JH7DFZ — 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: Japan Most frequent locator attributed to this token: QM07

Receiver-side FT8 activity involving JH7DFZ, decoded by SO8OO in southeastern Poland. 15 FT8 messages attributed to this token as transmitter, on 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-19 and 2026-08-30.

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 15 FT8 messages attributed to JH7DFZ as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.

Overview

15
Messages attributed
4
UTC dates decoded
7
Active 15-min windows
-15 dB
Estimated median S/N

Bands

20m · 15
First attributed message: 2026-06-19
Last attributed message: 2026-08-30 21:21 UTC

Observed FT8 message patterns

Attributed sample
15 messages
Active dates
4 UTC dates
Estimated median S/N
-15 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 8, strong (≥ -8 dB) 0.

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 JH7DFZ in decoded directed-looking exchanges:

Most frequent locator attributed to JH7DFZ

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
QM07 · 13 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,616 km (approx.)
Last such locator decoded
2026-08-30 21:19 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 UTCBandJH7DFZ S/NCounterpartCounterpart S/NMsgsCapture
10-10 09:49 10m - / - SQ8DPZ -10 / - 2 Partial capture
08-30 22:12 20m - / -1 EA3NE -2 / - 3 ✓ Closing fragment
08-30 09:29 20m - / -13 UA3SNB +2 / - 2 ✓ Closing fragment
08-29 21:14 40m - / - IW8FCR -10 / - 2 Partial capture
08-28 22:11 20m - / -21 F4JVF +5 / - 3 ✓ Closing fragment
08-28 22:07 20m - / -12 HB9DDS -3 / - 6 ✓ Closing fragment
08-27 20:13 20m - / -15 PA1VC -4 / - 5 ✓ Closing fragment
08-27 20:12 20m - / -10 F5CCX +11 / - 3 ✓ Closing fragment
08-25 13:34 20m -20 / -13 SA3KAK +7 / - 2 ✓ Closing observed
08-24 21:08 20m - / -14 EA4PS -1 / - 9 Partial capture
08-22 21:15 20m - / -19 F4JYC +5 / - 9 ✓ Closing fragment
08-22 21:12 20m - / - F5NNN -7 / - 4 Partial capture
08-22 21:07 20m - / 0 OZ1BW +5 / - 3 ✓ Closing fragment
08-22 20:54 20m - / -17 CT1DTM -3 / - 5 Partial capture
08-22 20:53 20m - / -21 CT1BFP +1 / - 13 ✓ Closing fragment
08-22 20:45 20m - / - IV3FHI +2 / - 4 Partial capture
08-22 20:45 20m - / -19 M8HAG +6 / - 2 ✓ Closing fragment
08-21 21:11 20m - / -12 S52SY -4 / - 2 Partial capture
08-21 21:04 20m - / -12 ON5GQ +7 / - 4 ✓ Closing fragment
08-21 20:56 20m - / -21 DB9LG +5 / - 8 Partial capture
08-21 20:54 20m - / -12 EA5JLB -2 / - 3 ✓ Closing fragment
08-21 20:54 20m - / -16 IZ3SQT -12 / - 2 Partial capture
08-21 20:51 20m - / - CT2KCK -9 / - 3 Partial capture
08-19 21:21 20m - / -8 S56UVB -13 / - 3 ✓ Closing fragment
08-19 21:15 20m - / - I8OHQ -8 / - 5 ✓ Closing fragment
08-19 14:03 20m - / -15 DH9DR -13 / - 2 ✓ Closing fragment
08-17 20:29 20m - / -15 EA3RT -4 / - 2 ✓ Closing fragment
08-16 13:59 20m - / -11 UA3ZAB -10 / - 2 ✓ Closing fragment
08-15 13:03 20m - / -14 SA3GER -6 / - 2 ✓ Closing fragment
08-14 21:13 20m - / -14 DL1R 0 / - 6 ✓ Closing fragment
08-14 21:08 20m - / -15 DL1IP -4 / - 3 ✓ Closing fragment
08-12 20:44 20m - / -10 EA3EDU -6 / - 8 Partial capture
08-12 20:43 20m - / -15 PD0U -10 / - 4 ✓ Closing fragment
08-10 20:35 20m - / -9 ON4AZR -15 / - 3 ✓ Closing fragment
08-10 20:28 20m - / -11 DL1R -5 / - 10 Partial capture
08-10 14:04 20m - / -11 OY5T -20 / - 2 ✓ Closing fragment
08-09 21:13 20m - / -20 EA3GKE/QRP -20 / - 3 Partial capture
08-07 22:02 20m - / -17 GM4SJB -12 / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
083345 -16 1573  JH7DFZ SV9MBL RRR
094945 -10  634  JH7DFZ SQ8DPZ +18 (x2)
20m 
UTC    dB Audio  Message
220930  -9 1017  JH7DFZ HB9DDS R-12 (x3)
221100  +4  800  JH7DFZ F4JVF IN95 (x3)
221300  +8  304  JH7DFZ T77RN RR73
092900  +3 2010  JH7DFZ UA3SNB -13 (x2)
211945 -17 1340  TA3MPK JH7DFZ QM07
212100 -13  980  YO2MD JH7DFZ R-17
220545  -8 2576  JH7DFZ F1PBZ RR73
221245  -3  981  JH7DFZ EA3NE JN11 (x3)
40m 
UTC    dB Audio  Message
211445 -12  881  JH7DFZ IW8FCR JN70 (x3)

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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