JH3GCN — 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: Japan Most frequent locator attributed to this token: PM74

Receiver-side FT8 activity involving JH3GCN, decoded by SO8OO in southeastern Poland. 14 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-11-05.

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 14 FT8 messages attributed to JH3GCN as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (79%), followed by 80 m (21%). In this small sample, the estimated median decoder S/N was -11 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

80m · 3 20m · 11

First attributed message: 2026-06-06
Last attributed message: 2026-11-05 15:19 UTC

Observed FT8 message patterns

Attributed sample: 14 messages
Active dates: 5 UTC dates
Estimated median S/N: -11 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 4, strong (≥ -8 dB) 5.

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 JH3GCN in decoded directed-looking exchanges:

DK5WL · Fed. Rep. of Germany EW2GI · Belarus IW0BSQ · Italy LY2SA · Lithuania R3RB · European Russia RC9WC · Asiatic Russia RY3D · European Russia SQ8N · Poland

Most frequent locator attributed to JH3GCN

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: PM74 · 10 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-11-05 15:19 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	JH3GCN S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-05 15:29	80m	- / -20	SV8CKM	-7 / -	3	Partial capture
11-05 15:23	80m	- / -18	SQ8N	+13 / -	3	✓ Closing fragment
11-05 15:16	80m	-18 / -	SQ8N	- / -	3	Partial capture
11-04 21:06	40m	- / -14	EA3EDU	-2 / -	8	Partial capture
10-20 13:47	40m	- / -3	LY2SA	+15 / -	2	✓ Closing fragment
10-07 15:48	40m	- / -15	DK5WL	+4 / -	6	✓ Closing fragment
10-04 15:45	40m	- / -	UW5ESX	-9 / -	10	Partial capture
10-04 15:31	40m	- / -	SV7BVM	-6 / -	7	Partial capture
09-17 15:20	80m	- / -	UX1AA	-6 / -	2	Partial capture
09-08 15:41	40m	- / -11	R3RB	-14 / -	3	✓ Closing fragment
09-08 15:40	40m	- / -9	RC9WC	-2 / -	2	✓ Closing fragment
09-08 15:34	80m	- / -	UA4FKT	-7 / -	3	Partial capture
09-05 15:35	80m	- / -	RX6DA	-14 / -	2	Partial capture
09-03 15:47	80m	- / -13	RY3D	0 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
153600 -12 1784  JH3GCN RX6DA KN85
153430  -8 1007  JH3GCN UA4FKT LO23 (x3)
152030  -7 1888  JH3GCN UX1AA KO70 (x2)
151645 -21 1151  SQ8N JH3GCN PM74 (x3)
152330 +14  686  JH3GCN SQ8N -18 (x3)
152900 -16  295  JH3GCN SV8CKM -20 (x3)

40m

UTC    dB Audio  Message
155115  +5 1441  JH3GCN DK5WL R-15 (x3)
134745 +14 2733  JH3GCN LY2SA -03 (x2)
205830  -8  590  JH3GCN ZL1RPC/F -12
210630  +1 1804  JH3GCN EA3EDU JN01 (x5)
210900 -13 1360  JH3GCN IW0BSQ RR73
210900  -1 1804  JH3GCN EA3EDU JN01 (x3)

CW

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

Explore CW reception at SO8OO

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee