Z31B — 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: North Macedonia Most frequent locator attributed to this token: KN01

Receiver-side FT8 activity involving Z31B, decoded by SO8OO in southeastern Poland. 793 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 53 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-10-29.

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 793 FT8 messages attributed to Z31B as the transmitting token by decoded message structure across 53 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (49%), followed by 40 m (25%) and 60 m (11%). Most decodes (71%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10.1 dB.

Overview

793

Messages attributed

UTC dates decoded

163

Active 15-min windows

-10.1 dB

Estimated median S/N

Bands

80m · 387 60m · 88 40m · 196 20m · 78 10m · 44

First attributed message: 2026-06-17
Last attributed message: 2026-10-29 00:39 UTC

Observed FT8 message patterns

Attributed sample: 793 messages
Active dates: 53 UTC dates
Estimated median S/N: -10.1 dB
Estimated 10th-90th percentile: -19.9 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 197, moderate (-15 to -9 dB) 290, strong (≥ -8 dB) 306.

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:

KE4EB · United States ×2 WA2ZPX · United States ×2 GM0DEQ · Scotland ×2 YO4BXX · Romania ×2 EA5FD · Spain ×2 RW9AW · Asiatic Russia ×2 CN8WK · Morocco CR7BZN · Portugal CS7BPG · Portugal UA9LAO · Asiatic Russia UA9MA · Asiatic Russia AC8MR · United States

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 · 366 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 940 km (approx.)
Last such locator decoded: 2026-10-29 00:39 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	Z31B S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-29 00:38	80m	-22 / -14	OE5GQQ	+6 / -12	5	✓ Full exchange observed
10-29 00:36	80m	-16 / -3	IK6GTF	+4 / -9	6	✓ Full exchange observed
10-29 00:35	80m	-19 / -1	ER5DX	-7 / -8	6	✓ Full exchange observed
10-29 00:35	80m	-11 / -	TA1MB	-10 / -10	4	✓ Closing observed
10-29 00:32	80m	-6 / -	SP0YAGI	- / -15	3	Partial capture
10-28 23:27	60m	- / -	N4RWG	-20 / -	2	Partial capture
10-28 23:25	60m	-13 / -8	GM0DEQ	-12 / -19	5	✓ Full exchange observed
10-28 23:22	60m	-9 / -	EW8W	- / -15	3	✓ Closing fragment
10-28 00:42	40m	- / +3	SV5BYP	-4 / -	3	Partial capture
10-27 01:19	40m	- / -10	AF3G	-10 / -	2	Partial capture
10-27 01:16	40m	- / +4	UA6LQZ	-10 / -	8	✓ Closing fragment
10-27 01:03	60m	-12 / -	C5R	- / -23	4	✓ Closing fragment
10-27 01:02	60m	-10 / -	W0GJ	- / -18	2	✓ Closing fragment
10-27 01:00	60m	-12 / -	VE2CKW	- / -25	3	✓ Closing fragment
10-27 00:59	60m	-11 / -7	EA5FD	-14 / -18	4	✓ Full exchange observed
10-27 00:56	60m	-10 / -	C5R	- / -24	6	Partial capture
10-26 23:33	80m	-12 / -15	OD5ZZ	-9 / -8	5	✓ Full exchange observed
10-26 23:28	80m	-15 / -	TK/DH7SB	- / -	2	Partial capture
10-26 23:26	80m	-16 / -10	DO9FR	-2 / -18	5	✓ Full exchange observed
10-26 23:26	80m	- / -16	R7KKO	-4 / -	2	Partial capture
10-26 23:25	80m	-12 / -2	CT2HEX	-21 / -19	4	✓ Full exchange observed
10-26 23:24	80m	-8 / -11	EA8AJ	-16 / -15	4	✓ Full exchange observed
10-26 23:21	80m	-8 / +1	OM1DMT	+22 / -	4	✓ Closing observed
10-26 23:18	80m	-10 / -	UT/WE9G	- / -	2	Partial capture
10-26 00:10	60m	- / -	DJ1MV	-5 / -	2	Partial capture
10-25 22:45	80m	-15 / -	TJ1GD	- / -18	6	Partial capture
10-25 22:37	60m	-15 / -	DK7ZT	-13 / -19	3	✓ Full exchange observed
10-24 03:42	60m	- / -5	4Z1KN	-22 / -	3	Partial capture
10-24 02:54	60m	- / -5	4Z1KN	-21 / -	20	Partial capture
10-24 02:47	60m	- / -5	4Z1KN	-21 / -	4	Partial capture
10-24 02:22	60m	- / -5	4Z1KN	-18 / -	38	Partial capture
10-24 02:02	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-24 01:48	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-24 01:38	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-24 01:34	60m	- / -5	4Z1KN	-22 / -	2	Partial capture
10-24 01:29	60m	- / -5	4Z1KN	-23 / -	3	Partial capture
10-24 01:04	60m	- / -5	4Z1KN	-21 / -	24	Partial capture
10-24 01:00	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-24 00:48	60m	- / -5	4Z1KN	-22 / -	8	Partial capture
10-24 00:34	60m	- / -5	4Z1KN	-22 / -	8	Partial capture
10-24 00:14	60m	- / -5	4Z1KN	-21 / -	26	Partial capture
10-24 00:08	60m	- / -5	4Z1KN	-21 / -	6	Partial capture
10-24 00:05	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-23 23:52	60m	- / -5	4Z1KN	-22 / -	8	Partial capture
10-23 23:47	60m	- / -5	4Z1KN	-23 / -	3	Partial capture
10-23 23:40	60m	- / -5	4Z1KN	-24 / -	2	Partial capture
10-23 23:20	60m	-8 / -	HA1SU	- / -15	2	✓ Closing fragment
10-23 23:19	60m	-5 / -	4Z1KN	- / -	6	Partial capture
10-23 23:17	60m	- / -	F6FHZ	-16 / -	3	Partial capture
10-23 23:16	60m	- / -	CT7AUT	-16 / -	6	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
003615 -14 2124  ER5DX Z31B R-08
003630  +1 1204  Z31B IK6GTF JN72
003630  -7 1663  Z31B ER5DX RR73
003645 -24 2124  ER5DX Z31B 73
003700 +10 1204  Z31B IK6GTF JN72
003715 -12 2124  IK6GTF Z31B -09
003730  +5 1204  Z31B IK6GTF R-03
003745 -20 2124  IK6GTF Z31B RR73
003800  -2  914  Z31B OE5GQQ JN78
003800  +2 1204  Z31B IK6GTF 73
003815 -21 2124  OE5GQQ Z31B -12
003830  +5  913  Z31B OE5GQQ R-14
003845 -23 2124  OE5GQQ Z31B RR73
003900 +14  913  Z31B OE5GQQ 73
003930 -12 2123  MD0CCE Z31B KN01

60m

UTC    dB Audio  Message
010315 -10 2183  C5R Z31B KN01 (x4)
232230 -14 2071  EW8W Z31B KN01 (x3)
232530  -8 2071  GM0DEQ Z31B -19
232545 -11  842  Z31B GM0DEQ R-08
232600 -16 2071  GM0DEQ Z31B -19
232615 -14  841  Z31B GM0DEQ R-08
232630 -14 2071  GM0DEQ Z31B RR73
232715 -20 2139  Z31B N4RWG EM80 (x2)
002330  -4  581  Z31B RR73; EA5JAH <...> -08

40m

UTC    dB Audio  Message
011645  -6 1679  Z31B UA6LQZ LN08
011700 -10  341  Z31B AF3G R-10
011715  -9 1678  Z31B UA6LQZ LN08 (x5)
011930 -11  341  Z31B AF3G R-10
011945 -10 2191  Z31B UA6LQZ R+04
012000 -10  340  Z31B AF3G R-10
012015  -9 2190  Z31B UA6LQZ 73
003845  -3 2165  Z31B UK8OM RR73
004215  -1  775  Z31B SV5BYP KM46 (x3)

10m

UTC    dB Audio  Message
183500 -22 2133  UN0GY Z31B KN01
183900 -23 1518  Z31B RK6OQ KN87
125945 +11 2556  Z31B CN8WK -02 (x2)
094030 -13  942  Z31B UA9LAO -12 (x2)
080700 -12  813  Z31B UA9MA 73
151200 -16 2293  Z31B D2ACE -21
151415 -22 2141  C5R Z31B KN01
142830 -20 1565  Z31B CS7BPG IN51 (x2)
160645 -12  891  Z31B CR7BZN IM58 (x4)

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

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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