ZW5B — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Brazil Most frequent locator attributed to this token: GG54

Receiver-side FT8 activity involving ZW5B, decoded by SO8OO in southeastern Poland. 201 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 28 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-15.

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 201 FT8 messages attributed to ZW5B as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (39%), followed by 40 m (29%) and 80 m (28%). Most decodes (82%) fell within the six-hour window 20:00-02:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

201

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

80m · 56 40m · 58 20m · 79 10m · 8

First attributed message: 2026-06-08
Last attributed message: 2026-09-15 01:26 UTC

Observed FT8 message patterns

Attributed sample: 201 messages
Active dates: 28 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -20 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 40, moderate (-15 to -9 dB) 67, strong (≥ -8 dB) 94.

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 ZW5B in decoded directed-looking exchanges:

3A2MW · Monaco ×2 TN8GD · Republic of the Congo ×2 9J2FI · Zambia BI1HJR · China DL1RI · Fed. Rep. of Germany EA4GVT · Spain PI4DX · Netherlands RA4NCC · European Russia T22TT · Tuvalu ZC4RH · UK Base Areas on Cyprus 5A1AL · Libya CT3IQ · Madeira Islands

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 ZW5B

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: GG54 · 80 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 10,892 km (approx.)
Last such locator decoded: 2026-09-15 01:26 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	ZW5B S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-08 01:48	40m	- / -8	R9SY	-8 / -	3	Partial capture
09-08 01:46	40m	-17 / -	J38DX	- / -6	3	Partial capture
09-08 01:25	80m	- / -13	R9SY	-13 / -	2	Partial capture
09-05 20:51	80m	- / -	IZ0SQZ	-9 / -	4	Partial capture
09-05 20:46	80m	- / -	IZ0SQZ	-8 / -	3	Partial capture
09-05 00:52	80m	-14 / -	AP2HA	- / -	3	✓ Closing fragment
08-30 10:06	20m	- / -16	RV3GZ	+3 / -	3	Partial capture
08-30 05:38	40m	- / -	SV1MOZ	-14 / -	2	Partial capture
08-30 05:33	40m	-15 / -4	DH6DAO	+1 / -	5	✓ Closing observed
08-30 05:16	80m	- / -	DO2NM	-12 / -	3	Partial capture
08-30 05:08	80m	- / -	DO7HZ	-22 / -	2	Partial capture
08-30 05:07	80m	- / -2	ON1JP	-24 / -	2	Partial capture
08-30 05:05	80m	- / -	F4BYA	+3 / -	3	Partial capture
08-30 05:05	80m	- / -	F5NUI	-10 / -	3	Partial capture
08-30 05:05	80m	- / -18	IK4UXA	-7 / -	2	✓ Closing fragment
08-30 05:03	80m	- / -13	ON6PL	-6 / -	4	✓ Closing fragment
08-30 03:29	160m	- / -	F4UJU	-8 / -	2	Partial capture
08-30 02:19	160m	- / -	OH2BGD	+5 / -	3	Partial capture
08-30 02:12	160m	- / -	R4CY	-1 / -	2	Partial capture
08-30 02:10	160m	- / -	SP9JZU	+10 / -	2	Partial capture
08-30 01:41	160m	- / -	LA0FA	+3 / -	5	Partial capture
08-30 01:39	160m	- / -	OH2BGD	+6 / -	2	Partial capture
08-30 01:34	160m	- / -20	LA4GHA	-12 / -	7	Partial capture
08-30 01:33	160m	- / -19	SP5ES	+12 / -	2	Partial capture
08-30 01:32	160m	- / -	OH2BGD	+4 / -	7	Partial capture
08-30 01:32	160m	- / -	SP2HNF	+14 / -	7	Partial capture
08-30 01:32	160m	- / -9	DL1RWN	+14 / -	3	Partial capture
08-30 01:32	160m	- / -	SP9JZU	+11 / -	6	Partial capture
08-30 00:49	160m	- / -13	DF6PW	-4 / -	2	Partial capture
08-30 00:49	160m	- / -14	DL1RWN	+3 / -	3	Partial capture
08-30 00:46	80m	- / +2	EI4LE	-7 / -	10	Partial capture
08-30 00:46	80m	- / -	DO1DX	+6 / -	2	Partial capture
08-30 00:16	40m	- / -	RD9U	-7 / -	3	Partial capture
08-30 00:15	40m	-3 / -	IU0VYT	0 / -6	3	✓ Closing observed
08-30 00:13	40m	-4 / -	RW3FY	- / -6	2	✓ Closing fragment
08-30 00:12	40m	-4 / -	R8KBM	- / -19	2	✓ Closing fragment
08-30 00:10	40m	-6 / -	CT3IQ	- / 0	3	✓ Closing fragment
08-30 00:08	40m	-5 / -	TN8GD	- / -2	4	✓ Closing fragment
08-30 00:08	40m	- / -	IU8UHK	-13 / -	3	Partial capture
08-30 00:08	40m	- / -	RU4LM	-8 / -	2	Partial capture
08-29 22:35	160m	- / -	PA3FR	-2 / -	2	Partial capture
08-29 22:32	40m	- / -	UB3FDM	-1 / -	5	Partial capture
08-29 22:19	40m	-5 / -	DS2MGT	- / -20	3	✓ Closing fragment
08-29 22:19	40m	-6 / -3	UW5IM	-6 / -1	3	Partial capture
08-29 22:15	40m	-5 / -	5A1AL	- / -19	4	✓ Closing fragment
08-29 22:14	40m	- / -	PA0APR	-8 / -	2	Partial capture
08-29 22:09	40m	- / -18	R4UR	-5 / -	3	✓ Closing fragment
08-29 20:13	20m	- / -	Z32BB	-16 / -	2	Partial capture
08-29 20:10	20m	-9 / -	9J2FI	- / -5	3	✓ Closing fragment
08-29 20:05	20m	-14 / -	9J2FI	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
005415 -18 2292  AP2HA ZW5B 73
005500  +9 1264  ZW5B OH8SR KP44
204600 -10 1341  ZW5B IZ0SQZ JN62 (x7)
012315 -22 2150  7X5CY ZW5B GG54
012530 -13 1396  ZW5B R9SY -13 (x2)
011500  +7  473  ZW5B OH0Z -04
012615 -18 2301  OH0Z ZW5B GG54
012730 +17  475  ZW5B RR73; LU3CQ <...> -10

40m

UTC    dB Audio  Message
053315  +3 2505  ZW5B DH6DAO JO41
053345 -13 1168  ZW5B DK5EI JO42
053345  +5 2505  ZW5B DH6DAO R-04 (x3)
053500 -11  681  5N0YEN ZW5B GG54
053530 -15  682  DH6DAO ZW5B 73
053845 -12  681  ZW5B SV1MOZ KM17 (x2)
014600 -15 2129  J38DX ZW5B GG54 (x3)
014815  -5 1375  ZW5B R9SY -08 (x3)

20m

UTC    dB Audio  Message
185815 -13 2510  5H6PJ ZW5B GG54
200515 -13 2372  9J2FI ZW5B GG54 (x2)
200615 -13 2372  CQ ZW5B GG54
200645 -10 2372  BH5HIE ZW5B +04
200745  -8 2372  BA4UFM ZW5B -12
200845  -5 2372  ZW5B SV5BYP KM46
201015 -10 2372  9J2FI ZW5B GG54 (x3)
201300 -16  875  ZW5B Z32BB KN02 (x2)
100645  +7  880  ZW5B RV3GZ KO92 (x3)

160m

UTC    dB Audio  Message
014130  +2 1605  ZW5B LA0FA JO59 (x4)
020945  +8 2467  ZW5B F5UKW JN12
021045  +8 1673  ZW5B SP9JZU JN99 (x2)
021245  -3 2223  ZW5B R4CY LO31 (x2)
021930  +7  896  ZW5B OH2BGD KP20 (x3)
032930  -6 2366  ZW5B F4UJU JN06
033000 -17 1604  ZW5B GM5G IO87
033000 -10 2367  ZW5B F4UJU JN06

10m

UTC    dB Audio  Message
175830 -10 1898  ZW5B IZ7UIU JN80

60m

UTC    dB Audio  Message
022330  -9  639  ZW5B FP/KV1J +07
022430  +0 2469  ZW5B OE5DML JN78 (x3)
024330 -13 1900  ZW5B DK7ZT -12 (x2)
024430  -4  383  ZW5B SP4NKJ KO13
024430 -16 1900  ZW5B DK7ZT -12
024630 -14 2085  ZW5B OE5DML JN78
024730 -18 1900  ZW5B DK7ZT RR73

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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