OH5C — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Finland Most frequent locator attributed to this token: KP30

Receiver-side FT8 activity involving OH5C, decoded by SO8OO in southeastern Poland. 53 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-09-15.

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 53 FT8 messages attributed to OH5C as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (34%), followed by 80 m (34%) and 20 m (28%). Most decodes (75%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

160m · 18 80m · 18 40m · 2 20m · 15

First attributed message: 2026-06-11
Last attributed message: 2026-09-15 19:19 UTC

Observed FT8 message patterns

Attributed sample: 53 messages
Active dates: 7 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -17 to -5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 24, strong (≥ -8 dB) 16.

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 OH5C in decoded directed-looking exchanges:

RA4FHO · European Russia ×2 EA8UP · Canary Islands DG0JK · Fed. Rep. of Germany OH0ERF · Aland Islands RA3LCI · European Russia SP7SEK · Poland UA3FH · European Russia UT6HN · Ukraine EA5BCO · Spain F1PSX · France F4LNM · France F4MGP · France

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 OH5C

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: KP30 · 22 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,219 km (approx.)
Last such locator decoded: 2026-08-31 14:29 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	OH5C S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 18:42	80m	-1 / -	VK6IR	- / -22	3	✓ Closing fragment
08-28 18:37	80m	- / -	UA3UBV	-7 / -	2	Partial capture
08-28 18:35	80m	-8 / -12	RK9UM	-18 / 0	6	✓ Full exchange observed
08-28 18:34	80m	-11 / -7	DL9KM	-5 / -	4	✓ Closing observed
08-28 18:32	80m	-7 / -13	R2AL	+2 / +8	9	✓ Full exchange observed
08-28 18:32	80m	-8 / -14	F5HNQ	-15 / -7	4	✓ Full exchange observed
08-28 18:30	80m	-8 / 0	SP2L	+4 / -	3	✓ Full exchange observed
08-28 18:29	80m	-8 / -9	RA4FHO	+4 / 0	4	✓ Full exchange observed
08-28 18:25	80m	-13 / -8	YO4NT	+4 / +9	3	✓ Full exchange observed
08-28 18:23	80m	-15 / -9	SQ8V	+2 / -	5	✓ Closing observed
08-28 18:23	80m	-14 / -10	US7KC	+11 / -	3	Partial capture
08-14 19:42	40m	- / -	2E0IJC	-15 / -	2	Partial capture
08-14 19:26	20m	- / +2	G1JMT	-10 / -	2	Partial capture
08-14 19:23	20m	- / -18	M0KQV	-11 / -	2	Partial capture
08-14 19:20	20m	- / +4	MM7BWK	-20 / -	2	Partial capture
08-14 19:09	20m	- / -	F1PPH	-4 / -	3	Partial capture
08-14 19:01	20m	- / -20	EA5BCO	-11 / -	5	✓ Closing fragment
08-14 19:01	20m	- / -	F1PPH	-10 / -	2	Partial capture
08-09 19:19	160m	-14 / -2	SP9WAZ	-8 / -11	2	Partial capture
08-09 19:14	160m	- / -13	DG0JK	+5 / -	4	✓ Closing fragment
08-09 19:13	160m	- / -	OH1JP	+8 / -	2	Partial capture
08-09 19:10	160m	-15 / -7	RA3LCI	-20 / -	3	✓ Closing observed
08-09 19:10	160m	- / -7	SP3PLD	+6 / -	2	Partial capture
08-09 19:10	160m	- / -	SP7SEK	+2 / -	2	✓ Closing fragment
08-09 19:09	160m	- / -1	UT6HN	+3 / -	3	✓ Closing fragment
08-09 19:09	160m	-9 / +4	UA3FH	-12 / -2	3	✓ Full exchange observed
08-09 19:07	160m	- / -	SP7SEK	+10 / -	2	Partial capture
08-09 19:05	160m	-15 / -23	OH0ERF	-22 / +1	5	✓ Full exchange observed
08-06 18:09	20m	- / -12	RZ4FWA	-14 / -	4	Partial capture
08-06 17:51	20m	- / -12	R4FES	-11 / -	5	Partial capture
08-05 05:53	20m	- / -	IK3SSW	+3 / -	4	Partial capture
08-02 20:24	10m	- / -9	CT2IGO	-5 / -	13	Partial capture
08-02 20:17	10m	- / -	CR7BXA	-10 / -	4	Partial capture
08-02 20:13	10m	- / -4	EA8UP	-3 / -	4	✓ Closing fragment
07-14 05:03	20m	- / -	F4LNM	-14 / -	3	✓ Closing fragment
07-14 04:59	20m	- / -	F4LNM	-16 / -	2	Partial capture
07-13 03:57	20m	- / -17	RA6OY	+8 / -	3	✓ Closing fragment
07-11 11:18	20m	- / -	F1PSX	-13 / -	2	✓ Closing fragment
07-11 11:03	20m	- / -9	LB2YJ	-18 / -	2	✓ Closing fragment
07-06 15:37	20m	- / -14	F4HSB	-18 / -	3	Partial capture
07-06 15:37	20m	- / -3	PD1ACS	-18 / -	4	✓ Closing fragment
07-06 15:23	20m	- / -11	PD1HPB	-20 / -	4	✓ Closing fragment
06-30 03:45	20m	- / -	RZ4FWA	-6 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
194215 -15 1956  OH5C 2E0IJC IO95 (x2)
142915 -15 2438  VJ6X OH5C KP30
191915  -4 2062  RI1FJZ OH5C R-01

80m

UTC    dB Audio  Message
183515  -3 2245  OH5C DL9KM 73
183530  -5 1742  R2AL OH5C RR73
183545 -20 1741  OH5C RK9UM NO35
183545  +2 1453  OH5C R2AL 73
183600  -8 1742  RK9UM OH5C +00
183615 -16 1742  OH5C RK9UM R-12
183630  -7 1742  RK9UM OH5C RR73
183645 -20 1742  OH5C RK9UM 73
183700  -1 1742  CQ OH5C KP30
183745  -8 1074  OH5C UA3UBV LO07 (x2)
184245  +0  710  VK6IR OH5C KP30 (x3)
184530  +5  954  OH5C LZ3SD KN22

20m

UTC    dB Audio  Message
190500 -24 1996  CQ OH5C KP30                          a1
190630 -24 1995  F4MGP OH5C RR73
190915  -4 1995  OH5C F1PPH JN07 (x3)
191815 -24 1996  OH5C PA0GSP 73
192045 -19 1996  OH5C MM7BWK IO85 (x2)
192315 -14  963  OH5C M0KQV R-18 (x2)
192645 -10  629  OH5C G1JMT IO92 (x2)
192815 -14  629  OH5C RC6OT KN87
193015 -10  728  OH5C G1JMT 73
123445  -2  641  OH5C G8RZ IO84

160m

UTC    dB Audio  Message
191330 -14 2121  R1TAX OH5C R+03
191415 +13 2832  OH5C OH1JP R+15
191445  +4  997  OH5C DG0JK JO60 (x4)
191630 -19 2121  CQ OH5C KP30 (x4)
191830 -13 2121  UD8S OH5C R-02
191915  -8 1889  OH5C SP9WAZ -02
191930 -14 2121  SP9WAZ OH5C R-11
192030 -14 2121  CQ OH5C KP30 (x2)

10m

UTC    dB Audio  Message
201845  -9 2284  OH5C CR7BXA IN51 (x2)
202445  -6 1641  OH5C CT2IGO IN60 (x13)

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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