RZ5D — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KN75

Receiver-side FT8 activity involving RZ5D, decoded by SO8OO in southeastern Poland. 1,856 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 82 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-19.

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 1,856 FT8 messages attributed to RZ5D as the transmitting token by decoded message structure across 82 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (59%), followed by 10 m (18%) and 80 m (15%). Most decodes (70%) 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 -9.3 dB.

Overview

1,856

Messages attributed

UTC dates decoded

344

Active 15-min windows

-9.3 dB

Estimated median S/N

Bands

160m · 98 80m · 281 40m · 1,091 20m · 45 10m · 341

First attributed message: 2026-06-06
Last attributed message: 2026-09-19 19:32 UTC

Observed FT8 message patterns

Attributed sample: 1,856 messages
Active dates: 82 UTC dates
Estimated median S/N: -9.3 dB
Estimated 10th-90th percentile: -17.8 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 291, moderate (-15 to -9 dB) 741, strong (≥ -8 dB) 824.

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 RZ5D in decoded directed-looking exchanges:

R2SN · European Russia ×6 R3ZMM · European Russia ×2 R6FFB · European Russia ×2 UA3GIU · European Russia ×2 R9CS/P · Asiatic Russia ×2 RA3QBT · European Russia ×2 RM5F · European Russia ×2 R2ZCA · European Russia ×2 UB4HVA · European Russia ×2 EP2AES · Iran ×2 RA4HEV · European Russia ×2 RC6OD · 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 RZ5D

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: KN75 · 838 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,102 km (approx.)
Last such locator decoded: 2026-09-19 19:32 UTC

Other locator fields attributed to this token: JN65 (5).

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	RZ5D S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 19:31	80m	-21 / -	RA3VMD	- / -	2	Partial capture
09-19 19:02	40m	-15 / -	RA3S	- / -	3	Partial capture
09-19 18:58	40m	-14 / -	R4HLO	- / -	2	Partial capture
09-19 18:57	40m	-12 / -	OH/DL4XT	- / -	2	Partial capture
09-19 18:54	40m	-16 / -	OH/DL4XT	- / -	2	Partial capture
09-19 18:49	40m	-9 / -	R4HLO	- / -	3	Partial capture
09-18 18:54	40m	-7 / -	R4PHH	- / -	5	Partial capture
09-18 18:51	40m	-10 / -	RW4CCW	- / -	2	Partial capture
09-18 03:34	40m	-10 / -	UA4PCM	- / -	2	Partial capture
09-18 03:28	40m	-4 / -	II6IALU	- / -6	2	Partial capture
09-18 03:25	40m	-7 / -	RA3XDX	- / -	4	Partial capture
09-18 03:20	40m	-8 / -	KH6M	- / -	4	Partial capture
09-18 03:17	40m	-8 / -	R8CW	- / -	4	Partial capture
09-18 03:13	40m	-10 / -	AD4C	- / -	3	Partial capture
09-18 03:05	80m	-12 / -	UA4UAR	- / -	4	Partial capture
09-18 02:58	80m	-16 / -	R4HNW	- / -	3	Partial capture
09-18 02:54	80m	-15 / -	UA4UAR	- / -	5	Partial capture
09-18 02:47	160m	- / -17	RA3QBT	+6 / -	2	✓ Closing fragment
09-18 02:41	40m	- / -15	RC8SAB	-14 / -	2	Partial capture
09-18 02:31	40m	- / -7	RN4LP	+5 / -	2	✓ Closing fragment
09-18 02:29	40m	- / -	EP2AES	-18 / -	2	✓ Closing fragment
09-18 02:11	40m	- / +2	RN4LP	+11 / -	2	Partial capture
09-18 01:55	40m	- / -16	RW9WT	-14 / -	2	✓ Closing fragment
09-18 01:46	80m	-17 / -	R8FH	- / -	5	Partial capture
09-18 01:43	80m	-18 / -15	UA3PAB	+1 / +3	5	✓ Full exchange observed
09-17 16:41	40m	-9 / -	UB8JFD	- / -	3	Partial capture
09-17 16:40	40m	-4 / -	R4HLO	- / -	2	Partial capture
09-17 16:39	40m	-6 / -	RY3QAB	- / -	2	Partial capture
09-17 16:37	40m	-13 / -	II8IHBC	- / +7	3	Partial capture
09-17 16:34	40m	-10 / -	UB3PET	- / -	5	Partial capture
09-17 16:32	40m	-12 / -	R8FH	- / -	4	Partial capture
09-17 16:30	40m	-14 / -	RT8T	- / -	4	Partial capture
09-17 16:29	40m	-16 / -	RL3QGR	- / -9	2	✓ Closing fragment
09-17 05:34	40m	- / -3	RA3QBT	-6 / -	2	✓ Closing fragment
09-16 15:31	40m	-10 / -	RD6OW	- / -	2	Partial capture
09-15 19:02	40m	- / -20	UA7XA	+5 / -	3	✓ Closing fragment
09-14 18:03	40m	- / -11	R2PU	+3 / -	2	✓ Closing fragment
09-14 05:29	40m	- / -12	RX3DQX	-4 / -	2	✓ Closing fragment
09-14 03:41	40m	-7 / -	RN3AOE	-2 / -	4	✓ Closing observed
09-13 19:40	80m	- / -12	R2ZAA	-6 / -	3	✓ Closing fragment
09-13 19:24	80m	-14 / -18	RD9M/3	0 / -7	3	Partial capture
09-13 19:07	160m	-14 / -	R9CS/P	-13 / -	2	✓ Closing observed
09-13 16:58	40m	-8 / -16	US1EA	-6 / -13	5	✓ Full exchange observed
09-13 16:55	40m	-6 / -	R1TAX	- / -	4	Partial capture
09-13 16:48	40m	-10 / -	UB4Y	- / -	5	Partial capture
09-13 16:39	40m	-8 / -12	UB1ATR	-13 / -14	3	✓ Full exchange observed
09-13 16:23	40m	- / -	R6YG	0 / -	4	Partial capture
09-12 19:36	80m	-12 / -11	UB3ADO/P	-6 / -16	4	✓ Full exchange observed
09-12 15:40	40m	-11 / -	RK9DO	- / -13	2	Partial capture
09-12 15:32	40m	- / -4	R2SN	+1 / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
025445 -19  880  UA4UAR RZ5D KN75 (x5)
025815 -15  879  R4HNW RZ5D KN75 (x3)
030515 -14  862  UA4UAR RZ5D KN75 (x4)
192430 -19  450  R1IO RZ5D KN75
193145 -22  421  RA3VMD RZ5D KN75 (x2)

40m

UTC    dB Audio  Message
185545  -6  478  R4PHH RZ5D KN75 (x2)
051445 -10  414  UA6LTA RZ5D 73
184915  -7  449  R4HLO RZ5D KN75 (x3)
185445 -14  448  OH/DL4XT RZ5D KN75 (x4)
185845 -13  449  R4HLO RZ5D KN75 (x2)
190215 -21  450  RA3S RZ5D KN75 (x3)

160m

UTC    dB Audio  Message
185415 -11 2339  UA3TCJ RZ5D KN75 (x7)
193815 -14  817  RZ5D UF6V/UA5D -17 (x2)
190700 -13 2478  RZ5D R9CS/P RR73
190715 -14 2476  R9CS/P RZ5D 73
191115 -21 1568  RZ5D RA4LAG RR73
191600 -16  994  RW2Z RZ5D KN75
024700  +4  796  RZ5D RA3QBT -17 (x2)

20m

UTC    dB Audio  Message
100145  -4 1443  RZ5D R3KCW RR73
081100  -2 2628  RZ5D RR73; R5FN <R6DOB/M> -12 (x2)
133730  -7 2180  RZ5D UA3WDO -06 (x2)
165945 -19  761  R3VA RZ5D KN75
074930 -18 1084  OH/HB9BWE RZ5D KN75
075730  -1 1877  RZ5D R1530IG -06
075745  -9 1047  IR7MGGC RZ5D R-08
075800  +4 1877  RZ5D RR73; DL1CC <...> +12
125015  -8 1714  RZ5D UB4HVA -19 (x2)
131830  -1 2426  RZ5D R4SCB -11 (x2)
144100 -15 1900  RZ5D RA3TT RR73

10m

UTC    dB Audio  Message
091745 -14  887  R3BEO RZ5D KN75
092215 -13  888  RC2Y RZ5D KN75 (x3)
133115 -13  685  RZ5D RA4ABH +06
144645 -18 1913  RZ5D RZ3DZ RR73
144700 -12  726  RZ3DZ RZ5D R+02
144830 -13  855  R7TO RZ5D KN75
145215  -6 2501  RZ5D RA3FH -01 (x2)
150045  -9 2047  RZ5D RN6MA RR73
080330 -11  513  R6FMF RZ5D KN75
120645  -4  531  RZ5D LZ2SPD KN22 (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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