PY4ZDC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Brazil Most frequent locator attributed to this token: GH51

Receiver-side FT8 activity involving PY4ZDC, decoded by SO8OO in southeastern Poland. 81 FT8 messages attributed to this token as transmitter, on 10m, across 11 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-06-30.

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 81 FT8 messages attributed to PY4ZDC as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (100%). Most decodes (85%) fell within the six-hour window 13:00-19:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (65%); the estimated median was -13 dB.

Overview

81
Messages attributed
11
UTC dates decoded
24
Active 15-min windows
-13 dB
Estimated median S/N

Bands

10m · 81
First attributed message: 2026-06-06
Last attributed message: 2026-06-30 18:49 UTC

Observed FT8 message patterns

Attributed sample
81 messages
Active dates
11 UTC dates
Estimated median S/N
-13 dB
Estimated 10th-90th percentile
-16 to -7 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 53, strong (≥ -8 dB) 15.

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 PY4ZDC in decoded directed-looking exchanges:

Most frequent locator attributed to PY4ZDC

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
GH51 · 18 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
10,275 km (approx.)
Last such locator decoded
2026-06-29 19:47 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 UTCBandPY4ZDC S/NCounterpartCounterpart S/NMsgsCapture
08-23 18:04 10m - / -14 OD5VB -12 / - 2 Partial capture
08-21 17:00 10m - / -9 <...> -5 / - 7 Partial capture
08-20 13:20 10m - / -20 G1WQC -2 / - 3 ✓ Closing fragment
08-19 13:26 10m - / - IW1PRT -19 / - 5 Partial capture
08-19 13:24 10m - / - S59MA -1 / - 3 Partial capture
08-18 18:45 10m - / -9 IK4LZH -4 / - 3 Partial capture
08-18 17:04 10m - / - IV3AOX -8 / - 2 Partial capture
08-17 17:33 10m - / -6 UT7VW +6 / - 2 ✓ Closing fragment
08-17 17:28 10m - / - YO7ARZ -8 / - 3 Partial capture
08-16 18:54 10m - / -7 F4HEN -22 / - 3 Partial capture
08-16 18:54 10m - / - IK4LZH -5 / - 2 Partial capture
08-16 18:01 10m - / -2 UX1AA -16 / - 2 ✓ Closing fragment
08-12 19:27 10m - / -20 DF7UT -12 / - 3 Partial capture
08-12 16:31 10m - / -15 DL6ZAJ -13 / - 7 ✓ Closing fragment
08-12 16:26 10m - / - DF7EE -17 / - 5 Partial capture
08-12 13:27 10m - / - DN9CHV -14 / - 2 Partial capture
08-09 17:49 10m - / - RK6OQ -20 / - 2 Partial capture
08-09 17:47 10m - / - RA6OY -6 / - 4 Partial capture
08-09 17:37 10m - / - SV2CLJ -7 / - 3 Partial capture
08-09 17:35 10m - / -9 IK4HLQ -4 / - 5 ✓ Closing fragment
08-08 01:24 40m - / - F1IQH -8 / - 2 Partial capture
08-08 01:06 40m - / -11 UR7FM -8 / - 2 Partial capture
08-01 18:25 10m - / -12 DN9DZ -24 / - 2 Partial capture
07-29 12:37 10m - / - R6AC -24 / - 2 Partial capture
07-28 20:03 10m - / 0 IW2NUI -24 / - 2 Partial capture
07-27 13:37 10m - / -15 F1PBZ -9 / - 4 Partial capture
07-26 19:59 10m - / -13 IK4ISR +1 / - 5 ✓ Closing fragment
07-26 18:59 10m - / -9 HB10GBT -14 / - 6 Partial capture
07-24 18:59 10m - / - OZ4MK -10 / - 2 Partial capture
07-23 18:14 10m - / - LZ5XP -6 / - 2 Partial capture
07-23 17:44 10m - / -17 R3ZG -14 / - 3 Partial capture
07-22 18:21 10m - / -4 PA0GSP -20 / - 3 ✓ Closing fragment
07-22 12:30 10m - / - DL2SWA -19 / - 4 Partial capture
07-21 12:24 10m - / - IK4LZH -3 / - 3 Partial capture
07-20 16:22 10m - / -4 UA3D -22 / - 2 Partial capture
07-19 18:58 10m - / -4 IZ4VSD -15 / - 2 ✓ Closing fragment
07-19 18:48 10m - / -10 DL1DV 0 / - 3 Partial capture
07-17 17:50 10m - / -8 F6IQA -18 / - 4 Partial capture
07-17 17:38 10m - / +4 IU1NGS -17 / - 4 ✓ Closing fragment
07-10 23:20 40m - / - PC2J -10 / - 3 Partial capture
07-10 23:19 40m - / - EA2DR -17 / - 2 Partial capture
07-08 17:07 10m - / - S59MA -14 / - 2 Partial capture
07-07 20:18 10m - / -14 PE1MHY -18 / - 2 Partial capture
07-06 22:24 40m - / - UR4QWW -19 / - 3 Partial capture
07-06 22:24 40m - / -15 PI4DX -1 / - 2 ✓ Closing fragment
07-06 19:20 10m - / -13 DH3GD -4 / - 6 ✓ Closing fragment
07-02 13:05 10m - / -9 HB9RSG -14 / - 2 ✓ Closing fragment
06-30 18:49 10m -12 / - W3FAY - / -16 2 ✓ Closing fragment
06-30 18:38 10m - / - SX0W -10 / - 2 Partial capture
06-29 19:55 10m -14 / - HB9EKJ - / -1 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
132045  -1 1123  PY4ZDC G1WQC R-20 (x3)
165100 -10  501  PY4ZDC RA2FL R-14
170045  -6  874  PY4ZDC <...> -09 (x7)
172000 -23 1660  PY4ZDC IW4EGX JN64
180415 -13 1029  PY4ZDC OD5VB R-14 (x2)
192915 -12  746  PY4ZDC OZ3TEK R+04
40m 
UTC    dB Audio  Message
222430 -15 1842  PY4ZDC UR4QWW KN77
222430  -2 2010  PY4ZDC PI4DX 73
222600 -19 1842  PY4ZDC UR4QWW KN77 (x2)
231945 -19 1164  PY4ZDC EC3A -19
231945 -16 2376  PY4ZDC EA2DR IN83
232045  -6  976  PY4ZDC PC2J JO22 (x2)
232115 -18 2376  PY4ZDC EA2DR IN83
232145 -12  976  PY4ZDC PC2J JO22
232445 -17 2376  PY4ZDC EA2DR IN83
010645 -11 2527  PY4ZDC UR7FM R-11 (x2)
012445  -9  938  PY4ZDC F1IQH JN27 (x2)
20m 
UTC    dB Audio  Message
203245  +0  888  PY4ZDC DH2RL JN68

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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