4Z4DA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Israel Most frequent locator attributed to this token: KM73

Receiver-side FT8 activity involving 4Z4DA, decoded by SO8OO in southeastern Poland. 266 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 12 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-09-13.

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 266 FT8 messages attributed to 4Z4DA as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (67%), followed by 40 m (33%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.

Overview

266
Messages attributed
12
UTC dates decoded
31
Active 15-min windows
-8 dB
Estimated median S/N

Bands

40m · 88 20m · 178
First attributed message: 2026-06-10
Last attributed message: 2026-09-13 17:04 UTC

Observed FT8 message patterns

Attributed sample
266 messages
Active dates
12 UTC dates
Estimated median S/N
-8 dB
Estimated 10th-90th percentile
-16 to +7 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 34, moderate (-15 to -9 dB) 87, strong (≥ -8 dB) 145.

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 4Z4DA 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 4Z4DA

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
KM73 · 83 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
2,124 km (approx.)
Last such locator decoded
2026-09-13 17:04 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 UTCBand4Z4DA S/NCounterpartCounterpart S/NMsgsCapture
09-17 16:54 80m - / - LZ2XF +9 / - 5 Partial capture
09-13 16:59 40m -6 / - G7EVY - / -22 2 Partial capture
09-13 16:55 40m -4 / -11 RX9WM -14 / -4 4 Partial capture
09-13 16:51 40m -6 / +6 F4PCM -16 / -8 4 ✓ Full exchange observed
09-13 16:51 40m -7 / - DL1MST -7 / -18 4 Partial capture
09-13 16:48 40m - / -11 RA3RSO -6 / - 4 ✓ Closing fragment
09-13 16:48 40m -8 / - EA4GG - / -17 3 Partial capture
09-13 16:46 40m -7 / +1 UR4CU -8 / -6 5 ✓ Full exchange observed
09-13 16:42 40m -4 / - R6LPF - / -9 2 Partial capture
09-13 16:42 40m -6 / -5 PE1OID -7 / -20 5 Partial capture
09-13 16:39 40m -6 / +2 OE3DJL +13 / -3 5 ✓ Full exchange observed
09-13 16:35 40m - / - UB6OFG +5 / - 2 Partial capture
09-13 16:34 40m -7 / -12 R1CF -6 / -12 8 ✓ Full exchange observed
09-01 16:53 40m - / -7 YT1DDL -5 / - 4 ✓ Closing fragment
09-01 16:50 40m - / - RZ4FWA -16 / - 2 Partial capture
08-29 16:49 40m -4 / -17 PD0PMF -6 / -21 4 Partial capture
08-29 16:47 40m -8 / -7 SV1EQU -4 / +7 3 Partial capture
08-21 18:03 20m +4 / - RL2F - / -6 2 Partial capture
08-21 17:57 20m +6 / - PA3BMB -3 / +4 7 ✓ Full exchange observed
08-21 17:56 20m +6 / - SP7NC - / +6 2 Partial capture
08-21 17:55 20m - / - DG9SEH -6 / - 2 Partial capture
08-21 17:52 20m +14 / - DL4RY -24 / -25 5 ✓ Closing observed
08-21 17:50 20m +7 / - LB8OH - / -8 2 Partial capture
08-21 17:46 20m +12 / - JA6CNL - / -17 4 ✓ Closing fragment
08-21 17:45 20m +16 / - UT8IFE - / -5 2 Partial capture
08-21 17:44 20m - / - 9A60CBM -7 / - 4 Partial capture
08-21 17:43 20m +14 / - DH2RL +8 / -10 3 ✓ Closing observed
08-21 17:42 20m - / - YT1DDL -10 / - 2 Partial capture
08-21 17:33 40m -6 / - YC6ANA - / -14 2 Partial capture
08-21 17:32 40m - / -11 R3XBB -2 / - 5 ✓ Closing fragment
08-21 17:32 40m -4 / +1 IK2YYO -13 / -12 5 ✓ Full exchange observed
08-21 16:47 40m -12 / -5 F4CZV -6 / - 2 Partial capture
08-21 16:44 40m -11 / - EA7ATM - / -24 3 ✓ Closing fragment
08-21 16:41 40m -11 / -9 UR4LG -14 / -16 4 ✓ Full exchange observed
08-21 16:37 40m -13 / - F4NGR -17 / -16 4 ✓ Closing observed
08-21 16:35 40m -10 / -7 UB4FGK -8 / -14 5 ✓ Full exchange observed
08-21 16:33 40m -14 / - RW9WJ -15 / - 2 Partial capture
08-21 16:31 40m -10 / -10 RA4ABH -9 / -11 8 ✓ Full exchange observed
08-21 16:27 40m -12 / -15 UR5XEJ -2 / -16 6 Partial capture
08-21 16:27 40m -12 / - YT1DDL -13 / -18 3 Partial capture
08-20 18:35 40m - / - OV5SP -21 / - 3 Partial capture
08-20 18:24 20m +8 / - SM7OYP -2 / - 5 ✓ Closing observed
08-20 18:17 20m -4 / -6 G0RVY +6 / +4 8 ✓ Full exchange observed
08-20 18:16 20m - / - SM7OYP +1 / - 2 Partial capture
08-20 18:15 20m +3 / - OH3MB - / - 2 Partial capture
08-20 18:14 20m +4 / - UT7UJ - / -14 2 Partial capture
08-20 18:12 20m +4 / - IZ4AIF +6 / - 5 ✓ Full exchange observed
08-20 18:09 20m +6 / - TA2ED -2 / +10 6 ✓ Closing observed
08-20 18:08 20m +12 / +10 F4ACR +9 / 0 5 ✓ Full exchange observed
08-20 18:06 20m +4 / 0 UT1EF +1 / +2 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
165415 +19 2762  4Z4DA LZ2XF KN33 (x5)
40m 
UTC    dB Audio  Message
165230 -16 2156  4Z4DA F4PCM 73
165230 -13  917  4Z4DA DL1MST JO30
165315  -7 2157  DL1MST 4Z4DA -18
165445  -6 2157  CQ 4Z4DA KM73 (x2)
165545  -1 2157  RX9WM 4Z4DA -04
165600 -14 2162  4Z4DA RX9WM R-11
165615  -6 2157  RX9WM 4Z4DA RRR (x2)
165715  -3 2157  CQ 4Z4DA KM73
165730 -15 2156  4Z4DA OR1A JO21
165845  -8 2157  EX0MAA 4Z4DA 73
165945  -8 2157  G7EVY 4Z4DA -22 (x2)
170445  -5 2157  CQ 4Z4DA KM73                         a1
20m 
UTC    dB Audio  Message
175515  -7 2117  4Z4DA DG9SEH JN48
175530  +3 2029  CQ 4Z4DA KM73
175545  -4 2117  4Z4DA DG9SEH JN48
175600  +5 2029  SP7NC 4Z4DA +06 (x2)
175700  +3 2029  CQ 4Z4DA KM73
175715  -2 2029  4Z4DA PA3BMB JO22
175730  +1 2029  PA3BMB 4Z4DA +04
175745  -4 2029  4Z4DA PA3BMB R+11
175800  +2 2029  PA3BMB 4Z4DA +04 (x2)
175915  -4 2176  4Z4DA PA3BMB 73
175930 +12 2029  PA3BMB 4Z4DA RRR
180300  +3 2029  RL2F 4Z4DA KM73 (x2)
10m 
UTC    dB Audio  Message
162700 -14 1892  4Z4DA F4FSY -04 (x2)
163400 -11 2096  4Z4DA G0ANS -14 (x2)

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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