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Old 08-11-2019, 03:03   #1
Digger
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KTWR on 7500 kHz, DRM to Japan (B19)

KTWR to Japan logged for 14 minutes from 1228-1242 UTC. Good tonight. Max. 23,60 dB SNR and 99,92% decoded audio. Meta Data: 10,26 kbps, EEP, aac, Mono, English, Religion, Guam, ID:1001. Technical: Mode B/10, 2s, 4/16 QAM, P:0/0, A:1/D:1 Timestamp: Yes. MOT Slide Show: I received three slides using the DRM Software Radio 2.0.38 because the MOT Slide Show did not work with DReaM V 2.1.1.

Later when I played back the 12 kHz IF mp3 file from my Newstar DR-111 I got a total of 10 slides. One of the slides was a QSL Card for the transmission on the 7th Nov. 2019. Nice!
Attached Images
File Type: png 7500-191107-1228-1242-Hatori.png (39.4 KB, 92 views)
File Type: jpg all3slides.jpg (39.8 KB, 84 views)
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Last edited by Digger : 08-11-2019 at 04:26.
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Old 21-11-2019, 00:52   #2
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A late report. KTWR to Japan logged with FRG-7700 for 14 minutes from 1228-1242 UTC. Bad propagation conditions tonight. Max. 9,7 dB SNR and 8,42% decoded audio. There were no Text Messages in the Message in DReaM. The Audio Spectrum was limited to 4000 Hz.
Attached Images
File Type: png 7500-191114-1228-1242-Hatori-7700.png (41.9 KB, 66 views)
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Old 22-11-2019, 01:46   #3
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21 Nov.2019

I used two receivers, the FRG-7700 and the DR-111. The DR-111 was sitting on the desk beside my PC using its telescopic antenna and powered by a 5V GP Power Bank 5200. The broadcast was in Japanese tonight.

1. KTWR to Japan logged with FRG-7700 for 14 minutes from 1228-1242 UTC. Good tonight. Max. 17,75 dB SNR and 91,18% decoded audio (99,57% from 1233 UTC). Meta Data: 10,72kbps, EEP, aac, Mono, Chinese (Mandarin) [!], Religion, Guam, ID:1003. Technical: Mode B/10, 2s, 4/16 QAM, P:0/0, A:1/D:1 Timestamp: Yes. There were Text Messages in Japanese in the Message window in DReaM V 2.1.1. The Audio Spectrum was limited to 4000 Hz.

2. KTWR to Japan logged with DR-111 for 12 minutes from 1229-1241 UTC. Max. 17,00 dB SNR and 91,95% decoded audio. There were Text Messages in in the the display of the Newstar DR-111, but only "?" instead of Japanese as the DR-111 cannot display Unicode characters.
Attached Images
File Type: png 7500-191121-1228-1242-Hatori.png (40.0 KB, 73 views)
File Type: png 7500-191121-1229-1241-Hatori.png (37.5 KB, 61 views)
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Old 09-04-2020, 21:54   #4
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Only ten minutes! KTWR to Japan logged with FRG-7700 and DReaM for 10 minutes from 1233-1243 UTC. Good conditions tonight. Max. 19,64 dB SNR and 99,18% decoded audio). I also received three MOT slides using the DRM S/W Radio.
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File Type: png 7500-200409-1233-1243-Hatori.png (37.1 KB, 61 views)
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Old 16-04-2020, 12:38   #5
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16th Apr. 2020

KTWR to Japan. Saw the label and then it was over. Missed the whole thing!!
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Old 16-04-2020, 17:56   #6
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Quote:
Originally Posted by Digger
KTWR to Japan. Saw the label and then it was over. Missed the whole thing!!

Personally, I like the idea of shorter digital broadcasts, but 15 minutes is difficult to capture without some automated timer. KTWR should probably consider 30 minutes instead of 15 minutes for next season. Developing enough relevant content is always a challenge, though.
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Old 23-04-2020, 23:49   #7
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KTWR to Japan in Japanese logged with Airspy HF+ Discovery for 10 minutes from 1233-1243 UTC. Good conditions tonight too. Max. 21,75 dB SNR and 90,25% decoded audio. The log is too short to give a fair evaluation of the transmission. Hope KTWR can find a 30 minutes slot towards Japan soon.
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File Type: png 7500-200423-1233-1243-Hatori.png (40.0 KB, 45 views)
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Old 30-04-2020, 12:48   #8
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30th April

KTWR to Japan in Japanese logged with Airspy HF+ Discovery for 10 minutes from 1233-1243 UTC. Perfect conditions this evening. Max. 21,80 dB SNR and 100,00% decoded audio. Perfect reception with the Newstar DR-111 to with its built-in antenna.
Attached Images
File Type: png 7500-200430-1233-1243-Hatori.png (37.2 KB, 43 views)
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Old 04-05-2020, 01:57   #9
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New 30 min. DRM broadcast to Japan on 7500 kHz

KTWR to Japan in Japanese logged with Airspy HF+ Discovery for 14 minutes from 1246-1300 UTC. At 1300 UTC I switched from the Airspy to the Yaesu FRG-7700. That's why there is a break in the log around this time. Reason for the switch was to see if there were any annoying re-syncs using the FRG-770. The rest of the transmission was logged for 15 minutes from 1300-1315 UTC.

The programme began at 1249 UTC after a long interval signal. I listened to the Japanese transmission in parallel with the Newstar DR-111 using its built-in antenna. Good reception. The DR-111 decoded everything perfectly. After switching to the 12 kHz Line Input I could decode the MOT Slide Show with the DRM Software Radio. There were two slides, one showing the TWR Logo and one with a picture of the antennas in the sunset.

Excellent conditions this evening. Max. 21,18 dB SNR and 96,40% decoded audio (including the break when changing receivers. When I split the log I got 88,5% decoded audio with the Airspy with its re-syncs and 99,0% with the FRG-7700. I did not make a log of the transmission with the DR-111.

The FRG-7700 S-meter showed S5-6 (22-27 dBuV). The Audio Spectrum ended at more than 11000 Hz. Very pleasant audio. Around 1330 UTC the Bitrate switched from 13,18 to 11,18 kbps and the Label was 'KTWR Japanese'. Later around 1333 UTC the Label had changed to KTWR DRM English. There was no decoded audio after 1315 UTC and during the 'English' transmission.
Attached Images
File Type: png 7500-200503-1245-1345-Hatori.png (48.0 KB, 40 views)
File Type: jpg 2020-05-03-7500-khz-slides-only.jpg (65.6 KB, 41 views)
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Old 11-05-2020, 00:35   #10
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KTWR to Japan in Japanese logged with FRG-7700 for 29 minutes from 1245-1315 UTC. Max. 17,29 dB SNR and 97,26% decoded audio. The program started at 1248 UTC after the interval signal. I listened with the DR-111 in parallel, but not so good decoding in the beginning with the telescopic antenna. From 1301 UTC more or less the same decoding on the DR-111 as with the FRG 7700. There were five slides, Plumeria flower, beach, flower, TWR logo and palm trees. The Audio was pleasant to listen to.
Attached Images
File Type: png 7500-200510-1245-1315-Hatori.png (38.5 KB, 41 views)
File Type: jpg plumeria-slide.jpg (14.8 KB, 41 views)
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Old 18-05-2020, 11:26   #11
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Not so good on the 17th. I will write more later.

KTWR to Japan in Japanese logged with FRG-7700 for 29 minutes from 1246-1315 UTC. Max. 14,26 dB SNR and 86,58% decoded audio.
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File Type: png 7500-200517-1246-1315-Hatori.png (30.7 KB, 17 views)
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Last edited by Digger : 01-06-2020 at 02:55.
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Old 01-06-2020, 04:24   #12
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KTWR to Japan in Japanese logged with FRG-7700 for 29 minutes from 1246-1315 UTC. Max. 17,68 dB SNR and 98,41% decoded audio. Audio spectrum: ~11000 Hz. Sound quality: Good. There were MOT Slides, at least six were decoded.
Attached Images
File Type: png 7500-200524-1246-1315-Hatori.png (27.9 KB, 15 views)
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Old 01-06-2020, 04:26   #13
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KTWR to Japan in Japanese logged with FRG-7700 for 29 minutes from 1246-1315 UTC. Max. 23,01 dB SNR and 99,92% decoded audio. There were seven MOT slides. Perfect reception tonight.
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File Type: png 7500-200531-1246-1315-Hatori.png (30.7 KB, 16 views)
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Old 09-06-2020, 00:51   #14
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KTWR to Japan in Japanese logged with FRG-7700 for 29 minutes from 1246-1315 UTC. Max. 14,89 dB SNR and 92,67% decoded audio.

An unattended log.
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File Type: png 7500-200607-1246-1315-Hatori.png (28.3 KB, 15 views)
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Old 15-06-2020, 00:38   #15
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KTWR to Japan in Japanese logged with FRG-7700 for 28 minutes from 1247-1315 UTC. Max. 22,09 dB SNR and 99,08% decoded audio.
Attached Images
File Type: png 7500-200614-1247-1315-Hatori.png (28.6 KB, 16 views)
File Type: jpg slide-cave.jpg (34.3 KB, 13 views)
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