R2ZCA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO81

Receiver-side FT8 activity involving R2ZCA, decoded by SO8OO in southeastern Poland. 1,505 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 53 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-20.

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 1,505 FT8 messages attributed to R2ZCA as the transmitting token by decoded message structure across 53 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (71%), followed by 20 m (27%) and 10 m (1%). Most decodes (50%) fell within the six-hour window 01:00-07:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10.1 dB.

Overview

1,505

Messages attributed

UTC dates decoded

248

Active 15-min windows

-10.1 dB

Estimated median S/N

Bands

80m · 1 40m · 1,075 20m · 410 10m · 19

First attributed message: 2026-06-06
Last attributed message: 2026-09-20 03:52 UTC

Observed FT8 message patterns

Attributed sample: 1,505 messages
Active dates: 53 UTC dates
Estimated median S/N: -10.1 dB
Estimated 10th-90th percentile: -20.5 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 454, moderate (-15 to -9 dB) 432, strong (≥ -8 dB) 619.

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 R2ZCA in decoded directed-looking exchanges:

R6AO · European Russia ×2 R8CKD · Asiatic Russia ×2 R9AL · Asiatic Russia ×2 RA1AGA · European Russia ×2 RI1FJL · Franz Josef Land ×2 RZ5D · European Russia ×2 KB3Z · United States ×2 R4UAS · European Russia ×2 RU6UR · European Russia ×2 UA4LCC · European Russia ×2 UI6O · European Russia ×2 DL1TKL · Fed. Rep. of Germany

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 R2ZCA

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: KO81 · 904 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,083 km (approx.)
Last such locator decoded: 2026-09-20 03:52 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	R2ZCA S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 03:15	40m	-1 / +1	HB9CXZ	+8 / -9	7	✓ Full exchange observed
09-20 03:09	40m	+6 / -	ON8WR	-17 / -19	4	✓ Closing observed
09-20 03:07	40m	+4 / -	OM6APJ	- / -3	2	✓ Closing fragment
09-20 03:05	40m	- / -	RT6DU	-6 / -	5	Partial capture
09-20 03:02	40m	-8 / -6	UA9SY	-17 / -6	6	✓ Full exchange observed
09-20 03:00	40m	-7 / -	4Z5PT	- / -13	3	✓ Closing fragment
09-20 02:31	40m	-19 / +6	UB8QBI	-12 / -	2	Partial capture
09-20 02:29	40m	- / +4	OS4K	-9 / -	3	Partial capture
09-20 02:28	40m	- / -4	C31KC	-18 / -	3	✓ Closing fragment
09-18 18:55	40m	-1 / -9	R2EA/P	-2 / -5	5	✓ Full exchange observed
09-18 18:51	40m	0 / -	R1IO	- / -	3	Partial capture
09-18 18:49	40m	-7 / -	UB6LUR	- / -9	2	✓ Closing fragment
09-18 18:12	40m	-1 / -	RW6HPS	- / -10	2	✓ Closing fragment
09-18 18:10	40m	- / -9	R3XBS	-2 / -	2	✓ Closing fragment
09-14 01:55	40m	- / -9	IW2MYH	-4 / -	2	Partial capture
09-12 04:14	40m	-3 / -	4Z5NN	- / -	2	Partial capture
09-12 04:10	40m	-12 / -	RA9AIF	- / -15	2	Partial capture
09-12 04:10	40m	- / -17	RU3KO	0 / -	2	Partial capture
09-12 04:09	40m	- / -	R7OF	-6 / -	2	Partial capture
09-12 04:06	40m	-4 / -7	R3BGU	-17 / -5	6	✓ Full exchange observed
09-12 04:04	40m	-4 / -	DL8WEM	- / -8	2	✓ Closing fragment
09-12 03:29	40m	-1 / -	SP1ZMO	- / -12	3	Partial capture
09-12 03:18	40m	-6 / -	NS4P	- / -	4	Partial capture
09-12 02:56	40m	-24 / -15	N2BRJ	-11 / -17	4	✓ Full exchange observed
09-12 02:14	40m	-20 / -	RM9WU	- / -6	3	✓ Closing fragment
09-12 02:12	40m	-17 / +1	SV9QWC	-13 / -2	4	✓ Full exchange observed
09-12 02:11	40m	-18 / -	UB3ADO/P	- / -	2	Partial capture
09-12 02:01	40m	-19 / -	ON1DGN	- / -14	2	✓ Closing fragment
09-12 02:01	40m	- / -13	RX7O	-8 / -	2	Partial capture
09-12 01:59	40m	-19 / -	HB9ZHK	- / -23	2	✓ Closing fragment
09-11 18:01	40m	- / -9	RN4HAB	-6 / -	2	✓ Closing fragment
09-11 15:26	40m	-7 / -	UB4HVI	- / -15	2	✓ Closing fragment
09-11 15:25	40m	-4 / 0	RM4N	-14 / -2	4	✓ Full exchange observed
09-11 15:23	40m	- / -14	RC6OZ	-10 / -	3	✓ Closing fragment
09-11 15:20	40m	-3 / -	RW3SB	-13 / -	5	✓ Closing observed
09-11 15:19	40m	-6 / -11	RU3GC	+3 / -9	3	Partial capture
09-11 15:17	40m	-6 / -14	R2YW	-2 / -6	5	✓ Full exchange observed
09-11 15:05	40m	-4 / -	UA2FFD	- / -	2	Partial capture
09-11 15:04	40m	-8 / -	RK3YWA	- / -11	2	✓ Closing fragment
09-11 14:58	40m	-2 / -	R9CS/P	- / 0	2	✓ Closing fragment
09-11 14:46	40m	-6 / -	UA3SCU	-15 / -19	6	✓ Full exchange observed
09-11 14:46	40m	-6 / -	UB3ADO/P	- / -7	3	✓ Closing fragment
09-11 14:45	40m	-6 / -	RQ6B	-17 / -1	3	✓ Closing observed
09-11 03:13	40m	-10 / -	RY4D	- / -12	2	✓ Closing fragment
09-11 03:07	40m	-14 / -	K7ACZ	- / -17	3	Partial capture
09-11 03:06	40m	-20 / -	RN1ON	- / -11	2	✓ Closing fragment
09-10 15:25	40m	+1 / -	UA4HJ	+2 / -5	5	✓ Closing observed
09-10 15:22	40m	0 / -	JG4AKL	- / -4	5	✓ Closing fragment
09-10 15:17	40m	-1 / -	JG4AKL	- / -	6	Partial capture
09-10 15:09	40m	-2 / -	UA9ZZ	- / -12	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
031615 +10 1581  R2ZCA HB9CXZ R+01
031630  -2 1957  HB9CXZ R2ZCA RR73
031645  +9 1581  R2ZCA HB9CXZ 73
031700  -1 1957  CQ R2ZCA KO81 (x8)
032045  -9 1266  R2ZCA UB4CGR -19
032100  +2 1957  CQ R2ZCA KO81 (x2)
035245  +1 1957  HK3YL R2ZCA KO81

80m

UTC    dB Audio  Message
181915 -15 1831  RA6ZS R2ZCA 73

20m

UTC    dB Audio  Message
083915  -2 2293  RX6DA R2ZCA R-14 (x2)
084200 -16 2373  R2ZCA UA9LKL +04
084215 -10 2293  UA9LKL R2ZCA R-06
084315  -2 2293  CQ R2ZCA KO81 (x2)
084600  -3 2292  OH2ZZ R2ZCA KO81
084645 -15 1853  R2ZCA OH2ZZ -08
084730  -9 2292  OH2ZZ R2ZCA R+01
095745 -15 2293  UF4S R2ZCA KO81 (x2)
095830  -3 1291  R2ZCA UF4S -12
095845  -6 2293  UF4S R2ZCA R-08
095900  +2 1291  R2ZCA UF4S RR73
095915  -7 2293  UF4S R2ZCA 73

160m

UTC    dB Audio  Message
192130  -5  733  R2ZCA UA3ZNQ KO81 (x3)

10m

UTC    dB Audio  Message
052230 -10 1846  HA5RE R2ZCA KO81 (x3)
062245 -24 1910  OH3OJ R2ZCA R+04
062300 -10  494  R2ZCA OH3OJ RR73
062415 -19 1909  ER1PL R2ZCA KO81
065745 -23 1945  <...> R2ZCA R-09
071945 -24 1871  DL1TKL R2ZCA 73
104400 -21 1915  R2ZCA R6BH -05

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.

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