YO4FRF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Romania Most frequent locator attributed to this token: KN44

Receiver-side FT8 activity involving YO4FRF, decoded by SO8OO in southeastern Poland. 2,132 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 38 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-27.

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 2,132 FT8 messages attributed to YO4FRF as the transmitting token by decoded message structure across 38 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (41%), followed by 60 m (26%) and 40 m (20%). Most decodes (71%) 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 -11 dB.

Overview

2,132

Messages attributed

UTC dates decoded

210

Active 15-min windows

-11 dB

Estimated median S/N

Bands

160m · 1 80m · 260 60m · 554 40m · 416 20m · 874 10m · 27

First attributed message: 2026-06-06
Last attributed message: 2026-08-27 18:57 UTC

Observed FT8 message patterns

Attributed sample: 2,132 messages
Active dates: 38 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -19 to +6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 578, moderate (-15 to -9 dB) 685, strong (≥ -8 dB) 869.

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 YO4FRF in decoded directed-looking exchanges:

ES6DO · Estonia ×2 HA7TM · Hungary ×2 RK4FF · European Russia T77R · San Marino A41KB · Oman BG5BNW · China BH4SCF · China BH4THI · China DK8ZZ · Fed. Rep. of Germany EA4GFG · Spain EA8UP · Canary Islands GJ0VJP · Jersey

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 YO4FRF

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: KN44 · 1,601 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 813 km (approx.)
Last such locator decoded: 2026-08-27 18:57 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	YO4FRF S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-27 18:57	60m	-21 / -18	DD3VV	-17 / -	3	✓ Closing observed
08-27 18:55	60m	-18 / -13	IK4CBO	-10 / -6	5	✓ Full exchange observed
08-27 18:54	60m	-21 / -18	DL5DQZ	-9 / -7	5	✓ Full exchange observed
08-27 15:13	20m	-14 / -	HF5A	- / -	3	Partial capture
08-24 19:49	60m	-20 / -12	OH1LA	-13 / -15	4	✓ Full exchange observed
08-24 19:48	60m	-17 / -7	SQ8AA	+8 / -5	5	✓ Full exchange observed
08-24 19:41	60m	-17 / -	DF7JU	- / -	2	Partial capture
08-24 19:39	60m	- / -	IZ6CLN	-8 / -	2	✓ Closing fragment
08-24 19:37	60m	-17 / 0	ER1CW	-11 / -	2	✓ Closing observed
08-24 19:32	60m	-17 / -	GE3TXA	- / -	8	Partial capture
08-24 19:24	60m	-19 / -	DK2CC	- / -	3	Partial capture
08-24 19:10	60m	-19 / -6	YL2CA	-1 / -	3	✓ Closing observed
08-24 19:08	60m	-21 / -15	GW4FRX	-3 / -	3	✓ Closing observed
08-24 19:02	60m	-18 / -	GW4FRX	- / -	4	Partial capture
08-24 19:00	60m	-16 / -9	OE6HLF	-7 / -8	5	✓ Full exchange observed
08-24 18:59	60m	-16 / -11	ES6DO	-2 / -12	5	✓ Full exchange observed
08-24 18:55	60m	-15 / -	LB6LK	- / -	6	Partial capture
08-24 18:52	60m	-14 / -	IW2CAK/2	- / -	4	Partial capture
08-24 18:49	60m	- / -15	IK0BAL	-14 / -	2	✓ Closing fragment
08-24 18:46	60m	-19 / -	YO3CWC	+5 / -	2	✓ Closing observed
08-24 17:33	40m	0 / -	IK1MJK/P	- / -5	2	Partial capture
08-24 17:30	40m	-1 / -18	EG5DX	-19 / -14	5	✓ Full exchange observed
08-23 20:08	60m	-19 / -	UN7EG	- / -	9	Partial capture
08-23 20:01	60m	-14 / -	F5NAA	- / -10	2	Partial capture
08-23 19:58	60m	-16 / -18	SM7WNM	-16 / -	4	✓ Closing observed
08-23 19:47	60m	-21 / -11	HA7TM	+10 / -1	5	✓ Full exchange observed
08-23 19:42	60m	-20 / -	IW9FRA	-17 / -19	4	✓ Closing observed
08-23 19:40	60m	-19 / -18	DL3IKE	-7 / -13	5	✓ Full exchange observed
08-23 19:37	60m	-19 / -	<...>	- / -15	5	Partial capture
08-23 19:32	60m	-20 / -	OZ1BJM	- / -	8	Partial capture
08-23 19:31	60m	-18 / -	IU3MAG	- / -	2	Partial capture
08-23 19:27	60m	-22 / -	IU3MAG	- / -	2	Partial capture
08-23 19:25	60m	- / -	HA7TM	+10 / -	3	Partial capture
08-23 19:22	60m	-21 / -	HA5AZD	-9 / -15	4	✓ Closing observed
08-23 19:16	60m	-20 / -19	LY3W	+1 / -	6	✓ Closing observed
08-23 19:12	60m	-21 / -13	IZ0MIT	-5 / -6	4	✓ Full exchange observed
08-23 19:10	60m	- / -12	SP9UPH	+12 / -	2	✓ Closing fragment
08-23 19:07	60m	-22 / -16	HB9DGZ	-2 / -7	3	✓ Full exchange observed
08-23 19:03	60m	- / +8	YO2CR	-2 / -	2	✓ Closing fragment
08-23 19:00	60m	- / -7	OM5JG	+4 / -	2	✓ Closing fragment
08-23 19:00	60m	- / -6	YO2NAA	-4 / -	5	✓ Closing fragment
08-23 18:58	60m	-19 / -18	DD6ZV	-11 / -	4	✓ Closing observed
08-23 18:55	60m	- / -6	SP9DB	-6 / -	2	✓ Closing fragment
08-23 18:54	60m	-23 / -18	EA2BUW	-10 / -	3	✓ Closing observed
08-23 18:47	60m	-20 / -10	OM7FS	-1 / -	5	✓ Closing observed
08-23 18:46	60m	-21 / -10	IV3DSG	-8 / -	3	✓ Closing observed
08-23 18:30	60m	-16 / -	4X1GA	- / -	21	Partial capture
08-23 17:28	40m	-8 / -	GB64MOD	- / -	3	Partial capture
08-21 20:34	40m	-1 / -	HV0KIS	- / -	38	Partial capture
08-21 20:17	60m	-15 / -	SP6TID	- / -	10	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
195100 -18 1739  CQ YO4FRF KN44                        a1
185345 -18 1776  EA5BY YO4FRF KN44
185430 -10 1845  YO4FRF DL5DQZ JO61
185445 -20 1777  DL5DQZ YO4FRF -07
185500  -8 1845  YO4FRF DL5DQZ R-18
185515 -22 1777  DL5DQZ YO4FRF RR73
185530 -12 2031  YO4FRF IK4CBO JN54
185530  -8 1845  YO4FRF DL5DQZ 73
185545 -18 1776  IK4CBO YO4FRF -06
185600 -11 2031  YO4FRF IK4CBO R-13
185615 -19 1776  IK4CBO YO4FRF RR73
185630  -8 2031  YO4FRF IK4CBO 73
185715 -21 1776  DD3VV YO4FRF KN44
185730 -20 1431  YO4FRF DD3VV -18 (x2)

20m

UTC    dB Audio  Message
144515  -3 1514  PD1RGW YO4FRF KN44 (x8)
152615  -3 1998  XU7O YO4FRF KN44 (x3)
151345 -20 1912  HF5A YO4FRF KN44 (x3)
152500 -22 1913  VU2WJ YO4FRF KN44

40m

UTC    dB Audio  Message
205330  +5 1984  HV0KIS YO4FRF KN44 (x4)
172800  -9 1956  <GB64MOD> YO4FRF KN44 (x3)
173045 -10 1993  EG5DX YO4FRF R-14
173200 -19 1139  YO4FRF EG5DX -18
173215  +2 1993  EG5DX YO4FRF R-12 (x3)
173345  -1 1993  IK1MJK/P YO4FRF KN44
173400 -21 1459  YO4FRF EN35UKR -06
173415  +0 1993  IK1MJK/P YO4FRF R-05

10m

UTC    dB Audio  Message
131115 -16 2304  YC1SDZ YO4FRF KN44 (x9)
111315  -7 2317  YO4FRF RK4FF +12 (x2)
122015 -18 2235  YO4FRF <...> -13
131800 -22 1908  YE1AJE YO4FRF KN44
134300 -24 1794  YO4FRF T77R RR73
134945 -24 1920  DF2RG YO4FRF KN44

80m

UTC    dB Audio  Message
185200  -2 2095  <II7MGXX> YO4FRF KN44 (x8)
185715  -3 2095  4X1FK YO4FRF KN44 (x2)
185845  -1 2095  II7MGXX YO4FRF KN44 (x2)
190015  -3 2095  UF4S/P YO4FRF KN44 (x3)

160m

UTC    dB Audio  Message
205700 -10 2123  CQ YO4FRF KN44

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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