N4SIM — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: FN31

Receiver-side FT8 activity involving N4SIM, decoded by SO8OO in southeastern Poland. 7 FT8 messages attributed to this token as transmitter, on 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-19 and 2026-09-21.

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 7 FT8 messages attributed to N4SIM as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

40m · 7

First attributed message: 2026-09-19
Last attributed message: 2026-09-21 04:20 UTC

Observed FT8 message patterns

Attributed sample: 7 messages
Active dates: 2 UTC dates
Estimated median S/N: -15 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 5, 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 N4SIM in decoded directed-looking exchanges:

CT2GQA · Portugal ×2 F5LOW · France ×2 F5PBG · France ×2 GJ0KYZ · Jersey ×2 DK1MAX · Fed. Rep. of Germany DL3MIB · Fed. Rep. of Germany EA5RD · Spain ES6DO · Estonia F1MXE · France F4CQS · France F4FCE · France F4FLF · France

Most frequent locator attributed to N4SIM

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: FN31 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 6,913 km (approx.)
Last such locator decoded: 2026-09-21 01:55 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	N4SIM S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-28 07:09	40m	- / -	PD1DBL	-11 / -	5	Partial capture
10-27 06:35	40m	- / -	F8MRQ	-11 / -	5	Partial capture
10-27 04:50	40m	- / -17	F4CQS	-8 / -	5	✓ Closing fragment
10-27 04:15	40m	- / -	M9XPN	-10 / -	4	Partial capture
10-27 02:29	40m	- / -	M9XPN	-14 / -	3	Partial capture
10-27 02:09	40m	- / -	F5MXH	+14 / -	5	Partial capture
10-27 01:49	40m	- / -	EB3JT	+7 / -	4	Partial capture
10-24 05:56	40m	- / -18	S57BTI	+11 / -	3	Partial capture
10-18 03:48	40m	- / -	SV4LGX	-3 / -	5	Partial capture
10-18 01:27	40m	- / -4	G3TKT	-2 / -	7	✓ Closing fragment
10-18 01:25	40m	- / -6	F4FLF	+7 / -	3	✓ Closing fragment
10-18 00:15	40m	- / -	CT2GQA	-11 / -	5	Partial capture
10-17 06:31	40m	- / -20	ES6DO	-14 / -	2	✓ Closing fragment
10-16 04:55	40m	- / -22	HB9IRO	-10 / -	7	Partial capture
10-16 04:09	40m	- / -	IV3GOW	-15 / -	3	Partial capture
10-16 01:58	40m	- / -20	CT2GQA	-10 / -	3	✓ Closing fragment
10-15 01:59	40m	- / -15	HB9TIH	0 / -	3	✓ Closing fragment
10-14 05:09	40m	- / -8	F8MRQ	-11 / -	4	Partial capture
10-14 04:57	40m	- / -	IW9FRA	-20 / -	3	Partial capture
10-14 04:30	40m	- / -17	F5NNN	-8 / -	3	✓ Closing fragment
10-14 03:32	40m	- / -18	F8MRQ	+3 / -	4	Partial capture
10-14 02:51	40m	- / -	F8MRQ	+6 / -	5	Partial capture
10-13 05:15	40m	- / -17	OH5VT	+10 / -	3	Partial capture
10-10 06:20	40m	- / -20	F5OWT	-5 / -	2	Partial capture
10-10 06:06	40m	- / -17	EA6AJW	-21 / -	3	Partial capture
10-10 05:19	40m	- / -	F5MXH	-5 / -	3	Partial capture
10-08 06:46	40m	- / +6	GJ0KYZ	-8 / -	2	✓ Closing fragment
10-08 05:02	40m	- / -	EA3HMM	-4 / -	4	Partial capture
10-08 02:24	40m	- / -	EA3HMM	+5 / -	4	Partial capture
10-08 01:43	40m	- / -	F4FPR	-9 / -	4	Partial capture
10-07 05:06	40m	- / -	IK2JYT	+3 / -	4	Partial capture
10-07 04:38	40m	- / -	IW9FRA	-12 / -	3	Partial capture
10-07 01:48	40m	- / -	LZ2PAJ	-10 / -	2	Partial capture
10-07 01:46	40m	- / -	DK5WL	0 / -	3	Partial capture
10-07 01:23	40m	- / -	DL1OBF	-5 / -	8	Partial capture
10-05 06:11	80m	- / -14	ON7ZJ	+1 / -	3	✓ Closing fragment
10-05 05:55	80m	- / -22	ON8DM	+6 / -	2	Partial capture
10-05 02:06	40m	- / -	IW0RLC	-7 / -	5	Partial capture
10-04 06:47	40m	- / -	PD1AC	-17 / -	2	Partial capture
10-04 04:43	40m	- / -22	EA5RD	-8 / -	2	✓ Closing fragment
10-04 04:37	40m	- / -22	F4FCE	-6 / -	4	✓ Closing fragment
10-04 04:21	40m	- / -	DG4SCG	-10 / -	3	Partial capture
10-04 04:13	80m	- / -6	K4YT	-13 / -	2	✓ Closing fragment
10-04 03:49	40m	- / -	F5OZK	-5 / -	4	Partial capture
10-03 05:47	80m	- / -20	GM6URC	-14 / -	4	Partial capture
10-03 05:26	80m	- / -17	SP1D	+8 / -	3	✓ Closing fragment
10-03 04:00	60m	- / -25	IK4CBO	-3 / -	3	✓ Closing fragment
10-03 03:20	40m	- / -	F5OZK	+4 / -	2	Partial capture
10-03 03:13	60m	- / -24	DD6WF	0 / -	3	✓ Closing fragment
10-03 03:11	60m	- / -12	UT5ECZ	+9 / -	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
045215  -6 2065  N4SIM F4CQS -14 (x2)
063515 -15 2198  N4SIM F8MRQ JN17 (x5)
064445 -19 2197  N4SIM M7MJW JO01
072715 -20 2319  N4SIM G8MIA R-18
051100 -11 1416  N4SIM M9XPN IO91
070945 -16 1584  N4SIM PD1DBL JO22 (x5)

80m

UTC    dB Audio  Message
052630  +9 2089  N4SIM SP1D JO72 (x3)
054715 -17 1694  N4SIM GM6URC -20 (x4)
041345 -12 1100  N4SIM K4YT -06 (x2)
023930 -10  419  N4SIM KF9UG EN71
055530  +5  781  N4SIM ON8DM JO10 (x2)
061100  -1  849  N4SIM ON7ZJ JO21 (x3)

60m

UTC    dB Audio  Message
025230  +6  829  N4SIM F5MXH JN07
030530  -6  776  N4SIM G0AZH IO83 (x4)
031100  +5  828  N4SIM UT5ECZ KN68 (x3)
031300 -12  921  N4SIM MI0NWA IO64
031300  +0  830  N4SIM DD6WF JO62 (x3)
040000  +1 1688  N4SIM IK4CBO JN54 (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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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