JF4VZT — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Locator transmitted in a decoded message: PM64

Receiver-side FT8 activity involving JF4VZT, decoded by SO8OO in southeastern Poland. 225 related FT8 messages, observed on 160m, 80m, 40m, 20m, across 19 UTC dates. Heard between 2026-06-05 and 2026-08-24.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee

Overview

225

Related messages

CQ messages

UTC dates heard

-2 dB

Mean decoder S/N

Bands

80m 20m 40m 160m

First seen: 2026-06-05
Last seen: 2026-08-24 06:36 UTC

Frequent QSO partners observed at SO8OO

Stations JF4VZT worked most often, as logged from our receiver:

EA1B · Spain ×2 5Z4AB · Kenya LA7DMA · Norway OK4SD · Czech Republic IK1JUS · Italy TA9M · Asiatic Turkey EA3ENB · Spain BG4LNW · China RA6YDX · European Russia 7X5CY · Algeria HC2GRC · Ecuador OH2BGD · Finland

Activity Heatmap

Locator transmitted by JF4VZT

Approximate centre of PM64, decoded 2026-08-23 19:57 UTC. A transmitted locator is not proof of the operator's permanent location.

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	JF4VZT S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-24 08:36	20m	- / +7	HC2GRC	-9 / -	2	✓ Closing fragment
08-23 20:00	80m	- / -	YO7ZG	+14 / -	2	Partial capture
08-23 19:59	80m	- / -	LB6BK	-6 / -	2	Partial capture
08-23 19:58	80m	-11 / -11	IK5CHL	+4 / -15	6	✓ Full exchange observed
08-23 19:56	80m	-10 / -	GU4WRP	- / -	3	Partial capture
08-21 20:38	40m	- / +8	OK4SD	+8 / -	4	✓ Closing fragment
08-21 20:34	40m	- / -	EA3ENB	-10 / -	2	✓ Closing fragment
08-21 20:33	40m	- / -14	F1IQH	-8 / -	2	✓ Closing fragment
08-21 20:32	40m	- / -9	IK1JUS	-1 / -	4	✓ Closing fragment
08-21 20:31	40m	- / -19	GM0SDV	-9 / -	10	Partial capture
08-21 20:29	40m	-12 / -1	ON4IQ	+14 / -6	7	✓ Full exchange observed
08-21 20:29	40m	-13 / -5	IN3KXV	+6 / -7	5	✓ Full exchange observed
08-21 20:18	80m	- / -	DL7ACN	-2 / -	2	Partial capture
08-21 20:17	80m	- / -	R6ZEJ	-10 / -	5	Partial capture
08-21 20:15	80m	-6 / -16	RU3T	+1 / -11	7	✓ Full exchange observed
08-21 20:15	80m	-6 / -8	UT7UA	+8 / -15	9	✓ Full exchange observed
08-21 20:14	80m	- / -	OK4SD	-4 / -	4	Partial capture
08-21 20:14	80m	- / -15	UR5KC	+8 / -	2	Partial capture
08-21 20:13	80m	- / -	DL7ACN	-3 / -	5	Partial capture
08-21 20:12	80m	-6 / -	LY1DY	+8 / -16	6	✓ Closing observed
08-21 20:11	80m	-7 / -19	R3VA	-3 / -12	10	✓ Full exchange observed
08-21 20:10	80m	-8 / -6	F8FUA	-9 / -14	9	✓ Full exchange observed
08-20 20:58	40m	-15 / -	SV1TRJ	- / -	3	Partial capture
08-18 20:37	80m	- / -	SP2HNF	+12 / -	5	Partial capture
08-18 20:34	80m	-16 / -8	<...>	-5 / -	2	Partial capture
08-16 18:56	160m	- / -14	RA3DA	+10 / -	3	✓ Closing fragment
08-11 21:05	40m	- / -10	YO7BPC	-7 / -	5	✓ Closing fragment
08-11 21:04	40m	- / -3	R3EDI	-15 / -	2	Partial capture
08-06 20:55	40m	- / -15	SM7DXE	-14 / -	5	Partial capture
08-06 20:54	40m	- / -3	YO3GCL	-6 / -	4	✓ Closing fragment
08-06 20:42	40m	- / -1	OH2BGD	-9 / -	4	✓ Closing fragment
08-06 20:18	80m	-18 / +3	Z62NS	+7 / -15	3	✓ Full exchange observed
08-02 19:46	80m	- / -6	A71QQ	-2 / -	2	✓ Closing fragment
07-17 19:46	40m	-7 / -	8S7DL	- / -21	5	✓ Closing fragment
07-16 20:51	20m	-2 / -	IU5TSN	- / -20	2	Partial capture
07-16 20:45	20m	-3 / -	DC3AK	- / -13	7	Partial capture
07-16 20:42	20m	-13 / -3	DH1JG	-16 / -12	4	✓ Full exchange observed
07-16 20:40	20m	-14 / -	LA7DMA	- / -24	2	✓ Closing fragment
07-10 20:04	80m	- / -15	UA6AAW	-9 / -	2	Partial capture
07-10 20:02	80m	- / -	IW7DVM	-4 / -	3	Partial capture
07-10 20:01	80m	- / -16	OE8TED	+2 / -	3	✓ Closing fragment
07-10 20:01	80m	- / -11	R6CW	-18 / -	2	Partial capture
07-10 20:00	80m	- / -15	R3BDQ	-6 / -	2	✓ Closing fragment
07-10 19:58	80m	- / -15	RO2X	+1 / -	3	Partial capture
07-08 19:36	40m	- / -11	PA2KW	-4 / -	12	✓ Closing fragment
07-08 19:36	40m	- / -19	PD7YY	-10 / -	4	Partial capture
07-08 19:35	40m	- / -5	IV3GVS	-2 / -	3	Partial capture
06-30 20:18	20m	+4 / -	SA5HAG	- / -	4	Partial capture
06-27 19:23	80m	-12 / -10	YO4NT	+8 / -	3	✓ Closing observed
06-25 20:55	20m	-4 / -	BG4LNW	- / -14	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
204300 -14 1427  JF4VZT DH1JG R-03
204315 -13 1427  DH1JG JF4VZT RR73
204330 -19 1427  JF4VZT DH1JG 73
204445  -4  454  BI2QMT JF4VZT -03
204545  +1  454  DC3AK JF4VZT -13 (x7)
205115  -2 2987  IU5TSN JF4VZT R-20 (x2)
083615  -9  369  JF4VZT HC2GRC +07 (x2)

80m

UTC    dB Audio  Message
195615 -12  227  GU4WRP JF4VZT PM64 (x3)
195800  +4 2304  JF4VZT IK5CHL JN53
195815 -10  227  IK5CHL JF4VZT -15
195830  +3 2304  JF4VZT IK5CHL R-11
195845 -10  227  IK5CHL JF4VZT RR73
195900  -7 1236  JF4VZT LB6BK JO59
195900  +4 2304  JF4VZT IK5CHL 73
195900  +3  228  JF4VZT OZ2JUM JO46
195915 -14  227  IK5CHL JF4VZT RR73
195930  -4 1237  JF4VZT LB6BK JO59
200000 +12  372  JF4VZT YO7ZG KN14
200000 +15  228  JF4VZT OM7TJ JN98
200030 +16  372  JF4VZT YO7ZG KN14

40m

UTC    dB Audio  Message
203300  -1 1473  JF4VZT IK1JUS 73
203315  -6 1211  JF4VZT F1IQH -14
203330  -7  996  JF4VZT GM0SDV -19
203330  -3 1473  JF4VZT IK1JUS JN35
203400  -8  996  JF4VZT GM0SDV -19
203415  -9 1211  JF4VZT F1IQH RR73
203430 -10  996  JF4VZT GM0SDV -19
203445 -13  997  JF4VZT EA3ENB JN11
203500  -5  996  JF4VZT GM0SDV -19
203545  -8  997  JF4VZT EA3ENB 73
203700 -10  996  JF4VZT GM0SDV -19
203815 +12 3038  JF4VZT OK4SD JN79 (x4)

160m

UTC    dB Audio  Message
185230  +4 2022  JF4VZT RA3DA KO95
185245 -10 1205  JF4VZT OM2WQ JN88 (x4)
185600  +7 2114  JF4VZT RA3DA KO95 (x3)

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.