JN7DOS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: QM08

Receiver-side FT8 activity involving JN7DOS, decoded by SO8OO in southeastern Poland. 7 FT8 messages attributed to this token as transmitter, on 40m, across 1 UTC dates in the available aggregate history. Last observed 2026-09-06.

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 JN7DOS as the transmitting token by decoded message structure across 1 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 -13 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

40m · 7

First attributed message: 2026-09-06
Last attributed message: 2026-09-06 16:53 UTC

Observed FT8 message patterns

Attributed sample: 7 messages
Active dates: 1 UTC dates
Estimated median S/N: -13 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 7, 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 JN7DOS in decoded directed-looking exchanges:

RW9AW · Asiatic Russia R70SAB · European Russia RN3ZBX · European Russia RT1I · European Russia RU8W · Asiatic Russia SP5RZL · Poland SQ7FZR · Poland UR5ZHJ · Ukraine YT6AAA · Serbia

Most frequent locator attributed to JN7DOS

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: QM08 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,525 km (approx.)
Last such locator decoded: 2026-09-06 16:53 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	JN7DOS S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 17:39	40m	- / -8	UT7UJ	+8 / -	2	Partial capture
09-14 17:38	40m	- / -18	UR9QQ	-4 / -	4	Partial capture
09-14 17:36	40m	- / -15	SQ7FZR	-14 / -	2	✓ Closing fragment
09-14 17:28	40m	- / -12	R70SAB	+16 / -	3	✓ Closing fragment
09-06 16:52	40m	-14 / -	RA3ZOM	- / -	2	Partial capture
09-06 16:50	40m	- / -7	RT1I	-10 / -	2	✓ Closing fragment
09-06 16:47	40m	-12 / -	SP5RZL	- / -15	2	✓ Closing fragment
09-06 16:45	40m	-14 / -23	RU8W	-4 / -8	4	✓ Full exchange observed
09-05 16:56	40m	- / -18	OE3KLU	+26 / -	2	Partial capture
09-05 16:54	40m	- / -16	UR5ZHJ	+3 / -	2	✓ Closing fragment
08-30 16:54	80m	- / -16	YO7CFD	+19 / -	3	Partial capture
08-30 16:41	160m	- / -17	RW9AW	-13 / -	5	✓ Closing fragment
07-06 18:41	40m	- / -14	YT6AAA	-11 / -	2	✓ Closing fragment
07-06 18:33	40m	- / -14	RJ6ON	-5 / -	2	Partial capture
07-06 18:28	40m	- / -11	RN3ZBX	-9 / -	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
165000 -10  284  JN7DOS RT1I -07 (x2)
165230 -13  468  RA3ZOM JN7DOS QM08 (x2)
172845 +16 2888  JN7DOS R70SAB -12 (x3)
173615 -14 2034  JN7DOS SQ7FZR -15 (x2)
173815  -8 2234  JN7DOS UR9QQ KN77 (x2)
173915  +4  607  JN7DOS UT7UJ -08
173915  -7 2234  JN7DOS UR9QQ KN77
173945 +11  607  JN7DOS UT7UJ -08
174015  +3 2234  JN7DOS UR9QQ R-18

80m

UTC    dB Audio  Message
165415 +19  773  JN7DOS YO7CFD -16 (x3)

160m

UTC    dB Audio  Message
164100 -14  859  JN7DOS RW9AW MO05 (x5)

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