GM4VAC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Scotland Most frequent locator attributed to this token: IO77

Receiver-side FT8 activity involving GM4VAC, decoded by SO8OO in southeastern Poland. 454 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 12 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-08-28.

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 454 FT8 messages attributed to GM4VAC as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (52%), followed by 40 m (47%) and 80 m (1%). Most decodes (68%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

454

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

80m · 3 40m · 213 20m · 238

First attributed message: 2026-06-12
Last attributed message: 2026-08-28 22:10 UTC

Observed FT8 message patterns

Attributed sample: 454 messages
Active dates: 12 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -18 to +2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 87, moderate (-15 to -9 dB) 146, strong (≥ -8 dB) 221.

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 GM4VAC in decoded directed-looking exchanges:

F1PBZ · France ×3 DL9KM · Fed. Rep. of Germany ×2 E70SZ · Bosnia-Herzegovina ×2 F1IQH · France ×2 IW5ALZ · Italy ×2 AE6CH · United States AH6U · Hawaii BD6KDP · China BG5JGG · China CR2WWA · Azores DL1MST · Fed. Rep. of Germany DL1TKL · Fed. Rep. of Germany

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 GM4VAC

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: IO77 · 191 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,936 km (approx.)
Last such locator decoded: 2026-08-24 06:56 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	GM4VAC S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 22:08	40m	-8 / -	LU8HH	- / -13	5	Partial capture
08-28 22:04	40m	0 / -17	UA9CR	+2 / +3	4	✓ Full exchange observed
08-28 22:01	40m	-3 / -15	TA7ARH	+7 / -	8	✓ Closing observed
08-28 21:56	40m	-10 / -	RA9ACA	-7 / -2	3	✓ Closing observed
08-28 21:44	40m	-10 / -	PY5UD	- / -16	5	Partial capture
08-28 20:44	40m	-3 / -	EA8BBJ	- / -19	3	Partial capture
08-28 19:40	40m	-8 / -	EA8CZL	- / -12	2	✓ Closing fragment
08-28 19:38	40m	- / -11	GJ0KYZ	-6 / -	3	✓ Closing fragment
08-28 19:37	40m	- / -3	SP9LOP	-10 / -	2	Partial capture
08-28 19:35	40m	-10 / -18	4X5JK	-15 / -	2	✓ Closing observed
08-28 19:33	40m	- / -5	PA2WDR	-7 / -	3	✓ Closing fragment
08-28 19:31	40m	- / -18	4X5JK	-17 / -	3	Partial capture
08-28 19:17	40m	-14 / -	EA8NL	- / -17	3	✓ Closing fragment
08-28 19:07	40m	-8 / -	F4MTT	- / 0	2	✓ Closing fragment
08-28 19:04	40m	-8 / -	TA3GO	- / 0	4	✓ Closing fragment
08-28 19:02	40m	-6 / -	UN7PPV	- / -14	2	Partial capture
08-28 18:54	40m	-17 / -15	RM8L	-6 / +2	5	✓ Full exchange observed
08-24 07:10	20m	- / -7	HB9EXE	-12 / -	2	Partial capture
08-24 06:56	20m	- / -6	E70SZ	+10 / -	5	✓ Closing fragment
08-24 06:55	20m	- / +5	IW5ALZ	-10 / -	2	Partial capture
08-24 06:51	20m	- / -	E70SZ	+4 / -	2	Partial capture
08-24 06:50	20m	-14 / -	F5PZQ	- / -13	2	✓ Closing fragment
08-24 06:47	20m	-5 / -	EA4ITG	- / -3	2	✓ Closing fragment
08-24 06:47	20m	-13 / +1	IW5ALZ	-5 / -9	11	✓ Full exchange observed
08-24 06:46	20m	0 / -	PD9FLX	+5 / -13	3	✓ Closing observed
08-24 06:43	20m	+3 / -	VK7ZIP	- / -18	3	✓ Closing fragment
08-24 06:42	20m	-2 / -	YO2CPS	- / -5	2	✓ Closing fragment
08-24 06:41	20m	+2 / -	YO6BLM	- / -7	2	✓ Closing fragment
08-24 06:41	20m	- / -	DL2JB	+7 / -	4	Partial capture
08-24 06:40	20m	+4 / -	DL9KM	- / -12	2	✓ Closing fragment
08-24 06:35	20m	+6 / -	AE6CH	- / -13	2	✓ Closing fragment
08-24 06:34	20m	+5 / +5	EA3CUU	+3 / -5	5	✓ Full exchange observed
08-24 06:32	20m	+2 / -1	F1PBZ	-5 / -7	4	✓ Full exchange observed
08-24 06:30	20m	-6 / -	K7YXZ	- / -19	3	✓ Closing fragment
08-24 06:25	20m	+2 / -	EA3RO	- / -15	2	✓ Closing fragment
08-24 06:24	20m	+2 / -	EA4HBW	- / -5	2	✓ Closing fragment
08-24 06:21	20m	-5 / -	VK4OOO	- / -16	5	Partial capture
08-24 06:20	20m	+3 / -2	VK3TZT	-7 / -6	5	✓ Full exchange observed
08-24 06:18	20m	-1 / -	YO9PH	- / -10	2	✓ Closing fragment
08-24 06:16	20m	+4 / -	W6IWW	- / +2	3	✓ Closing fragment
08-24 06:15	20m	+12 / -	VK5JK	- / -20	2	✓ Closing fragment
08-24 06:12	20m	0 / -	AH6U	- / -14	2	✓ Closing fragment
08-24 06:09	20m	+4 / -2	F4LZZ	-20 / -14	6	✓ Full exchange observed
08-21 20:39	20m	-11 / -	KQ4MHD	- / -17	3	Partial capture
08-21 20:37	20m	- / -	YT1KN	-7 / -	2	Partial capture
08-21 20:37	20m	-11 / -	UR4UVT	- / -11	3	✓ Closing fragment
08-21 20:34	20m	+3 / -11	K2TQC	-13 / +5	5	✓ Full exchange observed
08-21 20:29	20m	-9 / -	YO3NSS	- / -5	5	✓ Closing fragment
08-21 20:28	20m	-4 / -4	OK2CNI	+8 / +3	5	✓ Full exchange observed
08-21 20:25	20m	-4 / -	IU1FIG	- / 0	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
220145  -4 1230  TA7ARH GM4VAC RR73
220200  +8  405  GM4VAC TA7ARH R-15
220215  -4 1230  TA7ARH GM4VAC RR73
220230  +9  405  GM4VAC TA7ARH R-15 (x2)
220315  +0 1230  TA7ARH GM4VAC RR73
220415  -1 2377  UA9CR GM4VAC +03
220430  +1 2376  GM4VAC UA9CR R-17
220445  +2 2377  UA9CR GM4VAC RR73
220500  +2 2376  GM4VAC UA9CR RR73
220815  -7 1641  LU8HH GM4VAC -13 (x5)

20m

UTC    dB Audio  Message
065215 -17  851  IW5ALZ GM4VAC -15
065230  -6 3043  GM4VAC IW5ALZ R+00
065245 -13  850  IW5ALZ GM4VAC RR73
065330  +4  851  GM4VAC E70SZ JN84
065500  -5 3043  GM4VAC IW5ALZ JN53 (x2)
065615 -15  850  CQ GM4VAC IO77
065630 +12  851  GM4VAC E70SZ JN84 (x5)
070415 -24 1527  TJ1GD GM4VAC -20
071000 -10 1387  GM4VAC HB9EXE JN47 (x2)

80m

UTC    dB Audio  Message
210145  +1 1995  GM4VAC E70SZ JN84
210200  -9 1995  E70SZ GM4VAC -01
210215  -2 1995  GM4VAC E70SZ R-15
210230  -2 1995  E70SZ GM4VAC RR73 (x2)
210315  +0 1995  GM4VAC E70SZ R-02 (x2)
210415  +4 1995  GM4VAC IK3/UY7LA R-02

160m

UTC    dB Audio  Message
210015 -11 1981  GM4VAC DL3RC JO44 (x2)

10m

UTC    dB Audio  Message
193430  -4 1005  GM4VAC PD0IFI JO32 (x3)
194530 -13 1963  GM4VAC DO5KHR JO30 (x5)

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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