4Z1RZ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Israel Most frequent locator attributed to this token: KM72

Receiver-side FT8 activity involving 4Z1RZ, decoded by SO8OO in southeastern Poland. 355 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, across 45 UTC dates in the available aggregate history. Observed between 2026-06-06 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 355 FT8 messages attributed to 4Z1RZ as the transmitting token by decoded message structure across 45 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (86%), followed by 40 m (6%) and 60 m (6%). Most decodes (75%) fell within the six-hour window 01:00-07:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (70%); the estimated median was -4 dB.

Overview

355

Messages attributed

UTC dates decoded

Active 15-min windows

-4 dB

Estimated median S/N

Bands

80m · 7 60m · 21 40m · 23 20m · 304

First attributed message: 2026-06-06
Last attributed message: 2026-09-18 21:06 UTC

Observed FT8 message patterns

Attributed sample: 355 messages
Active dates: 45 UTC dates
Estimated median S/N: -4 dB
Estimated 10th-90th percentile: -14 to +9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 20, moderate (-15 to -9 dB) 87, strong (≥ -8 dB) 248.

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 4Z1RZ in decoded directed-looking exchanges:

9J2FI · Zambia A92AE · Bahrain AD8IF · United States AD9DU · United States BA6KC · China BH5HIE · China C91RU · Mozambique DL1TJ · Fed. Rep. of Germany EB3JT · Spain HC5F · Ecuador HK3YL · Colombia K0HB · 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 4Z1RZ

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: KM72 · 6 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,224 km (approx.)
Last such locator decoded: 2026-08-12 03:56 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	4Z1RZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 20:11	60m	-8 / -11	OZ1LXL	0 / -11	8	✓ Full exchange observed
09-18 20:11	60m	- / -16	G0ORC	-6 / -	10	Partial capture
09-18 20:10	60m	+8 / -6	G4ZFJ	+2 / -16	7	✓ Full exchange observed
09-18 20:10	60m	-4 / -	TA2EE	- / -22	2	✓ Closing fragment
09-18 20:09	60m	-2 / -	CT7AIU	- / -17	2	✓ Closing fragment
09-16 02:47	60m	- / -	PA3BUD	+4 / -	2	Partial capture
09-16 02:47	60m	-14 / -	KQ4RME	- / -17	2	Partial capture
09-16 02:45	60m	-9 / -	VE3WMI	- / -15	3	✓ Closing fragment
09-16 02:41	60m	-3 / -	K1NY	- / -19	3	✓ Closing fragment
09-16 02:39	60m	-8 / -	N8OQ	- / -20	2	✓ Closing fragment
09-16 02:37	60m	-3 / -3	MI0NWA	-5 / -16	4	Partial capture
09-13 19:46	80m	+2 / -17	DJ7M	+16 / -11	6	✓ Full exchange observed
09-13 19:46	80m	- / -15	OE5ABL	+1 / -	2	Partial capture
09-13 19:46	80m	- / -6	R3KLE	+2 / -	3	✓ Closing fragment
09-13 19:42	60m	+4 / -8	SV8/F2VX	+1 / -5	2	Partial capture
08-29 22:21	40m	+8 / 0	DA1EA	+14 / -9	5	✓ Full exchange observed
08-29 22:21	40m	+20 / -	DL7ACA	+9 / -13	7	✓ Closing observed
08-29 22:20	40m	+19 / -19	K2ZJ	-9 / -17	4	✓ Full exchange observed
08-28 06:05	20m	+6 / -	DL1TJ	- / -11	4	✓ Closing fragment
08-28 05:59	20m	- / -6	IZ8EYN	+18 / -	7	Partial capture
08-15 04:01	20m	-9 / -	K7ZV	- / -15	4	✓ Closing fragment
08-12 04:01	20m	-13 / -	NT5AT	- / -11	2	✓ Closing fragment
08-12 03:59	20m	-10 / -	KJ5QAW	- / -13	2	✓ Closing fragment
08-11 04:47	20m	- / -	EA5XA	+3 / -	5	Partial capture
08-11 04:46	20m	-11 / -	VK1KAZ	- / -	3	✓ Closing fragment
08-11 04:42	20m	- / -8	T77BL	-8 / -	4	✓ Closing fragment
08-09 17:53	20m	- / -	PD1ADA	-17 / -	4	Partial capture
08-09 17:50	20m	-7 / -	YO1BRANCUSI	-6 / -12	2	Partial capture
08-08 04:18	20m	-11 / -	KA2CAT	- / -14	3	Partial capture
08-08 04:14	20m	-8 / -	K0SSD	- / -15	3	✓ Closing fragment
08-08 04:11	20m	-11 / -	KR3Y	- / -16	3	Partial capture
08-04 05:23	20m	-11 / -	ZL4TT	- / -16	2	Partial capture
08-03 04:33	20m	-12 / -	DL9KM	- / -3	3	Partial capture
08-03 04:32	20m	-4 / -	YU7XL	- / -16	2	✓ Closing fragment
08-03 04:29	20m	-7 / -	ZL1GT	- / -10	2	✓ Closing fragment
08-03 04:29	20m	-10 / -	UT1KWA	- / -2	2	✓ Closing fragment
08-03 04:26	20m	0 / -	C91RU	- / -17	3	✓ Closing fragment
07-31 04:13	20m	-2 / -11	WZ8S	-3 / -7	5	✓ Full exchange observed
07-31 04:12	20m	-8 / -	KC9EP	- / -15	2	✓ Closing fragment
07-30 04:28	20m	-6 / -	K4OP	- / -20	2	✓ Closing fragment
07-30 04:23	20m	-13 / -	N0VTY	- / -13	2	✓ Closing fragment
07-30 04:22	20m	-7 / -	W6IWW	- / -19	2	Partial capture
07-29 03:48	20m	-1 / -	WW5TT	- / -19	2	✓ Closing fragment
07-29 03:45	20m	-8 / -	A92AE	- / -16	2	✓ Closing fragment
07-29 03:42	20m	-12 / -	W9TEF	- / -20	2	✓ Closing fragment
07-29 03:41	20m	-7 / -	KJ5LDV	- / -16	2	✓ Closing fragment
07-28 06:19	20m	-17 / -	KK4GEP	- / -10	4	Partial capture
07-28 06:06	20m	-12 / -	KK4GEP	- / -11	4	Partial capture
07-28 05:57	20m	-4 / -	W1CDO	- / -10	4	Partial capture
07-28 05:07	20m	-9 / -	AA3DP	- / -18	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
194530 -17 1243  4Z1RZ EH3ST R+01
194600  -4 2576  4Z1RZ R3KLE KO91 (x2)
194630  +6 1243  4Z1RZ OE5ABL -15
194630 +22  379  4Z1RZ DJ7M JN49
194700  +1 2577  4Z1RZ R3KLE 73
194700 +10  379  4Z1RZ DJ7M JN49
194715  +6  379  DJ7M 4Z1RZ -11
194730  -4 1243  4Z1RZ OE5ABL -15
194730 +16  379  4Z1RZ DJ7M R-17
194745  -3  379  DJ7M 4Z1RZ RR73
194800 +15  379  4Z1RZ DJ7M 73
194830 -14 1958  4Z1RZ IK2LRF JN45
210615 -14 1230  TA4RC 4Z1RZ RR73

60m

UTC    dB Audio  Message
201245  -4 1676  4Z1RZ OZ1LXL JO55
201245  +1  565  4Z1RZ G4ZFJ 73
201245  -5  462  4Z1RZ G0ORC -16
201300 -10 1676  OZ1LXL 4Z1RZ -11
201315  +0 1676  4Z1RZ OZ1LXL R-11
201315  -4  463  4Z1RZ G0ORC -16
201345  +0 2176  4Z1RZ OZ1LXL R-11
201400  -6 2176  OZ1LXL 4Z1RZ RR73
201415  +4 1676  4Z1RZ OZ1LXL 73
201515  -1  908  4Z1RZ SV1DZB KM18
201515 -10  463  4Z1RZ G0ORC -15 (x5)

40m

UTC    dB Audio  Message
222045  -9 2864  4Z1RZ K2ZJ R-19
222100 +21 2865  K2ZJ 4Z1RZ RR73 (x2)
222145 +13 2865  4Z1RZ DL7ACA JO40
222145 +17 2381  4Z1RZ DA1EA JO31
222200  +9 2382  DA1EA 4Z1RZ -09
222215  +4 2865  4Z1RZ DL7ACA JO40
222215 +14 2381  4Z1RZ DA1EA R+00
222230  +8 2381  DA1EA 4Z1RZ RR73
222245  +8 2865  4Z1RZ DL7ACA JO40
222245 +11 2381  4Z1RZ DA1EA 73
222315 +10 2865  4Z1RZ DL7ACA JO40
222330 +17 2866  DL7ACA 4Z1RZ -13 (x2)
222415 +12 2865  4Z1RZ DL7ACA 73

20m

UTC    dB Audio  Message
040100  -6 2009  K7ZV 4Z1RZ -15 (x4)
055915 +14  993  4Z1RZ IZ8EYN -06 (x7)
060500  +7  477  DL1TJ 4Z1RZ -11 (x4)

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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