UB4CJV — 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: LO31

Receiver-side FT8 activity involving UB4CJV, decoded by SO8OO in southeastern Poland. 147 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 7 UTC dates in the available aggregate history. Observed between 2026-07-05 and 2026-08-16.

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 147 FT8 messages attributed to UB4CJV as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (62%), followed by 40 m (38%). Several six-hour UTC windows tied for the largest share (99%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

147

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

40m · 56 20m · 91

First attributed message: 2026-07-05
Last attributed message: 2026-08-16 22:12 UTC

Observed FT8 message patterns

Attributed sample: 147 messages
Active dates: 7 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -19 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 39, moderate (-15 to -9 dB) 40, strong (≥ -8 dB) 68.

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 UB4CJV in decoded directed-looking exchanges:

CR5VP · Portugal ×2 A41ZZ · Oman BG7BMG · China BH4ECL · China BU2FW · Taiwan DH2RL · Fed. Rep. of Germany G8IXM · England JF2HPA · Japan LA8ENA · Norway MI0JZZ · Northern Ireland RL2F · Kaliningrad S52BT · Slovenia

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 UB4CJV

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: LO31 · 54 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,774 km (approx.)
Last such locator decoded: 2026-08-15 19:51 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	UB4CJV S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-01 14:54	40m	- / -21	RA6BL	-7 / -	4	✓ Closing fragment
10-28 21:02	40m	- / -17	ES6RQ	0 / -	2	✓ Closing fragment
10-16 23:44	40m	- / -16	UN7PPV	-17 / -	3	Partial capture
08-16 22:02	40m	-17 / -	YO2CIP	-8 / -20	2	Partial capture
08-16 21:58	40m	- / -3	PE1NAO	-24 / -	2	✓ Closing fragment
08-16 21:54	40m	-16 / -	EG5DX	- / -21	2	Partial capture
08-16 21:40	40m	- / -4	UA2KU	0 / -	2	✓ Closing fragment
08-16 21:20	40m	- / +5	DL7ARV	-2 / -	4	✓ Closing fragment
08-15 19:43	20m	-9 / -	CS8ABF	- / -	3	Partial capture
08-15 19:39	20m	-6 / -	CS8ABF	- / -23	2	Partial capture
08-15 19:29	20m	-9 / -	RL2F	- / -	2	✓ Closing fragment
08-15 19:27	20m	- / -	F4BJN	-8 / -	2	Partial capture
08-15 19:19	20m	-11 / -11	CR5VP	-13 / -	5	✓ Closing observed
08-15 19:16	20m	-13 / -8	LA8ENA	-4 / -	4	✓ Closing observed
08-15 19:14	20m	-6 / -	9J2FI	- / -	3	Partial capture
08-15 17:10	20m	- / -10	S52BT	+7 / -	5	✓ Closing fragment
08-14 19:43	20m	-2 / -	BA5AN	- / -22	8	Partial capture
08-14 19:41	20m	-6 / -	JF2HPA	- / -5	3	✓ Closing fragment
08-14 19:40	20m	-6 / -	R2FBW	- / -4	2	Partial capture
08-14 19:38	20m	-6 / -	DH2RL	- / -22	2	✓ Closing fragment
08-14 19:35	20m	-7 / -14	MI0JZZ	-9 / -2	4	✓ Full exchange observed
08-14 19:29	20m	-5 / -	SQ9CXH	- / -6	7	Partial capture
08-14 19:24	20m	-6 / -	PT7AZ	- / -16	6	Partial capture
08-14 19:22	20m	-5 / -	BU2FW	- / -21	5	✓ Closing fragment
08-14 19:18	20m	-1 / -	DL1BBO	- / -5	2	Partial capture
08-14 19:17	20m	-2 / -	BG7BMG	- / -	2	✓ Closing fragment
08-14 19:15	20m	-7 / -	G8IXM	- / -23	3	✓ Closing fragment
08-14 19:13	20m	-6 / -	BH4ECL	- / -14	2	✓ Closing fragment
08-14 19:10	20m	-6 / -	XU7O	- / -13	5	✓ Closing fragment
08-14 19:05	20m	-6 / -	<...>	- / -	6	Partial capture
08-14 19:00	20m	-6 / -	3A2MW	- / -	4	Partial capture
08-14 18:57	20m	-12 / -	A41ZZ	- / -6	3	✓ Closing fragment
08-11 20:56	40m	-11 / -	R4NBV	- / -12	4	Partial capture
08-11 20:40	40m	-16 / -	DL7ACA	-12 / -20	3	Partial capture
08-11 20:35	40m	-17 / -	OZ5AGJ	-20 / -	3	✓ Closing observed
08-11 20:35	40m	-13 / 0	RM5F	-13 / -	7	✓ Full exchange observed
08-11 20:30	20m	-14 / -	OE7LVI	- / -11	2	Partial capture
08-11 20:29	20m	-19 / -1	SP6AXW	-8 / -	4	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
220200 -17  855  YO2CIP UB4CJV R-20
220215  -8  489  UB4CJV YO2CIP RRR
221015 -15 1412  UB4CJV F1HFP RR73
221200 -16  856  RX3ASQ UB4CJV R-02
234430 -18 1694  UB4CJV UN7PPV -16 (x3)
234530  -7 1976  UB4CJV UA4CCH R-18
230730  -6 2519  UB4CJV EK/RX3DPK -19
210230  -2 2918  UB4CJV ES6RQ -17 (x2)
145415  -4 2339  UB4CJV RA6BL -21 (x4)

20m

UTC    dB Audio  Message
192715  -7  894  UB4CJV F4BJN JN25 (x2)
192900  -8  893  RL2F UB4CJV LO31 (x2)
193345  -9 1115  UB4CJV CS8ABF -19
193630  -2  893  CS8ABF UB4CJV R-23
193800  -4  893  9J2FI UB4CJV LO31
193930  -7  893  CS8ABF UB4CJV R-23 (x6)
195115 -10 2711  UB4CJV EA3BIC JN11
195115 -11  893  CS8ABF UB4CJV LO31

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

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee