GM4ZTO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Scotland Most frequent locator attributed to this token: IO75

Receiver-side FT8 activity involving GM4ZTO, decoded by SO8OO in southeastern Poland. 1,117 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, across 48 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-08.

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 1,117 FT8 messages attributed to GM4ZTO 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 (99%), followed by 40 m (1%) and 60 m (0%). The busiest six-hour window was 15:00-21:00 UTC, containing 45% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

1,117

Messages attributed

UTC dates decoded

237

Active 15-min windows

-9 dB

Estimated median S/N

Bands

60m · 1 40m · 15 20m · 1,101

First attributed message: 2026-06-06
Last attributed message: 2026-09-08 22:09 UTC

Observed FT8 message patterns

Attributed sample: 1,117 messages
Active dates: 48 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -15 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 92, moderate (-15 to -9 dB) 511, strong (≥ -8 dB) 514.

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 GM4ZTO in decoded directed-looking exchanges:

F1IQH · France ×3 F4HSB · France ×3 ON1DGN · Belgium ×2 DL6ZOG · Fed. Rep. of Germany ×2 9A5E · Croatia BG0DLA · China CR2WWA · Azores CT7ALI · Portugal DG9FDM · Fed. Rep. of Germany DK4OX · Fed. Rep. of Germany DL1TJ · Fed. Rep. of Germany DL1UDO · 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 GM4ZTO

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: IO75 · 744 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,894 km (approx.)
Last such locator decoded: 2026-09-07 20:01 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	GM4ZTO S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-09 08:19	40m	- / -10	DD1JD	-17 / -	3	✓ Closing fragment
09-09 07:45	40m	- / -	EU7FBB	+8 / -	3	Partial capture
09-09 07:41	40m	- / -	PA1CG	-9 / -	6	Partial capture
09-08 22:09	60m	- / -	DL7ARV	-4 / -	6	Partial capture
09-08 22:08	60m	-13 / -	EA1IOK	-4 / -12	5	Partial capture
09-08 22:05	60m	- / -8	VE1YX	-8 / -	4	✓ Closing fragment
09-08 22:04	60m	- / -	EA3EDU	+8 / -	7	Partial capture
09-08 22:02	60m	- / -	F1HFP	-9 / -	3	Partial capture
09-08 22:01	60m	- / -10	IK6BSN	-2 / -	4	✓ Closing fragment
09-08 07:46	40m	- / -5	DF5DY	-4 / -	2	✓ Closing fragment
09-07 19:59	40m	-4 / 0	DL1RAZ	+10 / -15	23	Partial capture
09-07 19:54	40m	- / -	IU2WCY	-3 / -	2	Partial capture
09-07 19:52	40m	- / -16	F1PBZ	+1 / -	3	Partial capture
09-05 08:11	40m	- / -9	DL6ZOG	-5 / -	3	✓ Closing fragment
09-04 22:39	40m	-4 / -	W1FAM	- / -7	2	Partial capture
09-04 20:47	40m	- / -	RW3DDZ	-9 / -	4	✓ Closing fragment
09-04 08:58	40m	- / -5	DL6ZOG	-14 / -	2	✓ Closing fragment
09-04 08:41	40m	- / -5	PE2K	-12 / -	3	✓ Closing fragment
09-04 08:02	40m	- / -	F1HFP	-21 / -	3	✓ Closing fragment
09-03 21:38	40m	- / -	DF2TG	-6 / -	2	Partial capture
09-03 20:27	40m	- / -16	F1PBZ	+3 / -	3	Partial capture
08-24 20:19	20m	-4 / -	IZ4EFV	- / +1	5	Partial capture
08-24 19:54	20m	-10 / -	IZ4EFV	- / +1	2	Partial capture
08-24 19:42	20m	- / -	IZ4EFV	+2 / -	2	Partial capture
08-24 19:15	20m	- / -	DG5PW	+4 / -	5	Partial capture
08-24 17:08	20m	+11 / -	OE4DJN	- / -3	2	Partial capture
08-24 09:38	20m	- / -	DH9DR	+3 / -	3	Partial capture
08-24 08:12	20m	- / +7	M8KKH	-16 / -	2	Partial capture
08-24 08:00	20m	- / -	DH2RL	+12 / -	5	Partial capture
08-24 07:08	40m	- / -10	F1PBZ	-6 / -	3	Partial capture
08-23 20:51	40m	- / -10	F1IQH	-3 / -	3	✓ Closing fragment
08-23 20:51	40m	- / -	OO0O	+1 / -	9	Partial capture
08-23 20:48	40m	- / +4	CT2HEX	-8 / -	3	✓ Closing fragment
08-23 13:24	20m	-3 / -	EA3JAQ	- / -22	2	✓ Closing fragment
08-23 08:26	20m	-3 / -5	UA3PAB	-1 / -	4	✓ Closing observed
08-22 16:58	20m	-8 / -	BI1HJR	- / -17	4	Partial capture
08-22 16:56	20m	-11 / -	IK4LZH	-4 / -	5	✓ Closing observed
08-20 13:44	20m	- / -19	DG1AS	-14 / -	2	Partial capture
08-20 11:25	20m	-2 / -	SP9WAZ	- / -2	2	✓ Closing fragment
08-20 08:53	20m	-4 / -	F4HSB	- / -6	2	Partial capture
08-19 20:23	20m	-6 / -	RL3AM	- / -12	2	✓ Closing fragment
08-19 20:21	20m	-8 / +1	IK5ZPU	-9 / -6	3	Partial capture
08-19 20:18	20m	-6 / -	TJ1GD	- / -25	2	Partial capture
08-19 20:09	20m	- / -3	IK4LZH	-7 / -	5	Partial capture
08-19 19:52	20m	-3 / -	LY2TS	- / -	2	✓ Closing fragment
08-17 19:06	20m	-10 / -	DL1TJ	- / -14	2	✓ Closing fragment
08-17 19:02	20m	- / -	DL1R	+3 / -	9	Partial capture
08-17 18:56	20m	-11 / -	BG7JPT	- / -13	3	Partial capture
08-17 07:31	20m	-7 / -	M7GDQ	- / -9	2	✓ Closing fragment
08-13 19:17	20m	- / -	IK4LZH	-5 / -	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
074700  -2  577  GM4ZTO DF5DY 73
090730 -12  563  GM4ZTO DL4YDR JO32
074145 -10  565  GM4ZTO PA1CG JO22 (x6)
074545 +11  564  GM4ZTO EU7FBB KO43 (x3)
075615 -14 2491  GM4ZTO F1PBZ -15
081945 -19 1434  GM4ZTO DD1JD JO31 (x3)

60m

UTC    dB Audio  Message
220615  +7  466  GM4ZTO EA3EDU JN01 (x2)
220715  -9  555  GM4ZTO VE1YX 73
220715  +6  466  GM4ZTO EA3EDU JN01
220815  -1  957  GM4ZTO EA1IOK IN62 (x2)
220900 -13  557  EA1IOK GM4ZTO -12
220915  -9  956  GM4ZTO EA1IOK IN62
220915  -4 2758  GM4ZTO DL7ARV JO62
220945  +0  957  GM4ZTO EA1IOK IN62
220945  -6 2758  GM4ZTO DL7ARV JO62 (x5)

20m

UTC    dB Audio  Message
201945  -3  599  IZ4EFV GM4ZTO +01 (x5)
070100  +3  602  GM4ZTO TA3NK KM39
070745  -7  600  VK3ARW GM4ZTO -03
070815 -14  600  CQ GM4ZTO IO75 (x4)
071045  +0  601  LY2BVB GM4ZTO +01
071245  -8  602  CQ GM4ZTO IO75 (x3)

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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