00-00:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (87%); the estimated median was +0.9 dB.

Overview

1,609

Messages attributed

UTC dates decoded

156

Active 15-min windows

+0.9 dB

Estimated median S/N

Bands

80m · 107 60m · 13 40m · 1,489

First attributed message: 2026-09-03
Last attributed message: 2026-09-19 22:56 UTC

Observed FT8 message patterns

Attributed sample: 1,609 messages
Active dates: 14 UTC dates
Estimated median S/N: +0.9 dB
Estimated 10th-90th percentile: -10 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 56, moderate (-15 to -9 dB) 148, strong (≥ -8 dB) 1,405.

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 SX48JM in decoded directed-looking exchanges:

OZ/KD0NDU · Denmark ×41 R1943OD · European Russia ×19 F5OYA/P · France ×12 TK/4O7CC · Corsica ×12 UB0SMX/P · Asiatic Russia ×12 S79/DL2SBY · Seychelles ×11 R1QF/P · European Russia ×10 R73SLET · European Russia ×9 SO100PKP · Poland ×9 SQ100PKP · Poland ×9 EA5/DL1YTT · Spain ×8 SN40KZE · Poland ×8

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.

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	SX48JM S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 22:40	40m	+1 / -	WB8YJF/NA67	-5 / -	3	✓ Closing observed
09-19 22:33	40m	+5 / -	WB8YJF/NA67	+3 / -	2	✓ Closing observed
09-19 21:50	40m	+3 / -	WB8YJF/NA67	- / -	3	✓ Closing fragment
09-19 21:47	40m	+4 / -	WB8YJF/NA67	- / -	2	✓ Closing fragment
09-18 23:02	40m	- / -	UB3BDJ/6	-12 / -	2	✓ Closing fragment
09-18 20:58	40m	+2 / -	EA5/DL1YTT	- / -	2	✓ Closing fragment
09-18 20:19	40m	+2 / -	EA5/DL1YTT	- / -	2	✓ Closing fragment
09-18 20:12	40m	-2 / -	UB3BDJ/6	- / -	2	✓ Closing fragment
09-18 20:02	40m	-6 / -	EA5/DL1YTT	- / -	2	✓ Closing fragment
09-18 19:54	40m	-11 / -	UB3BDJ/6	+11 / -	3	✓ Closing observed
09-18 19:53	40m	- / -	II4IANT	-14 / -	3	✓ Closing fragment
09-16 21:52	40m	-1 / -	S79/DL2SBY	- / -	3	✓ Closing fragment
09-16 21:49	40m	+4 / -	S79/DL2SBY	0 / -	3	✓ Closing observed
09-16 21:29	40m	-1 / -	S79/DL2SBY	-1 / -	5	✓ Closing observed
09-16 21:26	40m	-2 / -	S79/DL2SBY	- / -	2	✓ Closing fragment
09-16 21:22	40m	-3 / -	S79/DL2SBY	- / -	2	✓ Closing fragment
09-16 21:11	40m	-3 / -	S79/DL2SBY	- / -	2	✓ Closing fragment
09-16 20:49	40m	+2 / -	S79/DL2SBY	-6 / -	3	✓ Closing observed
09-16 20:35	40m	-4 / -	S79/DL2SBY	- / -	2	✓ Closing fragment
09-16 20:27	40m	-1 / -	S79/DL2SBY	- / -	3	✓ Closing fragment
09-15 06:32	40m	-9 / -	TK/4O7CC	- / -	2	✓ Closing fragment
09-15 06:28	40m	-10 / -	TK/4O7CC	-2 / -	3	✓ Closing observed
09-15 05:34	40m	-4 / -	TK/4O7CC	-4 / -	2	✓ Closing observed
09-15 05:24	40m	-6 / -	TK/4O7CC	-6 / -	3	✓ Closing observed
09-15 05:17	40m	-5 / -	SM/DB9LG	+3 / -	4	✓ Closing observed
09-15 05:10	40m	- / -	F5OYA/P	-4 / -	2	✓ Closing fragment
09-15 04:59	40m	-2 / -	SM/DB9LG	- / -	2	✓ Closing fragment
09-15 04:45	40m	-9 / -	F5OYA/P	- / -	2	✓ Closing fragment
09-14 22:09	40m	+3 / -	R1QF/P	-10 / -	2	✓ Closing observed
09-14 21:40	40m	+4 / -	R1QF/P	0 / -	2	✓ Closing observed
09-14 21:34	40m	+1 / -	R1QF/P	- / -	2	✓ Closing fragment
09-14 21:29	40m	+6 / -	R1QF/P	- / -	2	✓ Closing fragment
09-14 21:20	40m	+3 / -	R1QF/P	-2 / -	2	✓ Closing observed
09-14 21:13	40m	-4 / -	R1QF/P	- / -	3	✓ Closing fragment
09-14 21:04	40m	-2 / -	R1QF/P	- / -	3	✓ Closing fragment
09-14 20:57	40m	-8 / -	R1QF/P	- / -	2	✓ Closing fragment
09-13 23:44	80m	-23 / -	SV8/F2VX	+13 / -	4	✓ Closing observed
09-13 23:17	80m	-20 / -	SV8/F2VX	-1 / -	3	✓ Closing observed
09-13 23:00	80m	-15 / -	SV8/F2VX	+15 / -	3	✓ Closing observed
09-13 04:54	40m	-6 / -	SV8/F6BLP	-3 / -	3	✓ Closing observed
09-13 04:46	40m	-2 / -	SV8/F6BLP	-7 / -	3	✓ Closing observed
09-13 01:41	80m	- / -	SN100PKP	-3 / -	2	✓ Closing fragment
09-13 01:19	80m	-15 / -	F5OYA/P	+20 / -	2	✓ Closing observed
09-13 00:57	80m	-17 / -	F5OYA/P	+21 / -	2	✓ Closing observed
09-12 23:31	40m	+5 / -	F5OYA/P	-4 / -	7	✓ Closing observed
09-12 23:20	40m	+7 / -	F5OYA/P	-5 / -	6	✓ Closing observed
09-12 22:54	40m	+5 / -	HF100PKP	- / -	5	✓ Closing fragment
09-12 22:50	40m	+5 / -	HF100PKP	-3 / -	2	✓ Closing observed
09-12 22:43	40m	0 / -	HF100PKP	- / -	2	✓ Closing fragment
09-12 22:36	40m	-6 / -	HF100PKP	- / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
224900  +8  609  WB8YJF/NA67 SX48JM RR73
224930  +4  609  CQ SX48JM (x14)

80m

UTC    dB Audio  Message
235400 -11  577  CQ SX48JM (x8)
000330 -13  577  SN40KZE SX48JM RR73
000645  -5 1142  SX48JM UB3ADO/P 73
000700 -19  577  SN40KZE SX48JM RR73
000715 +15 1328  SX48JM HF100PKP RR73
000730 -17  577  CQ SX48JM
000930 -14  577  SN40KZE SX48JM RR73
001030 -13  577  CQ SX48JM

60m

UTC    dB Audio  Message
212930  -6  515  PH82LIB SX48JM RR73
212945 +20 2816  SX48JM <...> 73
213000  -6  515  CQ SX48JM (x4)
213315 +13  596  SX48JM LA1RAU/P RR73
213330  -5  515  PH82LIB SX48JM RR73
213400  -9  515  CQ SX48JM (x2)
213745  -3  948  SX48JM LA2W/P 73
214315  -7 1605  SX48JM LC2L/P 73
214500  +1  515  CQ SX48JM (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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