YO9CX — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Romania Most frequent locator attributed to this token: KN35

Receiver-side FT8 activity involving YO9CX, decoded by SO8OO in southeastern Poland. 637 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 15 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-08-21.

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 637 FT8 messages attributed to YO9CX as the transmitting token by decoded message structure across 15 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (57%), followed by 20 m (40%) and 80 m (3%). Most decodes (81%) fell within the six-hour window 17:00-23:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

637

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

80m · 19 40m · 366 20m · 252

First attributed message: 2026-06-13
Last attributed message: 2026-08-21 22:19 UTC

Observed FT8 message patterns

Attributed sample: 637 messages
Active dates: 15 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -22 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 292, moderate (-15 to -9 dB) 220, strong (≥ -8 dB) 125.

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 YO9CX in decoded directed-looking exchanges:

DL6EL · Fed. Rep. of Germany ×2 TA2ED · Asiatic Turkey ×2 UR5EPZ · Ukraine ×2 DJ9NY · Fed. Rep. of Germany ×2 OE6TNO · Austria ×2 R4KR · European Russia ×2 2I0EVH · Northern Ireland 9A1IST · Croatia BG4ILJ · China BH4GUO · China BI4MPH · China BI9ALM · China

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 YO9CX

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: KN35 · 185 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 628 km (approx.)
Last such locator decoded: 2026-08-21 22:03 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	YO9CX S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-29 18:26	20m	- / -15	GW4RDW	-9 / -	2	✓ Closing fragment
08-29 18:02	20m	- / -12	DK3NU	+2 / -	2	Partial capture
08-29 16:14	20m	- / -14	F4MWC	+3 / -	2	✓ Closing fragment
08-29 15:39	20m	- / -21	EI9FVB	+7 / -	5	Partial capture
08-29 14:23	20m	- / -21	EA7R	0 / -	2	✓ Closing fragment
08-29 14:20	20m	- / -11	EC3A	-10 / -	2	✓ Closing fragment
08-29 14:06	20m	- / -6	PD2AM	-18 / -	2	Partial capture
08-29 14:04	20m	- / -7	EA4T	-12 / -	3	✓ Closing fragment
08-29 13:50	20m	- / -10	F6EKI	-6 / -	2	✓ Closing fragment
08-29 13:40	20m	- / -	F4FPR	-17 / -	3	Partial capture
08-29 13:32	20m	- / -13	G7SQW	-1 / -	2	✓ Closing fragment
08-29 13:27	20m	- / -12	PD0KS	-9 / -	3	✓ Closing fragment
08-25 18:24	20m	- / -14	EA2WX/P	-7 / -	2	✓ Closing fragment
08-25 18:19	20m	- / -9	EA8AP	-6 / -	2	✓ Closing fragment
08-25 18:09	20m	- / -3	CT1END/P	-14 / -	2	✓ Closing fragment
08-25 18:05	20m	- / -3	EA5JLN	+2 / -	3	✓ Closing fragment
08-21 22:19	80m	-16 / -3	R4FBT	-2 / -5	4	✓ Full exchange observed
08-21 22:18	80m	-18 / -11	SP5FXJ	+16 / -4	4	✓ Full exchange observed
08-21 22:17	80m	-13 / -12	IT9PQJ	-2 / -8	4	✓ Full exchange observed
08-21 22:16	80m	-7 / +4	IK2SGB	-6 / -3	4	✓ Full exchange observed
08-21 22:15	80m	-7 / -	R8LCI	- / -14	2	✓ Closing fragment
08-21 22:14	80m	-6 / -4	UW5KW	+14 / -6	4	✓ Full exchange observed
08-21 22:13	40m	-6 / -14	UA0SCF	-18 / -15	4	✓ Full exchange observed
08-21 22:09	40m	-6 / -	BD8ELZ	- / -15	3	✓ Closing fragment
08-21 22:03	40m	-8 / -	DC1SN	- / -10	2	✓ Closing fragment
08-21 22:02	40m	-9 / -10	R4PFU	-18 / -19	3	✓ Full exchange observed
08-21 21:56	40m	-3 / -	LB9ZG	- / -	2	✓ Closing fragment
08-19 22:23	40m	-12 / -	PA2KV	-2 / -10	6	✓ Full exchange observed
08-19 22:20	40m	-8 / -	SP2DTW	-16 / -	2	✓ Closing observed
08-19 22:17	40m	-7 / -	HS0ZEE	- / -13	2	Partial capture
08-19 22:09	40m	-16 / -	M0PPT	- / -9	2	Partial capture
08-19 22:06	40m	-8 / +1	PA3ANG	-23 / -13	3	✓ Full exchange observed
08-19 21:57	40m	-8 / -	DL9KM	- / -2	2	✓ Closing fragment
08-19 21:56	40m	-7 / -5	PD1AIQ	+3 / -2	4	✓ Full exchange observed
08-19 21:55	40m	-3 / -	DL4CAT	-3 / -2	3	✓ Closing observed
08-19 21:52	40m	-3 / -	SV1CIV	- / -7	2	✓ Closing fragment
08-19 21:51	40m	-4 / -	RN3AOE	-16 / -16	3	✓ Closing observed
08-19 21:48	40m	-10 / -8	R4KR	-10 / -4	4	✓ Full exchange observed
08-19 21:22	40m	-23 / -	OJ0YL	- / -10	2	Partial capture
08-19 21:19	40m	- / -12	R3KLE	-11 / -	2	✓ Closing fragment
08-19 21:15	40m	- / -17	SP2HHX	-10 / -	3	✓ Closing fragment
08-19 20:52	40m	-14 / -	M7BSI	- / -10	2	✓ Closing fragment
08-19 20:44	40m	-14 / -	EA5PG	-14 / -	2	✓ Closing observed
08-19 20:42	40m	-17 / -5	YO6PNM	-8 / -18	4	✓ Full exchange observed
08-19 20:41	40m	-17 / -15	DL8MAK/P	-20 / -11	4	✓ Full exchange observed
08-19 20:39	40m	-12 / -7	OE6TNO	-11 / -7	5	✓ Full exchange observed
08-19 20:36	40m	-16 / -10	R4UAS	-12 / -13	3	✓ Full exchange observed
08-19 20:32	40m	-14 / -	JH2FXK	- / -10	3	✓ Closing fragment
08-19 20:26	40m	- / -	DK2SP	-11 / -	4	Partial capture
08-19 20:23	40m	-20 / -	OM6APJ	- / -6	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
153930  +4 2368  YO9CX EI9FVB R-21 (x5)
160330  +0 1281  YO9CX R4PHH R-05
161430  +0 1775  YO9CX F4MWC R-14 (x2)
163830 -13 1874  YO9CX G0RPM 73
180200  +3 1107  YO9CX DK3NU JO40 (x2)
182600 -10 1495  YO9CX GW4RDW R-15 (x2)
183330  -7 1808  YO9CX R9WH 73
185900 -18 2044  YO9CX EI5JHB R-12

80m

UTC    dB Audio  Message
221615 -10  848  YO9CX IK2SGB R+04
221630  -8 1672  IK2SGB YO9CX RR73
221645  -2  848  YO9CX IK2SGB 73
221700 -10 1671  IT9PQJ YO9CX -08
221715  -1 2451  YO9CX IT9PQJ R-12
221730 -16 1672  IT9PQJ YO9CX RR73
221745  -2 2451  YO9CX IT9PQJ 73
221800 -14 1672  SP5FXJ YO9CX -04
221815 +15 1204  YO9CX SP5FXJ R-11
221830 -21 1672  SP5FXJ YO9CX RR73
221845 +16 1204  YO9CX SP5FXJ 73
221900 -21 1672  R4FBT YO9CX -05
221915  -1 1948  YO9CX R4FBT R-03
221930 -12 1672  R4FBT YO9CX RR73
221945  -2 1948  YO9CX R4FBT 73

40m

UTC    dB Audio  Message
220330 -10 1713  DC1SN YO9CX -10 (x2)
220415 -17 1713  YO9CX R4PFU R-10 (x2)
220730 -13 1713  M7KNM YO9CX RR73
220830  -8 1713  2E0GKF YO9CX -18
220930  -8 1713  BD8ELZ YO9CX RR73 (x2)
221015  -6 2465  YO9CX RD9M/3 R-04
221100  -1 1712  BD8ELZ YO9CX -14
221200  -5 1712  <...> YO9CX -15
221300  -6 1712  UA0SCF YO9CX -15
221315 -18 1976  YO9CX UA0SCF R-14
221330  -7 1712  UA0SCF YO9CX RR73
221345 -19 1976  YO9CX UA0SCF 73

10m

UTC    dB Audio  Message
132930 +13 2834  YO9CX F1PBZ -14

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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