RT4A/QRP — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia

Receiver-side FT8 activity involving RT4A/QRP, decoded by SO8OO in southeastern Poland. 1,638 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 12 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-09.

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 1,638 FT8 messages attributed to RT4A/QRP as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (97%), followed by 20 m (3%) and 40 m (1%). Most decodes (89%) fell within the six-hour window 20:00-02:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11.4 dB.

Overview

1,638

Messages attributed

UTC dates decoded

106

Active 15-min windows

-11.4 dB

Estimated median S/N

Bands

80m · 1,586 40m · 11 20m · 41

First attributed message: 2026-06-07
Last attributed message: 2026-09-09 19:19 UTC

Observed FT8 message patterns

Attributed sample: 1,638 messages
Active dates: 12 UTC dates
Estimated median S/N: -11.4 dB
Estimated 10th-90th percentile: -19 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 342, moderate (-15 to -9 dB) 799, strong (≥ -8 dB) 497.

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 RT4A/QRP in decoded directed-looking exchanges:

LY790A · Lithuania ×3 8C81NB · Indonesia ×2 8E81KG · Indonesia ×2 Z335MK · North Macedonia ×2 8B81KB · Indonesia RA0AF · Asiatic Russia RA0SCA · Asiatic Russia R9CP · Asiatic Russia DL1EDR · Fed. Rep. of Germany LZ67PP · Bulgaria IZ3ATV · Italy RC2Y · European 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.

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	RT4A/QRP S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-09 18:48	80m	- / -13	DA6WM	-8 / -	2	Partial capture
09-09 18:15	80m	- / +5	SP9HAX	+6 / -	2	Partial capture
09-09 18:10	80m	- / -	SP9FVO	+6 / -	2	Partial capture
09-09 17:35	80m	- / -	SP3CCR	0 / -	2	Partial capture
09-09 16:44	80m	- / -	RA3TVW	+2 / -	2	Partial capture
09-09 05:54	80m	- / -19	F4GUK	-14 / -	3	Partial capture
09-09 05:43	80m	- / -	DL1LRI	-2 / -	4	Partial capture
09-09 04:31	80m	- / -12	SQ3LMR	-7 / -	4	Partial capture
09-09 02:10	80m	-12 / -	<...>	+12 / -	2	✓ Closing fragment
09-09 02:09	80m	-14 / -12	SP6FME	+8 / +1	3	Partial capture
09-09 01:55	80m	- / -8	OK2UPG	+14 / -	2	Partial capture
09-09 00:39	80m	- / -	EA1AIQ	+1 / -	3	Partial capture
09-09 00:29	80m	- / -4	R4HHN	-7 / -	2	Partial capture
09-08 23:39	80m	- / -5	G8OO	-3 / -	7	Partial capture
09-08 23:25	80m	-16 / -	<...>	- / -	2	✓ Closing fragment
09-08 23:15	80m	-12 / -	F5RRS	- / -2	2	Partial capture
09-08 22:55	80m	+5 / -	9V1YC	- / -14	2	Partial capture
09-08 22:35	80m	- / -	OM1AGE	-4 / -	4	Partial capture
09-08 22:31	80m	-9 / -17	DL1FLW	-1 / -13	5	Partial capture
09-08 22:28	80m	-5 / -	<...>	0 / -	6	✓ Closing fragment
09-08 22:24	80m	-12 / -	IK0MHR	- / -14	2	Partial capture
09-08 22:22	80m	-7 / -	RA0AF	- / 0	3	✓ Closing fragment
09-08 22:21	80m	-13 / -	<...>	-8 / -	2	✓ Closing fragment
09-08 22:20	80m	- / -17	UR5TU	-19 / -	5	Partial capture
09-08 22:18	80m	-11 / -	<...>	-4 / -	2	✓ Closing fragment
09-08 22:01	80m	- / +10	SP9MRP	+10 / -	2	Partial capture
09-08 21:59	80m	-7 / -	<...>	-3 / -	3	✓ Closing fragment
09-08 21:58	80m	-8 / -16	DG5PW	-7 / -18	6	Partial capture
09-08 21:55	80m	- / -	DF1OE	-24 / -	2	Partial capture
09-08 21:45	80m	-14 / -	<...>	+6 / -	2	✓ Closing fragment
09-08 21:39	80m	- / -11	RA9ACA	-7 / -	2	Partial capture
09-08 21:21	80m	-15 / -	<...>	- / -	2	✓ Closing fragment
09-08 20:59	80m	-16 / -	<...>	-14 / -	5	✓ Closing fragment
09-08 20:42	80m	- / -	PI4DX	-2 / -	5	Partial capture
09-08 20:37	80m	- / -18	I0MQV	-10 / -	2	Partial capture
09-08 20:35	80m	-20 / -	RC9WC	- / +6	2	Partial capture
09-08 20:33	80m	-21 / -5	R3PJV	-4 / +5	4	✓ Full exchange observed
09-08 20:31	80m	-10 / -	<...>	+12 / -	3	✓ Closing fragment
09-08 20:09	80m	-20 / -	<...>	-7 / -	2	✓ Closing fragment
09-08 20:02	80m	- / -14	R3PLA	-11 / -	2	Partial capture
09-08 19:54	80m	- / -10	R3YAU	+4 / -	2	Partial capture
09-08 19:43	80m	- / -15	UX0FF	+12 / -	2	Partial capture
09-08 18:57	80m	- / -15	RA2FU	-7 / -	3	Partial capture
09-08 18:51	80m	- / -20	RK9UM	-12 / -	3	Partial capture
09-08 18:47	80m	-12 / -	<...>	+5 / -	2	✓ Closing fragment
09-08 18:42	80m	-11 / -	<...>	-2 / -	3	✓ Closing fragment
09-08 18:37	80m	-6 / -	<...>	0 / -	2	✓ Closing fragment
09-08 18:27	80m	- / -	<...>	+3 / -	3	✓ Closing fragment
09-08 07:16	80m	-16 / -	SP9AWP	- / -16	2	Partial capture
09-08 04:09	40m	- / 0	IU4DTV	-4 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
055545 -14 2530  RT4A/QRP F4GUK R-19
164445  -1 2790  RT4A/QRP RA3TVW LO25 (x2)
173330 +11 1708  RT4A/QRP OM1AN R+06
173515  -2 1300  RT4A/QRP SP3CCR JO72 (x2)
181045  +3 2013  RT4A/QRP SP9FVO JN99 (x2)
181515  +8 2252  RT4A/QRP SP9HAX JO90 (x2)
184800  -9 2477  RT4A/QRP DA6WM JO61 (x2)
191930  +2  736  DA6PI RT4A/QRP -08
202315 -22 2009  RT4A/QRP UA9CQV MO06
220745  -4 1542  RT4A/QRP IN3XUG R-03

40m

UTC    dB Audio  Message
210645  +5  640  RT4A/QRP F1IQH JN27
210730 -10  640  F1IQH RT4A/QRP -15 (x2)
210930  -6  640  <...> RT4A/QRP RR73 (x2)
211030  -6  640  CQ RT4A/QRP (x4)
211415 -15 1359  RT4A/QRP <...> 73 (x2)
040445  +1 1356  RT4A/QRP IU4DTV +01 (x4)

20m

UTC    dB Audio  Message
174315  -4 1543  8E81KG RT4A/QRP 73
174545 -18 1853  RT4A/QRP EA7AZH -12
174645 -14 1857  RT4A/QRP HA7XL JN97 (x2)
175315  -6 1857  RT4A/QRP YO6PNM KN25 (x6)
180845 -17 1861  RT4A/QRP UA6YEX -14
180845 -16 1544  RT4A/QRP F1ODM -15
181045 -13 1543  RT4A/QRP PD7JLP JO32
181415 -11 1863  RT4A/QRP PD4WAC JO22 (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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