Z31B — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: North Macedonia Most frequent locator attributed to this token: KN01

Receiver-side FT8 activity involving Z31B, decoded by SO8OO in southeastern Poland. 563 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 35 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-09-18.

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 563 FT8 messages attributed to Z31B as the transmitting token by decoded message structure across 35 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (55%), followed by 40 m (24%) and 20 m (14%). Most decodes (70%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

563
Messages attributed
35
UTC dates decoded
127
Active 15-min windows
-10 dB
Estimated median S/N

Bands

80m · 308 40m · 134 20m · 78 10m · 43
First attributed message: 2026-06-17
Last attributed message: 2026-09-18 22:39 UTC

Observed FT8 message patterns

Attributed sample
563 messages
Active dates
35 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-20 to -2 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 149, moderate (-15 to -9 dB) 182, strong (≥ -8 dB) 232.

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 Z31B 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 Z31B

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
KN01 · 291 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
940 km (approx.)
Last such locator decoded
2026-09-18 21:08 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 UTCBandZ31B S/NCounterpartCounterpart S/NMsgsCapture
09-19 00:03 40m - / -8 W1RQ -1 / - 2 ✓ Closing fragment
09-18 23:47 40m - / - BH4GUU -19 / - 4 Partial capture
09-18 23:46 40m - / -14 V47YA -10 / - 2 ✓ Closing fragment
09-18 22:38 80m -11 / -11 RM8T -8 / - 3 ✓ Closing observed
09-18 22:38 80m - / - DO3LZ -7 / - 3 Partial capture
09-18 22:37 80m -5 / - RY3F -5 / -18 3 ✓ Closing observed
09-18 22:37 80m - / - F5UTN -1 / - 7 Partial capture
09-18 22:36 80m -4 / -18 RN2F +7 / -14 3 ✓ Full exchange observed
09-18 21:10 80m - / - RD9M/3 -16 / - 2 Partial capture
09-18 21:09 80m - / - F5UTN -7 / - 3 Partial capture
09-18 21:09 80m - / -20 R7KKO -8 / - 2 Partial capture
09-18 21:08 80m -13 / - TA4RC - / -11 3 ✓ Closing fragment
09-18 21:03 80m - / - EW1ADF -6 / - 2 Partial capture
09-18 21:03 80m - / -15 R2HX -2 / - 2 ✓ Closing fragment
09-18 21:01 80m - / - F5UTN -10 / - 3 Partial capture
09-18 21:01 80m - / -20 R7KKO -9 / - 3 Partial capture
09-18 20:58 80m - / -18 EW2ZC +5 / - 3 Partial capture
09-17 20:56 40m -14 / - JR3NZC - / -19 2 Partial capture
09-17 20:19 40m -13 / - JR1IZM - / -18 3 ✓ Closing fragment
09-17 18:03 40m - / - R6LPF +3 / - 3 Partial capture
09-17 18:01 40m -10 / - J48S - / -6 2 Partial capture
09-14 17:59 80m -11 / - ZS1J - / - 18 Partial capture
09-14 17:49 80m -7 / - ZS1J - / -19 9 Partial capture
09-13 19:00 40m -14 / - SP5MXZ - / -16 2 ✓ Closing fragment
09-13 18:53 40m - / - 9A2AJ 0 / - 2 ✓ Closing fragment
09-13 18:47 40m - / +3 OK5MIK +3 / - 3 ✓ Closing fragment
09-13 18:45 40m - / -9 R6LPF -2 / - 2 Partial capture
09-13 18:44 40m - / -8 F6FHO +9 / - 3 ✓ Closing fragment
09-13 18:43 40m - / 0 OE3UKW +15 / - 2 ✓ Closing fragment
09-12 23:11 40m - / -7 K2ZJ +6 / - 2 ✓ Closing fragment
09-10 04:26 40m -18 / - XE1YD - / -13 3 ✓ Closing fragment
09-09 23:39 40m - / -7 K4DND -3 / - 2 ✓ Closing fragment
09-09 23:32 40m - / -8 CR7BRV -6 / - 2 ✓ Closing fragment
09-09 23:32 40m - / - K1PCN -16 / - 2 Partial capture
09-09 23:03 80m - / -9 DJ3JD +8 / - 3 ✓ Closing fragment
09-09 23:03 80m - / -14 RW9AW +1 / - 3 ✓ Closing fragment
09-09 23:02 80m - / - OH3GBW -5 / - 3 Partial capture
09-09 22:58 80m - / - ON4ZD -10 / - 2 Partial capture
09-09 22:57 80m -15 / -4 SP9TBT +4 / -13 5 ✓ Full exchange observed
09-09 21:11 80m -11 / - 5Z4VJ - / - 11 Partial capture
09-09 21:02 80m -16 / - 5Z4VJ - / - 4 Partial capture
09-09 00:05 40m - / - EA1AGM -22 / - 4 Partial capture
09-09 00:00 40m - / - NP4L -13 / - 6 Partial capture
09-08 23:59 40m - / -7 LU1AW -4 / - 6 Partial capture
09-08 23:54 40m - / -13 VO1AW -22 / - 2 Partial capture
09-08 00:44 40m - / -16 VU2MSA -14 / - 3 ✓ Closing fragment
09-07 23:47 40m - / +4 VO1GAM -10 / - 5 Partial capture
09-07 23:44 40m - / -14 K1BZ -6 / - 5 ✓ Closing fragment
09-07 23:29 40m -20 / - PP5CG - / - 2 Partial capture
09-05 21:51 40m -6 / +5 IU1VEY -2 / -13 5 ✓ 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
202045 -12 2077  JR1IZM Z31B RR73
202145 -10 2077  CQ Z31B KN01
202700  -9 2077  UF6V/UA5D Z31B -15
202715  -8 2939  Z31B SV9/TF1OL R-04
205630 -13 2078  JR3NZC Z31B -19 (x2)
234615  -8  896  Z31B V47YA R-14 (x2)
234715 -19 1540  Z31B BH4GUU NL49 (x4)
235615  -2 2139  Z31B KE4EB 73
000345  +2 1308  Z31B W1RQ R-08 (x2)
80m 
UTC    dB Audio  Message
223730  -5 2100  RY3F Z31B R-18
223745  -5 2101  Z31B RY3F RR73
223745  -1 2752  Z31B F5UTN JN08
223800  -5 2101  RY3F Z31B 73
223815  -2 2752  Z31B F5UTN JN08
223815  -7 1248  Z31B DO3LZ JN49
223845  -8 1850  Z31B RM8T R-11
223845  -1 2751  Z31B F5UTN JN08
223845  -7 1249  Z31B DO3LZ JN49
223900 -11 2100  RM8T Z31B RR73
223915  -7 1850  Z31B RM8T 73
223915  -2 2752  Z31B F5UTN JN08
223915  -7 1249  Z31B DO3LZ JN49
223945  -1 2752  Z31B F5UTN JN08 (x2)
20m 
UTC    dB Audio  Message
155745 -13 1313  Z31B MD0CCE +00
194515 -23 2132  Z31B KE4EB +18 (x3)
210615 -18 1244  Z31B PT2TF -12
211115 -15 1766  Z31B PY2XAT RR73
211900 -11 1616  Z31B PY2VN RR73
213100 -16 1743  Z31B ZY7F R-13 (x6)
180400  -9 2217  Z31B YB6XFI RR73
180645 -13 2308  Z31B BG5GEB -06
10m 
UTC    dB Audio  Message
194615 -18 2130  HI8R Z31B 73
194730  +1  840  Z31B DL8NW JO30 (x5)
173130  -5  597  Z31B IN3KXV JN56
201715 -15 2355  Z31B PY7XC -15 (x2)
121045 -20 2135  <...> Z31B KN01 (x4)
183500 -22 2133  UN0GY Z31B KN01
183900 -23 1518  Z31B RK6OQ KN87

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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