IS0JHW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sardinia Most frequent locator attributed to this token: JN40

Receiver-side FT8 activity involving IS0JHW, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 3 UTC dates in the available aggregate history. Observed between 2026-07-16 and 2026-08-12.

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 5 FT8 messages attributed to IS0JHW as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (80%), followed by 10 m (20%). In this small sample, the estimated median decoder S/N was -20 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-20 dB

Estimated median S/N

Bands

20m · 4 10m · 1

First attributed message: 2026-07-16
Last attributed message: 2026-08-12 08:54 UTC

Observed FT8 message patterns

Attributed sample: 5 messages
Active dates: 3 UTC dates
Estimated median S/N: -20 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 0.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with IS0JHW in decoded directed-looking exchanges:

DF6WE · Fed. Rep. of Germany ×2 F4FSY · France ×2 CE2SV · Chile DJ3HW · Fed. Rep. of Germany E70SZ · Bosnia-Herzegovina EC1A · Spain F1TRF · France HB9CNU · Switzerland PD3PAM · Netherlands CR7BRV · Portugal EA3GXK · Spain F1PBZ · France

Most frequent locator attributed to IS0JHW

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: JN40 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,447 km (approx.)
Last such locator decoded: 2026-07-16 11:02 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	IS0JHW S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-16 20:49	40m	- / -24	ON5RZ	-7 / -	7	✓ Closing fragment
08-16 10:56	10m	- / -	F4GYM	-4 / -	2	Partial capture
08-11 20:18	10m	- / -18	CE2SV	-2 / -	4	✓ Closing fragment
08-09 21:34	40m	- / -16	OH0ERF	-12 / -	2	✓ Closing fragment
07-21 20:51	40m	- / -	OZ1CM	-10 / -	2	Partial capture
07-21 19:56	40m	- / -8	DF6WE	-7 / -	3	✓ Closing fragment
07-21 19:54	40m	- / -11	PA3BMB	-10 / -	3	✓ Closing fragment
07-21 19:52	40m	- / -18	OE8DDX	-2 / -	2	Partial capture
07-21 19:46	40m	- / -15	YO4FRF	-7 / -	5	✓ Closing fragment
07-21 19:40	40m	- / -17	YO6QDY	-7 / -	2	✓ Closing fragment
07-21 19:31	40m	- / -18	SP6DT	-9 / -	6	Partial capture
07-21 13:13	10m	- / -14	E70SZ	-4 / -	4	✓ Closing fragment
07-21 11:01	10m	- / +6	HB9CNU	-2 / -	3	✓ Closing fragment
07-20 18:09	10m	- / -	PD3PAM	-20 / -	2	✓ Closing fragment
07-20 09:00	20m	- / -13	YO9PH	-10 / -	2	✓ Closing fragment
07-20 08:54	20m	- / -13	F5RRS	-4 / -	4	✓ Closing fragment
07-19 17:58	40m	- / -11	IT9DVZ	-18 / -	2	Partial capture
07-19 17:43	10m	- / -10	DO5PY	-17 / -	2	Partial capture
07-19 17:43	10m	- / -	EC1A	-18 / -	2	✓ Closing fragment
07-19 09:58	20m	- / -25	S52BT	+6 / -	4	✓ Closing fragment
07-18 19:15	10m	- / +3	DJ3HW	0 / -	5	✓ Closing fragment
07-18 19:14	10m	- / 0	DF6WE	-14 / -	4	✓ Closing fragment
07-18 18:53	40m	- / -8	F4FSY	-23 / -	2	✓ Closing fragment
07-18 18:10	20m	-14 / -	OO0O	- / -	2	✓ Closing fragment
07-18 16:54	10m	- / -	YU1BD	-8 / -	2	Partial capture
07-16 21:42	40m	- / -17	IK5ZPV	-20 / -	2	✓ Closing fragment
07-16 20:51	40m	- / -23	SP0LPR	-11 / -	3	Partial capture
07-16 20:31	20m	- / -14	CR7BRV	-5 / -	3	✓ Closing fragment
07-16 20:28	20m	- / -19	G0ORC	-4 / -	2	✓ Closing fragment
07-16 11:34	20m	- / -18	EB3JT	-11 / -	2	Partial capture
07-16 09:25	10m	- / -16	F4FSY	-13 / -	2	✓ Closing fragment
07-15 06:02	40m	- / -13	PC2J	-12 / -	3	✓ Closing fragment
07-14 07:21	40m	- / -16	SP5HWB	-11 / -	2	Partial capture
07-13 19:09	40m	- / -	DL4MFR	-10 / -	2	Partial capture
06-28 18:34	40m	- / -14	IQ4JO	-4 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
204745 -10 1033  IS0JHW DL1IP JN49
205145 -11 1033  IS0JHW OZ1CM JO46 (x2)
171215 -12  731  IS0JHW ON7AN R-12
183530  -7 2618  IS0JHW HG2DX -09
213400 -11 2494  IS0JHW OH0ERF -16 (x2)
204900  -7 2418  IS0JHW ON5RZ JO21 (x7)
184630 -14 2277  IS0JHW EA1KCN R-18

10m

UTC    dB Audio  Message
112200  -9  761  IS0JHW IK1MJK JN35
131300  -8 1059  IS0JHW E70SZ JN84 (x4)
201830  -3 2598  IS0JHW CE2SV FF47 (x4)
085400 -23 1558  SP2LNY IS0JHW -19
152200  -6 1833  IS0JHW DL9RBV JN68
152200  -2  658  IS0JHW DH1GKS JN38
105600  +0  691  IS0JHW F4GYM JN18
105700 -24 1851  IS0JHW RK4F LO23
105700  -8  691  IS0JHW F4GYM JN18

20m

UTC    dB Audio  Message
125145 -19 1049  IS0JHW EA3GXK 73
181030 -13  575  OO0O IS0JHW RR73 (x2)
095800  +7 1563  IS0JHW S52BT JN76 (x4)
085445  -2 1951  IS0JHW F5RRS JN36 (x4)
090045  -8 2019  IS0JHW YO9PH -13 (x2)
090145 -21 1555  IS0JHW IT9SMU JM77
090345  -4 2828  IS0JHW F1PBZ RR73

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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