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Old 10-12-2010, 19:31   #541
FritzWue
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China, Portugal etc. have much better audio quality......in wide AM!
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Old 13-12-2010, 20:29   #542
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DRM car radio

Ahlen-B58-A1-A43-B525-Gescher
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Old 15-12-2010, 12:35   #543
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feedback on reception and quality - a link regarding

Hi all,
please see the link below, who receives the reception and quality reports of DRM transmissions from AIR Khampur.

http://www.allindiaradio.org/DRM/air-drm-service.html
at the end of page you find the address

The reception reports on technical quality of DRM Transmission on the above Short-wave frequencies are welcome and may be sent to Director (Spectrum Management & Synergy) through email: spectrum-manager@air.org.in
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Old 17-12-2010, 20:40   #544
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Dec. 17

Hi all,

A mostly unattended log. Overmodulated bad audio + hum.
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Old 01-01-2011, 19:05   #545
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Haha, laughing all the time when listening to AIR in DRM.
See:
http://blogs.rnw.nl/medianetwork/all...echnical-staff
Someone should tell them what all those little knobs are made for.
Zipped mp3 sample of tonight's excellent fm like audio quality attached.
Must download, unzip, and listen!
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File Type: zip 9950_110101_1925_DK6QI.mp3.zip (93.8 KB, 100 views)
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Old 02-01-2011, 17:57   #546
mvs sarma
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Quote:
Originally Posted by FritzWue
Haha, laughing all the time when listening to AIR in DRM.
See:
http://blogs.rnw.nl/medianetwork/all...echnical-staff
Someone should tell them what all those little knobs are made for.
Zipped mp3 sample of tonight's excellent fm like audio quality attached.
Must download, unzip, and listen!
P A I N F U L L........
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Old 02-01-2011, 22:03   #547
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It makes me nostalgic,when i was younger with my portable cassette recorder and a two transistor FM transmitter making radio for the neighbors.
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Old 15-01-2011, 06:20   #548
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Red face 17th Dec. 2010 in Japan

Hi John and all,
As I had no internet in Japan, here comes a late comparison to Mitajohn's log from the same day. AIR was received with some decoded audio. The audio sounded like they had connected the mike jack to the AC socket instead to the mike. Just aggressive hum. Very interesting pattern on 9950 kHz here - the signal rises from out of nowhere to a strong signal just after 0700 JST and disappears just as suddenly just before 0730 JST.

Did AIR give up DRM??

03.01.2011 at 2225-2230 UTC in DRM.
04.01.2011 at 2215-2230 UTC in AM.
05.01.2011 at 2218-2230 UTC in AM.
06.01.2011 at 2215-2230 UTC in AM.
09.01.2011 at 2215-2230 UTC in AM.
10.01.2011 at 2216-2230 UTC in AM.
11.01.2011 at 2212-2245 UTC in AM.
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Old 15-01-2011, 08:56   #549
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Hi Digger,

I also wondered about that, seemed AIR were in AM mode for some days, but the past days (since Jan 12th) I got again a DRM signal each day, results from Jan 13th attached.

Simone
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Old 16-01-2011, 20:49   #550
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Good rf signal, bad audio:
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Old 19-01-2011, 21:39   #551
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Well, better reception here in Switzerland than on the back lobe in Japan. In Japan the signal suddenly popped up around 2210 and almost disappeared 20 minutes later every morning (JST).
However, the hum sounded the same, here or there, AM or DRM, always hum in the background.

PS: I watched a Bollywood production on my return with SWISS back to Zrich last week, and the sound in the movie was perfect. No hum at all in that movie. Perhaps they should transfer some Bollywood staff to AIR?
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File Type: png 9950-110119-1824-2230-HED362@CH.png (38.9 KB, 74 views)
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Old 20-01-2011, 21:12   #552
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Terrible audio, even worse rf signal:
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File Type: png 9950_110120_2207_DK6QI.png (7.1 KB, 68 views)
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Old 24-01-2011, 21:42   #553
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Two logs, the first unattended. No idea what happened. Only noticed that the RF signal was very weak in the beginning of the log and when I looked later there was no signal at all.

Then after a while - don't know when for sure, the DRM was back with overmodulated horrible audio, almost impossible to understand what the lady was talking about. At the end, after 2230 UTC one could enjoy 5 minutes overtime with hum.
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File Type: png 9950-110124-1838-2059-HED362@CH.png (33.8 KB, 60 views)
File Type: png 9950-110124-2152-2229-HED362@CH.png (35.2 KB, 64 views)
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Old 26-01-2011, 09:47   #554
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25th Jan.

At the beginning of the log the audio was too loud. Then around 20 UTC I noticed silence and checked what had happened. There was a mixture of a 1000 Hz tone and audio, but the level was -50 dB so practically nothing could be heard, less understood. Then finally around 2025 the audio level was up above -20 dB in Dream. Far too loud! At 2105 a woman was talking but the audio spectrum was extremely narrow and the speech was extremely distorted.
An odd log altogether.

Oh yes, I forgot to say that the AIR Label was missing, and there was no "welcome" in the display.
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File Type: png 9950-110125-1747-2323-HED362@CH.png (43.4 KB, 60 views)
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Last edited by Digger : 26-01-2011 at 09:56. Reason: And - I forgot...
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Old 26-01-2011, 19:38   #555
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Back to 11 kbps and normal sound level, but it did not last very long before something went wrong somewhere.
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