JH4VTV — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan

Receiver-side FT8 activity involving JH4VTV, decoded by SO8OO in southeastern Poland. 2 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-06-19.

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 2 FT8 messages attributed to JH4VTV as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The available sample contains attributed decodes on 20 m (100%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.

Overview

2
Messages attributed
2
UTC dates decoded
2
Active 15-min windows
-
S/N pattern not inferred

Bands

20m · 2
First attributed message: 2026-06-06
Last attributed message: 2026-06-19 18:40 UTC

Observed FT8 message patterns

Attributed sample
2 messages
Active dates
2 UTC dates
S/N summary
Too few decodes
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JH4VTV in decoded directed-looking exchanges:

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 UTCBandJH4VTV S/NCounterpartCounterpart S/NMsgsCapture
08-29 15:38 20m - / - EA3EDU -1 / - 7 Partial capture
08-28 11:41 10m - / - HB9EFK -6 / - 20 Partial capture
08-26 19:09 20m - / - DH2RL -2 / - 5 Partial capture
08-26 19:03 20m - / - SN4K -6 / - 4 Partial capture
08-26 18:30 20m - / - R9FFZ -18 / - 3 Partial capture
08-26 18:10 20m - / - PD1RHK +7 / - 5 Partial capture
08-26 18:08 20m - / - PD3ED +6 / - 3 Partial capture
08-26 18:05 20m - / -16 PE1MHY +1 / - 5 Partial capture
08-24 18:36 20m - / -17 ON4IQ +14 / - 4 ✓ Closing fragment
08-24 18:33 20m - / - ON4IQ +20 / - 2 Partial capture
08-24 18:11 20m - / - ON4IQ +14 / - 2 Partial capture
08-24 18:09 20m - / - UR5KC -8 / - 4 Partial capture
08-24 18:02 20m - / -11 F4ILK +4 / - 2 ✓ Closing fragment
08-24 17:59 20m - / - ON4IQ +19 / - 10 Partial capture
08-22 21:05 20m - / -22 BG7BVI -12 / - 2 ✓ Closing fragment
08-21 19:19 20m - / -20 DL2RH +3 / - 3 Partial capture
08-21 19:18 20m - / - DL1R +6 / - 6 Partial capture
08-21 19:18 20m - / - IZ6BRN +19 / - 2 Partial capture
08-21 19:03 20m - / -18 DH2RL +2 / - 6 Partial capture
08-20 20:02 20m - / -18 F4JUQ +15 / - 8 Partial capture
08-17 18:39 20m - / -20 PD2FS -5 / - 3 Partial capture
08-17 18:38 20m - / - ON4IQ +12 / - 2 Partial capture
08-17 18:25 20m - / - ON4IQ -1 / - 3 Partial capture
08-17 18:07 20m - / -18 ON4AOI -9 / - 7 ✓ Closing fragment
08-17 18:05 20m - / - ON4IQ +9 / - 7 Partial capture
08-17 18:02 20m - / -17 ON4AOI -4 / - 4 Partial capture
08-17 18:02 20m - / - ON4IQ +10 / - 2 Partial capture
08-17 18:00 20m - / -17 DG1ASD -18 / - 3 ✓ Closing fragment
08-17 18:00 20m - / -14 DG5PW -21 / - 2 ✓ Closing fragment
08-17 17:51 20m - / - OZ2LP -22 / - 2 ✓ Closing fragment
08-16 21:00 20m - / -12 F4GRW -17 / - 2 ✓ Closing fragment
08-16 18:02 20m - / - EA1B +1 / - 3 Partial capture
08-16 18:01 20m - / - EA3CUU 0 / - 2 Partial capture
08-16 18:01 20m - / - R4ADD -4 / - 3 Partial capture
08-07 18:59 20m - / - F4LNQ -10 / - 2 Partial capture
08-07 18:49 20m - / - CR7BRV -2 / - 2 Partial capture
08-07 18:41 20m - / - 4L7T +3 / - 3 Partial capture
08-07 17:38 20m - / - G3AML -13 / - 3 Partial capture
08-07 17:28 20m - / - DG1KDD +3 / - 3 Partial capture
08-06 18:48 20m - / - EA1B +1 / - 4 Partial capture
08-03 21:48 20m - / -21 IK1NEG -14 / - 2 ✓ Closing fragment
08-03 17:52 20m - / -22 E77WA -14 / - 6 Partial capture
08-03 17:46 20m - / - DL9OE -22 / - 2 Partial capture
08-03 17:39 20m - / - DG5PW -19 / - 3 ✓ Closing fragment
08-03 17:36 20m - / - IU2CAT +1 / - 7 Partial capture
08-03 17:26 20m - / -9 DF0KK +4 / - 6 Partial capture
08-03 17:26 20m - / - EW1MN +2 / - 3 Partial capture
08-03 17:23 20m - / -19 DH1FA -11 / - 2 ✓ Closing fragment
08-03 16:39 20m - / -10 EA4T -11 / - 2 Partial capture
07-30 20:28 20m - / -17 IZ2EID -10 / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
190345  -8 1382  JH4VTV SN4K KO03 (x3)
190945  +0 1370  JH4VTV DH2RL JN68 (x5)
153845  -3 1538  JH4VTV EA3EDU JN01 (x7)
10m 
UTC    dB Audio  Message
114515  -3  325  JH4VTV HB9EFK JN46 (x15)

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