RJ4H — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO43

Receiver-side FT8 activity involving RJ4H, decoded by SO8OO in southeastern Poland. 7 FT8 messages attributed to this token as transmitter, on 40m, across 3 UTC dates in the available aggregate history. Observed between 2026-08-26 and 2026-09-04.

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 7 FT8 messages attributed to RJ4H as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -16 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-16 dB

Estimated median S/N

Bands

40m · 7

First attributed message: 2026-08-26
Last attributed message: 2026-09-04 17:09 UTC

Observed FT8 message patterns

Attributed sample: 7 messages
Active dates: 3 UTC dates
Estimated median S/N: -16 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 4, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 2.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with RJ4H in decoded directed-looking exchanges:

HG8LXL · Hungary R2EA/P · European Russia R2SN · European Russia R2YW · European Russia R3HW/P · European Russia R3YAU · European Russia R4YBG · European Russia R6AC · European Russia R6ML · European Russia RA3WY · European Russia RD7LC · European Russia RG5A · European Russia

Most frequent locator attributed to RJ4H

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: LO43 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,903 km (approx.)
Last such locator decoded: 2026-08-28 16:23 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	RJ4H S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 14:42	40m	- / -6	RG5A	-3 / -	3	✓ Closing fragment
09-20 13:37	40m	- / +5	R2YW	+2 / -	2	✓ Closing fragment
09-20 13:22	40m	- / -16	R2EA/P	-8 / -	2	✓ Closing fragment
09-20 13:17	40m	- / -	UB1CCL	-18 / -	2	✓ Closing fragment
09-18 13:48	40m	- / +8	UA3WDO	-8 / -	2	✓ Closing fragment
09-17 14:18	40m	- / -5	R6AC	-17 / -	2	✓ Closing fragment
09-02 16:31	40m	- / +3	R6ML	-2 / -	2	✓ Closing fragment
09-02 16:23	40m	- / -	SP9EVL	-3 / -	2	Partial capture
09-02 16:20	40m	- / -5	UA4FEN	-6 / -	2	✓ Closing fragment
09-02 16:13	40m	- / -5	UB3YCK	+2 / -	2	✓ Closing fragment
08-28 16:23	40m	- / -	R2ASY	+1 / -	2	Partial capture
08-28 16:23	40m	-18 / -	R4YBG	- / -4	3	✓ Closing fragment
08-26 18:09	40m	-7 / -	UA9LLE	- / -10	3	✓ Closing fragment
08-11 04:53	40m	- / -4	R6OGV	-16 / -	2	Partial capture
08-10 17:30	40m	- / -	RN6HK	-13 / -	2	Partial capture
07-16 13:05	20m	- / -	DL1FAM	-10 / -	2	Partial capture
07-15 16:40	40m	- / -4	R2SN	-20 / -	2	✓ Closing fragment
07-15 16:39	40m	- / -6	R3YAU	-14 / -	2	✓ Closing fragment
07-15 16:37	40m	- / -4	RD7LC	-5 / -	2	✓ Closing fragment
07-15 16:35	40m	- / -13	HG8LXL	-11 / -	4	✓ Closing fragment
07-15 16:33	40m	- / -8	RK6MC	-16 / -	4	Partial capture
07-13 06:09	20m	- / -	RQ2Q	+10 / -	2	Partial capture
07-10 20:01	40m	- / -18	RA3WY	-14 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
141345 -15 1702  RJ4H UA3QNA +02
141800 -16 1807  RJ4H R6AC R-05 (x2)
134815  -9 2151  RJ4H UA3WDO +08 (x2)
125915 -20 1196  RJ4H RN3TT -04
131745 -21 1805  RJ4H UB1CCL KO48 (x2)
132200  -9 1134  RJ4H R2EA/P -16 (x2)
133715  +6  769  RJ4H R2YW +05 (x2)
144215  -1  837  RJ4H RG5A KN93 (x3)

20m

UTC    dB Audio  Message
060900 +12  371  RJ4H RQ2Q KO91 (x2)
130545  -7 1946  RJ4H DL1FAM JN49 (x2)
055645 -23 1720  RJ4H RU6UR -04
073415  -8 2596  RJ4H EW8CW KO52

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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