YH5NA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia Most frequent locator attributed to this token: OJ00

Receiver-side FT8 activity involving YH5NA, decoded by SO8OO in southeastern Poland. 89 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-07-12.

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 89 FT8 messages attributed to YH5NA as the transmitting token by decoded message structure across 1 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 -17 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-17 dB

Estimated median S/N

Bands

20m · 89

First attributed message: 2026-07-12
Last attributed message: 2026-07-12 16:53 UTC

Observed FT8 message patterns

Attributed sample: 89 messages
Active dates: 1 UTC dates
Estimated median S/N: -17 dB
Estimated 10th-90th percentile: -21 to -13 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 63, moderate (-15 to -9 dB) 26, 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 YH5NA in decoded directed-looking exchanges:

IQ4JO · Italy ×2 R2BQM · European Russia ×2 9A5E · Croatia CT7AUT · Portugal DH1FA · Fed. Rep. of Germany DL5OAH · Fed. Rep. of Germany DL5SUA · Fed. Rep. of Germany DL7DO · Fed. Rep. of Germany DL7KI · Fed. Rep. of Germany DL9FCY · Fed. Rep. of Germany EA4GVT · Spain EA5N · Spain

Most frequent locator attributed to YH5NA

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: OJ00 · 26 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 9,195 km (approx.)
Last such locator decoded: 2026-07-12 16:29 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	YH5NA S/N	Counterpart	Counterpart S/N	Msgs	Capture
07-12 21:38	40m	- / -2	UA3AGW	-9 / -	3	✓ Closing fragment
07-12 21:37	40m	- / -14	IK6DLK	-11 / -	3	✓ Closing fragment
07-12 21:35	40m	- / -11	OK1UG	-14 / -	2	✓ Closing fragment
07-12 21:24	40m	- / -	PA1GLD	-15 / -	3	Partial capture
07-12 21:24	40m	- / -12	SP2GJI	-8 / -	4	Partial capture
07-12 21:23	40m	- / -11	DL5DQZ	-8 / -	6	✓ Closing fragment
07-12 21:20	40m	- / -	SM5FQQ	-2 / -	3	Partial capture
07-12 21:19	40m	- / -9	IV3KQE	-18 / -	2	Partial capture
07-12 21:18	40m	- / -16	DH0GBC	-5 / -	12	Partial capture
07-12 21:13	40m	- / -	RN6MA	-15 / -	2	✓ Closing fragment
07-12 21:12	40m	- / -15	R2FDU	-7 / -	3	✓ Closing fragment
07-12 21:06	40m	- / -	S59YL	-12 / -	3	✓ Closing fragment
07-12 21:06	40m	- / -19	SP2JLR	-5 / -	3	✓ Closing fragment
07-12 20:59	40m	- / -16	DH0GBC	-10 / -	2	Partial capture
07-12 20:48	40m	- / -	SP1I	-14 / -	2	Partial capture
07-12 20:47	40m	- / -	UR1HR	-12 / -	2	Partial capture
07-12 20:45	40m	- / -15	PD2TX	-15 / -	5	✓ Closing fragment
07-12 20:44	40m	- / -13	IQ4JO	-9 / -	3	✓ Closing fragment
07-12 20:41	40m	- / -15	TA1BX	-19 / -	2	Partial capture
07-12 20:40	40m	- / -22	ON4ASV	-10 / -	2	✓ Closing fragment
07-12 20:38	40m	- / -	HA1BL	-6 / -	2	Partial capture
07-12 20:31	40m	- / -11	R7BI	-14 / -	3	✓ Closing fragment
07-12 16:56	20m	- / -	DG7DK	-18 / -	5	Partial capture
07-12 16:53	20m	-22 / -12	PD1CW	-12 / -	2	✓ Closing observed
07-12 16:46	20m	- / -8	US5HL	-6 / -	2	Partial capture
07-12 16:39	20m	- / -8	US5HL	-5 / -	2	Partial capture
07-12 16:35	20m	- / -4	US5HL	-14 / -	2	Partial capture
07-12 16:33	20m	-22 / +4	PD4JOH	-16 / -16	5	✓ Full exchange observed
07-12 16:32	20m	-17 / -	YO5OAW	- / -14	2	✓ Closing fragment
07-12 16:24	20m	- / -20	HA7KI	-9 / -	3	Partial capture
07-12 16:23	20m	-17 / -	R9FAK	- / -	2	✓ Closing fragment
07-12 16:22	20m	-20 / -	OK2VCR	- / -10	2	Partial capture
07-12 16:20	20m	-17 / -13	UR3CFC	-4 / -8	3	✓ Full exchange observed
07-12 16:18	20m	-14 / -	IK2SAU	- / -7	2	✓ Closing fragment
07-12 16:14	20m	- / -	EA1IDY	-11 / -	2	Partial capture
07-12 16:13	20m	- / -	R3PE	-10 / -	3	Partial capture
07-12 16:13	20m	-12 / -	I4WQH	- / -13	2	✓ Closing fragment
07-12 16:13	20m	- / -	PD4JOH	-15 / -	4	Partial capture
07-12 16:12	20m	-16 / -	HA7JAZ	- / -8	2	✓ Closing fragment
07-12 16:09	20m	- / -	EA5IT	-8 / -	2	Partial capture
07-12 16:09	20m	-18 / -3	YO8DHD	-10 / -9	6	✓ Full exchange observed
07-12 16:07	20m	-13 / -	OK1JAZ	- / -9	2	✓ Closing fragment
07-12 16:05	20m	-15 / -10	IT9VCE	+2 / -1	5	✓ Full exchange observed
07-12 16:02	20m	-11 / -	EW7DDR	-13 / -14	2	Partial capture
07-12 15:59	40m	- / -12	RA3AJT	-10 / -	2	Partial capture
07-12 15:59	20m	-14 / -	9A5E	- / -11	2	✓ Closing fragment
07-12 15:58	20m	- / -5	MW0DNF	-3 / -	5	Partial capture
07-12 15:57	20m	-16 / -7	UB3KDU	-16 / -6	3	✓ Full exchange observed
07-12 15:57	40m	- / -	HA3YA	-20 / -	2	Partial capture
07-12 15:55	20m	-16 / -	HB9HIM	-18 / -15	4	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
212645  -5 1229  YH5NA SP2GJI R-12 (x2)
213215 -16 2347  YH5NA SV3GKU -15
213315 -23 1711  YH5NA EA3NG -24
213545 -15 1342  YH5NA OK1UG R-11 (x2)
213745 -15 1145  YH5NA IK6DLK JN63 (x2)
213845  -9 1586  YH5NA UA3AGW KO85
213845 -11 1145  YH5NA IK6DLK 73
213945  -8 1586  YH5NA UA3AGW R-02 (x2)
214045 -13  791  YH5NA 9A7BB JN75
214715  -9  501  YH5NA RW6MDU R-12
224945  -8 2618  YH5NA DK2SW JO43

20m

UTC    dB Audio  Message
163915  -5 2419  YH5NA US5HL -08 (x2)
164030 -21 1991  DL7DO YH5NA RR73
164630  -9 2422  YH5NA US5HL -08 (x2)
164815 -20 1992  OK2LC YH5NA RR73
165045 -22 1993  SQ9OKB YH5NA -15
165300 -12 1993  YH5NA PD1CW R-12
165315 -22 1993  PD1CW YH5NA RR73
165430  -3 2544  YH5NA EA1IDY IN51
165600 -20 1994  YH5NA DG7DK JO43 (x5)

80m

UTC    dB Audio  Message
164545  -4 1154  YH5NA UA4FKT R-10 (x2)

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