RX4CK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO11

Receiver-side FT8 activity involving RX4CK, decoded by SO8OO in southeastern Poland. 214 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-18 and 2026-09-12.

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 214 FT8 messages attributed to RX4CK as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (89%), followed by 40 m (7%) and 10 m (3%). Most decodes (90%) fell within the six-hour window 16:00-22:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (74%); the estimated median was -5 dB.

Overview

214

Messages attributed

UTC dates decoded

Active 15-min windows

-5 dB

Estimated median S/N

Bands

80m · 190 40m · 15 20m · 2 10m · 7

First attributed message: 2026-06-18
Last attributed message: 2026-09-12 21:06 UTC

Observed FT8 message patterns

Attributed sample: 214 messages
Active dates: 7 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -11 to +1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 54, strong (≥ -8 dB) 158.

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 RX4CK in decoded directed-looking exchanges:

RA4ADF · European Russia RW3ZR · European Russia UA4FOH · European Russia UB4HPQ · European Russia DD8BA · Fed. Rep. of Germany DO1BOC · Fed. Rep. of Germany EW3FH · Belarus IK2HNG · Italy IK6GTF · Italy IV3GHY · Italy OK1VKX · Czech Republic R2SDZ · European Russia

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 RX4CK

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: LO11 · 117 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,498 km (approx.)
Last such locator decoded: 2026-09-12 21:06 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	RX4CK S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 21:03	80m	- / -	DO2HC	-10 / -	2	Partial capture
09-12 21:00	80m	-8 / -	R4HLO	- / -2	2	✓ Closing fragment
09-12 20:59	80m	-8 / -	R8CC	- / -2	2	✓ Closing fragment
09-12 20:39	80m	- / -	PF1B	-10 / -	2	Partial capture
09-12 20:34	80m	- / -19	ON5AM	-1 / -	4	Partial capture
09-12 20:34	80m	-5 / -	RV3IN	+3 / -9	6	✓ Full exchange observed
09-12 20:34	80m	-1 / -	TA4RC	-13 / -11	3	✓ Closing observed
09-12 20:33	80m	- / -	OZ1LGJ	-1 / -	2	Partial capture
09-12 20:32	80m	- / -	R6DHI	-12 / -	2	Partial capture
09-12 20:30	80m	- / -	PF1B	-12 / -	2	Partial capture
09-12 20:30	80m	-2 / +2	RZ4AT	-2 / +3	5	✓ Full exchange observed
09-12 20:28	80m	- / -	DO2HC	+2 / -	4	Partial capture
09-12 20:26	80m	0 / -14	DO1BOC	-7 / -11	5	✓ Full exchange observed
09-12 20:24	80m	+8 / -13	DD8BA	-7 / -13	3	✓ Full exchange observed
09-01 14:25	40m	-8 / -	UB4HPQ	- / -6	2	✓ Closing fragment
09-01 14:23	40m	-12 / -21	UA4FOH	-12 / -8	5	✓ Full exchange observed
09-01 14:21	40m	-8 / -	RW3ZR	- / -9	2	✓ Closing fragment
08-01 20:05	80m	- / -	US1EA	-2 / -	5	Partial capture
08-01 20:01	80m	- / -	PA2WCB	-10 / -	5	Partial capture
08-01 19:57	80m	- / -1	RA3ZOM	-1 / -	2	✓ Closing fragment
08-01 19:53	80m	- / -	DH5BO	+3 / -	2	Partial capture
08-01 19:51	80m	-8 / -10	RY9C	+14 / -	3	✓ Closing observed
08-01 19:48	80m	-8 / -3	RA3WY	+1 / 0	5	✓ Full exchange observed
08-01 19:44	80m	- / -	PA2WCB	-9 / -	2	Partial capture
08-01 19:43	80m	-2 / -	R35ARDF	- / +1	2	Partial capture
08-01 19:37	80m	-4 / -10	IV3GHY	+3 / -15	3	✓ Full exchange observed
08-01 19:35	80m	- / +2	RA3TVW	-1 / -	3	✓ Closing fragment
08-01 19:30	80m	-1 / -5	RA2FU	-7 / -11	6	✓ Full exchange observed
08-01 19:30	80m	-7 / -8	SV9MBH	-20 / -14	5	✓ Full exchange observed
08-01 19:28	80m	-3 / +4	RD2T	-7 / -8	5	✓ Full exchange observed
08-01 19:23	80m	-10 / -	RY4D	-9 / -3	4	✓ Full exchange observed
08-01 19:22	80m	-8 / 0	RW6HB	+5 / -7	5	✓ Full exchange observed
08-01 19:21	80m	- / -	DO4CTH	-13 / -	3	Partial capture
08-01 19:13	80m	-8 / -15	OK1VKX	+8 / -9	12	✓ Full exchange observed
08-01 19:10	80m	- / -2	UA4LDP	-15 / -	3	✓ Closing fragment
08-01 18:59	80m	-11 / -5	RC3D	+8 / 0	6	✓ Full exchange observed
08-01 18:59	80m	-12 / -7	RZ7RCP	-11 / -12	4	✓ Full exchange observed
08-01 18:55	80m	-7 / -	UA9XL	- / -18	3	Partial capture
08-01 18:55	80m	-9 / -6	RA6OD	+3 / -	4	✓ Closing observed
08-01 18:48	80m	-7 / -2	R3DFS	-10 / -2	4	✓ Full exchange observed
08-01 18:46	80m	-6 / -8	IK6GTF	-7 / -13	8	✓ Full exchange observed
08-01 18:44	80m	-7 / -7	UB3LBU	-5 / -	3	✓ Closing observed
08-01 18:10	80m	- / -	IK6GTF	-13 / -	5	Partial capture
08-01 18:10	80m	-7 / -	R4FDD	-7 / -3	3	✓ Closing observed
07-10 18:49	20m	-13 / -14	CN2DX	+1 / -6	2	Partial capture
07-07 20:08	80m	-1 / +3	R2SDZ	+7 / -	6	✓ Closing observed
07-07 20:08	80m	-1 / -2	UA3ATQ	-17 / -5	7	✓ Full exchange observed
07-07 20:05	80m	0 / -6	IK2HNG	-9 / -18	4	✓ Full exchange observed
07-07 20:04	80m	-4 / -5	EW3FH	+9 / -5	4	✓ Full exchange observed
07-07 20:03	80m	-5 / +5	YL3KZ	0 / -7	5	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
210015 -10 1327  R8CC RX4CK 73
210045  -7 1327  R4HLO RX4CK -02 (x2)
210145 -10 1327  CQ RX4CK LO11 (x3)
210300  -4 1327  RX4CK DO2HC JO50
210315 -10 1327  CQ RX4CK LO11 (x3)
210430 -16 1327  RX4CK DO2HC JO50
210445 -10 1327  CQ RX4CK LO11 (x4)

40m

UTC    dB Audio  Message
163700 -15 2256  RX4CK R50RKZ R+00
163730 -14 2256  RX4CK RR73; UA1AEL <...> +16
142030  -6  823  CQ RX4CK LO11 (x2)
142130  -8  823  RW3ZR RX4CK -09 (x2)
142300  -8  823  CQ RX4CK LO11 (x2)
142345 -15 2245  RX4CK UA4FOH LO13
142400 -13  823  UA4FOH RX4CK -08
142415  -8 2246  RX4CK UA4FOH R-21
142430 -10  823  UA4FOH RX4CK RR73
142445 -14 2246  RX4CK UA4FOH 73
142500 -10  823  UB4HPQ RX4CK -06 (x2)

20m

UTC    dB Audio  Message
184915 -13  804  CN2DX RX4CK -06
184930  +1 1779  RX4CK CN2DX R-14
083545  +7 2546  <...> RX4CK -07

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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