SA4JAJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO79

Receiver-side FT8 activity involving SA4JAJ, decoded by SO8OO in southeastern Poland. 123 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 12 UTC dates in the available aggregate history. Observed between 2026-07-04 and 2026-09-12.

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 123 FT8 messages attributed to SA4JAJ 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 (85%), followed by 40 m (11%) and 20 m (4%). Several six-hour UTC windows tied for the largest share (98%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

123

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

80m · 105 40m · 13 20m · 5

First attributed message: 2026-07-04
Last attributed message: 2026-09-12 19:29 UTC

Observed FT8 message patterns

Attributed sample: 123 messages
Active dates: 12 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -23 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 48, moderate (-15 to -9 dB) 58, strong (≥ -8 dB) 17.

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 SA4JAJ in decoded directed-looking exchanges:

9A3K · Croatia ×2 SM5KNV · Sweden A61QQ · United Arab Emirates C91RU · Mozambique CN2DX · Morocco F1PPH · France HL2CFY · Republic of Korea JA0LFV · Japan JA4FKX · Japan LU1FIV · Argentina DH0GBC · Fed. Rep. of Germany DK7ZT · 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 SA4JAJ

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: JO79 · 67 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,148 km (approx.)
Last such locator decoded: 2026-09-12 19:29 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	SA4JAJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-13 09:26	40m	- / -16	SP1LJZ	-13 / -	3	✓ Closing fragment
09-05 19:21	40m	-18 / -5	EX7CQ	-4 / -6	4	✓ Full exchange observed
08-29 20:18	40m	-14 / -10	PC2J	-1 / -	4	✓ Closing observed
08-29 20:02	80m	-9 / -9	OK1UOZ	+10 / -	5	✓ Closing observed
08-29 19:58	80m	- / +3	OH/SM5MRW	-11 / -	4	✓ Closing fragment
08-29 19:58	80m	- / -11	RU3DNN	+13 / -	3	✓ Closing fragment
08-29 19:40	160m	- / -11	R3DPH	0 / -	2	Partial capture
08-29 19:37	160m	- / -20	R3DPH	-4 / -	2	Partial capture
08-29 18:36	160m	- / -19	SM5KNV	-8 / -	2	✓ Closing fragment
08-22 07:56	40m	- / -10	UT4PA	+4 / -	4	✓ Closing fragment
08-22 07:51	40m	- / -	UT4PA	+4 / -	2	Partial capture
08-22 07:50	40m	- / -	F1HFP	-10 / -	4	Partial capture
08-22 07:45	40m	- / -18	F4LNM	-9 / -	5	Partial capture
08-22 07:45	40m	- / -	PA2RO	-14 / -	5	Partial capture
08-21 20:15	20m	-10 / -	C91RU	- / -11	3	✓ Closing fragment
08-15 20:36	80m	-21 / -	MM0DHQ	-17 / -9	3	✓ Closing observed
08-15 20:29	80m	-12 / -18	SP5DFK/QRP	-4 / -13	5	Partial capture
08-15 20:25	80m	- / -8	SM6MUY	+13 / -	2	✓ Closing fragment
08-15 20:07	80m	-10 / -	8S2DX	- / -11	3	✓ Closing fragment
08-15 19:59	80m	-4 / -11	HA3GO	+1 / -5	6	✓ Full exchange observed
08-15 19:56	80m	-8 / +4	DL1EDR	+2 / -13	7	Partial capture
07-31 21:22	40m	- / -3	DH0GBC	-4 / -	5	✓ Closing fragment
07-31 21:22	40m	- / +1	SP9MRP	-8 / -	8	✓ Closing fragment
07-31 21:21	40m	-24 / -	OZ5AGJ	-22 / -4	3	✓ Full exchange observed
07-31 21:19	40m	-23 / +2	RD3FY	-17 / -	4	✓ Closing observed
07-31 21:09	40m	- / -18	RL3K	-13 / -	3	✓ Closing fragment
07-31 20:37	40m	- / -15	F5RRS	-14 / -	3	✓ Closing fragment
07-31 20:29	40m	- / -2	R5DK	-15 / -	3	✓ Closing fragment
07-31 20:24	40m	- / -12	HA7TM	+1 / -	5	✓ Closing fragment
07-31 20:20	40m	- / -	DH2YBG	-6 / -	6	Partial capture
07-31 20:20	40m	- / -14	HG8LXL	-11 / -	3	✓ Closing fragment
07-30 21:54	20m	- / -18	LU1FIV	-4 / -	2	✓ Closing fragment
07-30 21:48	20m	- / -25	DM4GG	-18 / -	4	Partial capture
07-30 21:44	20m	- / -7	HL2CFY	-12 / -	2	✓ Closing fragment
07-30 21:28	20m	- / -16	3A2MW	-21 / -	4	Partial capture
07-25 19:51	20m	- / -14	UA6YW	-1 / -	2	Partial capture
07-25 19:11	20m	- / -9	9A3K	+3 / -	4	✓ Closing fragment
07-25 19:10	20m	- / -4	CN2DX	-2 / -	2	✓ Closing fragment
07-25 19:06	20m	- / -	9A3K	+16 / -	2	Partial capture
07-24 21:19	80m	-22 / -	D2UY	- / -12	5	✓ Closing fragment
07-24 21:16	80m	-24 / -	4O/YT4ZZ	- / -6	3	Partial capture
07-24 21:14	80m	-17 / -	D2UY	- / -	2	Partial capture
07-24 21:13	80m	- / -6	R2FDU	+10 / -	2	✓ Closing fragment
07-24 21:08	80m	-19 / -	R2FDU	- / -	2	Partial capture
07-24 20:59	80m	-15 / -17	4Z5AV	-21 / -14	12	✓ Full exchange observed
07-24 20:56	80m	-10 / -7	DD7EE	+3 / -6	8	✓ Full exchange observed
07-24 20:56	80m	- / -	DO9SAM	+2 / -	2	Partial capture
07-24 20:51	80m	-12 / -	4Z5AV	- / -	3	Partial capture
07-24 20:48	80m	- / -8	DO1BOC	-9 / -	3	✓ Closing fragment
07-24 20:48	80m	-12 / -13	DO1OAS	-10 / -8	6	✓ 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
201800 -16 1602  CQ SA4JAJ JO79
201815  -2 1602  SA4JAJ PC2J JO22 (x2)
201900 -14 1601  PC2J SA4JAJ RRR
201915  +0 1602  SA4JAJ PC2J 73
201945  -1 2181  SA4JAJ DK0RE JO41
192130  -4 1338  SA4JAJ EX7CQ -05
192145 -19 1341  EX7CQ SA4JAJ R-06
192200  -3 1338  SA4JAJ EX7CQ RR73
192215 -18 1341  EX7CQ SA4JAJ 73
184215 -22 1869  SV9QWC SA4JAJ JO79
192945  -8 2042  CN8NS SA4JAJ JO79
092645 -12 1608  SA4JAJ SP1LJZ JO84 (x3)

80m

UTC    dB Audio  Message
195845 +14  569  SA4JAJ RU3DNN R-11
195845  -9 1943  <SA4JAJ> OH/SM5MRW
195915 +11  569  SA4JAJ RU3DNN 73
195915 -14 1942  <SA4JAJ> OH/SM5MRW (x3)
200215  +8 1168  SA4JAJ OK1UOZ JO70 (x2)
200245 -12  564  SA4JAJ DF4FS JN48
200315  +9 1168  SA4JAJ OK1UOZ R-09
200330  -9 1170  OK1UOZ SA4JAJ RRR
200345 +10 1168  SA4JAJ OK1UOZ 73
200445 -11 2540  SA4JAJ PE0TS JO32
200630 -10 1170  CQ SA4JAJ JO79
200715  -6 2540  SA4JAJ PE0TS JO32

160m

UTC    dB Audio  Message
183600  -9  719  SA4JAJ SM5KNV -19 (x2)
193700  -4 1263  SA4JAJ R3DPH -20 (x4)

20m

UTC    dB Audio  Message
212930 -23 1859  SA4JAJ 3A2MW -10
214430 -13  642  SA4JAJ HL2CFY R-07 (x2)
214800 -16 1508  SA4JAJ IW1PVB JN44
214800 -16 1642  SA4JAJ DM4GG JO40 (x4)
215400  -4 2623  SA4JAJ LU1FIV -18 (x2)
084915 -24 2129  CQ DX SA4JAJ JO79
201545  -9  366  C91RU SA4JAJ JO79 (x4)

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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