ON5PU — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving ON5PU, decoded by SO8OO in southeastern Poland. 320 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-21.

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 320 FT8 messages attributed to ON5PU as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (77%), followed by 20 m (10%) and 80 m (9%). Several six-hour UTC windows tied for the largest share (98%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (75%); the estimated median was -5 dB.

Overview

320

Messages attributed

UTC dates decoded

Active 15-min windows

-5 dB

Estimated median S/N

Bands

80m · 28 60m · 247 40m · 3 20m · 32 10m · 10

First attributed message: 2026-06-07
Last attributed message: 2026-09-21 17:50 UTC

Observed FT8 message patterns

Attributed sample: 320 messages
Active dates: 13 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -11 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 11, moderate (-15 to -9 dB) 68, strong (≥ -8 dB) 241.

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 ON5PU in decoded directed-looking exchanges:

GX3RAF/P · England ×3 HA0GZ · Hungary ×2 M0EBM · England ×2 OZ2BX · Denmark ×2 BH4ECL · China E25IJJ · Thailand EA2BHE · Spain F4PCM · France UX7QV · Ukraine YO5PHL · Romania C31KC · Andorra DC5IU · Fed. Rep. of Germany

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 ON5PU

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 · 179 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,192 km (approx.)
Last such locator decoded: 2026-09-21 17:48 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	ON5PU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 17:50	60m	-1 / -4	SP5JMA	+6 / -6	3	Partial capture
09-21 17:48	60m	+3 / +6	GX3RAF/P	-9 / +6	5	✓ Full exchange observed
09-21 17:45	60m	+2 / +1	OZ9FF	-4 / +5	8	✓ Full exchange observed
09-20 20:11	60m	-9 / +4	G6PWS	-14 / -	5	✓ Full exchange observed
09-20 20:09	60m	-10 / -	IK3/UY7LA	- / -6	2	Partial capture
09-20 20:04	60m	-7 / -	F/PA2JWN	- / -	5	Partial capture
09-20 20:02	60m	-4 / -	C31KC	-21 / -1	5	✓ Closing observed
09-20 20:00	60m	- / -2	G1XOW	+10 / -	2	Partial capture
09-20 19:59	60m	0 / 0	DL1RAZ	-11 / +6	5	✓ Full exchange observed
09-20 19:57	60m	0 / -7	YT5DEY	-10 / -16	6	✓ Full exchange observed
09-20 19:56	60m	-2 / -	SQ9KM	- / -12	2	✓ Closing fragment
09-20 19:54	60m	-2 / -	IK2TPX	-16 / +10	5	✓ Full exchange observed
09-20 19:53	60m	- / +10	F1PBZ	-8 / -	3	Partial capture
09-20 19:52	60m	-2 / +2	DL6EL	-9 / +2	5	✓ Full exchange observed
09-20 19:51	60m	-4 / -	OE3UKW	+4 / -1	4	✓ Full exchange observed
09-20 19:48	60m	-1 / -	M0EBM	-19 / +3	5	✓ Closing observed
09-16 19:51	60m	+2 / -	OZ/DF4ZL	- / -20	2	Partial capture
09-16 19:50	60m	0 / 0	LA9CAA	-7 / +5	4	✓ Full exchange observed
09-16 19:31	60m	-2 / -	UB3BDJ/6	- / +3	3	Partial capture
09-16 19:29	60m	-3 / -	GX3RAF/P	-15 / +6	4	✓ Closing observed
09-16 19:27	60m	-2 / -	PA0GSP	-13 / -	7	✓ Full exchange observed
09-16 19:24	60m	+1 / +7	SP3JZR	-2 / -11	7	✓ Full exchange observed
09-16 19:20	60m	-2 / -11	II7IABB	-19 / -2	3	Partial capture
09-16 19:19	60m	-1 / -	II8IHBC	- / -10	3	Partial capture
09-16 19:15	60m	+1 / +6	II9IAGM	0 / -12	6	Partial capture
09-16 19:15	60m	0 / -	OZ/DG4BRT	- / -1	2	Partial capture
09-08 18:50	60m	-6 / -	F8CRS	- / -13	2	Partial capture
09-08 18:48	60m	-5 / +2	GW4JBQ	-14 / +5	5	✓ Full exchange observed
09-08 18:42	60m	-1 / -	DC5IU	- / -14	2	✓ Closing fragment
09-08 18:41	60m	+2 / -	5A1AL	- / -	4	Partial capture
09-08 18:39	60m	+6 / +3	LA1HW	-19 / 0	5	✓ Full exchange observed
08-25 20:38	80m	-1 / -	HB9EKJ	- / -13	3	✓ Closing fragment
08-25 20:37	80m	-6 / -4	DK8HC	+4 / -3	6	✓ Full exchange observed
08-25 20:35	80m	-2 / -10	OZ/KD0NDU	+2 / +3	4	Partial capture
08-25 20:28	80m	-9 / -	<...>	- / -	12	Partial capture
08-25 20:25	80m	-12 / -	OZ/KD0NDU	- / -	2	Partial capture
08-25 20:22	80m	-9 / -	HB3YPJ	- / -1	3	Partial capture
08-25 20:18	80m	-17 / +6	LA2GCA	-16 / 0	5	✓ Full exchange observed
08-25 20:16	80m	- / -11	RA3GZ	-5 / -	2	✓ Closing fragment
08-25 20:04	60m	-3 / -6	ER1CW	-14 / -10	5	✓ Full exchange observed
08-25 20:02	60m	-4 / +1	YU7VK	-11 / -5	5	✓ Full exchange observed
08-25 19:58	60m	-1 / -	<...>	- / -	4	Partial capture
08-25 19:55	60m	-7 / -	DL9NN	- / +1	3	✓ Closing fragment
08-25 19:54	60m	-5 / -	DG7ABL	- / -14	3	✓ Closing fragment
08-25 19:50	60m	-7 / +3	OZ2BX	-8 / +10	4	✓ Full exchange observed
08-25 19:48	60m	- / -	DL7FE	-13 / -	3	Partial capture
08-25 19:47	60m	-11 / -6	SQ3TR	+1 / -15	6	✓ Full exchange observed
08-25 19:46	60m	- / -	DF6QN	-4 / -	2	Partial capture
08-25 19:45	60m	-7 / -	EA1FNT	- / -11	4	✓ Closing fragment
08-25 19:43	60m	-7 / -1	DM5JBN	+3 / +8	5	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
174615  +3 1075  OZ9FF ON5PU JO21
174630  -5 2315  ON5PU OZ9FF +01
174645  +1 1075  OZ9FF ON5PU JO21
174700  -2 2315  ON5PU OZ9FF +01
174715  +1 1075  OZ9FF ON5PU R+05
174730  -5 2315  ON5PU OZ9FF RR73
174745  +3 1075  OZ9FF ON5PU 73
174830  +4 1075  GX3RAF/P ON5PU JO21
174845  -8  889  ON5PU GX3RAF/P +06
174900  +1 1075  GX3RAF/P ON5PU R+06
174915 -10  889  ON5PU GX3RAF/P RR73
174930  +3 1075  GX3RAF/P ON5PU 73
175015  +4  668  ON5PU SP5JMA KO02
175030  -1 1075  SP5JMA ON5PU -06
175045  +7  667  ON5PU SP5JMA R-04

80m

UTC    dB Audio  Message
203415  -8 2091  <...> ON5PU JO21 (x2)
203530  +1  504  ON5PU OZ/KD0NDU -10
203545  -1  503  OZ/KD0NDU ON5PU JO21
203600  +2  504  ON5PU OZ/KD0NDU -10
203615  -3  503  OZ/KD0NDU ON5PU R+03
203700  +3  566  ON5PU DK8HC JO42 (x2)
203745  -4  625  DK8HC ON5PU -03
203800  +5  566  ON5PU DK8HC R-04
203815  -8  625  DK8HC ON5PU RR73
203830  +5  566  ON5PU DK8HC 73
203845  -2  625  HB9EKJ ON5PU -13 (x3)

40m

UTC    dB Audio  Message
173500 -21 1979  ON5PU F1LPT/P +04

20m

UTC    dB Audio  Message
175630 -10 2281  CQ ON5PU JO21
175715 -11 2452  ON5PU DL3RAJ JN68
175730 -13 2281  BD7OH ON5PU R-16 (x2)
175830 -11 2281  CQ ON5PU JO21
175845 -10 2280  ON5PU F4PCM JN23
175900  -9 2280  F4PCM ON5PU +04 (x2)
180230  -5 2280  UX7QV ON5PU RR73
182145 -18 2146  <...> ON5PU JO21
182700 -10  766  ON5PU EA2BHE IN83 (x5)

10m

UTC    dB Audio  Message
184230 -16 1154  <...> ON5PU JO21 (x10)
181315  -7  489  ON5PU IK4LZH JN54

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee