CT4NH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Portugal Most frequent locator attributed to this token: IM58

Receiver-side FT8 activity involving CT4NH, decoded by SO8OO in southeastern Poland. 67 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 9 UTC dates in the available aggregate history. Observed between 2026-07-25 and 2026-09-19.

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 67 FT8 messages attributed to CT4NH as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (66%), followed by 40 m (25%) and 80 m (9%). Several six-hour UTC windows tied for the largest share (96%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (72%); the estimated median was 0 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

0 dB

Estimated median S/N

Bands

80m · 6 40m · 17 20m · 44

First attributed message: 2026-07-25
Last attributed message: 2026-09-19 20:23 UTC

Observed FT8 message patterns

Attributed sample: 67 messages
Active dates: 9 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -15 to +9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 48.

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 CT4NH in decoded directed-looking exchanges:

BA3NZ · China BA3QIQ · China BA7SAY · China BA8BLK · China BG7BMG · China BG7BVI · China EX7CQ · Kyrgyzstan OE7MAH · Austria R9AL · Asiatic Russia RD0L · Asiatic Russia RI1FJL · Franz Josef Land XU7O · Cambodia

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 CT4NH

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: IM58 · 33 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,737 km (approx.)
Last such locator decoded: 2026-09-19 20:20 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	CT4NH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 20:22	40m	-8 / -3	S51BW	+12 / -12	5	✓ Full exchange observed
09-18 21:59	80m	-24 / -	TA4/DD1WT	- / -	2	Partial capture
09-17 19:36	40m	- / -9	HZ1TT	-8 / -	3	✓ Closing fragment
09-17 19:28	40m	-18 / -	HZ1TT	- / -	2	Partial capture
09-15 18:29	40m	-4 / -	BH8SDS	- / -	2	Partial capture
09-11 17:47	40m	-7 / -20	RU9CK	-15 / -18	6	✓ Full exchange observed
09-11 17:41	40m	-11 / -14	EX7CQ	-2 / -6	5	Partial capture
09-04 20:35	80m	-15 / -15	JA3FYC	-16 / -	3	✓ Closing observed
09-04 20:32	80m	-9 / -	RI1FJL	- / -	3	Partial capture
08-27 19:42	20m	+20 / -9	BA3QIQ	-17 / -15	6	✓ Full exchange observed
08-27 19:41	20m	+10 / -	RI1FJL	- / -13	3	✓ Closing fragment
08-21 20:04	20m	+8 / -	A71YY	- / -	2	Partial capture
08-21 20:01	20m	+8 / -	R9AL	- / -18	2	✓ Closing fragment
08-21 19:59	20m	+4 / -	BA3NZ	- / -11	3	✓ Closing fragment
08-21 19:57	20m	+2 / -	BA8BLK	- / -14	2	✓ Closing fragment
08-21 19:56	20m	+6 / -	PA0ARR	- / -12	2	Partial capture
08-21 19:55	20m	+6 / -	OE7MAH	- / -14	2	✓ Closing fragment
08-21 19:54	20m	+3 / -	EX7CQ	- / -16	3	✓ Closing fragment
08-21 19:51	20m	-2 / -	BG7BMG	- / -13	3	✓ Closing fragment
08-21 19:50	20m	+1 / -	RD0L	- / -12	5	✓ Closing fragment
08-21 19:48	20m	- / -	OK2VCR	+5 / -	6	Partial capture
08-21 19:47	20m	+4 / -	BA7SAY	- / -18	2	✓ Closing fragment
08-21 19:42	20m	+3 / -	XU7O	- / -7	3	✓ Closing fragment
08-21 19:41	20m	+1 / -	BG7BVI	- / -	2	✓ Closing fragment
07-25 08:40	20m	-15 / -	PQ1I	- / -	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
183045  -3 2635  BH8SDS CT4NH IM58
192845 -18 1729  HZ1TT CT4NH IM58 (x2)
192945 -17 1859  F1LPT/P CT4NH IM58
193400 -11 2219  CT4NH YT6AAA KN04
193630  -9 1729  CT4NH HZ1TT -09 (x3)
201515 -12 1887  CN8NS CT4NH 73
202045 -14 1163  YC2BUZ CT4NH IM58
202230 +13 2639  CT4NH S51BW JN76
202245  -6 2639  S51BW CT4NH -12
202300 +14 2598  CT4NH S51BW R-03
202315 -10 2597  S51BW CT4NH RR73
202330  +8 2598  CT4NH S51BW 73

80m

UTC    dB Audio  Message
203200  -4 2638  RI1FJL CT4NH IM58 (x3)
203515 -14 2492  CT4NH JA3FYC -15 (x2)
203700 -15 2491  JA3FYC CT4NH 73
215900 -24 1406  <TA4/DD1WT> CT4NH IM58 (x2)

10m

UTC    dB Audio  Message
100215  -5  495  CT4NH <...> -02

20m

UTC    dB Audio  Message
200015  +2 2705  BA3NZ CT4NH 73
200115 +10 2706  R9AL CT4NH R-18 (x2)
200315 +10 2706  BI1HJR CT4NH IM58
200430 +11 2812  A71YY CT4NH IM58 (x2)
194145  +5 2699  RI1FJL CT4NH IM58 (x2)
194230 -14 2080  CT4NH BA3QIQ OM99
194245 +17 2699  RI1FJL CT4NH 73
194300 -20 2080  CT4NH BA3QIQ OM99
194315 +22 2699  BA3QIQ CT4NH -15
194330 -16 2079  CT4NH BA3QIQ R-09
194345 +17 2699  BA3QIQ CT4NH RR73
194400 -18 2080  CT4NH BA3QIQ 73

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