JA7JPZ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM98

Receiver-side FT8 activity involving JA7JPZ, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-13 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 JA7JPZ as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (60%), followed by 40 m (40%). In this small sample, the estimated median decoder S/N was -12 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 3 40m · 2

First attributed message: 2026-06-13
Last attributed message: 2026-08-12 20:06 UTC

Observed FT8 message patterns

Attributed sample: 5 messages
Active dates: 2 UTC dates
Estimated median S/N: -12 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 4, 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 JA7JPZ in decoded directed-looking exchanges:

IW4EGP · Italy IZ7NLJ · Italy LY7M · Lithuania OK7PK · Czech Republic R5ZQ · European Russia R9SAP · Asiatic Russia RV3ZK · European Russia RY3K · European Russia SV8DCY · Greece SV8JE · Greece UD8S · Asiatic Russia EU3AA · Belarus

Most frequent locator attributed to JA7JPZ

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: PM98 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,423 km (approx.)
Last such locator decoded: 2026-08-12 20:05 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	JA7JPZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 19:24	160m	- / -14	IW4EGP	+5 / -	2	Partial capture
09-19 19:20	160m	- / -	IW4EGP	+11 / -	3	✓ Closing fragment
09-19 19:18	160m	- / -	RA3ZH	+9 / -	2	Partial capture
09-19 19:17	160m	- / -	R9SAP	-16 / -	2	✓ Closing fragment
09-19 19:16	160m	- / -21	OK7PK	+18 / -	4	✓ Closing fragment
09-19 19:13	160m	- / -	IW4EGP	+8 / -	2	Partial capture
09-19 19:10	160m	- / -19	IZ7NLJ	-6 / -	3	✓ Closing fragment
09-19 19:07	160m	- / -	IW4EGP	+12 / -	4	Partial capture
09-19 19:07	160m	- / -	S57AM	0 / -	2	Partial capture
09-15 20:12	80m	- / -	EA1R	-21 / -	2	Partial capture
09-15 20:11	80m	- / -	IZ8KVW	-9 / -	3	Partial capture
09-09 11:18	20m	- / -13	ON6AA	-16 / -	2	Partial capture
09-02 19:33	160m	- / -	OH2BGD	0 / -	2	Partial capture
09-02 19:18	160m	- / -20	LY7M	+8 / -	2	✓ Closing fragment
08-30 19:56	160m	- / -	RA6YDX	-8 / -	3	Partial capture
08-30 19:54	160m	- / -17	SV8DCY	-7 / -	3	✓ Closing fragment
08-30 19:53	160m	- / -	RM3ZR	+4 / -	7	Partial capture
08-30 19:51	160m	- / -19	RV3ZK	+6 / -	4	✓ Closing fragment
08-30 19:51	160m	- / -9	SV8JE	-1 / -	6	✓ Closing fragment
08-30 19:51	160m	- / -15	RY3K	+18 / -	3	✓ Closing fragment
08-30 19:50	160m	- / -	RA6YDX	-9 / -	7	Partial capture
08-30 19:49	160m	- / -16	R5ZQ	+3 / -	2	✓ Closing fragment
08-30 19:46	160m	- / -7	UD8S	-10 / -	2	✓ Closing fragment
08-30 19:42	160m	- / -	RM3ZR	+10 / -	2	Partial capture
08-22 10:30	10m	- / -15	DN9DSP	-15 / -	5	Partial capture
08-14 21:14	40m	- / -	PD0HLA	-9 / -	2	Partial capture
08-12 20:07	80m	- / -	UR5KC	+15 / -	2	Partial capture
08-12 20:05	80m	-11 / -5	LZ1QV	+10 / -17	5	✓ Full exchange observed
08-12 19:59	80m	- / -7	E74MG	+5 / -	6	Partial capture
08-12 19:59	80m	- / -	9A5E	-1 / -	3	Partial capture
08-12 19:59	80m	- / -16	EU3AA	+8 / -	3	✓ Closing fragment
07-25 08:05	20m	- / -	EA3IE	-10 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
191330  +9 2917  JA7JPZ IW4EGP JN64 (x2)
191600 +15 2533  JA7JPZ OK7PK -21 (x3)
191730 -15  797  JA7JPZ R9SAP RR73
191730 +22 2843  JA7JPZ OK7PK 73
191800  +8 2768  JA7JPZ RA3ZH KO81
191800 -16  797  JA7JPZ R9SAP RR73
192000 +10 2768  JA7JPZ RA3ZH KO81
192000 +11 2712  JA7JPZ IW4EGP RR73 (x5)

80m

UTC    dB Audio  Message
200200 +14 2715  JA7JPZ E74MG -08
200515 -12 2663  LZ1QV JA7JPZ PM98
200600  +8 2856  JA7JPZ LZ1QV -05
200615 -10 2664  LZ1QV JA7JPZ R-17
200630 +13 2857  JA7JPZ LZ1QV RR73
200645 -11 2663  LZ1QV JA7JPZ 73
200730 +14 1234  JA7JPZ UR5KC KO30 (x2)
184830 -13  699  JA7JPZ RW4HB LO53
201145  -4 1976  JA7JPZ LX2A RR73
201145 -10 1531  JA7JPZ IZ8KVW JN71 (x2)
201215 -22  577  JA7JPZ EA1R IN73
201245  -8 1530  JA7JPZ IZ8KVW JN71
201315 -20  577  JA7JPZ EA1R IN73

20m

UTC    dB Audio  Message
080545 -15 2282  JA7JPZ EA3IE JN01 (x2)
111830 -17 1006  JA7JPZ ON6AA JO11 (x2)

10m

UTC    dB Audio  Message
102300 -12 1149  JA7JPZ IT9LKX -14
102900 -17 2121  JA7JPZ II7MGBT -24
103030 -15 1204  JA7JPZ DN9DSP -15 (x5)

40m

UTC    dB Audio  Message
204830  -7  944  JA7JPZ UT5ZC KN57
211400  -8 2450  JA7JPZ PD0HLA JO22 (x2)

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