RA3ZH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO81

Receiver-side FT8 activity involving RA3ZH, decoded by SO8OO in southeastern Poland. 4,856 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 97 UTC dates in the available aggregate history. Observed between 2026-06-06 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 4,856 FT8 messages attributed to RA3ZH as the transmitting token by decoded message structure across 97 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (50%), followed by 40 m (26%) and 10 m (9%). Most decodes (70%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (75%); the estimated median was -3.9 dB.

Overview

4,856

Messages attributed

UTC dates decoded

779

Active 15-min windows

-3.9 dB

Estimated median S/N

Bands

160m · 368 80m · 339 40m · 1,257 20m · 2,443 10m · 449

First attributed message: 2026-06-06
Last attributed message: 2026-09-20 20:55 UTC

Observed FT8 message patterns

Attributed sample: 4,856 messages
Active dates: 97 UTC dates
Estimated median S/N: -3.9 dB
Estimated 10th-90th percentile: -13 to +7.6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 288, moderate (-15 to -9 dB) 913, strong (≥ -8 dB) 3,655.

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 RA3ZH in decoded directed-looking exchanges:

TA7ARH · Asiatic Turkey ×2 OK1DXR · Czech Republic ×2 R3RRC/P · European Russia ×2 RI1FJZ · Franz Josef Land ×2 RM3ZR · European Russia ×2 UA3ZQN · European Russia ×2 DU1RAA · Philippines ×2 JA2VFH · Japan ×2 JK1PCP · Japan ×2 R1ZDG · European Russia ×2 R50RKZ · European Russia ×2 UN6GO · Kazakhstan ×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 RA3ZH

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: KO81 · 3,683 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,083 km (approx.)
Last such locator decoded: 2026-09-20 20:54 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	RA3ZH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 22:59	40m	- / 0	KR4HGQ	-8 / -	3	✓ Closing fragment
09-20 22:57	40m	- / -14	NG2O	-8 / -	2	✓ Closing fragment
09-20 22:54	40m	- / -9	VO1HP	-2 / -	2	✓ Closing fragment
09-20 22:48	40m	- / -14	VE9GSB	-21 / -	3	Partial capture
09-20 22:28	40m	- / -	RZ4FWA	-10 / -	2	Partial capture
09-20 20:55	40m	- / -	TA2EE	-19 / -	2	Partial capture
09-20 20:54	40m	+6 / -	JR4KVI	- / -19	3	✓ Closing fragment
09-20 20:54	40m	- / +8	UA3RBM	-13 / -	4	Partial capture
09-20 20:52	40m	+6 / -	JM6FLU	- / -16	4	✓ Closing fragment
09-20 20:51	40m	0 / -	JH1GZV	- / -17	2	✓ Closing fragment
09-20 19:32	80m	- / -	IK6GPZ	-3 / -	9	Partial capture
09-20 19:31	80m	+1 / -	EA6Y	+4 / -13	7	✓ Closing observed
09-20 19:29	80m	0 / -	JE2ERR	- / -	2	Partial capture
09-20 19:17	160m	+2 / -	RW9WT	- / -	4	Partial capture
09-20 19:09	160m	0 / -15	LX1JH	+12 / -14	9	✓ Full exchange observed
09-20 19:05	160m	+5 / -	RW3VA	- / -16	3	✓ Closing fragment
09-20 18:59	160m	-3 / -	JF1SQC	- / -	4	Partial capture
09-20 18:58	160m	+5 / -	SP73VOT	- / -24	2	Partial capture
09-20 18:56	160m	+5 / -	JM1JZN	- / -	3	Partial capture
09-20 18:53	160m	+2 / -	JF8QNF	- / -	2	Partial capture
09-20 18:51	160m	+8 / -	JE2ERR	- / -	4	Partial capture
09-20 18:50	160m	+3 / -	R2FCT	-2 / -26	4	✓ Closing observed
09-20 18:47	160m	- / -2	RM3ZR	+5 / -	2	✓ Closing fragment
09-20 18:46	160m	- / -	RW3DW	-21 / -	2	Partial capture
09-20 18:45	160m	-13 / -	UA4SN	- / -1	2	Partial capture
09-20 18:40	160m	-2 / -17	R2FCT	-6 / -	4	Partial capture
09-20 18:37	160m	-8 / -	UA6XY	- / -	4	Partial capture
09-20 18:36	160m	- / -	SV2AEL	-2 / -	6	Partial capture
09-20 18:34	160m	+2 / -	R2FCT	-6 / -19	3	Partial capture
09-20 18:30	160m	+2 / -	UA4LDP	- / +2	11	✓ Closing fragment
09-20 18:26	160m	+2 / -	4L7T	- / -	3	Partial capture
09-20 18:25	160m	- / +5	DL1RNW	+13 / -	3	Partial capture
09-20 18:16	160m	+1 / -	RW9QA	- / -	7	Partial capture
09-20 18:12	160m	-5 / -	UC1I	- / -	4	Partial capture
09-20 18:10	160m	-12 / -	RJ9M	- / -	2	✓ Closing fragment
09-20 18:08	160m	-9 / -7	RC6OG	-14 / -7	5	✓ Full exchange observed
09-20 18:06	160m	-2 / -11	TA6B	-20 / -	4	Partial capture
09-20 18:05	160m	-1 / -	RX4HX	-19 / -3	3	✓ Closing observed
09-20 17:59	160m	+3 / -4	UA1TAN	-8 / -9	6	✓ Full exchange observed
09-20 17:57	160m	+7 / -	JG3TRB	- / -	3	Partial capture
09-20 17:55	160m	- / -8	UA1TAN	-16 / -	3	Partial capture
09-20 17:54	160m	- / -	R7DX	-6 / -	6	Partial capture
09-20 17:53	160m	+7 / -23	IT9GUL	-4 / -14	5	✓ Full exchange observed
09-20 17:52	160m	+3 / -17	OK1DXR	+1 / -17	21	✓ Full exchange observed
09-20 17:51	160m	-7 / -	RL7Z	- / -	2	✓ Closing fragment
09-20 17:50	160m	- / -	RA3BY	-6 / -	6	Partial capture
09-20 16:07	160m	-5 / -	R9YCV	- / -	5	Partial capture
09-20 16:06	160m	0 / -	BD4UJ	- / -	2	Partial capture
09-20 16:04	160m	-6 / -	R0ADK	- / -	4	Partial capture
09-19 23:44	40m	- / -	IK0CHU	+7 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
205545  +5 1695  JR4KVI RA3ZH 73
205615  -6 1125  RA3ZH UA3RBM +08
222800  -9 2027  RA3ZH RZ4FWA LO23 (x2)
224545  -2  402  RA3ZH F6FHZ JN18
224845 -22 1467  RA3ZH VE9GSB -14 (x3)
225430  -3 2781  RA3ZH VO1HP -09 (x2)
225745  -8  454  RA3ZH NG2O -14 (x2)
225915  -6  405  RA3ZH KR4HGQ +00 (x3)

80m

UTC    dB Audio  Message
193200  -1 2505  EA6Y RA3ZH KO81 (x2)
193245  +5 1436  RA3ZH IK6GPZ JN62
193300  -1 2505  EA6Y RA3ZH R-13
193315  +3 1438  RA3ZH IK6GPZ JN62
193315  +6 2342  RA3ZH EA6Y RR73
193330  -7 2505  EA6Y RA3ZH 73
193345  -5 1438  RA3ZH IK6GPZ JN62
193345  +3 2342  RA3ZH EA6Y 73
193415  -9 1438  RA3ZH IK6GPZ JN62 (x6)

160m

UTC    dB Audio  Message
190545  +6  393  RW3VA RA3ZH R-16 (x2)
190930  +4  393  LX1JH RA3ZH KO81 (x5)
191300 +10  653  RA3ZH LX1JH -15
191315  -4 2834  LX1JH RA3ZH R-14
191330 +14 2834  RA3ZH LX1JH RR73
191345  +4 2834  LX1JH RA3ZH 73
191700  +1  448  RW9WT RA3ZH KO81 (x4)

10m

UTC    dB Audio  Message
090715  +6  378  <...> RA3ZH KO81 (x10)
112900 -14 1498  RA3ZH DN9AD JO52 (x4)
110730 -13 2539  RA3ZH V51WH +16

20m

UTC    dB Audio  Message
123545  -3 2938  <...> RA3ZH KO81
123615  -3 2938  <OH0/ES2TT> RA3ZH KO81 (x2)
173200 -11  278  BG5GEB RA3ZH KO81 (x4)
174945 -18 2308  RA3ZH BG5GEB -11 (x2)
175245 -17  855  TA3ZH RA3ZH KO81
184315  -8  630  <...> RA3ZH KO81 (x2)
201730 -11  755  K1WY RA3ZH KO81
201815  -8 1505  RA3ZH K1WY -25 (x2)

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.

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