JH5AVM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM73

Receiver-side FT8 activity involving JH5AVM, decoded by SO8OO in southeastern Poland. 1,749 FT8 messages attributed to this token as transmitter, on 20m, across 48 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-30.

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 1,749 FT8 messages attributed to JH5AVM as the transmitting token by decoded message structure across 48 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (97%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

1,749

Messages attributed

UTC dates decoded

264

Active 15-min windows

-11 dB

Estimated median S/N

Bands

20m · 1,749

First attributed message: 2026-06-06
Last attributed message: 2026-08-30 18:34 UTC

Observed FT8 message patterns

Attributed sample: 1,749 messages
Active dates: 48 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -22 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 558, moderate (-15 to -9 dB) 584, strong (≥ -8 dB) 607.

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.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JH5AVM in decoded directed-looking exchanges:

IV3DSG · Italy ×4 9K2GR · Kuwait ×3 M8KKH · England ×3 IU3WNU · Italy ×2 LZ2PC · Bulgaria ×2 9A5AZK · Croatia ×2 DM5WGL · Fed. Rep. of Germany ×2 EA1AOC · Spain ×2 SV7JAR · Greece ×2 RA5AK · European Russia ×2 ZL1VAH · New Zealand ×2 R7GA · European Russia ×2

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to JH5AVM

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: PM73 · 795 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,654 km (approx.)
Last such locator decoded: 2026-08-30 18:34 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	JH5AVM S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-06 19:49	40m	- / -	RA3ZUJ	+6 / -	2	Partial capture
09-06 19:39	40m	- / -22	IU2OQT	+1 / -	10	✓ Closing fragment
09-06 19:38	40m	- / -15	R1BNJ	-2 / -	7	✓ Closing fragment
09-06 19:30	40m	- / -16	SY1BKQ	+6 / -	5	✓ Closing fragment
09-06 19:28	40m	- / -	S51UN	-6 / -	2	Partial capture
09-06 19:28	40m	- / -16	R4FV	+9 / -	3	Partial capture
08-31 18:42	20m	- / -20	MM0JTV	-4 / -	4	Partial capture
08-31 18:38	20m	- / -20	MM0JTV	-3 / -	3	Partial capture
08-31 18:34	20m	- / -	MM0JTV	0 / -	4	Partial capture
08-30 19:15	20m	- / -	IK2WRI	+2 / -	2	Partial capture
08-30 19:02	20m	- / -14	IT9MRM	-6 / -	3	Partial capture
08-30 18:48	20m	- / -20	EA3EQS	+7 / -	5	✓ Closing fragment
08-30 18:48	20m	- / -	EA4QE	-8 / -	2	Partial capture
08-30 18:44	20m	- / -25	DC5BO	-9 / -	3	✓ Closing fragment
08-30 18:36	20m	- / -	IU0AFP	-14 / -	2	Partial capture
08-30 18:32	20m	- / -1	OZ1PFH	-12 / -	2	Partial capture
08-30 18:26	20m	- / -15	PD1AR	-10 / -	3	Partial capture
08-30 18:15	20m	- / +10	TA4DX	0 / -	3	✓ Closing fragment
08-30 13:31	20m	- / +1	SG3A	+3 / -	3	✓ Closing fragment
08-30 13:29	20m	- / -	IV3NEP	+3 / -	3	Partial capture
08-30 13:26	20m	- / -13	G4UJS	+5 / -	2	✓ Closing fragment
08-30 13:20	20m	-24 / -	BH8BMZ	- / -11	2	Partial capture
08-30 13:06	20m	-24 / -	YB8SFE	- / -	4	Partial capture
08-30 12:54	20m	-23 / -7	A41KB	-12 / -	8	Partial capture
08-29 07:55	20m	- / -	EA1CCM	-8 / -	2	Partial capture
08-29 06:35	20m	- / -14	IZ0MIO	-12 / -	7	✓ Closing fragment
08-29 06:28	20m	- / -	IZ0MIO	-10 / -	2	Partial capture
08-29 06:08	20m	- / -	OZ6G	+3 / -	3	Partial capture
08-28 20:49	20m	- / -	DG5PW	-8 / -	5	Partial capture
08-28 20:39	20m	- / +4	F4JZW	+16 / -	2	Partial capture
08-28 19:44	20m	- / -14	TA2ED	-6 / -	4	Partial capture
08-28 19:26	20m	- / -	YT7TZ	0 / -	2	Partial capture
08-28 19:07	20m	-20 / -	BA7LUO	- / -9	3	Partial capture
08-28 19:07	20m	- / -	EA2EI/P	-2 / -	2	Partial capture
08-28 19:04	20m	- / -6	R7RAG	-15 / -	2	✓ Closing fragment
08-28 18:38	20m	-11 / -	DL1AMH	- / -7	2	Partial capture
08-28 18:14	20m	- / -24	M8KKH	+4 / -	5	✓ Closing fragment
08-28 18:06	20m	-16 / -	IK0XBU/P	- / -20	7	Partial capture
08-28 17:39	20m	- / -22	RG6S	-9 / -	4	✓ Closing fragment
08-28 17:35	20m	-22 / -	RI1FJL	- / -	2	Partial capture
08-28 17:26	20m	-16 / -	7X2KF	- / -	2	Partial capture
08-28 17:07	20m	- / -	IU6WSB	-14 / -	2	Partial capture
08-28 17:01	20m	-23 / -	OK2MKJ	- / -7	3	Partial capture
08-28 16:48	20m	- / -10	RA3XFR	+2 / -	2	✓ Closing fragment
08-27 21:41	20m	-11 / +3	DL1GAJ	0 / +1	4	✓ Full exchange observed
08-27 21:35	20m	- / -	G4KVI	-12 / -	4	Partial capture
08-27 21:34	20m	-18 / -	PD2LM	- / -17	8	✓ Closing fragment
08-27 21:26	20m	-17 / -	RI1FJL	- / -	3	Partial capture
08-27 21:19	20m	- / -8	9K2GR	-15 / -	3	✓ Closing fragment
08-27 21:15	20m	- / -	5Z4VJ	-3 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
193930  -2 2061  JH5AVM R1BNJ KO59
194000  +3  822  JH5AVM IU2OQT JN45
194000  -2 2061  JH5AVM R1BNJ R-15
194030  -5  823  JH5AVM IU2OQT JN45
194030  -4 2061  JH5AVM R1BNJ R-14
194100  -2  822  JH5AVM IU2OQT JN45
194100  -5 2061  JH5AVM R1BNJ 73
194130  -1  798  JH5AVM IU2OQT JN45
194130  -5 2061  JH5AVM R1BNJ 73
194200  +8  799  JH5AVM IU2OQT JN45 (x4)
194930  +8 1306  JH5AVM RA3ZUJ KO80 (x2)

20m

UTC    dB Audio  Message
190500  -7 1601  JH5AVM IT9MRM R-14
191530  -1 1019  JH5AVM IK2WRI JN45 (x2)
183430  -1 1966  JH5AVM MM0JTV IO75 (x11)
190200  -4 1880  JH5AVM M7SZB -20

10m

UTC    dB Audio  Message
103800  -4 1610  JH5AVM LX1NO JN39 (x3)

80m

UTC    dB Audio  Message
174300 -20 1362  JH5AVM OZ1EDR JO65 (x6)
191630 -24 1539  JH5AVM PA0MUS JO22
164730 -14 1362  JH5AVM OZ1EDR JO65
182900  -7 1874  JH5AVM UT3XM -20 (x7)

160m

UTC    dB Audio  Message
213830 -15 1422  JH5AVM S50PV JN76 (x2)

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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