IZ5SIH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Italy Most frequent locator attributed to this token: JN53

Receiver-side FT8 activity involving IZ5SIH, decoded by SO8OO in southeastern Poland. 1,609 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, 10m, across 33 UTC dates in the available aggregate history. Observed between 2026-06-29 and 2026-09-25.

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 IZ5SIH as the transmitting token by decoded message structure across 33 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (69%), followed by 10 m (18%) and 40 m (12%). Most decodes (76%) fell within the six-hour window 05:00-11:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11.2 dB.

Overview

1,609

Messages attributed

UTC dates decoded

259

Active 15-min windows

-11.2 dB

Estimated median S/N

Bands

60m · 18 40m · 193 20m · 1,111 10m · 287

First attributed message: 2026-06-29
Last attributed message: 2026-09-25 06:40 UTC

Observed FT8 message patterns

Attributed sample: 1,609 messages
Active dates: 33 UTC dates
Estimated median S/N: -11.2 dB
Estimated 10th-90th percentile: -20 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 426, moderate (-15 to -9 dB) 636, strong (≥ -8 dB) 547.

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 IZ5SIH in decoded directed-looking exchanges:

OD5ZZ · Lebanon ×2 5B4ARQ · Cyprus ×2 F1PBZ · France ×2 PD2WL · Netherlands ×2 CS7AZL · Portugal CU3HN · Azores CU6NS · Azores DL8NW · Fed. Rep. of Germany DO3BZ · Fed. Rep. of Germany ES0IA · Estonia EW8DU · Belarus F5RRS · France

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 IZ5SIH

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: JN53 · 750 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,089 km (approx.)
Last such locator decoded: 2026-09-25 06:35 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	IZ5SIH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-25 06:37	60m	-21 / -	G0TSM	- / 0	2	Partial capture
09-25 06:28	60m	-18 / -	DK4RH	-22 / -	2	✓ Closing observed
09-25 06:25	60m	-20 / -	G0BLB	-6 / -3	3	✓ Closing observed
09-25 06:22	60m	-22 / -17	HG8LXL	-2 / -4	7	✓ Full exchange observed
09-25 06:18	60m	-18 / -	ZL2CC	- / -20	2	Partial capture
09-25 06:15	40m	-9 / -	KR4LQH	- / -17	2	Partial capture
09-25 06:14	40m	-6 / -	KA9FOX	- / -15	2	✓ Closing fragment
09-25 06:12	40m	-10 / -	F1PBZ	- / -9	2	✓ Closing fragment
09-25 06:10	40m	-4 / -	WE9G	- / -18	2	✓ Closing fragment
09-25 06:08	40m	-2 / -	LU5ILA	- / -18	2	Partial capture
09-25 06:03	40m	-7 / -	3D2USU	- / -14	3	✓ Closing fragment
09-25 05:54	40m	+2 / -	FK8HC	- / -16	10	✓ Closing fragment
09-25 05:48	40m	-5 / -	FO5QB	- / -17	3	✓ Closing fragment
09-25 05:41	40m	-9 / -	FO5QB	- / -15	3	Partial capture
09-25 05:40	40m	-4 / -	K5VGS	- / -12	2	✓ Closing fragment
09-23 06:24	60m	- / -	DL9KM	-15 / -	2	Partial capture
09-23 06:20	60m	- / -8	DK7ZT	-18 / -	2	✓ Closing fragment
09-23 06:16	60m	-15 / -6	HA7TM	+12 / -	4	✓ Closing observed
09-23 06:15	60m	- / -8	DL3FBI	-10 / -	2	✓ Closing fragment
09-23 06:12	60m	- / -21	DH3KR	-8 / -	3	✓ Closing fragment
09-15 05:55	40m	-2 / -	W4EIS	- / -16	2	Partial capture
09-15 05:47	40m	-4 / -	R1QF/P	- / -8	2	Partial capture
09-11 07:51	40m	-10 / -	HK4EIC	- / -	4	Partial capture
09-07 06:46	40m	+1 / -	ZL1HD	- / -22	4	✓ Closing fragment
09-07 06:43	40m	-1 / -	VE9LS	- / -18	3	✓ Closing fragment
09-07 06:41	40m	+2 / -	KQ4FNU	- / -	2	Partial capture
09-01 05:53	40m	0 / -	WB9YXA	- / -	3	Partial capture
09-01 05:48	40m	-3 / -	J88IH	- / -16	2	✓ Closing fragment
08-31 12:41	20m	+4 / -	N2LQH	- / -11	4	✓ Closing fragment
08-31 10:18	20m	-1 / -	PY8WW	- / -16	4	✓ Closing fragment
08-31 08:08	20m	+3 / -	M7OIK	- / -14	2	✓ Closing fragment
08-31 08:04	20m	0 / -	VK5RJ	- / -7	2	Partial capture
08-31 07:53	20m	-4 / -	YC1SNI	- / -	2	Partial capture
08-31 07:42	20m	-2 / -	VK3TZT	- / -	3	Partial capture
08-31 07:36	20m	-3 / -	UN7IV	- / -16	3	✓ Closing fragment
08-31 07:25	20m	-5 / -	2E0UMF	- / -5	2	✓ Closing fragment
08-31 07:25	20m	-4 / -	TA4SSK	-4 / -2	3	Partial capture
08-31 07:24	20m	-2 / -	F4BYA	- / -7	2	✓ Closing fragment
08-31 07:23	20m	- / -	RZ4FWA	-5 / -	3	Partial capture
08-31 07:23	20m	+5 / -4	TA1MB	+12 / -4	4	✓ Full exchange observed
08-31 07:02	20m	+3 / -	VK3BMA	- / -17	3	✓ Closing fragment
08-31 06:47	20m	-2 / -	VK3BOY	- / -6	3	✓ Closing fragment
08-31 06:44	20m	-3 / -	7X4BL	- / -7	4	✓ Closing fragment
08-20 13:48	20m	-12 / -	TA3NK	-6 / 0	9	Partial capture
08-20 13:47	20m	-5 / +1	PD2WL	-9 / -3	8	✓ Full exchange observed
08-20 13:47	20m	-10 / -	IU5HIU	-7 / -17	5	Partial capture
08-20 13:40	20m	-6 / +1	RU6UR	-9 / 0	8	✓ Full exchange observed
08-20 10:00	20m	+2 / -	<...>	- / -	2	Partial capture
08-20 08:37	20m	-11 / -	RD3FY	-21 / -	2	✓ Closing observed
08-20 08:35	20m	-12 / -	G3EFG	- / -3	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
062345 -24 2109  HG8LXL IZ5SIH RR73
062400  -1 1337  IZ5SIH HG8LXL 73
062500  -6  522  IZ5SIH G0BLB IO81
062545 -20 2109  G0BLB IZ5SIH -03
062630  -6  522  IZ5SIH G0BLB 73
062830 -22 2110  IZ5SIH DK4RH JO31
062915 -18 2109  DK4RH IZ5SIH RR73
063245 -21 2109  EA5RR IZ5SIH -01
063345 -22 2109  F1UFX IZ5SIH R-11
063515 -20 2109  CQ IZ5SIH JN53 (x2)
063700 -22 2109  G0TSM IZ5SIH +00 (x2)
063815 -19 2109  F1IWH IZ5SIH -06
064000 -22 2109  GW4HZA IZ5SIH -07

40m

UTC    dB Audio  Message
060345  -6 2114  3D2USU IZ5SIH -14 (x2)
060800  -4 2115  LU5ILA IZ5SIH -18 (x2)
061045  -4 2114  WE9G IZ5SIH -18 (x2)
061230  +0 2115  IZ5SIH SP7TF -17
061245  -7 2115  F1PBZ IZ5SIH R-09 (x2)
061345  -7 2115  CQ IZ5SIH JN53
061415  -7 2114  KA9FOX IZ5SIH -15 (x2)
061515  -6 2114  CQ IZ5SIH JN53
061545  -9 2115  KR4LQH IZ5SIH -17 (x2)

20m

UTC    dB Audio  Message
081115  +1 2551  W4SWA IZ5SIH JN53
081345 -10 2551  YC1SNI IZ5SIH JN53
101845  -2 2330  PY8WW IZ5SIH JN53 (x4)
105230  -2 2330  K3RH IZ5SIH JN53
105315  -5 2330  HI3QMT IZ5SIH JN53
105430  -8 2330  TA3MPK IZ5SIH JN53
124030  -1 2330  K1NKT IZ5SIH 73
124115  +2 2330  N2LQH IZ5SIH JN53 (x4)
131945  -3  836  VE2FVV IZ5SIH JN53

10m

UTC    dB Audio  Message
091700 -11 2084  YL3ARE IZ5SIH JN53 (x2)
102300 -20 1106  CR7BUJ IZ5SIH R-09
102400 -21 1105  VU2ADV IZ5SIH R-12 (x2)
113445 -10  963  OZ1SMB IZ5SIH R-26 (x2)
114045 -15 1109  ZS6KG IZ5SIH JN53 (x2)
124030 -19 1997  <...> IZ5SIH R-02
124615  -3  713  CQ IZ5SIH JN53
124645  -8  713  UX7QV IZ5SIH -04 (x2)
124745  -6  713  GM3DGD IZ5SIH -11
125145  -5  713  YB1EWD IZ5SIH JN53

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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