OP4L — 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: Belgium Most frequent locator attributed to this token: JO20

Receiver-side FT8 activity involving OP4L, decoded by SO8OO in southeastern Poland. 33 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 11 UTC dates in the available aggregate history. Observed between 2026-06-27 and 2026-10-23.

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 33 FT8 messages attributed to OP4L as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (61%), followed by 10 m (24%) and 40 m (15%). Most decodes (88%) fell within the six-hour window 09:00-15:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

33
Messages attributed
11
UTC dates decoded
14
Active 15-min windows
-10 dB
Estimated median S/N

Bands

40m · 5 20m · 20 10m · 8
First attributed message: 2026-06-27
Last attributed message: 2026-10-23 14:14 UTC

Observed FT8 message patterns

Attributed sample
33 messages
Active dates
11 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-21 to -1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 4, strong (≥ -8 dB) 16.

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 OP4L in decoded directed-looking exchanges:

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 OP4L

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
JO20 · 27 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,194 km (approx.)
Last such locator decoded
2026-10-23 14:14 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 UTCBandOP4L S/NCounterpartCounterpart S/NMsgsCapture
10-23 13:40 40m - / +10 ON7PR -17 / - 3 Partial capture
10-23 13:39 40m - / -12 DG9SEH -8 / - 2 ✓ Closing fragment
10-22 13:57 40m - / -7 DD0IPA -14 / - 2 ✓ Closing fragment
10-22 13:43 40m - / -6 DL9WRM -18 / - 2 ✓ Closing fragment
10-22 13:36 40m - / - F6FHZ -18 / - 2 Partial capture
10-22 13:33 40m - / -7 DL70ASTRO -6 / - 2 Partial capture
10-19 13:33 40m -20 / -11 DL1ASL -17 / - 3 ✓ Closing observed
10-19 13:26 40m - / -5 PE1NAO -7 / - 4 ✓ Closing fragment
10-18 14:01 40m -18 / - PA7FB - / - 3 ✓ Closing fragment
10-18 13:56 40m - / -6 DK1HSI -12 / - 3 Partial capture
10-18 13:49 40m - / - DJ0MAB -8 / - 2 Partial capture
10-12 14:20 40m - / - 9A4ZM -4 / - 2 Partial capture
10-12 14:09 40m - / -6 DG4FFF -7 / - 4 ✓ Closing fragment
10-06 08:45 40m - / -2 DL7DL -12 / - 2 Partial capture
09-30 12:51 40m - / - HG8LXL -2 / - 4 Partial capture
09-30 12:50 40m - / -3 PD8MD -16 / - 2 ✓ Closing fragment
09-29 09:24 40m - / -12 DG1FBA -20 / - 3 Partial capture
08-31 13:06 20m -2 / - JH8SIT - / - 6 Partial capture
08-31 12:53 20m -4 / - JH8SIT - / - 8 Partial capture
08-30 13:57 40m - / -3 DL1LOL -18 / - 2 ✓ Closing fragment
08-30 09:04 20m -10 / - <...> - / -13 2 Partial capture
08-29 12:00 40m - / +4 DL8WEM -15 / - 2 ✓ Closing fragment
08-26 09:10 40m - / - DJ0MAB -11 / - 2 Partial capture
08-25 13:35 40m - / -20 OE/DG7CF -16 / - 2 Partial capture
08-25 13:00 40m - / -15 DL0IPA -17 / - 2 ✓ Closing fragment
08-22 08:53 40m - / -5 DL7ARV 0 / - 3 Partial capture
08-22 08:53 40m - / -10 DK8EW 0 / - 3 Partial capture
08-22 08:42 20m - / -15 DL2VLL 0 / - 3 Partial capture
08-20 13:59 40m - / -7 DK7ZT -12 / - 2 ✓ Closing fragment
08-20 08:07 20m - / -5 T77RN -3 / - 2 ✓ Closing fragment
08-20 08:04 20m - / -16 T77RN +2 / - 2 ✓ Closing fragment
08-11 14:01 40m - / -2 DL7VXX -16 / - 2 ✓ Closing fragment
08-11 12:52 40m - / -7 DL8NW -14 / - 2 ✓ Closing fragment
08-11 08:54 20m - / -15 YO1BRANCUSI +4 / - 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
133415  -8  532  OP4L DL70ASTRO -07
133615 -15 1266  OP4L F6FHZ JN18 (x2)
134315 -20 2132  OP4L DL9WRM -06 (x2)
135000 -23 1550  OP4L DH1HF RR73
135700 -12 1834  OP4L DD0IPA -07 (x2)
133930  -6  861  OP4L DG9SEH -12 (x2)
134030 -19 1252  OP4L ON7PR JO20 (x3)
134230  -4 1249  OP4L 9A4ZM JN86
141430 -24 1251  PC2F OP4L JO20
20m 
UTC    dB Audio  Message
124730  +2 1306  JH8SIT OP4L JO20 (x15)

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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