OP4A — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Locator transmitted in a decoded message: JO21

Receiver-side FT8 activity involving OP4A, decoded by SO8OO in southeastern Poland. 81 related FT8 messages, 2 CQ messages, observed on 80m, 60m, 40m, 20m, across 15 UTC dates. Heard between 2026-06-05 and 2026-08-19.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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Overview

Related messages

CQ messages

UTC dates heard

-8 dB

Mean decoder S/N

Bands

80m 60m 40m 20m

First seen: 2026-06-05
Last seen: 2026-08-19 22:48 UTC

Frequent QSO partners observed at SO8OO

Stations OP4A worked most often, as logged from our receiver:

IQ9BH · Sicily ×2 EC3A · Spain ×2 TM8WWA · France DG1ROL · Fed. Rep. of Germany SA6BZZ · Sweden IQ0VT · Italy EW4DX · Belarus CU2JX · Azores R6OP · European Russia R1ZBR · European Russia SN0WWA · Poland HC2GRC · Ecuador

Activity Heatmap

Locator transmitted by OP4A

Approximate centre of JO21, decoded 2026-08-19 01:27 UTC. A transmitted locator is not proof of the operator's permanent location.

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	OP4A S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-20 00:47	60m	-23 / -12	EC3A	-14 / -	3	✓ Closing observed
08-20 00:46	60m	- / -6	SA6BZZ	-14 / -	2	✓ Closing fragment
08-19 01:29	60m	-15 / -16	SV8GXC	0 / -10	4	✓ Full exchange observed
08-19 01:27	60m	-14 / -	ER3UA	- / -7	2	Partial capture
08-19 01:24	60m	-10 / -	GB8VJ	- / -4	3	✓ Closing fragment
07-09 03:49	20m	- / -22	R6OP	-13 / -	2	✓ Closing fragment
07-09 03:43	20m	- / -14	RA6MQ	-14 / -	2	✓ Closing fragment
07-05 01:48	40m	- / -16	A71UN	-20 / -	2	Partial capture
07-03 04:01	40m	- / 0	DA0WWA	-8 / -	2	Partial capture
06-30 02:01	40m	-13 / -	CU2JX	- / -10	6	✓ Closing fragment
06-30 01:59	40m	-11 / -	3Z6I	-8 / +4	3	Partial capture
06-30 01:56	40m	-16 / -	HI4WWA	- / -12	4	✓ Closing fragment
06-30 01:53	40m	-12 / -	W4MAA	- / -14	2	✓ Closing fragment
06-30 01:50	40m	-10 / -	HI4WWA	- / -	2	Partial capture
06-30 01:48	40m	-7 / -	HC2GRC	- / -16	3	✓ Closing fragment
06-30 01:46	40m	-4 / -	TM8WWA	- / -2	3	✓ Closing fragment
06-30 01:45	40m	-18 / -	EC3A	- / -9	2	✓ Closing fragment
06-30 01:44	40m	-14 / -	CX6TU	- / -13	2	Partial capture
06-30 01:39	40m	-10 / -	KP4WWA	- / -4	2	Partial capture
06-30 01:37	40m	-11 / -	HI7WWA	- / -	3	Partial capture
06-30 01:36	40m	-10 / -	SN0WWA	- / -15	3	✓ Closing fragment
06-30 01:34	40m	-10 / 0	CS2WWA	-22 / 0	3	Partial capture
06-29 02:43	40m	- / +1	SN2WWA	-14 / -	2	✓ Closing fragment
06-29 02:39	40m	- / -1	SN1WWA	-13 / -	2	✓ Closing fragment
06-18 03:53	40m	-13 / -17	GW4BCF	-11 / +4	6	✓ Full exchange observed
06-17 04:58	40m	- / -11	IQ0OS	-11 / -	2	Partial capture
06-17 04:49	40m	- / -4	IQ0VT	-16 / -	2	✓ Closing fragment
06-16 05:06	40m	- / -8	TM1RVE	-8 / -	2	✓ Closing fragment
06-16 04:38	20m	- / -8	IQ9BH	+2 / -	3	✓ Closing fragment
06-16 03:55	40m	-8 / -	F4DVG	- / -11	3	✓ Closing fragment
06-16 03:13	40m	-10 / -4	SV7BAY	-5 / -2	5	✓ Full exchange observed
06-16 03:11	40m	-7 / -	Z62NS	- / -	3	Partial capture
06-16 03:08	40m	-12 / -	IQ7KM	-2 / -	5	✓ Closing observed
06-16 03:06	40m	-12 / -	OA4ENG	- / -	2	✓ Closing fragment
06-13 04:53	10m	+8 / -	RA3QTT	- / -4	3	✓ Closing fragment
06-13 04:52	10m	+4 / -	DO3VE	- / -	2	Partial capture
06-12 02:14	40m	-7 / -16	HB10GBT	-17 / +1	2	Partial capture
06-12 02:11	40m	-2 / -3	IQ9NI	-8 / -4	7	✓ Full exchange observed
06-12 02:09	40m	0 / -1	SV9ANC	-4 / 0	3	Partial capture
06-12 02:07	40m	-1 / -	TI5RR	- / -16	3	✓ Closing fragment
06-12 02:04	40m	0 / -	YY4GPM	- / -	2	Partial capture
06-12 02:02	40m	-2 / -	N5NXS	- / -10	2	✓ Closing fragment
06-12 02:01	40m	0 / -	KC1WZQ	- / -9	2	✓ Closing fragment
06-12 01:56	80m	-4 / -25	LZ1ZF	+6 / 0	6	✓ Full exchange observed
06-12 01:54	80m	+1 / -	DD0AM	0 / 0	4	✓ Closing observed
06-12 01:51	80m	- / -	AO314A	-10 / -	2	✓ Closing fragment
06-12 01:51	80m	-3 / -2	F4FPR	-9 / 0	9	✓ Full exchange observed
06-12 01:49	80m	0 / -	DK1MCS	+12 / -1	4	✓ Closing observed
06-12 01:47	80m	0 / -12	Z62NS	+9 / -1	6	✓ Full exchange observed
06-12 00:44	40m	0 / -	2W1FUD	- / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
012400  -9 2529  GB8VJ OP4A JO21 (x3)
012700 -15 2529  ER3UA OP4A JO21 (x2)
012915  +2  478  OP4A SV8GXC -16 (x2)
013000 -15 2529  SV8GXC OP4A R-10
013015  -3  479  OP4A SV8GXC RR73
004630 -13 1729  OP4A SA6BZZ -06 (x2)
004730 -12 1422  OP4A EC3A -12 (x2)
004815 -23 1422  EC3A OP4A 73

40m

UTC    dB Audio  Message
020145 -10 1405  CU2JX OP4A JO21 (x6)
040100 -11 1397  OP4A DA0WWA +00 (x2)
040200  -9 1397  OP4A RR73; SP9IZV <...> +18
040445  -4  347  OP4A II3DRC +00
040745 -20 1522  OP4A EA3NG -18
031730 -12 1223  OP4A TM2WWA RR73
014830 -20 2197  OP4A A71UN -16 (x2)
030900 -14 2428  OP4A SV1DKR -14

20m

UTC    dB Audio  Message
041930 +11  802  OP4A IQ9BF -20
043800  +0 1979  OP4A IQ9BH -08 (x3)
042615  +0 2661  OP4A EA5JK -19
034315 -14 2056  OP4A RA6MQ -14 (x2)
034900 -17 1170  OP4A R6OP -22 (x2)

10m

UTC    dB Audio  Message
045200  +6 2379  DO3VE OP4A JO21 (x2)
045300  +5 2379  RA3QTT OP4A JO21 (x3)

80m

UTC    dB Audio  Message
015230  -9 2297  OP4A F4FPR 73
015245  -6 2297  F4FPR OP4A JO21 (x2)
015330  +4 1659  OP4A LZ370TL -08
015345  -1 2297  F4FPR OP4A R+01
015445  -1 2297  DD0AM OP4A JO21 (x2)
015530  +0  507  OP4A DD0AM RR73
015545  +2 2297  DD0AM OP4A 73
015630  -9 2297  LZ1ZF OP4A JO21 (x2)
015715  +7 2025  OP4A LZ1ZF -25
015730  -1 2296  LZ1ZF OP4A R+00
015745  +5 2025  OP4A LZ1ZF RR73
015800  -3 2297  LZ1ZF OP4A 73

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.