UA4HDB — 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 UA4HDB, decoded by SO8OO in southeastern Poland. 150 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 17 UTC dates in the available aggregate history. Observed between 2026-06-08 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 150 FT8 messages attributed to UA4HDB as the transmitting token by decoded message structure across 17 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (37%), followed by 20 m (31%) and 160 m (18%). Several six-hour UTC windows tied for the largest share (72%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.

Overview

150

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

160m · 27 80m · 55 40m · 22 20m · 46

First attributed message: 2026-06-08
Last attributed message: 2026-09-20 18:08 UTC

Observed FT8 message patterns

Attributed sample: 150 messages
Active dates: 17 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -21 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 59, moderate (-15 to -9 dB) 41, strong (≥ -8 dB) 50.

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 UA4HDB in decoded directed-looking exchanges:

R6ML · European Russia ×2 R6LKG · European Russia RZ3ZY · European Russia UA6BGM · European Russia R2EA · European Russia R3PA · European Russia RA3WY · European Russia RD6OZ · European Russia RG7O · European Russia RN7A · European Russia UA6HFI · European Russia UD8S · Asiatic 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 UA4HDB

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 · 80 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,036 km (approx.)
Last such locator decoded: 2026-09-20 18:08 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	UA4HDB S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 18:06	160m	-22 / -	RI1FJZ	- / -	3	Partial capture
09-12 18:32	80m	-8 / -	SP5KUNA	- / -8	2	Partial capture
09-12 17:21	80m	- / -	R3PLA	-16 / -	4	Partial capture
09-12 17:19	80m	-9 / -	UB3ADO/P	- / -11	3	Partial capture
09-08 16:48	80m	- / -8	RD7LO	-7 / -	2	Partial capture
09-08 15:42	80m	-12 / -	RA6LTD	-9 / -11	5	✓ Full exchange observed
09-08 15:41	80m	-10 / +2	R4UA	-4 / +7	5	✓ Full exchange observed
09-08 15:41	80m	- / -	RX1AB	-19 / -	2	Partial capture
09-08 15:41	80m	-11 / -	RW0AE	- / -24	3	Partial capture
09-08 15:40	80m	-10 / -	UA9LT	- / +3	2	✓ Closing fragment
09-08 15:38	80m	-10 / -	UA0TP	- / -15	3	✓ Closing fragment
09-08 15:17	40m	- / -	G6ZRV	-4 / -	2	Partial capture
09-08 15:14	40m	- / -16	OZ1GXW	-9 / -	4	Partial capture
09-08 15:13	40m	+4 / -2	R6ML	-6 / -4	4	✓ Full exchange observed
09-08 15:12	40m	-4 / -	UC6Y	- / +2	2	✓ Closing fragment
09-04 19:49	160m	-12 / -13	R3PA	-13 / -	4	✓ Closing observed
09-04 19:40	160m	-20 / -	R6JY	- / -	3	Partial capture
09-04 19:37	160m	-14 / -5	RD6OZ	-8 / -	3	✓ Closing observed
09-04 19:36	160m	- / -12	OK1FRG	+14 / -	5	Partial capture
09-04 19:35	160m	-18 / -9	RG7O	+4 / 0	3	✓ Full exchange observed
09-04 19:30	160m	-20 / -4	UA6HFI	-9 / +10	4	✓ Full exchange observed
09-04 19:25	160m	-16 / -6	R2EA	-4 / -1	4	✓ Full exchange observed
08-30 16:25	80m	-6 / -	R6LQG	-15 / -1	4	✓ Closing observed
08-30 16:24	80m	-12 / -	RN6OX	-4 / +10	3	✓ Closing observed
08-28 19:57	160m	-22 / -	OI5AY	- / -	2	Partial capture
08-28 19:48	160m	-22 / -2	OH5CY	-14 / -	6	Partial capture
08-28 19:45	160m	-22 / -2	RA3WY	-2 / -	4	✓ Closing observed
08-28 14:33	20m	-11 / -7	EX7DY	-1 / -8	5	✓ Full exchange observed
08-15 17:08	80m	- / -	EU6KA	-14 / -	6	Partial capture
08-15 17:08	80m	- / -	R2DGN	+4 / -	2	Partial capture
08-15 17:03	80m	-20 / -5	R3BDQ	+3 / -3	4	✓ Full exchange observed
08-15 17:03	80m	- / -	EU6KA	-13 / -	3	Partial capture
08-15 17:03	80m	-19 / +1	R6ML	-8 / +8	8	✓ Full exchange observed
08-15 17:00	80m	-20 / -	RA9UFJ	- / +3	3	✓ Closing fragment
08-15 15:39	20m	-8 / -	RI0FA	- / -5	3	Partial capture
08-14 20:23	80m	+10 / -	R3WDW/P	- / -12	8	✓ Closing fragment
08-14 20:14	160m	- / +3	R7NO	-7 / -	2	Partial capture
08-14 20:11	160m	-21 / -	R0QBB/3	- / +5	3	Partial capture
08-14 18:16	80m	-3 / -6	R6DOB/7	-16 / -	9	Partial capture
08-02 08:55	20m	-19 / -1	UA1AEL	-7 / +4	4	✓ Full exchange observed
08-02 08:51	20m	-20 / -8	RN6LBT	-18 / -	3	✓ Full exchange observed
08-02 08:49	20m	- / -	EB3JT	-20 / -	2	✓ Closing fragment
07-16 07:31	20m	-17 / -	RG1L	- / -17	2	Partial capture
07-16 07:30	20m	-18 / -	RO2E/M	- / -	2	Partial capture
07-16 07:29	20m	-16 / -	<...>	- / -	2	Partial capture
07-16 05:48	20m	-20 / -	OK2SBI	- / -8	2	Partial capture
07-16 05:47	20m	-16 / -	R5AV	- / +1	2	✓ Closing fragment
07-05 12:10	20m	-15 / -	RW3RN	- / -	3	Partial capture
07-05 12:06	20m	-14 / -	UN8DSW	- / -	2	Partial capture
07-02 16:42	10m	- / -19	UA6BGM	-3 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
193800  -7 1193  UA4HDB RD6OZ -05 (x2)
193900 +17 2725  UA4HDB OK1FRG R-12 (x3)
194030 -24 1950  R6JY UA4HDB LO53 (x3)
194915 -13 1408  UA4HDB R3PA -13
194930 -12 1928  R3PA UA4HDB LO53
194945 -10 1409  UA4HDB R3PA -10 (x2)
180615 -24 1409  RI1FJZ UA4HDB LO53 (x3)

80m

UTC    dB Audio  Message
154430 -11 1944  RA6LTD UA4HDB R-11
154445  -8 2463  UA4HDB RA6LTD RR73
164845  -9  802  UA4HDB RD7LO -08 (x2)
171915  -9 1968  UB3ADO/P UA4HDB LO53 (x2)
172000  -7 2676  UA4HDB R5BM/M +15
172015  -8 1736  UB3ADO/P UA4HDB R-11
172130 -14 1737  UA4HDB R3PLA KO84 (x4)
183215  -4 1309  RW9FZ UA4HDB 73
183245  -7 1309  SP5KUNA UA4HDB LO53 (x2)

40m

UTC    dB Audio  Message
151200  -5 1486  UC6Y UA4HDB R+02 (x2)
151300  +5  714  R6ML UA4HDB -04 (x2)
151345  -6 1485  UA4HDB R6ML R-02
151400  +3  714  R6ML UA4HDB RR73
151445  -9 1565  UA4HDB OZ1GXW -16 (x2)
151530  -1  714  BG7BVP UA4HDB -11
151545  -9 1564  UA4HDB OZ1GXW -16 (x2)
151700 -13 1864  CQ UA4HDB LO53                        a1 (x2)
151745  -5 2732  UA4HDB G6ZRV JO02 (x2)

20m

UTC    dB Audio  Message
085145 -19 1833  UA4HDB RN6LBT RR73
085300 -18 1683  UI6O UA4HDB 73
085545  -5 1176  UA4HDB UA1AEL -01 (x2)
085730 -19 1965  UA1AEL UA4HDB R+04
085815  -7 1175  UA4HDB UA1AEL RR73
153945  -8  513  RI0FA UA4HDB LO53 (x2)
154145  -6  939  BH3MPM UA4HDB R-17
154215  -5  939  RI0FA UA4HDB R-05
143315 -15 2056  EX7DY UA4HDB LO53
143430  -3  336  UA4HDB EX7DY -07
143445 -11 2057  EX7DY UA4HDB R-08
143500  +1  335  UA4HDB EX7DY RR73
143515  -8 2057  EX7DY UA4HDB 73

10m

UTC    dB Audio  Message
105330  -8  507  UA4HDB RZ3ZY RR73
070745 -10  307  UA4HDB R6LKG LN07 (x3)
164215  -2  914  UA4HDB UA6BGM -19 (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.

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