IS0YHV — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sardinia Most frequent locator attributed to this token: JM49

Receiver-side FT8 activity involving IS0YHV, decoded by SO8OO in southeastern Poland. 1,020 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 29 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-09.

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 1,020 FT8 messages attributed to IS0YHV as the transmitting token by decoded message structure across 29 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (97%), followed by 10 m (2%) and 40 m (1%). Most decodes (82%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

1,020

Messages attributed

UTC dates decoded

127

Active 15-min windows

-10 dB

Estimated median S/N

Bands

80m · 1 40m · 7 20m · 993 10m · 19

First attributed message: 2026-06-08
Last attributed message: 2026-09-09 19:46 UTC

Observed FT8 message patterns

Attributed sample: 1,020 messages
Active dates: 29 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -19.3 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 224, moderate (-15 to -9 dB) 379, strong (≥ -8 dB) 417.

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 IS0YHV in decoded directed-looking exchanges:

ON3AVT · Belgium ×2 CT1BFP · Portugal M7NNB · England PD7BDN · Netherlands PC2KP · Netherlands DK9DA · Fed. Rep. of Germany BA8BLK · China TA3NK · Asiatic Turkey TA1GO · European Turkey TA5FW · Asiatic Turkey HB9CIE · Switzerland LB7ZG · Norway

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 IS0YHV

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: JM49 · 672 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,535 km (approx.)
Last such locator decoded: 2026-09-09 19:45 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	IS0YHV S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-09 20:03	40m	- / +6	DC7MA	-5 / -	3	✓ Closing fragment
09-09 20:00	40m	- / +4	OE8PIT	-7 / -	4	✓ Closing fragment
09-09 19:55	40m	- / -20	UR4QWW	-8 / -	2	✓ Closing fragment
09-09 19:48	40m	- / -	PD2MAC	-10 / -	6	Partial capture
09-09 19:46	40m	- / -	RA6OY	+8 / -	6	Partial capture
09-09 19:45	40m	-16 / -12	PD0ZAP	-16 / -	4	✓ Closing observed
09-09 19:43	40m	- / -2	DF7NO	-2 / -	2	Partial capture
09-03 20:14	40m	- / -	IU3QYU	-1 / -	7	Partial capture
09-03 20:14	40m	- / -15	F1PBZ	-2 / -	4	Partial capture
09-03 20:06	40m	- / -	IZ1OLC	-19 / -	3	✓ Closing fragment
09-03 19:52	40m	- / -3	IU3WOH	+3 / -	3	✓ Closing fragment
09-03 19:51	40m	- / -	DL4AMJ	0 / -	3	Partial capture
09-03 19:46	40m	- / -	DL4AMJ	-4 / -	2	Partial capture
09-03 19:44	40m	- / -	LA1KUA	+5 / -	2	Partial capture
09-03 19:41	40m	- / -11	DF8RU	+9 / -	5	Partial capture
09-03 19:41	40m	- / -	LA1KUA	+7 / -	2	Partial capture
08-31 19:59	20m	- / -	TA2ETI	-15 / -	3	Partial capture
08-31 19:43	20m	-8 / -6	IS0KZK	-5 / -11	7	✓ Full exchange observed
08-31 19:41	20m	-6 / -	TA2ED	- / -3	2	✓ Closing fragment
08-31 19:39	20m	-7 / -	SP9OZ	- / -8	2	✓ Closing fragment
08-31 19:30	20m	-6 / -	VE3NVK	-22 / -17	11	Partial capture
08-31 14:44	20m	- / -	F8EFJ	+2 / -	2	Partial capture
08-31 14:13	20m	- / -	G1LVW	-12 / -	7	Partial capture
08-31 14:04	20m	- / +1	M9TMC	-11 / -	4	Partial capture
08-31 13:53	20m	-10 / -	DM2AB	-1 / -13	5	✓ Closing observed
08-31 13:53	20m	- / -11	SV1TAJ	-11 / -	2	✓ Closing fragment
08-31 13:48	20m	-6 / -13	M7MOK	-6 / -14	5	✓ Full exchange observed
08-30 09:35	20m	-2 / -	SG3A	- / -16	2	Partial capture
08-30 09:25	20m	-5 / -17	R7OV	+9 / -12	7	Partial capture
08-30 08:50	20m	-2 / -	R7OV	- / -12	4	Partial capture
08-30 08:41	20m	-12 / -	R7OV	- / -12	3	Partial capture
08-30 08:36	20m	-12 / -14	R6OIW	+10 / -13	5	✓ Full exchange observed
08-28 20:24	20m	-8 / -	KQ4IVE	- / -14	5	Partial capture
08-28 20:22	20m	- / -4	G4YOH	+7 / -	3	✓ Closing fragment
08-28 20:19	20m	- / -	G4YOH	0 / -	2	Partial capture
08-28 20:16	20m	-16 / -	EI5JHB	-15 / -	2	✓ Closing observed
08-27 20:34	20m	-9 / -12	K2TQC	-10 / -	4	✓ Closing observed
08-27 20:12	20m	- / -	W3FR	-12 / -	9	Partial capture
08-27 20:11	20m	- / +7	F4MSA	-1 / -	2	Partial capture
08-27 20:11	20m	-8 / -22	ON3AVT	+8 / -8	16	✓ Full exchange observed
08-27 20:09	20m	-2 / -	TA2IM	- / -14	2	✓ Closing fragment
08-27 20:01	20m	- / -	G3YCH	-6 / -	2	Partial capture
08-27 19:55	20m	- / -	ON3AVT	+8 / -	10	Partial capture
08-27 14:26	20m	-3 / -	W2RES	- / -18	3	✓ Closing fragment
08-27 14:24	20m	-2 / -7	TA3NK	-12 / -11	4	✓ Full exchange observed
08-26 20:11	20m	- / -13	DG5PW	-5 / -	4	✓ Closing fragment
08-26 20:07	20m	- / -	RZ4FWA	-10 / -	4	Partial capture
08-25 19:56	20m	-2 / -	TA1GO	- / -12	2	✓ Closing fragment
08-25 19:54	20m	- / -13	G8WIL	+11 / -	3	✓ Closing fragment
08-24 20:46	40m	- / -	M0THH	-14 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
194845 +12  242  IS0YHV RA6OY KN88
194915  -8  362  IS0YHV PD2MAC JO22 (x4)
195515  -7 1575  IS0YHV UR4QWW R-20 (x2)
200015  -5 1244  IS0YHV OE8PIT JN66 (x2)
200115  -3  362  IS0YHV PD2MAC JO22
200115 -12 1244  IS0YHV OE8PIT 73 (x2)
200345  -6 1938  IS0YHV DC7MA JN39 (x3)

20m

UTC    dB Audio  Message
194500 -11  831  IS0KZK IS0YHV RR73
194515  -3  831  IS0YHV IS0KZK 73
195700 -18  831  CQ IS0YHV JM49 (x3)
195915 -13  830  IS0YHV TA2ETI KM77
195930  -5  830  CQ IS0YHV JM49
195945 -18  829  IS0YHV TA2ETI KM77
200000  -1  830  CQ IS0YHV JM49
200015 -15  829  IS0YHV TA2ETI KM77
200030  -7  831  CQ IS0YHV JM49
200100  -8  830  OM2IDN IS0YHV -15
200200  -5  831  CQ IS0YHV JM49 (x3)

80m

UTC    dB Audio  Message
195245  -8  670  CQ IS0YHV JM49

10m

UTC    dB Audio  Message
085745 -18 1420  IS0YHV DA6KK JO30
085745  -8 2740  IS0YHV F1PBZ -16 (x2)
085945 -21 1292  IS0YHV DN9SGE JO42
090300 -13 1520  CQ IS0YHV JM49 (x3)
090930 -16 1521  DL1NDN IS0YHV -09
091100 -22 1520  CQ IS0YHV JM49 (x4)
093100 -12 1520  F4FSY IS0YHV 73
093345 -11 1018  IS0YHV G6ZYF IO92 (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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