F4JJM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: IN94

Receiver-side FT8 activity involving F4JJM, decoded by SO8OO in southeastern Poland. 71 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-07-11 and 2026-08-25.

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 71 FT8 messages attributed to F4JJM as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (49%), followed by 40 m (25%) and 20 m (25%). Several six-hour UTC windows tied for the largest share (93%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (66%); the estimated median was -17 dB.

Overview

71
Messages attributed
10
UTC dates decoded
18
Active 15-min windows
-17 dB
Estimated median S/N

Bands

80m · 35 40m · 18 20m · 18
First attributed message: 2026-07-11
Last attributed message: 2026-08-25 03:40 UTC

Observed FT8 message patterns

Attributed sample
71 messages
Active dates
10 UTC dates
Estimated median S/N
-17 dB
Estimated 10th-90th percentile
-21 to -12 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 47, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 1.

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 F4JJM in decoded directed-looking exchanges:

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 F4JJM

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
IN94 · 31 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,816 km (approx.)
Last such locator decoded
2026-08-25 03:40 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 UTCBandF4JJM S/NCounterpartCounterpart S/NMsgsCapture
08-25 03:26 40m - / -24 TA3NK -10 / - 2 ✓ Closing fragment
08-25 03:21 40m - / - F4BYA -3 / - 4 Partial capture
08-25 03:17 40m - / - F4BYA +6 / - 3 Partial capture
08-25 03:17 40m -18 / - KF9UG -14 / -8 4 ✓ Closing observed
08-24 04:24 40m -18 / -18 DL6RS +5 / +6 10 ✓ Full exchange observed
08-24 04:23 40m -19 / -12 DC9GT -14 / -17 9 ✓ Full exchange observed
08-24 04:19 40m -19 / - N4MMR -10 / - 2 ✓ Closing observed
08-21 04:51 80m - / - DL7FE -14 / - 2 Partial capture
08-21 04:45 80m - / -8 DL7FE -18 / - 2 Partial capture
08-18 05:09 80m - / -14 DJ2PW -20 / - 2 ✓ Closing fragment
08-16 04:45 80m - / -10 DJ2PW -16 / - 2 ✓ Closing fragment
08-16 04:35 80m -20 / -6 PA3BUD -14 / +1 4 ✓ Full exchange observed
08-16 04:28 80m - / - SP2BBQ -1 / - 2 Partial capture
08-16 04:27 80m -20 / -19 DA6TT -7 / +1 4 ✓ Closing observed
08-16 04:24 80m -23 / +1 F1PBZ -5 / - 3 ✓ Closing observed
08-13 03:49 80m -14 / +7 IK2TPX -6 / +5 7 Partial capture
08-13 03:46 80m -15 / -14 G8OO +1 / - 6 ✓ Full exchange observed
08-13 03:45 80m -10 / -6 OK1CI +16 / - 8 ✓ Full exchange observed
08-13 03:44 80m -13 / - OE5DML +12 / -6 5 ✓ Closing observed
08-13 03:41 80m -22 / +3 DO3MY -22 / -15 7 ✓ Full exchange observed
08-12 17:42 20m - / -10 PA8S -4 / - 4 ✓ Closing fragment
08-12 15:57 10m - / - DF7EE -6 / - 5 Partial capture
08-06 05:32 20m -8 / - C91RU - / - 2 Partial capture
08-06 05:04 80m - / -13 DL1UDO -13 / - 2 ✓ Closing fragment
08-06 04:49 80m - / -12 Z62NS 0 / - 3 ✓ Closing fragment
08-06 04:47 80m - / +1 F1PBZ -12 / - 2 Partial capture
08-05 16:28 20m -17 / - PD9JPV - / -19 3 Partial capture
08-01 06:16 20m - / -2 F1PBZ +13 / - 2 Partial capture
08-01 06:15 20m -17 / -11 RX3ASQ -13 / - 4 ✓ Closing observed
08-01 06:10 20m -14 / - R5AV - / +5 3 Partial capture
07-19 20:10 80m - / -16 ON3GTV -9 / - 3 Partial capture
07-19 05:37 40m - / - OE5ROR -15 / - 7 Partial capture
07-18 16:23 20m - / -9 IU5HIU -9 / - 2 Partial capture
07-18 04:57 40m - / -1 DJ0MAB -18 / - 5 ✓ Closing fragment
07-15 03:59 80m -19 / -5 DK1MCS -2 / -3 8 ✓ Full exchange observed
07-15 03:52 80m - / - DL1UDO -4 / - 4 Partial capture
07-15 03:49 80m -16 / -5 DO1IJB +5 / +10 5 ✓ Full exchange observed
07-14 09:36 10m - / -2 F1PBZ +5 / - 2 Partial capture
07-13 06:42 20m - / -17 DK3TNA -10 / - 5 Partial capture
07-12 06:03 40m - / - SQ3PMX -13 / - 3 Partial capture
07-11 08:02 20m - / -13 E70SZ -9 / - 4 ✓ Closing fragment
07-11 07:54 20m - / -24 PD3LKN -14 / - 2 Partial capture
07-11 05:08 20m -19 / - YO6POG - / +10 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
031800  +7 2887  F4JJM F4BYA JN19 (x2)
031845 -17 1150  KF9UG F4JJM R-08
031900 -14  913  F4JJM KF9UG RR73
031915 -19 1150  KF9UG F4JJM RR73
032100  -2 2887  F4JJM F4BYA JN19
032100  -3 1149  F4JJM DM2AB JN49
032130  -2 2886  F4JJM F4BYA JN19 (x3)
032315 -21 1150  WA4TED F4JJM -19
032630  -9 1151  F4JJM TA3NK R-24 (x2)
034015 -15 1151  CQ F4JJM IN94
034045 -12 1151  R6LE F4JJM -02
80m 
UTC    dB Audio  Message
042830  +1 2305  F4JJM SP2BBQ JO84 (x2)
043530 -18 1206  F4JJM PA3BUD -06
043545 -20 1204  PA3BUD F4JJM +01
043600  -9 1206  F4JJM PA3BUD R-05 (x2)
044500 -16 1205  F4JJM DJ2PW R-10 (x2)
045330 -21  426  F4JJM DO8JB JO32
050930 -20 1340  F4JJM DJ2PW R-14 (x2)
044500 -13  969  F4JJM DL7FE JN49 (x4)
20m 
UTC    dB Audio  Message
061630 +13 2671  F4JJM F1PBZ -02
061700 -15 1316  F4JJM RX3ASQ RR73
062045 -16 1052  CQ F4JJM IN94
062230  -9 1052  KQ4MHD F4JJM IN94
062300 -17 1325  F4JJM PD2WL JO22
062700 -14 1051  F4JJM EA3GXK RR73
162845 -17 1026  PD9JPV F4JJM IN94 (x3)
053245  -9 1088  C91RU F4JJM IN94 (x2)
174200  -5  672  F4JJM PA8S JO32 (x4)
10m 
UTC    dB Audio  Message
093600  +5 2636  F4JJM F1PBZ -02 (x2)
155330 -15 1512  F4JJM EA5UI IM98
155930  -6 2699  F4JJM IQ4JO JN63
155730  -6 1440  F4JJM DF7EE JO40 (x5)

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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