YB8CMT — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia Most frequent locator attributed to this token: OI94

Receiver-side FT8 activity involving YB8CMT, decoded by SO8OO in southeastern Poland. 18 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-28 and 2026-08-29.

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 18 FT8 messages attributed to YB8CMT as the transmitting token by decoded message structure across 2 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 -18 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-18 dB

Estimated median S/N

Bands

20m · 18

First attributed message: 2026-08-28
Last attributed message: 2026-08-29 16:18 UTC

Observed FT8 message patterns

Attributed sample: 18 messages
Active dates: 2 UTC dates
Estimated median S/N: -18 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 18, moderate (-15 to -9 dB) 0, 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 YB8CMT in decoded directed-looking exchanges:

AK6MH · United States F4GHN · France F5RRS · France JG2CNZ · Japan NO4J · United States OH3OJ · Finland ON5UN · Belgium ON8BB · Belgium R0AH · Asiatic Russia R3NBI · European Russia RU3GC · European Russia RU9CZ · Asiatic Russia

Most frequent locator attributed to YB8CMT

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: OI94 · 8 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 10,991 km (approx.)
Last such locator decoded: 2026-08-29 16:13 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 UTC	Band	YB8CMT S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-30 16:49	20m	- / -6	F4GHN	+18 / -	2	✓ Closing fragment
08-30 16:45	20m	- / -16	ON5GQ	+2 / -	3	Partial capture
08-30 16:35	20m	- / -15	ON8BB	-8 / -	3	✓ Closing fragment
08-29 16:14	20m	- / -	F4ACR	-9 / -	2	Partial capture
08-28 15:30	40m	- / -16	PD2AE	-22 / -	2	Partial capture
08-28 15:29	20m	-16 / -6	RU3GC	-10 / -9	5	✓ Full exchange observed
08-28 15:26	20m	-18 / -	JG2CNZ	- / -18	2	✓ Closing fragment
08-28 15:20	20m	-16 / -19	R2DN	-10 / -13	2	Partial capture
08-28 15:15	20m	- / -13	R3NBI	+4 / -	2	✓ Closing fragment
08-28 15:10	20m	-22 / -	OH3OJ	- / -19	2	✓ Closing fragment
08-28 12:37	20m	- / -12	RU9CZ	+3 / -	5	✓ Closing fragment
08-27 11:24	20m	- / -18	R8CIS	-13 / -	3	Partial capture
08-26 14:45	10m	- / -	CT3IQ	-17 / -	2	Partial capture
08-26 14:00	10m	- / -9	IT9ZIR	-20 / -	3	Partial capture
07-25 22:31	20m	- / -14	ON5UN	-14 / -	2	✓ Closing fragment
07-24 18:07	20m	- / -14	F5RRS	-9 / -	3	✓ Closing fragment
07-24 17:59	20m	- / -13	EA8UP	-5 / -	4	Partial capture
07-14 15:40	40m	- / -15	R5DT	-10 / -	2	✓ Closing fragment
07-12 15:57	40m	- / -	UW5ZM	-4 / -	2	Partial capture
07-11 12:46	20m	- / -	RZ4FWA	-19 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
234100  -2 1048  YB8CMT DL3MIB -16
161330 -18 1320  CQ YB8CMT OI94
161415  -7 1320  YB8CMT F4ACR IN96 (x2)
161815 -21 1325  KA5WSS YB8CMT R-19
162615  +6  771  YB8CMT F1DJY -14
162500 -11 2482  YB8CMT SP9KDA -15
163545  -9 1840  YB8CMT ON8BB JO21 (x3)
164545  +1 2127  YB8CMT ON5GQ -16 (x3)
164945 +17 2424  YB8CMT F4GHN -06 (x2)

40m

UTC    dB Audio  Message
163530 -11 1261  YB8CMT R7CD RR73
155745  -3  535  YB8CMT UW5ZM KN57 (x2)
154030 -12 1421  YB8CMT R5DT -15 (x2)
153045 -21 1513  YB8CMT PD2AE -16 (x2)

10m

UTC    dB Audio  Message
140015 -19 1461  YB8CMT IT9ZIR -09 (x3)
144515 -18 1543  YB8CMT CT3IQ IM12 (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.

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