UA4SN — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO36

Receiver-side FT8 activity involving UA4SN, decoded by SO8OO in southeastern Poland. 531 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 30 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-09-20.

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 531 FT8 messages attributed to UA4SN as the transmitting token by decoded message structure across 30 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (43%), followed by 40 m (26%) and 80 m (16%). Most decodes (92%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13.4 dB.

Overview

531

Messages attributed

UTC dates decoded

Active 15-min windows

-13.4 dB

Estimated median S/N

Bands

160m · 80 80m · 85 40m · 139 20m · 227

First attributed message: 2026-06-10
Last attributed message: 2026-09-20 19:06 UTC

Observed FT8 message patterns

Attributed sample: 531 messages
Active dates: 30 UTC dates
Estimated median S/N: -13.4 dB
Estimated 10th-90th percentile: -21 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 214, moderate (-15 to -9 dB) 186, strong (≥ -8 dB) 131.

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 UA4SN in decoded directed-looking exchanges:

RN3TT · European Russia ×2 UA3ON · European Russia ×2 E70SZ · Bosnia-Herzegovina ×2 RW3XB · European Russia ×2 R9FAK · European Russia ×2 RW2Z · European Russia ×2 UB3AMO · European Russia ×2 A41ZZ · Oman CR7BRV · Portugal DD7EE · Fed. Rep. of Germany F1PBZ · France F4FSY · France

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 UA4SN

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: LO36 · 273 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,817 km (approx.)
Last such locator decoded: 2026-09-20 19:06 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	UA4SN S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 18:48	160m	- / -13	RU6C	+5 / -	2	✓ Closing fragment
09-20 18:45	160m	- / -1	RA3ZH	-13 / -	2	Partial capture
09-20 18:38	80m	-11 / -	RU9CK	- / +3	3	✓ Closing fragment
09-20 18:32	80m	-9 / -17	DO6MFD	-14 / -	3	Partial capture
09-20 18:28	40m	- / -12	PA7D	-10 / -	2	✓ Closing fragment
09-20 18:22	40m	-9 / -	PD4RJ	- / -22	3	✓ Closing fragment
09-20 18:13	40m	-9 / -10	ON1DGN	-6 / -16	5	✓ Full exchange observed
09-20 18:11	40m	-10 / -	RV3X	-8 / +2	3	✓ Closing observed
09-20 18:07	40m	-12 / -	TC2EYL	-1 / -	2	✓ Closing observed
09-20 18:01	40m	-10 / -19	E77TT	-6 / -14	4	✓ Full exchange observed
09-18 20:08	160m	-24 / -7	RV3V	-10 / -	3	✓ Closing observed
09-16 18:56	160m	- / -8	RN3TT	-9 / -	5	✓ Closing fragment
09-16 18:53	160m	- / -6	R3SV	-2 / -	3	✓ Closing fragment
09-16 18:42	160m	- / -19	RW4CB	-2 / -	2	✓ Closing fragment
09-16 18:29	160m	- / -	RN3TT	-10 / -	3	Partial capture
09-16 18:08	160m	- / -21	OM3SX	+9 / -	3	Partial capture
09-16 18:02	160m	- / -	OM3SX	+6 / -	2	Partial capture
09-16 18:00	160m	- / -	RC2DD	-22 / -	2	✓ Closing fragment
09-16 17:51	80m	-22 / -	UA3ON	- / -7	3	✓ Closing fragment
09-16 17:47	80m	-10 / -	R3BCL	-22 / -1	2	✓ Closing observed
09-16 17:17	80m	-19 / -	UN7CFG	- / -14	2	✓ Closing fragment
09-16 17:03	80m	-12 / -1	R3YAR	+7 / -7	4	✓ Full exchange observed
09-16 17:01	80m	- / -16	OM1II	-6 / -	2	✓ Closing fragment
09-16 16:50	80m	- / -1	R3KLE	0 / -	3	✓ Closing fragment
09-16 16:42	80m	- / -6	RW2Z	+5 / -	3	✓ Closing fragment
09-11 17:31	80m	-7 / -	UB6OAJ	-8 / -9	3	✓ Closing observed
09-11 17:23	160m	- / -13	R6LNH	-8 / -	4	Partial capture
09-11 17:20	160m	- / -11	R2DRE	-16 / -	3	✓ Closing fragment
09-11 17:18	160m	- / -17	RA3X	-19 / -	3	Partial capture
09-11 17:07	80m	-8 / -	R1AV	- / -	2	Partial capture
09-11 16:33	80m	-8 / -	RA9YTI	-21 / -1	3	✓ Closing observed
09-08 09:04	40m	- / +4	R3PA	-10 / -	2	Partial capture
09-01 20:32	160m	- / -	OM3PC	+19 / -	2	Partial capture
09-01 20:13	160m	- / +1	RN3TT	+4 / -	4	✓ Closing fragment
08-31 18:02	160m	- / -17	UA3ZNQ	-5 / -	3	✓ Closing fragment
08-31 17:49	160m	- / -14	RM5F	-10 / -	2	Partial capture
08-31 17:41	80m	-15 / -	RL7Z	- / -	4	✓ Closing fragment
08-30 20:01	160m	- / -13	EI2CN	-1 / -	2	✓ Closing fragment
08-30 19:53	160m	- / -17	UA1ANA	-11 / -	3	✓ Closing fragment
08-30 19:50	160m	-24 / -11	SQ1X	+1 / -	3	Partial capture
08-30 19:47	160m	-22 / -15	RK6C	-10 / -13	5	✓ Full exchange observed
08-30 19:43	160m	-16 / -7	SP3BPU	+10 / -10	3	Partial capture
08-30 19:41	160m	-19 / -8	R3PA	-14 / -3	5	✓ Full exchange observed
08-30 19:27	160m	-23 / -14	SP5UFK	+2 / -	3	✓ Closing observed
08-29 19:53	160m	-16 / -	LX1NO	+5 / -14	6	Partial capture
08-29 19:47	160m	-20 / -3	R2BRU	-20 / -3	6	✓ Full exchange observed
08-29 19:46	160m	-20 / -	RW0AR	- / -	3	Partial capture
08-29 19:36	160m	-17 / -15	DA0RR	+2 / -16	5	✓ Full exchange observed
08-29 19:34	160m	-22 / -	RA3TOS	- / -17	2	✓ Closing fragment
08-29 19:33	160m	-19 / -20	PA3FR	-7 / -15	5	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
185630  -5 2428  UA4SN RN3TT LO16 (x4)
200715 -24 1948  UA4SN R4DD -06
200845 -12  559  UA4SN RV3V R-07
200900 -24 1622  RV3V UA4SN RR73
200915  -7  559  UA4SN RV3V 73
202415 -24 1624  CQ UA4SN LO36
184515  -9  393  UA4SN RA3ZH KO81 (x2)
184815  +8  439  UA4SN RU6C -13 (x2)
185230 -22 1624  CQ UA4SN LO36
190645 -23 1623  RI1FJZ UA4SN LO36

80m

UTC    dB Audio  Message
174715 -22 1879  UA4SN R3BCL RR73
175115 -24 1631  UA3ON UA4SN LO36 (x3)
183200  -9 1631  DO6MFD UA4SN LO36
183245 -11 1503  UA4SN DO6MFD -17
183300 -13 1631  UA0TP UA4SN -09
183315 -17 1504  UA4SN DO6MFD -17
183600 -11 1630  CQ UA4SN LO36
183800 -13 1631  RU9CK UA4SN LO36 (x3)
183930 -10 1631  CQ UA4SN LO36 (x2)
184130 -10 1631  DJ9WJ UA4SN LO36

40m

UTC    dB Audio  Message
181330  -6 1587  UA4SN ON1DGN -10
181345 -15 1667  SP100PKP UA4SN -09
181400  -5 1587  UA4SN ON1DGN -10 (x2)
181445  -9 1667  ON1DGN UA4SN R-16
181500  -6 1587  UA4SN ON1DGN RR73
181630  -7 1667  UI6O UA4SN LO36
182030  -8 2063  UA4SN 3Z100PKP +00
182045 -10 1667  RV6G/QRP UA4SN R-06
182245 -10 1667  PD4RJ UA4SN LO36 (x3)
182800 -12 1666  UA4SN PA7D R-12 (x2)
182945  -6 1667  CQ UA4SN LO36

20m

UTC    dB Audio  Message
182045 -18 1632  UA4SN ON1DGN -03
182100 -13 1753  PA7RW UA4SN -16
182115 -16 1632  UA4SN ON1DGN -03
182130 -17 1753  PA7RW UA4SN RR73
182145 -21 1632  UA4SN ON1DGN -03
182200  -7 1754  YO9CX UA4SN R+01
183730 -15 1813  CQ UA4SN LO36 (x3)
170430  -6 2471  UA4SN M1WLK IO82 (x3)
170815 -10 1587  UA4SN UC7T LN05 (x3)

10m

UTC    dB Audio  Message
094730  -6 2115  UA4SN US1EA KN78 (x3)
094930 -11 1375  UA4SN R6MO +07
095100  -9  934  UA4SN RA5AK RR73
095200 -10 2115  UA4SN DL3NGN JN59 (x2)
100445  -5  333  UA4SN RJ6ON -07
194930 -19 1160  UA4SN DD7EE 73
173730  +0 2833  UA4SN F1PBZ -12 (x2)
183300 -14 1483  UA4SN EB5HRZ IM99 (x3)
102400 -15  923  UA4SN A41ZZ 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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