RT5C — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO85

Receiver-side FT8 activity involving RT5C, decoded by SO8OO in southeastern Poland. 341 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 20 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 341 FT8 messages attributed to RT5C as the transmitting token by decoded message structure across 20 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (39%), followed by 20 m (30%) and 10 m (22%). Most decodes (52%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -7 dB.

Overview

341

Messages attributed

UTC dates decoded

Active 15-min windows

-7 dB

Estimated median S/N

Bands

160m · 9 80m · 22 40m · 133 20m · 102 10m · 75

First attributed message: 2026-06-06
Last attributed message: 2026-09-19 20:57 UTC

Observed FT8 message patterns

Attributed sample: 341 messages
Active dates: 20 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -17 to +6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 50, moderate (-15 to -9 dB) 101, strong (≥ -8 dB) 190.

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 RT5C in decoded directed-looking exchanges:

CR7BRV · Portugal ×2 RM5F · European Russia ×2 LZ4VR · Bulgaria OK2VCR · Czech Republic RX7T · European Russia SP5LST · Poland T77RN · San Marino TA2R · Asiatic Turkey HA7TM · Hungary RA3LBW · European Russia RA3SS · European Russia UA2FBW · Kaliningrad

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 RT5C

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: KO85 · 189 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,193 km (approx.)
Last such locator decoded: 2026-09-19 20:57 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	RT5C S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 12:18	10m	- / -8	CR7BRV	+12 / -	2	✓ Closing fragment
09-19 20:23	40m	- / -14	A99AA	-16 / -	2	✓ Closing fragment
09-19 20:21	40m	-13 / -	4Z5PT	-16 / -	2	✓ Closing observed
09-18 20:34	160m	- / -9	UA2FBW	-13 / -	2	✓ Closing fragment
09-18 20:32	160m	- / +2	RA3LBW	-4 / -	3	✓ Closing fragment
09-18 20:29	160m	-17 / -10	HA7TM	+13 / -12	4	✓ Full exchange observed
09-18 20:27	160m	-16 / -	R2EA/P	- / -11	2	Partial capture
09-18 20:25	160m	-10 / -11	RM5F	-18 / -	3	✓ Closing observed
09-18 20:22	160m	-10 / -1	RA3SS	+2 / -1	7	✓ Full exchange observed
09-16 20:35	40m	-17 / -	KG6JDX	- / -21	2	Partial capture
09-16 20:23	40m	-17 / -	KG6JDX	- / -	5	Partial capture
09-16 20:01	40m	- / -10	R8CKD	-10 / -	2	✓ Closing fragment
09-16 19:57	40m	- / -19	EI8GS	-1 / -	2	✓ Closing fragment
09-12 19:41	40m	-11 / -	R3UCC/P	- / -17	2	Partial capture
09-12 19:36	40m	-8 / -	JA4BWN	- / -26	5	✓ Closing fragment
09-12 19:35	40m	-9 / -	UN8PC	- / -	3	Partial capture
09-12 19:30	40m	-6 / -	CN8NS	- / -22	4	✓ Closing fragment
09-12 19:25	80m	- / -	DL2MED	-4 / -	2	Partial capture
09-12 19:25	80m	- / -5	UB3LBU	+3 / -	2	Partial capture
09-12 19:22	80m	- / +9	UA3SCU	-7 / -	4	Partial capture
09-12 19:20	80m	- / +1	R3TIT	-10 / -	2	✓ Closing fragment
09-12 19:20	80m	- / 0	R3PJ	-6 / -	4	✓ Closing fragment
09-09 21:14	80m	+12 / -	5Z4VJ	- / -	5	Partial capture
09-09 21:09	80m	-8 / -	5Z4VJ	- / -	4	Partial capture
09-08 21:44	40m	- / -6	UA9CR	-3 / -	3	✓ Closing fragment
09-08 21:37	40m	- / -12	UA9CR	-6 / -	2	Partial capture
09-08 21:27	40m	- / -15	8Z1IT	-10 / -	2	✓ Closing fragment
09-07 19:37	160m	- / -13	UD8S	-17 / -	5	Partial capture
08-28 12:02	20m	-7 / -	N2BJ	- / -	3	Partial capture
08-28 12:00	20m	-2 / -	RI1FJL	- / -2	3	✓ Closing fragment
08-28 11:55	20m	+11 / -	RI1FJL	- / -	3	Partial capture
08-16 14:20	20m	- / -1	MW7RHR	-13 / -	3	Partial capture
07-29 18:53	80m	-6 / 0	R70OBN	-2 / 0	4	✓ Full exchange observed
07-26 01:16	20m	- / -12	EC3A	-10 / -	2	Partial capture
07-26 01:06	40m	-13 / -	T46FCR	- / -	5	Partial capture
07-26 01:02	80m	0 / -8	R4FDD	+6 / -3	4	✓ Full exchange observed
07-26 01:01	80m	+3 / -1	DH1KJ	+6 / -11	5	✓ Full exchange observed
07-26 00:37	40m	-15 / -	OA4ENG	- / -	6	Partial capture
07-26 00:33	40m	-14 / -	VU2MSA	- / -7	2	✓ Closing fragment
07-26 00:32	40m	-18 / -	UA9UFG	- / -16	2	✓ Closing fragment
07-26 00:30	40m	-22 / -	SP7TF	- / +3	2	✓ Closing fragment
07-26 00:30	40m	-21 / -	IN3LHF	-24 / -16	5	✓ Full exchange observed
07-26 00:23	40m	-9 / -	N4ILE	- / -	3	Partial capture
07-26 00:20	40m	-4 / -	NP4EB	- / -	2	Partial capture
07-26 00:13	40m	-13 / -	HI8UD	- / -	3	Partial capture
07-26 00:09	40m	-10 / -	HK3X	- / -	2	Partial capture
07-26 00:04	40m	-6 / -	NP4EB	- / -	2	Partial capture
07-26 00:02	40m	-8 / -	PY4OY	- / -18	2	✓ Closing fragment
07-25 23:59	40m	-12 / -	PV8AJ	- / -	2	Partial capture
07-25 23:56	40m	-12 / -	HI8UD	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
092915  -8 1851  SP5LST RT5C -13 (x2)
093045 -23 1850  TA2R RT5C -20 (x3)
093200 -18 1081  RT5C EA7HY IM76
090400  -4  788  RT5C CR7BRV -05 (x2)
090715 -24 1770  4X6ST RT5C KO85 (x2)
130130 -13 2127  RX7T RT5C R-01 (x2)
130430 -16 1943  9J2FI RT5C KO85
121815 +11  763  RT5C CR7BRV -08 (x2)

40m

UTC    dB Audio  Message
200215  -8  924  RT5C R8CKD 73
202300 -13 2107  KG6JDX RT5C KO85 (x2)
202415  -5 2841  RT5C JF1UVJ PM95
202530 -16  835  KG6JDX RT5C KO85 (x3)
203300 -22 2041  BG7BVP RT5C -14
203500 -18 2041  KG6JDX RT5C R-21 (x2)
202130 -13 1288  4Z5PT RT5C KO85
202215 -16  987  RT5C 4Z5PT RR73
202315 -15 2543  RT5C A99AA -14 (x2)
205700 -16 1287  AP2FLY RT5C KO85

160m

UTC    dB Audio  Message
202545 -17 1104  RT5C RM5F 73
202700 -15 1908  R2EA/P RT5C KO85 (x2)
202900 -14 1690  CQ RT5C KO85
202915 +13 1690  RT5C HA7TM KN07
202930 -17 1690  HA7TM RT5C -12
202945 +13 1690  RT5C HA7TM R-10 (x2)
203115 -10  598  RT5C UA4CKN R-21
203245 -14 2215  RT5C RA3LBW KO54 (x3)
203415  -9 2325  RT5C UA2FBW R-09 (x2)
203530 -21 1690  CQ RT5C KO85

80m

UTC    dB Audio  Message
192015 -14 1610  RT5C R3PJ KO84
192045 -12 1304  RT5C R3TIT R+01 (x2)
192115  -4 1610  RT5C R3PJ KO84 (x3)
192245  -8 1077  RT5C UA3SCU +09 (x4)
192515  +4 1497  RT5C UB3LBU KO63
192515  -2  777  RT5C DL2MED JO40
192545  +2 1497  RT5C UB3LBU R-05
192545 -15  576  RT5C PF1B JO22
192545  -5  777  RT5C DL2MED JO40

20m

UTC    dB Audio  Message
011645 -11 1800  RT5C EC3A -12 (x2)
192400 -19 1075  RT5C BH4ECL PM01
142030  -9 1497  RT5C MW7RHR -01 (x3)
115515 +15 2474  RI1FJL RT5C KO85 (x6)
120245  -6 1707  N2BJ RT5C KO85 (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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