RK4F — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO23

Receiver-side FT8 activity involving RK4F, decoded by SO8OO in southeastern Poland. 978 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 54 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-10-16.

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 978 FT8 messages attributed to RK4F as the transmitting token by decoded message structure across 54 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (37%), followed by 80 m (25%) and 160 m (21%). Most decodes (61%) 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 -8 dB.

Overview

978

Messages attributed

UTC dates decoded

143

Active 15-min windows

-8 dB

Estimated median S/N

Bands

160m · 210 80m · 249 40m · 129 20m · 361 10m · 29

First attributed message: 2026-06-12
Last attributed message: 2026-10-16 16:58 UTC

Observed FT8 message patterns

Attributed sample: 978 messages
Active dates: 54 UTC dates
Estimated median S/N: -8 dB
Estimated 10th-90th percentile: -19 to +10 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 206, moderate (-15 to -9 dB) 274, strong (≥ -8 dB) 498.

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 RK4F in decoded directed-looking exchanges:

R5AV · European Russia ×3 RA6ATZ · European Russia ×3 RT2P · European Russia ×3 LA9JKA · Norway ×2 OM3SX · Slovak Republic ×2 RA5AD · European Russia ×2 RM5F · European Russia ×2 UN7LAN · Kazakhstan ×2 7Z1BQ · Saudi Arabia DN9OPA · Fed. Rep. of Germany IK4LZH · Italy 8S2C · Sweden

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 RK4F

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: LO23 · 513 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,639 km (approx.)
Last such locator decoded: 2026-10-15 19:51 UTC

Other locator fields attributed to this token: LO22 (1).

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	RK4F S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-18 04:01	80m	- / -	PE2JMR	+8 / -	2	Partial capture
10-16 16:57	80m	-5 / +3	RU3T	+3 / -3	5	✓ Full exchange observed
10-16 16:57	80m	-22 / -	R8QA	- / -6	2	✓ Closing fragment
10-16 16:53	80m	-7 / -	RW3DBX	- / -5	2	✓ Closing fragment
10-16 16:52	160m	- / -6	DA1TT	-14 / -	4	Partial capture
10-15 19:51	80m	-6 / -13	IZ8WGR	-4 / -	3	Partial capture
10-15 19:45	80m	- / -5	OH8WW	+6 / -	2	✓ Closing fragment
10-15 19:45	80m	- / -2	R5AV	-2 / -	2	✓ Closing fragment
10-15 19:44	80m	-1 / -	OE3KJO	- / -	2	Partial capture
10-15 19:40	160m	- / -	PA3FR	-10 / -	2	Partial capture
10-15 19:36	160m	-19 / +6	UA9JCH	-23 / -13	3	✓ Full exchange observed
10-15 19:34	160m	- / -	PA3FR	-8 / -	2	Partial capture
10-15 19:27	160m	-9 / -9	PE0FK	+3 / -	2	Partial capture
10-15 19:25	160m	-15 / -4	8S2C	-7 / -10	5	✓ Full exchange observed
10-13 18:42	160m	-18 / -6	RL3FA	-14 / -	4	✓ Closing observed
10-13 18:41	160m	-18 / +8	RA5AD	-15 / -	4	✓ Closing observed
10-13 18:25	40m	-11 / -14	IQ3TR	+3 / -	3	✓ Closing observed
10-13 18:20	80m	-4 / -	R2APC	-6 / -1	5	✓ Full exchange observed
10-13 18:18	80m	0 / -	M0MHX	- / -	2	Partial capture
10-13 18:16	80m	-7 / -8	9A6CC	0 / -13	4	✓ Full exchange observed
10-13 18:13	80m	-6 / +1	R4HGK	-9 / -	3	Partial capture
10-13 18:12	80m	-6 / -	R7ZY	-12 / -	3	✓ Closing observed
10-13 18:11	80m	-4 / -	RU4HU	- / -4	2	✓ Closing fragment
10-13 18:07	80m	-2 / -10	OZ4VV	+3 / -7	4	✓ Full exchange observed
10-13 18:04	80m	-3 / 0	OM1TD	0 / -	3	✓ Closing observed
10-13 18:01	80m	-3 / -10	DL5MO	-7 / -	4	✓ Closing observed
10-13 18:01	80m	-2 / +10	UA3RBM	-16 / -2	4	✓ Full exchange observed
10-13 18:00	80m	-4 / -12	DL1SUZ	+8 / -6	5	✓ Full exchange observed
10-13 17:56	160m	-12 / -12	9A2NO	+6 / -22	4	✓ Full exchange observed
10-13 17:52	160m	-11 / -12	HA5AO	+6 / -17	3	✓ Full exchange observed
10-13 17:51	160m	-13 / -3	SV5BYP	-22 / -10	5	✓ Full exchange observed
10-13 17:49	160m	-13 / -1	RT2P	-4 / -	2	Partial capture
10-12 19:28	160m	- / -20	R7RF	-16 / -	2	✓ Closing fragment
10-12 19:23	160m	- / -11	OK7BB	0 / -	3	✓ Closing fragment
10-12 19:11	160m	-18 / -14	S59A	+18 / -15	7	✓ Full exchange observed
10-12 19:09	160m	-17 / -10	UA1A	-3 / -	5	✓ Closing observed
10-12 19:08	160m	- / -	R7CD	-11 / -	3	Partial capture
10-12 19:06	160m	-18 / -	R1BLO/P	- / -	3	Partial capture
10-12 19:06	160m	- / -4	S59A	+14 / -	2	Partial capture
10-12 19:03	160m	-16 / -	UN0GY	- / -15	2	✓ Closing fragment
10-10 06:42	10m	- / -	R8DV	-6 / -	2	Partial capture
10-09 19:19	80m	- / -	IK0VAQ	-12 / -	2	Partial capture
10-09 19:19	80m	0 / -2	SP5KG	+16 / -9	4	✓ Full exchange observed
10-09 19:17	80m	0 / -	OH5SY	- / -16	2	✓ Closing fragment
10-09 19:11	80m	-3 / -5	UC6D	+2 / 0	4	✓ Full exchange observed
10-09 19:09	80m	0 / -	G7UHT	- / -	2	Partial capture
10-09 19:06	80m	+5 / -	R4SCQ	- / -17	2	✓ Closing fragment
10-09 19:05	80m	+4 / -24	LA9JKA	-17 / -13	7	✓ Full exchange observed
10-09 19:05	80m	+3 / -	UA3PQN	- / -3	2	✓ Closing fragment
10-09 19:01	80m	-2 / -12	R2BPS	-21 / -7	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
105800 -18 1850  IK4LZH RK4F +00
105815  +2  488  RK4F IK4LZH R+10
105830 -24 1850  IK4LZH RK4F RR73
105845  +1  488  RK4F IK4LZH 73
105900 -20 1850  LZ3AN RK4F LO23
110030 -21 1850  CQ RK4F LO23
110145 -24 1851  RK4F DN9PMH -21
110200 -21 1850  R2FDU RK4F R-03
110315 -24 1852  RK4F DN9PMH -21
110330 -22 1850  CQ RK4F LO23
110815 -18 1849  R6TY RK4F R-08
111430 -18 1850  RK4F DL3NGN JN59
064215  -5  508  RK4F R8DV MO08 (x2)
123615  -9  439  RK4F 7Z1BQ RR73

160m

UTC    dB Audio  Message
193615 -20 1636  CQ RK4F LO23
193645 -19 1637  UA9JCH RK4F -13
193700 -23 1700  RK4F UA9JCH R+06
193715 -19 1636  UA9JCH RK4F RR73
193915 -19 1636  CQ RK4F LO23 (x2)
194000  -7 1925  RK4F PA3FR JO33
194015 -20 1636  SV3GKT RK4F LO23
194030 -14 1925  RK4F PA3FR JO33
165215 -16 1852  RK4F DA1TT -06 (x4)
162500 -20 1265  RK4F R4II +14
134715 -10  549  RK4F R7MR -08

80m

UTC    dB Audio  Message
195045  -6 1637  SM4UPU RK4F 73
195115  -7 1637  IZ8WGR RK4F LO23 (x2)
195200  -4 1637  RK4F IZ8WGR -13
165315  -6 1666  RW3DBX RK4F R-05 (x2)
165700 -20 2137  R8QA RK4F R-06
165715  +5  576  RK4F RU3T LO16
165730 -24 2137  R8QA RK4F 73
165745  +0  576  RK4F RU3T LO16
165800  -5 2137  RU3T RK4F -03
165815  +3  576  RK4F RU3T R+03 (x2)
040115  +4  402  RK4F PE2JMR JO33 (x2)

40m

UTC    dB Audio  Message
174700  -3 1223  IZ4EFV RK4F -15
174730  -2 1223  CQ RK4F LO23 (x2)
175545  -8  912  RU1QX RK4F LO23
175745  -7  912  EA4HW RK4F LO23
180030  -6  911  RK4F RA3LBW 73
180400 -11  912  RK4F F1IQH JN27
144145 -13  869  UB3BDB RK4F LO23
144215 -11  869  CQ RK4F LO23                          a1 (x2)
182545  +0 1344  RK4F IQ3TR -14 (x2)
182630 -11 2239  IQ3TR RK4F 73
182845  -5 2302  RK4F PD1RP RR73
061800 -22 1539  RK4F UB6LUR -08

20m

UTC    dB Audio  Message
083115 +13 1062  F4NKF RK4F -13 (x3)
083415 +11 2203  CQ RK4F LO23 (x2)
083500 -15 2203  RK4F G0HVR IO91
083515 +12 2203  G0HVR RK4F -09 (x2)
083600 -11 2203  RK4F G0HVR R-21
083615 +15 2203  G0HVR RK4F RR73
083630 -17 2203  RK4F G0HVR 73
083715  +2 2203  GW4ONI RK4F LO23 (x3)
132715 -22 1279  F1IQH RK4F -12

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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