F4ISR — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JO10

Receiver-side FT8 activity involving F4ISR, decoded by SO8OO in southeastern Poland. 566 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 42 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-18.

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 566 FT8 messages attributed to F4ISR as the transmitting token by decoded message structure across 42 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (36%), followed by 60 m (22%) and 20 m (18%). Several six-hour UTC windows tied for the largest share (99%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11.1 dB.

Overview

566

Messages attributed

UTC dates decoded

Active 15-min windows

-11.1 dB

Estimated median S/N

Bands

160m · 205 80m · 69 60m · 125 40m · 47 20m · 102 10m · 18

First attributed message: 2026-06-06
Last attributed message: 2026-10-18 20:59 UTC

Observed FT8 message patterns

Attributed sample: 566 messages
Active dates: 42 UTC dates
Estimated median S/N: -11.1 dB
Estimated 10th-90th percentile: -19.9 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 149, moderate (-15 to -9 dB) 214, strong (≥ -8 dB) 203.

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 F4ISR in decoded directed-looking exchanges:

DL9KM · Fed. Rep. of Germany ×3 UT7UA · Ukraine ×2 OH1LA · Finland ×2 DL2YMG · Fed. Rep. of Germany ×2 F5OZC · France ×2 VE1YX · Canada ×2 9A5AFP · Croatia DC0GL · Fed. Rep. of Germany DD7EE · Fed. Rep. of Germany DG5IBS · Fed. Rep. of Germany DJ3JD · 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 F4ISR

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: JO10 · 297 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,335 km (approx.)
Last such locator decoded: 2026-10-18 20:59 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	F4ISR S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-18 20:52	40m	-19 / -12	CT7AXN	-7 / -	5	✓ Closing observed
10-18 20:52	40m	-13 / -	F5SJC	-5 / -9	4	✓ Full exchange observed
10-15 20:17	160m	- / -8	DL4BBY	-2 / -	2	✓ Closing fragment
10-15 20:07	80m	-12 / -8	DO8JB	+2 / +8	6	✓ Full exchange observed
10-15 20:06	80m	-2 / +5	DK8CX	+13 / -5	5	✓ Full exchange observed
10-15 20:03	80m	-12 / +3	DK6WS	-7 / +3	5	✓ Full exchange observed
10-15 20:03	80m	-12 / -6	DO2HC	0 / -2	5	✓ Full exchange observed
10-11 21:49	160m	- / -19	DL8SBD	0 / -	3	Partial capture
10-11 21:32	160m	-12 / -18	LA9JKA	-12 / -2	11	✓ Full exchange observed
10-11 21:28	160m	- / -4	F1PBZ	-8 / -	2	✓ Closing fragment
10-06 20:40	40m	- / -14	UA4FKT	-1 / -	4	✓ Closing fragment
10-04 20:48	60m	- / -	OM1AGE	-7 / -	6	Partial capture
10-04 20:47	60m	-12 / +5	DL2VN	-5 / +3	5	✓ Full exchange observed
10-04 20:43	60m	-14 / -	OH6EPM	- / -14	2	✓ Closing fragment
10-04 20:42	60m	-14 / 0	M0PEL	+1 / +5	5	✓ Full exchange observed
10-04 20:40	60m	-12 / -3	IW2CAK	-8 / -5	4	✓ Full exchange observed
10-04 20:37	60m	-13 / -8	EC3A	-12 / -5	4	✓ Full exchange observed
10-04 20:34	60m	-11 / -	EG1FAP	-14 / +9	2	✓ Closing observed
10-04 20:33	60m	-14 / -5	DL3BH	-9 / +1	9	✓ Full exchange observed
10-04 20:31	60m	-18 / -23	G0ACQ	-4 / +3	4	✓ Full exchange observed
10-04 20:29	60m	-15 / -	DL9KM	- / +3	2	✓ Closing fragment
10-04 20:26	60m	-13 / -5	OH1LA	-14 / -6	5	✓ Full exchange observed
10-04 20:23	60m	-19 / -13	DK7UY	+4 / -	5	✓ Closing observed
10-04 20:23	60m	-16 / -15	DL7ACA	+12 / +1	5	✓ Full exchange observed
09-30 21:31	60m	-13 / -10	EA5JKT	-16 / +2	5	✓ Full exchange observed
09-30 21:27	60m	-10 / -19	VE1YX	-13 / +5	11	✓ Full exchange observed
09-30 21:24	60m	-9 / -4	F4GIH	-8 / -6	5	✓ Full exchange observed
09-30 21:19	60m	-11 / -	TF8KW	-14 / -3	9	✓ Closing observed
09-30 20:50	60m	-12 / -	EA3DM	- / -4	2	✓ Closing fragment
09-30 20:46	60m	-11 / 0	PC2J	-1 / +9	6	✓ Full exchange observed
09-30 20:44	60m	- / -8	SP3JHZ	-3 / -	3	✓ Closing fragment
09-30 20:42	60m	-8 / -5	F1IQH	-5 / +4	6	✓ Full exchange observed
09-30 20:41	60m	-9 / +2	DL9DBF	-14 / -3	8	✓ Full exchange observed
09-28 20:12	160m	-8 / -	IZ8FWN	- / -	3	Partial capture
09-28 20:11	160m	-7 / -	HS0ZOY	- / -	2	Partial capture
09-25 21:06	160m	-10 / -20	UT7UA	+13 / -19	16	✓ Full exchange observed
09-23 21:25	160m	-17 / +5	DK7ZT	-2 / -3	6	✓ Full exchange observed
09-20 20:39	160m	-22 / -	DL0ABT	- / -18	3	✓ Closing fragment
09-20 20:33	160m	- / -4	SP3BPU	+14 / -	2	✓ Closing fragment
09-15 20:22	40m	-7 / -	OH1LA	- / +4	4	✓ Closing fragment
09-15 20:20	40m	- / -	TA4SSK	-4 / -	3	Partial capture
09-15 20:08	60m	-24 / +7	F5OZC	-3 / -	5	✓ Full exchange observed
09-15 20:06	60m	-22 / -4	OM3PR	-11 / -	4	✓ Closing observed
09-15 20:06	60m	-22 / -2	SP9DWT	-15 / +5	7	✓ Full exchange observed
09-11 20:51	160m	-16 / -7	SP2GRP	0 / -	4	✓ Closing observed
09-11 20:49	160m	- / -	DO3PKE	-18 / -	4	Partial capture
09-11 20:41	160m	- / 0	DO3VE	-6 / -	3	✓ Closing fragment
09-11 20:35	160m	- / -25	SP3RK	-4 / -	2	Partial capture
09-11 20:30	160m	- / -21	SP3RK	-14 / -	4	Partial capture
09-11 20:24	160m	- / -6	F8CRS	-18 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
205245  -8 2054  F4ISR F5SJC JN05
205245  -3 1540  F4ISR CT7AXN IM59
205300 -13 2053  F5SJC F4ISR -09
205315  -4 2054  F4ISR F5SJC R+14 (x2)
205345  -9 1541  F4ISR CT7AXN IM59 (x2)
205500 -19 2054  CT7AXN F4ISR RR73
205515  -8 1541  F4ISR CT7AXN 73
205600 -14 2053  CQ F4ISR JO10 (x3)
205830 -19 2054  EA3IVB F4ISR -16
205900 -14 2054  CQ F4ISR JO10 (x2)

160m

UTC    dB Audio  Message
213600 -11  980  LA9JKA F4ISR JO10 (x4)
214045 -13  980  CQ F4ISR JO10 (x4)
214900  -1  755  F4ISR DL8SBD JN49 (x3)
201400 -18 1976  F4ISR DC0GL RR73
201545 -10  482  SN5N F4ISR JO10
201700  +2  481  F4ISR DL4BBY -08 (x2)

80m

UTC    dB Audio  Message
200445 -12  479  DK6WS F4ISR 73
200515  -8  479  CQ F4ISR JO10                         a1 (x2)
200600 +12  479  F4ISR DK8CX JO61
200615  +3  479  DK8CX F4ISR -05
200630 +11  479  F4ISR DK8CX R+05
200645  -6  479  DK8CX F4ISR RR73
200700 +17  479  F4ISR DK8CX 73
200715  -6  478  CQ F4ISR JO10
200730  -9  479  F4ISR DO8JB JO32 (x2)
200815 -10  479  DO8JB F4ISR +08
200830  +4  479  F4ISR DO8JB R-08
200845 -15  478  DO8JB F4ISR RR73
200900  +6  479  F4ISR DO8JB 73

60m

UTC    dB Audio  Message
204500 -17 1267  CQ F4ISR JO10 (x4)
204715  +0  966  F4ISR DL2VN JO51
204730 -12 1267  DL2VN F4ISR +03
204745 -11  966  F4ISR DL2VN R+05
204800 -12 1267  DL2VN F4ISR RR73
204815 -10 2605  F4ISR OM1AGE JN88
204815  -3  966  F4ISR DL2VN 73
204845  -7 2605  F4ISR OM1AGE JN88 (x5)

20m

UTC    dB Audio  Message
212230  -5 2925  CQ F4ISR JO10
212245  +4 2576  F4ISR F1PBZ -01
212315  -5 2927  F4ISR JA1PSS PM96 (x2)
212400 -10 2925  JA1PSS F4ISR RR73
212500  -8 2946  CQ F4ISR JO10                         a1
212600 -10 2947  K4YT F4ISR -07
212645 -13 2946  F4ISR K4YT FM19 (x3)
212800  -8 2997  K4YT F4ISR -07 (x2)
213200  -7 2925  CQ F4ISR JO10 (x3)

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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