RD4FD — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO23

Receiver-side FT8 activity involving RD4FD, decoded by SO8OO in southeastern Poland. 40 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-15 and 2026-06-21.

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 40 FT8 messages attributed to RD4FD as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (93%), followed by 10 m (8%). Most decodes (93%) fell within the six-hour window 04:00-10:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

20m · 37 10m · 3

First attributed message: 2026-06-15
Last attributed message: 2026-06-21 04:36 UTC

Observed FT8 message patterns

Attributed sample: 40 messages
Active dates: 5 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -17 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 13, strong (≥ -8 dB) 20.

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 RD4FD in decoded directed-looking exchanges:

EX8ABR · Kyrgyzstan 9A5AZK · Croatia UA9QFF · Asiatic Russia YO6BHN · Romania 7Q5MP · Malawi R6DNC · European Russia M8KKH · England EA5D · Spain

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 RD4FD

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: LO23 · 30 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,639 km (approx.)
Last such locator decoded: 2026-06-21 04:36 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	RD4FD S/N	Counterpart	Counterpart S/N	Msgs	Capture
06-24 06:54	10m	- / -23	CT5IUO	-7 / -	8	Partial capture
06-24 06:26	20m	- / -7	M8KKH	-6 / -	2	✓ Closing fragment
06-21 04:35	20m	-11 / -	TI5RR	- / -	3	Partial capture
06-21 04:31	20m	-10 / -	TI5RR	- / -	3	Partial capture
06-21 04:22	20m	-8 / -	TY5AD	- / -	2	Partial capture
06-21 04:03	20m	-4 / -	TY5AD	- / -	2	Partial capture
06-20 04:51	20m	0 / -	HI3A	- / -	2	Partial capture
06-18 09:35	20m	-8 / -	UA9QFF	- / -9	3	✓ Closing fragment
06-18 09:33	20m	+8 / -	JA2ATE	- / -	2	Partial capture
06-18 09:03	10m	-16 / -5	R6DNC	-12 / -1	3	✓ Full exchange observed
06-18 08:56	10m	-18 / -16	D2UY	-14 / -12	4	Partial capture
06-18 07:24	10m	- / -14	EX8ABR	-19 / -	2	✓ Closing fragment
06-17 09:17	20m	- / 0	TF4CU	-6 / -	2	Partial capture
06-17 09:14	20m	-10 / -13	EA5D	-11 / -8	4	✓ Full exchange observed
06-17 09:12	20m	-4 / -	<...>	- / -	3	Partial capture
06-17 07:28	20m	-11 / -	9A5AZK	- / 0	3	✓ Closing fragment
06-15 05:13	20m	+6 / -	<...>	- / -	2	Partial capture
06-15 04:46	20m	-16 / -	N3RC	- / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
085730 -12 2088  RD4FD D2UY -16 (x2)
085845 -18 2105  D2UY RD4FD R-12
090300 -10  385  RD4FD R6DNC -05
090315 -16 1203  R6DNC RD4FD R-01
090330 -13  383  RD4FD R6DNC RR73
064815  -6 1659  RD4FD F6JON/QRP +04
065445  -6  567  RD4FD CT5IUO -23 (x8)

20m

UTC    dB Audio  Message
045130  +3  981  HI3A RD4FD LO23 (x2)
040215 -10 2332  HB9HSJ RD4FD LO23
040315  -5  401  TY5AD RD4FD LO23 (x4)
043100 -14  913  TI5RR RD4FD LO23 (x6)
062600  -7  945  RD4FD M8KKH -07 (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.

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