SA7CHI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO65

Receiver-side FT8 activity involving SA7CHI, decoded by SO8OO in southeastern Poland. 848 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 36 UTC dates in the available aggregate history. Observed between 2026-06-19 and 2026-09-13.

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 848 FT8 messages attributed to SA7CHI as the transmitting token by decoded message structure across 36 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (76%), followed by 20 m (24%). Most decodes (67%) fell within the six-hour window 17:00-23:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12.9 dB.

Overview

848

Messages attributed

UTC dates decoded

177

Active 15-min windows

-12.9 dB

Estimated median S/N

Bands

40m · 648 20m · 200

First attributed message: 2026-06-19
Last attributed message: 2026-09-13 23:41 UTC

Observed FT8 message patterns

Attributed sample: 848 messages
Active dates: 36 UTC dates
Estimated median S/N: -12.9 dB
Estimated 10th-90th percentile: -20 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 271, moderate (-15 to -9 dB) 359, strong (≥ -8 dB) 218.

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 SA7CHI in decoded directed-looking exchanges:

5Z4VJ · Kenya ×2 A61DD · United Arab Emirates ×2 DK7ZT · Fed. Rep. of Germany ×2 DL6UM · Fed. Rep. of Germany ×2 EA6TU · Balearic Islands ×2 EA8UP · Canary Islands ×2 F4CZV · France ×2 F4HSB · France ×2 F5RRS · France ×2 GU4WRP · Guernsey ×2 IK4RVY · Italy ×2 MI0OBC · Northern Ireland ×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 SA7CHI

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: JO65 · 385 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 855 km (approx.)
Last such locator decoded: 2026-08-23 13:48 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	SA7CHI S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-13 23:40	40m	-16 / -	T46W	- / -	2	Partial capture
09-13 23:28	40m	-22 / -	HK4QXX	- / -	4	Partial capture
09-13 21:25	40m	- / -4	F3KT	-7 / -	3	✓ Closing fragment
09-13 16:29	40m	-2 / -	DL3BWG	-11 / -6	3	✓ Closing observed
09-13 16:23	40m	-8 / -4	R2EC	+12 / -8	5	✓ Full exchange observed
09-13 16:20	40m	-15 / -8	UR4CU	+6 / -	3	✓ Closing observed
09-13 16:08	40m	-6 / -	DL5AX	- / +1	2	✓ Closing fragment
09-13 16:07	40m	- / -	OE3YMM	+2 / -	2	Partial capture
09-13 16:02	40m	- / -	DP75BAC	-9 / -	3	Partial capture
09-13 16:01	40m	-11 / +4	ON7AN	-12 / -3	5	✓ Full exchange observed
09-13 15:55	40m	-2 / -	M0BEW	-10 / -	2	✓ Closing observed
09-13 15:54	40m	- / -	YO9GMI	0 / -	2	Partial capture
09-13 15:50	40m	-6 / +6	DL6UM	-7 / -15	5	✓ Full exchange observed
09-13 15:47	40m	- / -	DM3YBN	-6 / -	4	Partial capture
09-13 15:45	40m	-11 / -1	ON7IR	-20 / -30	5	✓ Full exchange observed
09-13 15:45	40m	-11 / -12	S53AK	+1 / -9	8	✓ Full exchange observed
09-13 15:42	40m	-12 / -3	US2YW	+15 / -8	5	✓ Full exchange observed
09-13 15:41	40m	-8 / -	SP2ZST	-17 / -	3	✓ Closing observed
09-13 15:36	40m	-3 / -	S53AK	-8 / -30	3	Partial capture
09-13 14:44	40m	-3 / -4	SP4NKU	-4 / -2	7	✓ Full exchange observed
09-13 14:43	40m	-4 / -	G0OYQ	- / -7	2	Partial capture
09-13 14:40	40m	-7 / -	G0OYQ	- / -7	2	✓ Closing fragment
09-13 14:36	40m	-7 / -7	PA3BMB	-9 / +1	7	✓ Full exchange observed
09-13 14:32	40m	-1 / +4	DL6ZOG	0 / -	4	✓ Closing observed
09-13 14:24	40m	- / -	DL3IAK	-10 / -	2	Partial capture
09-13 14:20	40m	-10 / -5	YO2MHF	-2 / -5	20	✓ Full exchange observed
09-13 14:18	40m	-4 / -4	DK1XAM	-15 / -	2	✓ Closing observed
09-13 14:17	40m	- / -	YO5IB	-6 / -	2	Partial capture
09-13 14:14	40m	-12 / -	DL1YFS	-17 / +2	5	✓ Closing observed
09-13 13:59	40m	-12 / -	DL9KM	-9 / -5	7	Partial capture
09-13 13:58	40m	- / -9	UA3QNA	+1 / -	2	✓ Closing fragment
09-13 13:56	40m	-12 / -	YL3GAO	-9 / -	4	✓ Closing observed
09-13 13:53	40m	-14 / -	PA5MR	- / -10	4	✓ Closing fragment
09-13 13:49	40m	- / 0	DL6CMF	-10 / -	3	✓ Closing fragment
09-13 13:45	40m	-12 / -	PA5MR	- / -10	4	Partial capture
09-13 01:35	40m	- / -11	EP2AES	-6 / -	4	✓ Closing fragment
09-13 00:44	40m	-8 / -	VU2SW	- / -	4	Partial capture
09-13 00:28	40m	-13 / -	YY4GPM	- / -	2	Partial capture
09-13 00:13	40m	-14 / -	HK4EGW	- / -	3	Partial capture
09-12 23:43	40m	-14 / -	T46W	- / -	7	Partial capture
09-12 23:25	40m	-15 / -	D2ACE	- / -	5	Partial capture
09-12 22:08	40m	-14 / -	OM3LU	- / -1	4	✓ Closing fragment
09-12 22:04	40m	- / -11	IN3LHF	+1 / -	3	✓ Closing fragment
09-12 13:39	40m	- / -10	SQ6EMJ	-5 / -	5	✓ Closing fragment
09-12 13:38	40m	-12 / -	ON1DGN	- / -3	2	✓ Closing fragment
09-12 02:11	40m	-9 / -	OA4ENG	- / -	2	Partial capture
09-12 02:07	40m	-12 / -	J38LD	- / -	2	Partial capture
09-12 01:58	40m	-10 / -	EP2AES	- / -	5	Partial capture
09-12 01:57	40m	-2 / -	OA4ENG	- / -	2	Partial capture
09-12 01:47	40m	-10 / -13	9H1ES	-3 / -12	9	✓ 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
162830  +1 1297  CQ SA7CHI
162930  -3 1298  DL3BWG SA7CHI R-06
162945 -11 1298  SA7CHI DL3BWG RR73
163000  -1 1297  DL3BWG SA7CHI 73
205715 -22 1298  SA7CHI R4HLO LO43
212515  -9 1300  SA7CHI F3KT IN97 (x3)
232115 -24 1928  FG4SU SA7CHI
232845 -24 1658  HK4QXX SA7CHI (x4)
234045 -16 2158  T46W SA7CHI J (x2)

20m

UTC    dB Audio  Message
201645 -11 1316  SA7CHI EB4DMH R-20 (x3)
121545 -12 2113  ZA5G SA7CHI J
184100  -2 1313  SA7CHI F4NBB -15 (x11)

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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