UB4HVA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO53

Receiver-side FT8 activity involving UB4HVA, decoded by SO8OO in southeastern Poland. 1,838 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 35 UTC dates in the available aggregate history. Observed between 2026-06-11 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 1,838 FT8 messages attributed to UB4HVA as the transmitting token by decoded message structure across 35 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (66%), followed by 40 m (34%). Most decodes (50%) 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 -11 dB.

Overview

1,838

Messages attributed

UTC dates decoded

400

Active 15-min windows

-11 dB

Estimated median S/N

Bands

40m · 619 20m · 1,219

First attributed message: 2026-06-11
Last attributed message: 2026-09-12 17:19 UTC

Observed FT8 message patterns

Attributed sample: 1,838 messages
Active dates: 35 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -19 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 461, moderate (-15 to -9 dB) 689, strong (≥ -8 dB) 688.

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 UB4HVA in decoded directed-looking exchanges:

LZ1BT · Bulgaria ×3 R6FFB · European Russia ×2 RZ5D · European Russia ×2 R2EN · European Russia ×2 UA4FKT · European Russia ×2 R3OR · European Russia ×2 UA3FO · European Russia ×2 RA3WY · European Russia ×2 RX3RZ · European Russia ×2 RX7T · European Russia ×2 UA3GJM · European Russia ×2 UI5A · 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 UB4HVA

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: LO53 · 1,000 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,036 km (approx.)
Last such locator decoded: 2026-09-12 17:19 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	UB4HVA S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 17:44	40m	- / -12	OZ1KZX	+2 / -	2	✓ Closing fragment
09-12 17:19	40m	-10 / -	R3VE	-15 / -9	3	✓ Closing observed
09-12 17:17	40m	- / -22	UB3FBD	-10 / -	3	✓ Closing fragment
09-12 17:15	40m	- / 0	RW3PI	-4 / -	2	✓ Closing fragment
09-12 16:29	40m	-15 / +5	RX3RZ	+2 / +2	5	✓ Full exchange observed
09-12 16:27	40m	-13 / -	UB8CQJ	- / -	3	Partial capture
09-12 16:20	40m	-16 / -9	UA3PY	+1 / -	3	✓ Closing observed
09-12 16:00	40m	- / +2	RO3R	+2 / -	2	✓ Closing fragment
09-12 15:55	40m	- / -6	RK6DD	+2 / -	2	✓ Closing fragment
09-12 15:37	40m	-16 / -10	EW8KO	-2 / -11	3	✓ Full exchange observed
09-12 15:32	40m	-15 / 0	R7MN	-3 / -3	6	✓ Full exchange observed
09-12 15:29	40m	-7 / -	RK0UN	- / -	2	Partial capture
09-12 15:23	40m	-18 / -	R3UCC/P	-24 / -13	4	✓ Closing observed
09-12 15:21	40m	-16 / +4	RD6OX	+8 / +5	3	✓ Full exchange observed
09-12 15:20	40m	-14 / -	RZ6BS	- / -2	2	✓ Closing fragment
09-12 14:16	40m	- / -14	YO4BXX	+3 / -	3	✓ Closing fragment
09-12 14:10	40m	- / +2	RA7E/P	-14 / -	3	✓ Closing fragment
09-12 04:42	40m	- / -5	RU3KO	-2 / -	2	✓ Closing fragment
09-11 21:39	40m	-16 / -14	UI6A	+6 / -	3	✓ Closing observed
09-11 21:28	40m	-16 / -	RK3QA	- / -	2	Partial capture
09-11 21:16	40m	-17 / -13	CT7AXN	-9 / -	3	✓ Closing observed
09-11 20:09	40m	- / +2	TF4M	-8 / -	2	✓ Closing fragment
09-11 19:00	40m	-18 / -8	R7KEO	-6 / -	3	✓ Closing observed
09-11 18:45	40m	-20 / +10	RA1QY	+2 / -	4	✓ Closing observed
09-11 18:42	40m	-16 / -17	RU3T	-2 / -	3	✓ Closing observed
09-11 17:41	40m	-13 / -	R6ZAJ	- / -8	3	✓ Closing fragment
09-11 17:38	40m	- / -4	R2DVU	-16 / -	2	✓ Closing fragment
09-11 17:35	40m	-14 / -	RA4AID	-13 / -12	3	✓ Closing observed
09-11 16:43	40m	-18 / -	UD3T	- / -14	3	✓ Closing fragment
09-11 16:40	40m	-15 / -8	RD4F	+4 / -7	6	✓ Full exchange observed
09-11 16:35	40m	- / -1	UA3DNK	-6 / -	2	✓ Closing fragment
09-11 16:29	40m	- / -14	RU4I	-4 / -	3	✓ Closing fragment
09-11 16:28	40m	-17 / -	RY3D	+12 / -	2	✓ Closing observed
09-11 16:25	40m	-19 / -15	RW9WJ	-9 / -15	5	✓ Full exchange observed
09-11 16:25	40m	-17 / +2	RW3QJA	0 / -	4	✓ Closing observed
09-11 16:22	40m	-14 / -	R3UAF	- / -3	2	✓ Closing fragment
09-11 16:21	40m	-16 / -	RN6AK	- / -	2	Partial capture
09-11 15:05	40m	-18 / -	R8HC/P	- / -12	2	Partial capture
09-11 15:02	40m	- / +1	R9CS/P	-12 / -	2	✓ Closing fragment
09-11 14:48	40m	- / -	UA4COA	-8 / -	2	Partial capture
09-11 13:20	40m	- / -15	RK6AH	-6 / -	2	✓ Closing fragment
09-06 17:23	40m	-11 / -5	UB3YCK	+1 / -	2	Partial capture
09-06 17:18	40m	-13 / -	RU3GF	- / -12	3	✓ Closing fragment
09-06 17:16	40m	-10 / -	RD9M/3	- / -12	2	Partial capture
09-06 16:58	40m	-7 / -2	RU6CH	+5 / -8	4	✓ Full exchange observed
09-06 16:56	40m	-10 / -	UA1ALY	- / -	4	✓ Closing fragment
09-06 16:50	40m	-10 / -	R3LCU	0 / -9	3	✓ Closing observed
09-06 16:47	40m	-12 / -11	SV2RYU	-6 / -9	5	✓ Full exchange observed
09-06 16:42	40m	-9 / -3	UA3FO	-4 / +2	4	✓ Full exchange observed
09-06 16:25	40m	-6 / -	R4FCK	- / -6	10	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
162900 -16 2335  RX3RZ UB4HVA LO53
162915  +3  390  UB4HVA RX3RZ +05
162930 -15 2335  RX3RZ UB4HVA R+02
162945  +0  390  UB4HVA RX3RZ RR73
163000 -15 2335  RX3RZ UB4HVA 73
171530  -7  869  UB4HVA RW3PI +00 (x2)
171730 -10 2480  UB4HVA UB3FBD KO85 (x3)
171900  -9 2479  R3VE UB4HVA LO53 (x2)
171945 -15 1352  UB4HVA R3VE RR73
174400  +1  387  UB4HVA OZ1KZX -12 (x2)

20m

UTC    dB Audio  Message
161915 -17 1740  US7KC UB4HVA LO53
165615  -7 1739  SQ5PTZ UB4HVA R-10 (x2)
165715  -4 1739  LZ1WV UB4HVA LO53 (x3)
170000  +5  628  UB4HVA M8GGQ -04 (x2)
170145 -11 1740  R7OV UB4HVA LO53
170445 -17 1472  UB4HVA IU1DXU -06 (x3)
170600 -12 1739  IU1DXU UB4HVA R-04
170615  -8 1473  UB4HVA IU1DXU RR73
170630  -9 1739  IU1DXU UB4HVA 73

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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