OK1ZCF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Czech Republic Most frequent locator attributed to this token: JO80

Receiver-side FT8 activity involving OK1ZCF, decoded by SO8OO in southeastern Poland. 669 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 31 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-09-04.

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 669 FT8 messages attributed to OK1ZCF as the transmitting token by decoded message structure across 31 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 80 m (28%) and 20 m (19%). Several six-hour UTC windows tied for the largest share (74%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (71%); the estimated median was -1 dB.

Overview

669

Messages attributed

UTC dates decoded

Active 15-min windows

-1 dB

Estimated median S/N

Bands

80m · 186 40m · 354 20m · 129

First attributed message: 2026-06-09
Last attributed message: 2026-09-04 03:55 UTC

Observed FT8 message patterns

Attributed sample: 669 messages
Active dates: 31 UTC dates
Estimated median S/N: -1 dB
Estimated 10th-90th percentile: -15 to +11 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 65, moderate (-15 to -9 dB) 126, strong (≥ -8 dB) 478.

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 OK1ZCF in decoded directed-looking exchanges:

K1SFA · United States ×2 NT4K · United States ×2 W3XG · United States LZ1BT · Bulgaria OA4ENG · Peru OM8AOP · Slovak Republic PY4DO · Brazil SQ5CZJ · Poland AD4AV · United States N2TH · United States DK0CD · Fed. Rep. of Germany VE3LWY · Canada

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 OK1ZCF

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: JO80 · 506 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 347 km (approx.)
Last such locator decoded: 2026-09-04 03:55 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	OK1ZCF S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-04 03:50	40m	-5 / -	KR4DJY	- / -16	5	Partial capture
09-04 03:43	40m	+4 / -	KK7UXY	- / -	4	Partial capture
09-04 03:37	40m	+2 / -	KK7UXY	- / -	7	Partial capture
09-01 02:06	40m	- / -11	PT7YV	-4 / -	2	✓ Closing fragment
09-01 02:01	40m	-19 / -	HI3LAG	- / -	2	Partial capture
09-01 01:57	80m	- / -	G8OO	+2 / -	9	Partial capture
09-01 01:53	80m	+4 / -	K4YT	- / -	2	Partial capture
08-31 04:41	40m	- / +2	OS4K	-14 / -	3	Partial capture
08-31 04:40	40m	- / -	UR3QRP	-12 / -	2	Partial capture
08-31 04:05	40m	- / -	EA5HM	-17 / -	5	Partial capture
08-30 17:27	20m	- / -	M9SDD	-15 / -	3	Partial capture
08-30 01:39	80m	- / -	EA5HM	-6 / -	4	Partial capture
08-30 01:33	80m	+15 / -	G0FFB	- / -13	3	Partial capture
08-30 01:32	80m	- / -	YO8XFU	-2 / -	3	Partial capture
08-30 01:29	80m	+13 / -	SP1TP	-3 / -10	9	✓ Closing observed
08-30 01:28	80m	- / -	DL9KM	-3 / -	7	Partial capture
08-30 01:28	80m	- / -	SP1ZMO	0 / -	2	Partial capture
08-30 01:27	80m	- / -	G8OO	0 / -	9	Partial capture
08-30 01:26	80m	+15 / -	K1SFA	- / -14	2	✓ Closing fragment
08-29 03:46	40m	- / +5	IZ8PPI	-18 / -	2	Partial capture
08-29 03:38	40m	- / -13	NT4K	-16 / -	5	✓ Closing fragment
08-29 03:32	40m	- / -	CT2HEX	-14 / -	3	Partial capture
08-25 03:43	20m	- / -	DL1R	-5 / -	7	Partial capture
08-25 03:33	20m	- / -20	W6NWS	-5 / -	3	✓ Closing fragment
08-24 05:13	20m	- / -	RZ4FWA	+2 / -	4	Partial capture
08-23 20:43	40m	-2 / -	BD8SN	- / -18	2	✓ Closing fragment
08-23 20:42	40m	- / +9	DK0ACI	-8 / -	3	Partial capture
08-23 20:41	40m	- / -	OE8PIT	-2 / -	4	Partial capture
08-23 20:20	40m	+4 / -	G0CER	- / -22	4	Partial capture
08-23 20:18	40m	-2 / +8	M7KNM	-10 / -4	5	✓ Full exchange observed
08-23 04:36	20m	- / -	RZ4FWA	-19 / -	5	Partial capture
08-22 03:47	20m	- / 0	PD2WL	+3 / -	10	Partial capture
08-22 03:47	20m	- / -	PD3LKN	-12 / -	4	Partial capture
08-16 05:43	40m	-8 / -	OA4ENG	- / -15	8	✓ Closing fragment
08-07 02:36	40m	- / -	F5MYH	-21 / -	10	Partial capture
08-07 02:07	80m	- / -	DO1OAS	-9 / -	9	Partial capture
08-07 02:05	80m	+9 / -	VE3LWY	-20 / -15	5	✓ Closing observed
08-07 02:04	80m	- / -9	SQ6ELK	0 / -	2	Partial capture
08-07 02:01	80m	- / -	DL9KM	-9 / -	7	Partial capture
08-07 01:58	80m	+10 / -20	N8KR	-24 / -16	4	✓ Full exchange observed
08-07 01:56	80m	+8 / -21	W9HT	-24 / -14	4	✓ Full exchange observed
08-07 01:54	80m	- / +9	DO1OAS	-10 / -	7	Partial capture
08-07 01:54	80m	- / -	ON4MAP	-17 / -	3	Partial capture
08-06 03:47	20m	- / -	UA4FKT	-8 / -	3	Partial capture
08-05 02:42	80m	+8 / -	HI8UD	- / -	2	Partial capture
08-05 02:40	80m	+10 / -19	<...>	-12 / -8	3	Partial capture
08-05 02:37	80m	+16 / -	KI4R	- / -19	2	✓ Closing fragment
08-05 02:34	80m	- / -	ON4MAP	-16 / -	4	Partial capture
08-05 02:33	80m	- / -	UR4LG	-18 / -	2	Partial capture
08-04 17:59	80m	+10 / -7	UA1AEL	+2 / -15	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
034615  -1 1664  RC9WC OK1ZCF 73
034645  -3 1664  CQ DX OK1ZCF JO80 (x4)
035015  -4 1702  KR4DJY OK1ZCF JO80 (x5)
035245  -3 1702  CQ DX OK1ZCF JO80 (x4)
032245 -19 1492  OK1ZCF UG4P -14

80m

UTC    dB Audio  Message
015345  +6 1572  K4YT OK1ZCF JO80
015630  +8 1572  CQ DX OK1ZCF JO80 (x3)
015745  +6  618  OK1ZCF G8OO JO02
015800  +8 1572  CQ DX OK1ZCF JO80
015815  +6  618  OK1ZCF G8OO JO02
015830 +12 1572  CQ DX OK1ZCF JO80
015845  +2  618  OK1ZCF G8OO JO02 (x7)

20m

UTC    dB Audio  Message
033400  -6 1621  OK1ZCF W6NWS -20 (x2)
033630 -10 1621  OK1ZCF DK4HM JN58
034300 -12 2658  OK1ZCF DL1R JN58 (x7)
172730 -18 1485  OK1ZCF M9SDD IO83 (x3)
172945  +5 1816  OK1ZCF TA1MB KN41
173045 -16 1564  OK1ZCF DB1EF JO41

10m

UTC    dB Audio  Message
105715  -2 2680  OK1ZCF TM2WWA -17 (x4)
110215 -15 2437  OK1ZCF IZ0LNP R-06
110215  +9  491  OK1ZCF IK4LZH JN54
110245  -8 2435  OK1ZCF IZ0LNP 73
110245  +7  491  OK1ZCF IK4LZH JN54 (x3)
111445 -18 1578  OK1ZCF DF3VW JN39

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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