OT4R — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JO21

Receiver-side FT8 activity involving OT4R, decoded by SO8OO in southeastern Poland. 1,500 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, 10m, across 70 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-16.

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 1,500 FT8 messages attributed to OT4R as the transmitting token by decoded message structure across 70 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (49%), followed by 40 m (39%) and 20 m (8%). Several six-hour UTC windows tied for the largest share (67%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

1,500

Messages attributed

UTC dates decoded

248

Active 15-min windows

-12 dB

Estimated median S/N

Bands

60m · 728 40m · 588 20m · 119 10m · 65

First attributed message: 2026-06-07
Last attributed message: 2026-09-16 07:11 UTC

Observed FT8 message patterns

Attributed sample: 1,500 messages
Active dates: 70 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -20 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 475, moderate (-15 to -9 dB) 611, strong (≥ -8 dB) 414.

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 OT4R in decoded directed-looking exchanges:

SP3MZ · Poland ×2 DM5JBN · Fed. Rep. of Germany ×2 HB9CNU · Switzerland ×2 OK7BB · Czech Republic ×2 DL4JTH · Fed. Rep. of Germany ×2 OH3CD · Finland ×2 OK2PB · Czech Republic ×2 SP8MZB · Poland ×2 SQ3TR · Poland ×2 DL9KM · Fed. Rep. of Germany ×2 EA2EES · Spain ×2 ER1CW · Moldova ×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 OT4R

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: JO21 · 76 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,192 km (approx.)
Last such locator decoded: 2026-09-16 07:11 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	OT4R S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-16 07:06	40m	-19 / -	OE9NET	- / -9	2	Partial capture
09-16 07:03	40m	-22 / -	DA1NCO	- / +4	2	Partial capture
09-16 07:02	40m	-18 / -	II6IGTO	- / -4	2	Partial capture
09-16 07:01	40m	-20 / -	TK/4O7CC	- / -4	2	Partial capture
09-16 07:00	40m	-14 / -16	IW3AOT	-14 / -	3	✓ Closing observed
09-16 06:52	40m	- / -	DL4LBM	-14 / -	3	✓ Closing fragment
09-16 06:49	40m	-18 / -	TK/4O7CC	- / -12	2	Partial capture
09-16 06:47	40m	-21 / -	OK7BB	+10 / +6	3	✓ Closing observed
09-16 06:45	40m	-20 / -1	OK1DCM	-7 / +3	3	✓ Full exchange observed
09-16 06:43	40m	-19 / -	TK/4O7CC	- / -9	3	Partial capture
09-15 21:05	60m	-20 / -	I/DH9YAX	- / -6	2	Partial capture
09-15 21:04	60m	-17 / -4	GX3RAF/P	-17 / -4	2	Partial capture
09-15 21:03	60m	-17 / -	G0IOW	- / -5	2	✓ Closing fragment
09-15 21:01	60m	-14 / -10	ER1CW	-22 / -14	5	✓ Full exchange observed
09-15 20:59	60m	-17 / -16	IW7EGY	-1 / -4	4	✓ Full exchange observed
09-15 20:57	60m	-16 / -19	GX3RAF/P	-10 / +3	4	✓ Full exchange observed
09-15 20:55	60m	-16 / +8	SM4HCM	-6 / +8	4	✓ Full exchange observed
09-15 20:54	60m	-14 / -6	IU6PPX	-2 / +2	4	✓ Full exchange observed
09-15 20:51	60m	-14 / -3	DL1RBV	0 / +5	5	✓ Full exchange observed
09-15 12:08	40m	- / -3	DH4MK	-16 / -	2	✓ Closing fragment
09-14 21:21	40m	-2 / -7	IW0HAC	-2 / +2	5	✓ Full exchange observed
09-14 21:20	40m	-5 / -	IU8VUX	- / -8	2	Partial capture
09-14 21:17	60m	-12 / -	SP4OIK	-16 / -16	6	✓ Closing observed
09-14 21:14	40m	-6 / -	9A5AGY	- / -	2	Partial capture
09-14 21:07	60m	- / -4	DJ6MN	-14 / -	2	✓ Closing fragment
09-14 21:05	60m	- / -5	DG3TF	-2 / -	2	✓ Closing fragment
09-14 13:24	40m	-21 / 0	OK1XLE	+7 / -5	4	✓ Full exchange observed
09-14 13:22	40m	-20 / -	PE1RGO	- / -12	2	Partial capture
09-14 13:19	40m	-20 / -	ON4KVI	-11 / -2	2	Partial capture
09-14 13:19	40m	- / -13	OE6OCG	-4 / -	4	✓ Closing fragment
09-14 13:16	40m	-24 / -4	PD1DP	-23 / +2	3	Partial capture
09-13 21:13	60m	-8 / -	SP5MIG	- / +6	2	Partial capture
09-13 21:12	40m	- / -9	IZ8PPI	-22 / -	2	Partial capture
09-13 21:08	60m	-13 / -	SP5MIG	- / +8	3	Partial capture
09-13 14:19	40m	- / -8	DD1OO	-10 / -	2	✓ Closing fragment
09-13 14:05	40m	-19 / -7	SP2HYO	+5 / -7	5	✓ Full exchange observed
09-13 14:00	40m	-19 / +3	DL3DKO	-10 / 0	5	✓ Full exchange observed
09-13 13:59	40m	-18 / -10	SP7BRK	0 / -13	5	✓ Full exchange observed
09-13 13:49	40m	-22 / -	DL8NCV	- / -10	2	✓ Closing fragment
09-13 13:44	40m	-17 / -	DH2UHE	-2 / -5	4	✓ Full exchange observed
09-13 13:40	40m	-22 / +7	DL3KDP	-10 / -10	4	✓ Full exchange observed
09-13 08:49	40m	- / +8	DL1AXX	+4 / -	2	✓ Closing fragment
09-13 08:19	40m	- / -11	OK2PB	+4 / -	4	✓ Closing fragment
09-12 21:19	60m	-11 / -8	LB6NK	-4 / -6	3	Partial capture
09-12 21:18	60m	-8 / -5	DL9ZA	0 / +4	4	✓ Full exchange observed
09-12 21:16	60m	-10 / -13	SQ3TR	-6 / +1	5	✓ Full exchange observed
09-12 21:09	60m	-10 / -	F4BYA	- / -5	2	Partial capture
09-12 21:08	60m	-2 / +4	DL6ZXG	+4 / +6	3	✓ Full exchange observed
09-12 21:06	40m	0 / -	UR4WXN	- / -4	2	Partial capture
09-12 21:04	60m	-10 / +8	DL4YDR	-5 / +6	4	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
065315 -14 1471  OT4R DL4LBM 73
065745 -21 1471  IW3AOT OT4R +05
070000 -17 1542  OT4R IW3AOT R-16
070015 -14 1470  IW3AOT OT4R RR73
070030 -10 1542  OT4R IW3AOT 73
070115 -22 1471  TK/4O7CC OT4R -04 (x2)
070215 -18 1471  <II6IGTO> OT4R -04 (x2)
070315 -24 1471  DA1NCO OT4R +04 (x2)
070645 -19 1471  OE9NET OT4R -09 (x2)
071045  -9 1471  CQ OT4R JO21 (x2)

60m

UTC    dB Audio  Message
205930 -17 1389  IW7EGY OT4R -04
210015  -2 1065  OT4R IW7EGY R-16
210030 -17 1388  IW7EGY OT4R RR73
210045  +0 1065  OT4R IW7EGY 73
210115 -21 1670  OT4R ER1CW KN47
210130 -11 1389  ER1CW OT4R -14
210145 -24 1670  OT4R ER1CW R-10
210200 -17 1389  ER1CW OT4R RR73
210215 -22 1670  OT4R ER1CW 73
210300 -16 1389  G0IOW OT4R -05 (x2)
210400 -17 1389  GX3RAF/P OT4R -04
210415 -17 1389  OT4R GX3RAF/P R-04
210530 -21 1389  I/DH9YAX OT4R -06 (x2)

20m

UTC    dB Audio  Message
134600  +3 1418  UR5WCS OT4R -08
134900  +5 1418  SQ8MA OT4R +00
134930  +3 1418  SP3Q OT4R JO21
135000  +7 1418  SQ8MA OT4R RR73 (x2)
135330  +1 1418  UR5WCS OT4R -05
113715 -13 1479  CT1END/P OT4R R-07
083945  +0 1514  Z62NS OT4R +10 (x4)
084245  +3 1514  SQ5ROB OT4R +11 (x2)
090030  +1 1514  CT2JTN OT4R +11 (x2)

10m

UTC    dB Audio  Message
105215 -15 1396  SQ5PTZ OT4R RR73 (x2)
082915 -12 1838  OT4R IV3TUO R+04 (x2)
090800 -22 1459  OE1AVO OT4R +10
092045 -10 1460  OT4R F4ETS R-13 (x2)
131830 -18 1502  OT4R F5THL R-03 (x2)
083130 -16 1398  OT4R IT9CMZ 73
085245 -22 1905  OT4R IU8QRL R-04
114715 -12 2394  OT4R D2ACE 73
092100 -22 1528  OK1HWS OT4R -04 (x2)
130800 -24 1391  <...> OT4R -13

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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