UB4CLH — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO22

Receiver-side FT8 activity involving UB4CLH, decoded by SO8OO in southeastern Poland. 918 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 59 UTC dates in the available aggregate history. Observed between 2026-06-21 and 2026-10-21.

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 918 FT8 messages attributed to UB4CLH as the transmitting token by decoded message structure across 59 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (43%), followed by 40 m (35%) and 20 m (22%). Most decodes (96%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15.3 dB.

Overview

918

Messages attributed

UTC dates decoded

213

Active 15-min windows

-15.3 dB

Estimated median S/N

Bands

80m · 393 40m · 324 20m · 201

First attributed message: 2026-06-21
Last attributed message: 2026-10-21 18:26 UTC

Observed FT8 message patterns

Attributed sample: 918 messages
Active dates: 59 UTC dates
Estimated median S/N: -15.3 dB
Estimated 10th-90th percentile: -22 to -5.7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 455, moderate (-15 to -9 dB) 300, strong (≥ -8 dB) 163.

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 UB4CLH in decoded directed-looking exchanges:

RI1FJL · Franz Josef Land ×3 R2APC · European Russia ×3 R5BS · European Russia ×2 RA9MI · Asiatic Russia ×2 R1AV · European Russia ×2 R2EA/P · European Russia ×2 R5AV · European Russia ×2 R9FAK · European Russia ×2 RA3PGR · European Russia ×2 RC6OG · European Russia ×2 RC9WC · Asiatic Russia ×2 RD6OX · European Russia ×2

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 UB4CLH

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: LO22 · 231 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,634 km (approx.)
Last such locator decoded: 2026-10-17 17:25 UTC

Other locator fields attributed to this token: LO21 (2).

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	UB4CLH S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-21 18:26	80m	-19 / -13	RN3YN	-8 / -	3	✓ Closing observed
10-21 15:21	80m	- / -13	OH7UE	+4 / -	2	✓ Closing fragment
10-21 15:11	80m	- / -23	HA7XL	+10 / -	2	✓ Closing fragment
10-21 15:06	80m	- / -11	R6HV	-8 / -	2	✓ Closing fragment
10-21 15:03	80m	- / -13	UA3UGW	+3 / -	2	✓ Closing fragment
10-18 16:03	80m	- / -4	R3VE	-6 / -	2	✓ Closing fragment
10-18 16:01	80m	- / -3	RA3ST	-6 / -	3	✓ Closing fragment
10-18 15:58	80m	- / -9	R8CA	-21 / -	2	✓ Closing fragment
10-17 17:46	40m	-10 / -	RA6BL	-5 / -	2	✓ Closing observed
10-17 17:38	40m	- / -3	HA1BF	+3 / -	2	✓ Closing fragment
10-17 17:24	40m	-13 / -11	UA9SHH	-5 / -	4	✓ Closing observed
10-17 14:18	40m	- / +4	RV3DBV	-9 / -	2	✓ Closing fragment
10-17 14:16	40m	- / -11	9A3K	+18 / -	4	✓ Closing fragment
10-17 14:12	40m	- / -	DJ0MAB	-11 / -	3	Partial capture
10-17 14:10	40m	- / 0	R3MBV	-12 / -	2	✓ Closing fragment
10-17 06:56	40m	- / +1	RD3WW	-4 / -	2	✓ Closing fragment
10-17 06:49	40m	- / +3	RX3AEX	-11 / -	3	✓ Closing fragment
10-16 19:05	40m	- / -1	IV3NDR	-18 / -	2	Partial capture
10-16 19:05	40m	- / -	F4BYA	+4 / -	3	Partial capture
10-16 16:41	40m	- / -8	RZ6L	+6 / -	2	✓ Closing fragment
10-16 16:34	40m	- / -	DJ0MAB	+8 / -	4	Partial capture
10-16 16:32	40m	-22 / -12	RA6KR	-8 / -	3	✓ Closing observed
10-16 16:26	40m	- / -	DJ0MAB	-3 / -	3	Partial capture
10-16 16:19	40m	-17 / -8	R1AV	-13 / -8	4	✓ Full exchange observed
10-16 16:01	40m	-19 / -8	R6YG	-3 / -6	3	✓ Full exchange observed
10-15 17:03	80m	-24 / -	R9CS/P	- / +1	2	Partial capture
10-15 16:58	80m	- / -9	R3BCL	-18 / -	2	Partial capture
10-13 15:29	40m	- / -	PA0WDN	-16 / -	2	Partial capture
10-13 15:25	40m	- / -	PA0WDN	-15 / -	3	Partial capture
10-13 15:13	40m	- / -	PA0WDN	-16 / -	2	Partial capture
10-07 16:59	80m	-23 / -7	UA1CKA	+5 / -10	3	✓ Full exchange observed
10-07 16:57	80m	- / -6	R2SN	-4 / -	2	✓ Closing fragment
10-07 16:56	80m	- / -6	RU3OH	-13 / -	2	Partial capture
10-07 16:56	80m	- / -8	RA5AK	-2 / -	2	✓ Closing fragment
10-07 16:55	80m	- / +2	R4DS	-9 / -	2	✓ Closing fragment
10-07 15:41	80m	- / -16	RA1TR	+1 / -	7	✓ Closing fragment
10-07 14:53	80m	- / -	RA3UEV	-4 / -	2	✓ Closing fragment
10-06 17:06	80m	- / +6	RY4C	-8 / -	2	✓ Closing fragment
10-06 16:36	40m	- / -2	DB2OE	+10 / -	5	✓ Closing fragment
10-06 16:34	40m	- / -26	RW1CW	-14 / -	2	Partial capture
10-06 15:58	40m	- / -15	9A7BB	-4 / -	2	✓ Closing fragment
10-04 16:58	80m	- / -15	RA3WY	0 / -	4	✓ Closing fragment
10-04 16:54	80m	-15 / -2	R3DPZ	+2 / -10	3	Partial capture
10-04 15:47	40m	- / -12	R3DMX	-12 / -	2	✓ Closing fragment
10-04 15:42	40m	- / -	DG9FEH	-13 / -	7	Partial capture
10-04 15:38	40m	- / -	DL1EFX	-18 / -	2	Partial capture
10-04 15:37	40m	-19 / -	R8ACF	-15 / -12	2	Partial capture
10-04 13:57	40m	- / -4	R6LI	-15 / -	3	✓ Closing fragment
10-04 13:55	40m	- / -5	RK3YWS/P	-8 / -	2	✓ Closing fragment
10-04 13:54	40m	- / +5	UA3IDQ	-4 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
160200  -4  815  UB4CLH RA3ST 73
160330  -5  940  UB4CLH R3VE R-04 (x2)
150330  -1 2522  UB4CLH UA3UGW R-13 (x2)
150630  -9 1253  UB4CLH R6HV R-11 (x2)
151145 +11 1791  UB4CLH HA7XL R-23 (x2)
152145  +2 1838  UB4CLH OH7UE R-13 (x2)
181245 -12 1960  UB4CLH R7KJM R-12
182600  -9  698  UB4CLH RN3YN R-13
182615 -19 1624  RN3YN UB4CLH RR73
182630  -8  698  UB4CLH RN3YN 73

40m

UTC    dB Audio  Message
141915 -13  735  UB4CLH RV3DBV 73
172400  -5 2473  UB4CLH UA9SHH R-11 (x2)
172445 -13 2399  UA9SHH UB4CLH RR73
172500  -4 2473  UB4CLH UA9SHH 73
172545 -13 2399  CQ UB4CLH LO22
172615 -14 2399  R1BMZ UB4CLH -07
173230  -1 2400  UB4CLH OH3MB R-03
173315 -14 2400  RA4ADF/P UB4CLH -11
173600 -14 1716  UB4CLH EX7CQ R-04
173800  +4 1419  UB4CLH HA1BF R-03 (x2)
174030 -16 2021  UB4CLH EU6UE R+09
174615 -10 1830  RA6BL UB4CLH RR73
174630  -5 1830  UB4CLH RA6BL 73

20m

UTC    dB Audio  Message
165245 -10 2285  BG7BMG UB4CLH -18 (x2)
165345  -9 2285  CQ UB4CLH LO22 (x4)
165615  -7 1915  EP2AES UB4CLH -17
165645  -9 1915  YO7VNS UB4CLH -13 (x2)
165745  -9 1915  EP2AES UB4CLH -12 (x2)
165845 -11 1915  SQ5PTZ UB4CLH -06 (x2)
170145 -11 1915  EP2AES UB4CLH -11
170215  -7 1915  CQ UB4CLH LO22

10m

UTC    dB Audio  Message
073615 -20 2091  UB4CLH UA4FKT LO23 (x2)
081730  +2 2641  UB4CLH F1PBZ -18 (x3)

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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