SM4YZV — 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: Sweden Most frequent locator attributed to this token: JP70

Receiver-side FT8 activity involving SM4YZV, decoded by SO8OO in southeastern Poland. 50 FT8 messages attributed to this token as transmitter, on 80m, across 8 UTC dates in the available aggregate history. Observed between 2026-09-17 and 2026-10-28.

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 50 FT8 messages attributed to SM4YZV as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (100%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (62%); the estimated median was -19 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-19 dB

Estimated median S/N

Bands

80m · 50

First attributed message: 2026-09-17
Last attributed message: 2026-10-28 23:55 UTC

Observed FT8 message patterns

Attributed sample: 50 messages
Active dates: 8 UTC dates
Estimated median S/N: -19 dB
Estimated 10th-90th percentile: -24 to -11 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 31, moderate (-15 to -9 dB) 17, strong (≥ -8 dB) 2.

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 SM4YZV in decoded directed-looking exchanges:

F1PBZ · France ×2 F4BYA · France F4ESO · France DA6DNA · Fed. Rep. of Germany DH1KJ · Fed. Rep. of Germany DO1OAS · Fed. Rep. of Germany DO1SWC · Fed. Rep. of Germany DO5HOK · Fed. Rep. of Germany DO8JB · Fed. Rep. of Germany F1OBJ · France F4IKA · France F5MYK · France

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 SM4YZV

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: JP70 · 26 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,249 km (approx.)
Last such locator decoded: 2026-10-28 23:55 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	SM4YZV S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-28 23:55	80m	-14 / -18	RX3ASQ	+6 / -	4	✓ Closing observed
10-28 23:54	80m	- / -10	PI4DX	+10 / -	6	Partial capture
10-28 23:43	80m	- / -10	F1OBJ	+1 / -	2	✓ Closing fragment
10-27 23:45	80m	- / -15	G4DZE	-2 / -	2	✓ Closing fragment
10-27 23:41	80m	-16 / -17	PA3EVY	+10 / -3	4	✓ Full exchange observed
10-26 23:38	80m	-24 / -22	SM7TZK	+2 / -	4	✓ Closing observed
10-26 23:34	80m	-24 / -12	DO9FR	-3 / -	2	Partial capture
10-26 23:31	80m	- / -	F4IKA	-2 / -	3	✓ Closing fragment
10-26 23:27	80m	-24 / -15	DA6DNA	+13 / -	3	✓ Closing observed
10-26 23:25	80m	-24 / -19	SM7TZK	0 / -	4	Partial capture
10-25 01:13	60m	- / -	PE1NPS	+11 / -	3	Partial capture
10-25 01:07	60m	- / -	PE1NPS	+4 / -	3	Partial capture
10-22 15:11	40m	- / -	DK4RH	-7 / -	5	Partial capture
10-14 22:34	80m	-20 / -24	DO8JB	-5 / -10	11	✓ Full exchange observed
10-14 22:32	80m	- / -13	SP4MSY	+12 / -	2	✓ Closing fragment
10-14 22:31	80m	-11 / -9	SP1MGM	+13 / -	4	✓ Closing observed
10-13 22:26	40m	- / -11	F4ESO	-5 / -	3	✓ Closing fragment
10-08 21:58	80m	- / -16	DL3JHK	-12 / -	3	Partial capture
10-08 21:53	80m	- / -24	PC2J	-4 / -	5	✓ Closing fragment
10-01 22:43	80m	-24 / -	MW0UAA	- / -	2	✓ Closing fragment
10-01 22:37	80m	-15 / -	LB7UK	- / -13	2	Partial capture
10-01 22:36	80m	-19 / -	DL1UDO	- / -5	2	Partial capture
10-01 22:19	40m	- / -13	F4BYA	+10 / -	4	✓ Closing fragment
09-30 22:35	80m	-13 / -16	DO1SWC	-12 / -16	7	✓ Full exchange observed
09-30 22:34	80m	- / -14	RN2F	+2 / -	2	✓ Closing fragment
09-30 22:29	80m	-15 / -19	DH1KJ	+7 / -	7	✓ Closing observed
09-30 22:24	80m	- / -15	F1PBZ	-3 / -	4	✓ Closing fragment
09-30 22:24	80m	- / -9	UR1CCT	+16 / -	3	✓ Closing fragment
09-29 22:29	80m	- / -	DO1OAS	-8 / -	2	✓ Closing fragment
09-20 13:27	40m	- / -6	OK1STK	-7 / -	7	Partial capture
09-18 23:09	80m	- / -7	OH3GBW	+1 / -	3	✓ Closing fragment
09-17 22:45	80m	- / -	DL6RS	+3 / -	4	Partial capture
09-17 22:45	80m	-21 / -17	OH2FQV	-4 / -	4	✓ Closing observed
09-17 22:42	80m	- / -	DK2MAX	+10 / -	3	Partial capture
09-17 22:39	80m	-20 / -14	DO5HOK	0 / -	3	✓ Closing observed
09-17 22:34	80m	-8 / -8	F5MYK	-11 / -13	5	✓ Full exchange observed
09-17 22:34	80m	-15 / -18	ON4MAP	-17 / -17	9	✓ Full exchange observed
09-17 22:18	40m	- / -15	F1PBZ	+5 / -	6	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
234330  -1 1507  SM4YZV F1OBJ -10 (x2)
234545 -14 1818  4X1UF SM4YZV JP70
234615 -20 1818  TA1MB SM4YZV JP70
234715 -14 1818  ON1BH SM4YZV JP70
235415  +8  964  SM4YZV PI4DX -10 (x3)
235530 -14 2244  RX3ASQ SM4YZV JP70
235545  +6  964  SM4YZV PI4DX -10 (x2)
235645  +9 1076  SM4YZV RX3ASQ -18
235645 +13  964  SM4YZV PI4DX -10
235715 +11 1076  SM4YZV RX3ASQ -18 (x2)

60m

UTC    dB Audio  Message
010730  +6  433  SM4YZV PE1NPS JO22 (x6)

40m

UTC    dB Audio  Message
133145  -8 1899  SM4YZV OK1STK R-06 (x3)
221915  +9 2884  SM4YZV F4BYA JN19 (x4)
222615  -4 1456  SM4YZV F4ESO JN39 (x3)
151115  -9 2446  SM4YZV DK4RH JO31 (x5)

20m

UTC    dB Audio  Message
105015 -10  567  SM4YZV IU2THY R+09

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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