View Full Version : 9950 kHz AIR India Tests to Europe from Khampur
Strong and stable signal, sound not too bad (hum-wise), 11.62 kbps and more or less the same SNR :rolleyes:
Good reception, low bitrate, one break was caused by my lame laptop. :rolleyes:
A 40 minutes log with a very good result. The sound was not very fantastic, but still possible to listen to. Text message: "welcome". (Thank you).
mitajohn
21-10-2010, 23:44
Hi all,
Good reception tonight. A 100mins result.
No "welcome" this evening, and no label. It wasn't missing; there was none. Terrible sound quality for the configuration. It sounded like the hum level was just 15 dB below the audio. :eek:
The "welcome" was back today! But the reception in Switzerland is not as good as up in Stockholm. And the sound is not "near FM quality"..... (MP3 was not a valid file format :eek: )
Well, nothing fell down here. The mirror in the sky was on holiday... :rolleyes:
Good-bye Summer....
The welcome was back tonight. I misunderstood the schedule, so my log stopped premature... :rolleyes:
Yesterday 25 dB SNR, today the AVERAGE was 10.8 dB. Max. SNR was 11.6 dB! Wow. During 146 minutes. And last but not least: The Decoded Audio was - about 97% :rolleyes: :cool: :eek: :confused:
Heavens above! Today the max. SNR peaked at 32 dB in this 144 minutes long (unattended :rolleyes: ) log! But dreadful audio quality... DRM: Digital Rumble Mumble ®
mvs sarma
05-11-2010, 01:47
Heavens above! Today the max. SNR peaked at 32 dB in this 144 minutes long (unattended :rolleyes: ) log! But dreadful audio quality... DRM: Digital Rumble Mumble ®
I hope, that drmrx.org/forum moderator may have to forward few comments to air by mail or some arrangement as i fear that they did not know that is site helps them improve quality.
I have a doubt that AIR has copper wire end link from the Studio to Tx site and this cable has been causing the 50Hz induction or its harmonics that fall in the audio band.
Once they know, I am sure that they keep an engineer to monitor the comments on this forum for their advantage.
Funny re- definition of D R M !!!!!
I have restarted my DRM Toys... ;)
Short view to AIR.
30Min. with stable decoding today.
mitajohn
07-11-2010, 21:54
Hi all,
Here's an unattended log for 4H27.
@Andy: Welcome back!
This is a trial run with a different 12 kHz mixer and my RF-B60 (tuning up for my Japan trip).
FritzWue
12-11-2010, 19:25
No label, no ID, no text.
Audio quality low,
compressor pulls up loud hum without audio,
15 kbps robust mode would match and give much more CDA,
clock 22 minutes late.
Guess what a listener's impression is.
... and the usual hum and distortion... The log tonight was not very good. The wiggles in the SNR confuses me. Need to look into that. I haven't decided yet which receiver to drag with me to Japan, this one or the Roadstar.
FritzWue
13-11-2010, 21:06
This time:
Label OK, still no ID, text OK :)
11.5 kbps robust mode gives ~100% audio.
BUT: Why only 11.5 kbps?
This does not match the audio quality that was optimized for AM!
AM audio usually goes up to ~4.5 kHz.
11.5 kbps reduces this to below 3.5 kHz.
Result: Worse audio than possible.
@AIR: Please test something around 15 kbps. This would match best.
Thank you.
Hallo All,
Results for today.
Kind regards.
Jos.
FritzWue
14-11-2010, 18:06
Tonight again with 21 kbps, but the audio source is only abt. max. 5 kHz.
Something around 15 kbps would be the optimum. :rolleyes:
The clock is running with wrong date and late.
This evening I got similar results from both receivers (FRG-7700 and RF-B60). The RF-B60 performed a bit worse with 95% CDA vs. the FRG-7700 with 98%. I think I have made up my mind what to drag to Japan...
mvs sarma
16-11-2010, 01:54
This evening I got similar results from both receivers (FRG-7700 and RF-B60). The RF-B60 performed a bit worse with 95% CDA vs. the FRG-7700 with 98%. I think I have made up my mind what to drag to Japan...
but i don't expect this signal to be available at Japan. what mod you did for the RFB60 for getting 12KHz output.
i feel that the ceramic filters to be changed to make it broadband
what mod you did for the RFB60 for getting 12KHz output
Hi,
I pick up the signal *before* the ceramic filter. You are right, it is too narrow for DRM. Here is the "old" modification (I'll present a simpler one based on Toshiba's TA7310 soon): http://www.omnirep.se/drm/nationalrfb60.html#2xtal
Today AIR spent 7 minutes at the beginning to DRM, but there was no content. After that and until I stopped my log there was only AM on the frequeny (with hum, of course :rolleyes: ).
A 155 minutes log with 99.4% decoded audio. I modified the DX/LOC switch in the RF-B60, so I get 10 dB attenuation in LOC instead of 28 dB. However, the max. SNR this evening was not very impressing.
mvs sarma
19-11-2010, 04:11
A 155 minutes log with 99.4% decoded audio. I modified the DX/LOC switch in the RF-B60, so I get 10 dB attenuation in LOC instead of 28 dB. However, the max. SNR this evening was not very impressing.
Perhaps a slower AGC by a mod of agc related section could improve the performance in a Receiver like RF B60 for use of DRM signal.
Very good reception in Northeast France from HPT AIR KHAMPUR of 9950 Khz, I remarque no ID : number !!!
FritzWue
19-11-2010, 18:41
Ridiculous audio "quality", agc problems, certainly no medal for AIR:
FritzWue
19-11-2010, 19:32
...still listening, now the rf signal is also totally distorted. :mad:
mitajohn
19-11-2010, 20:09
Hi all,
An unattended log. No clue what happened at 20:19, local problem ?.
Glad to see the above comments, as I wondered too what had happened. Unlike Brendan, I have no cat that operates the UPS here, but for some reason the receiver was off when I came back down. Perhaps I had pushed the "sleep" button by mistake. Then I noticed the much lower SNR when I switched on again and suspected my 12 kHz converter, but fortunately it was the TX that had gone bad. :rolleyes:
@Fritz: Yeah, that sound. :confused: :confused: :confused:
mitajohn
20-11-2010, 12:52
Hmm.....I suspected my set-up....
I wonder if they transmit DRM with AM at the same time just now?! (2105 UTC)
Better this evening. A 173 minutes log with 99.3% CDA.
Back to 11.56 kbps, but from 20 UTC things improved. Propagation wasn't the best at the beginning.
mvs sarma
27-11-2010, 02:47
I call am requesting a feed back from any Indian member, whether the 9950 signal is received in southern parts of India. I was able to get the signal earlier. I presume that AIR has tuned their antenna so well that the back Lobe signal or any side lobe are minimized.
mitajohn
27-11-2010, 18:14
Hi all,
A 30 mins log.
Perfect results (of the reception).
mvs sarma
28-11-2010, 04:38
@Digger and Mitajohn,
How is the Audio HUM?
@Digger and Mitajohn,
How is the Audio HUM?
Oh, yes, the hum is alive and kicking, but mostly when there is no audio. But this evening the reception was kinda OK. The log was unattended, as I was not home.
FritzWue
10-12-2010, 19:31
China, Portugal etc. have much better audio quality......in wide AM! :mad:
FritzWue
13-12-2010, 20:29
Ahlen-B58-A1-A43-B525-Gescher
mvs sarma
15-12-2010, 12:35
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
mitajohn
17-12-2010, 20:40
Hi all,
A mostly unattended log. Overmodulated bad audio + hum.
FritzWue
01-01-2011, 19:05
Haha, laughing all the time when listening to AIR in DRM. :D
See:
http://blogs.rnw.nl/medianetwork/all-india-radiodoodarshan-urgently-need-more-trained-technical-staff
Someone should tell them what all those little knobs are made for. :D
Zipped mp3 sample of tonight's excellent fm like audio quality attached. :rolleyes:
Must download, unzip, and listen! :D :D :D
mvs sarma
02-01-2011, 17:57
Haha, laughing all the time when listening to AIR in DRM. :D
See:
http://blogs.rnw.nl/medianetwork/all-india-radiodoodarshan-urgently-need-more-trained-technical-staff
Someone should tell them what all those little knobs are made for. :D
Zipped mp3 sample of tonight's excellent fm like audio quality attached. :rolleyes:
Must download, unzip, and listen! :D :D :D
P A I N F U L L........
It makes me nostalgic,when i was younger with my portable cassette recorder and a two transistor FM transmitter making radio for the neighbors.;)
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??
:confused:
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.
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
FritzWue
16-01-2011, 20:49
Good rf signal, bad audio:
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. :p
PS: I watched a Bollywood production on my return with SWISS back to Zürich 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? :D
FritzWue
20-01-2011, 21:12
Terrible audio, even worse rf signal:
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. :rolleyes:
:eek: 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.
Back to 11 kbps and normal sound level, but it did not last very long before something went wrong somewhere. :confused:
Sometimes the signal was too weak to get any decoded audio. >99% decoded audio from 1830 and on.
FritzWue
01-02-2011, 21:02
Signal OK, audio "excellent" as always! :rolleyes:
An unattended log. The same segment compared to Fritz's. Similar results, but the period of unstable reception is not the same. However, the sound was probably much the same regardless of the location. :rolleyes:
The second log is the complete log with 82% decoded audio. The signal usually gets rather weak here around 20 UTC.
"Excellent" audio in the beginning, then less excellent propagation. :eek:
FritzWue
03-02-2011, 20:37
Very bad propagation or reduced power tonight:
An unattended log. More or less the same pattern here!
Surprise! 99.95% decoded audio tonight. The audio level was mostly acceptable. An almost unattended log.
The conditions seem not so good this evening. A was 13 - might have been a factor.
Better this evening with SF:90, A:5 and K:1. The signal was generally stronger tonight. I was testing new ideas in the Plotter, so the log shut down automatically, as intended at 21 UTC.
mitajohn
08-02-2011, 21:58
Hi all,
Almost perfect results for 104 mins.
175 minutes and then I switched over to watch another channel. 97.5% CDA and poor sound quality with severe hum at times. No wonder the text message reads "drm training sti". However, I can't figure out the meaning of "sti".
mvs sarma
11-02-2011, 03:24
175 minutes and then I switched over to watch another channel. 97.5% CDA and poor sound quality with severe hum at times. No wonder the text message reads "drm training sti". However, I can't figure out the meaning of "sti".
Hi Terje,
the HUM at times, if you analyze, it would be predominant when an announcer comes and minimal when the tape or record is being played back. Just see, how far my logic is correct.
Perhaps they need replace the power line filters and the caps across diodes as we identified as source of noise during last year even for our own power supplies. I only fear whether AIR is using SMPS in some of their studio consoles and mixer units. If so, perhaps it is time that they should attend to them or replace them with better and tested ones.
STI is Staff Training Institute(Technical). They should not have abbreviated that with small letters, that too on their Foreign service frequency. the link is here.
http://stitairdd.org/ (STI T AIR DD)
DD stands for DoorDarsan a word in Hindi used for television.
All the best.
Hi Sarma,
Thanks for your explanation of the text. The hum is as you say only present during periods without speech or music. Perhaps it is an audio compression issue?
Anyway, that is for AIR to resolve. Last night's transmission was plagued with hum again.
mvs sarma
13-02-2011, 16:51
Hi Sarma,
Thanks for your explanation of the text. The hum is as you say only present during periods without speech or music. Perhaps it is an audio compression issue?
Anyway, that is for AIR to resolve. Last night's transmission was plagued with hum again.
In fact it would be there all the time, but while voice or music takes over, the hum subsides.
The action comparable to Automatic Level control (ALC) in tape recording.
many experts they switch off the ALC for professional quality recording.
In the AIR HUM issue, I seriously feel that it is due to power supplies they use in their studio consoles and the Mic used by the announcer.
I had tried to bring to notice of one person through email, and hope they get the issue resolved shortly.
all the best
I am not sure when AIR started broadcasting last night, but here are 147 minutes up until the end. The log was unattended.
One dropout *might* have had a connection with the Solar Flare, but not for sure. No audio during the last 15 minutes. The log was mostly unattended.
A four hours log, at times with a weak RF signal. 90.6% decoded audio.
Quite good results tonight.
Simone
More or less the same result here as in Simone's log during the same segment. The dip at 1956 seems to be TX related, as it can be seen in both logs.
However, after 2110 UTC the propagation worsened.
An unattended log. The SNR never recovered after the one minute TX break at 1901 UTC.
It started out well but I cut off the log around 2010 UTC as the decoded audio was just under 50%. The signal was around +20 dBµV or less at that time.
After 77 minutes and 88% decoded audio the transmitter seems to have (been) shut down. :confused:
Much better conditions last night. The log was unattended.
Back to "normal" conditions and about 90% decoded audio.
Very good up until 2045 UTC, then a period with weak signal. The last half hour from 2200 until the end was OK.
FritzWue
02-03-2011, 20:26
Weak signal tonight:
No use with SF:113 (now) and A:25 (earlier).
Almost perfect reception in this partly unattended log. Every time I checked, the S-Meter was nailed in the same position.
A mostly unattended log except for the six times I looked at the S-Meter. About 92% decoded audio over the 242 minutes I logged.
A mostly unattended log except for the five times I looked at the S-Meter and the last 40 minutes. About 99.8% decoded audio over the 207 minutes I logged. Very stable reception tonight.
A mostly unattended log except for the five times I looked at the S-Meter and then I forgot about the rest. :rolleyes:
Except for a short period with a weaker signal the rest was more or less perfect. The 208 minutes long log was mostly unattended.
mitajohn
09-03-2011, 19:53
Hi all,
An unattended log with almost perfect results.
Two and a half hours of almost perfect reception. Only if they could fix the awful audio?
Two labels tonight: AIR HPT KHAMPUR English and AIR HPT NEWS Hindi, but the same programme in both. The last part was unattended, therefore the RF signal levels for that part is missing. 19.98 kbps, but unfortunately, it did not help the audio any.
Good reception until the ionosphere gave up around 2115 UTC. An interesting new label this evening: "hindi" and A/10 kHz with 11.00 kbps. Sometimes the female commentator was barely audible. Sounded that they had not twisted the wires tight enough. :rolleyes:
PS: Got the antenna wrong... It was the Active Antenna 70 cm.
Not very exiting contents this evening. The "programme" mostly consisted of a 1000 Hz tone all evening. :confused:
Not very exiting contents this evening. The "programme" consisted of nothing at all all evening. Not even hum! :rolleyes:
But the reception as such was not bad at all... >99% of - silence...
mvs sarma
19-03-2011, 02:08
Not very exiting contents this evening. The "programme" consisted of nothing at all all evening. Not even hum! :rolleyes:
But the reception as such was not bad at all... >99% of - silence...
At last hum compromised at no signal. The Transmitter is proven with this.
I presume that the hum was due to prerecorded tapes which were from library and they contain hum. As the content is pre-recorded, they have to use a notch at 300hz or so but it may not be effective.
AM this evening... at least at 1905 UTC
Although a segment from 2040-2045 indicates 50% decoded audio, a recording that I made showed no sign of modulation. No hum either, which makes me believe that there was no programme on the air. The log was unattended.
A solar flare about C4 might be the reason for the disturbance at the beginning of the log. The rest was very good until 2213, when some dropouts can be seen again. There was audio today.
Higher bitrate, more dropouts in this un-attended log. There was audio in this transmission. There was no label.
Higher bitrate, more dropouts in this unattended log. There was audio in this transmission. There was no label.
The signal seemed a lot weaker last night which can be clearly seen in the log. The curves are all over the place. With 53.5% decoded audio it was not much of a listening pleasure.
mitajohn
24-03-2011, 21:42
Hi all,
Good reception and good results. Some minor dropouts.
I don't understand this transmitter - or the perhaps the people behind the levers. Last night the signal was very strong and stable. The night before it was very weak all the time during the evening. Yesterday the SNR was much higher than usual.
Although there were 26 minor dropouts in the audio, it did not affect the decoding much. 99.97% decoded audio. Only problem: My brain is not able to decode the programme 100%. Another challenge for Google !!
mitajohn
25-03-2011, 20:41
Hi all,
A 42 mins result. Nearly perfect.
The entire 4.75 hours with perfect (almost!) reception.
FritzWue
26-03-2011, 21:14
Only hum most of the time and then the signal looked very strange. :(
I noted the hum when I listened for a short while in the beginning. The rest was unattended. I wonder what happened around 2143 UTC?! :confused:
FritzWue
27-03-2011, 12:18
I wonder what happened around 2143 UTC?! :confused:
That buzzing oth radar started exactly centered on frequency. :mad:
@ FritzWue: R, explains everything...
Not perfect reception, but good. Never mind the sound quality - still sounds like shielded cables were never invented. :rolleyes:
Higher bitrate tonight, "glassy" sound. Lower than usual SNR. A break from around 2037-2108. Then suddenly 28 dB SNR for about 10 minutes, a break again and back to 15 dB SNR for the rest of the transmission. A mostly unattended log.
A mostly unattended log. Except for the small ripples the reception was perfect. Those small dips did not cause dropouts. Remarkably higher SNR this evening.
mitajohn
31-03-2011, 19:59
Hi all,
An unattended log for 2H.
Judging from Mitajohn's log, the dip around 1800 UTC here must have been something local. The almost perfect log was unattended.
mitajohn
01-04-2011, 22:45
@Terje,
Judging from Mitajohn's log, the dip around 1800 UTC here must have been something local
No, not local. If you look closely at my log, there is a SNR dip at that time which affected a bit the decoding.
No, not local. If you look closely at my log, there is a SNR dip at that time...
OK, good to know. I thought it looked suspicious. To compensate for that small dip, they did a good job producing three giant dips in this log. I was present during the second dip and at that time the carrier was off the air.
An almost perfect log for 233 minutes. The Doppler curve suddenly rose to high levels around 20 UTC.
Higher bitrate tonight (3rd) in this unattended log. The signal was strong and decoding was perfect until around 2150 UTC. It looks like the signal strength took a blow during the last 40 minutes and in that segment the decoded audio was 88.88%. Up until that point it was 99.82%.
Lower bitrate again and virtually perfect.
Higher Bitrate and no label again. A bit more unstable. The log was unattended.
... and lower bitrate again this evening. Virtually perfect decoding. I stopped the log early this evening.
FritzWue
09-04-2011, 21:23
Testing the 65 Euro PappRadio:
Near perfect reception last night. Except for the hum...
A nearly perfect log. The log was unattended.
First nothing at all and then AM. Switched off at 1842 UTC :rolleyes:
Tonight I noticed an "interesting" phenomenon listening to the (weak tonight) 9950 kHz DRM signal with 20.96 kbps. Around 2045 UTC I noticed a DRM channel on 9.930 MHz and AIR in AM on an unlisted (A11) channel 9.940 MHz. It seems like the TX on 9.940 MHz causes a spurious signal on 9.930 MHz which can be seen with Dream in "flip input spectrum" mode. Could this be the reason for the weak 9950 kHz as well? :confused:
If I'm not mistaken I think I can hear the AM 10 kHz up superimposed on the 9950 kHz too. Now, at 2055 UTC the SNR on 9950 is around a meager 9 dB. The same SNR was recorded on the flip input spectrum 20 kHz below 9950 kHz.
A most puzzling configuration of transmissions. :rolleyes:
Btw, the reception this evening was very bad with SF:118 A:14 K:1 and SSN:153. But, the AM on 9.940 MHz was booming in. AIR: Comments please????
:confused: :eek:
Same crazy situation tonight as last night. It would be nice to get a second opinion from somewhere. :confused:
I messed up my settings and set the RX to the wrong frequency, that's why the log starts late. At least they did not operate their AM TX 10 kHz up, so the DRM signal came through much better. The log starts with three TX breaks, and about halfway through the transmission they switched to a lower bitrate. Unfortunately I did not set the screen-shot option, so I don't know whether it was their "normal" 10 kbps setting.
Unfortunately, the CDA in my log is wrong.
Tonight again I noticed the phenomenon listening to the (weak tonight) 9950 kHz DRM signal with 19.98 kbps. Around 1945 UTC I noticed a DRM channel on 9.930 MHz and AIR in AM on an unlisted (A11) channel 9.940 MHz. It seems like the TX on 9.940 MHz causes a spurious signal on 9.930 MHz which can be seen with Dream in "flip input spectrum" mode. Could this be the reason for the weak 9950 kHz as well? :confused: :confused: :confused:
Could anyone verify my suspicions? With AM from the same TX site (?) 10 kHz down from the DRM, something seems to interefere, probably intermodulation in the TX :confused: :confused: causing the DRM to stay around 10 dB SNR. This wont decode anything here.
A most peculiar behaviour of the AIR broadcasting engineers... :eek: I'll post my log tomorrow. (And the log will be 100% unattended...) :rolleyes:
No AIR in AM up 10 kHz tonight (18th) but the higher bitrate did not help the reception. When I listened in the beginning until 1810 UTC, there were several TX breaks. The rest was unattended. 83.7% audio is not enough to make anyone happy.
A short TX break at the very beginning of the log and another TX break for about a minute around 1817 UTC ruined the 100% decoded audio. Otherwise the reception was very good.
Almost perfect decoding with 11.56 kbps. How about trying something like 14 kbps?
Almost perfect decoding with 11.56 kbps. How about trying something like 14 kbps?
mitajohn
26-04-2011, 22:19
Hi all,
An unattended log.
A mostly unattended log except for the first 40 minutes. Low SNR but a strong RF signal, about +50 dBuV into my receiver. Almost 100% audio decoding.
It started out with a strong signal and quite high SNR. Later I noticed a TX failure or some other problem and the SNR was down compared to the first part. The reception also became rather unstable. :confused:
Still I wonder: Couldn't they try a configuration with 14 kbps and better audio?
The first 5 minutes were good, the rest no success. I am not sure whether the laptop is the source of the trouble.
Not so good here this evening.
A PC hang cut the log short.
A new configuration at last from AIR? At least today was the first time I saw 14 kbps (and Mode A).
A different configuration with a wider audio spectrum but 750 frames. Now we need to get a better signal into Sweden, then we will be even more happy. And the hum we could do without, too.
A rather short log, because the signal faded out on me.
The signal became stronger later in the evening. I switched over to battery power supply and the laptop shut down at 2130. An unattended log.
There were obviously some problems with the TX last night.
Back in Switzerland. Perfect reception with the 14.32 kbps configuration. I wonder why the Doppler values are so high sometimes? :confused:
Tonight the bitrate was 14.04 kbps. Perfect reception for 73 minutes until sign-off.
FritzWue
18-07-2011, 22:39
Good reception, audio level too high and quality low.
Had 3dB more SNR with the quadloop than with the dipole.
petecchiaro
24-07-2011, 19:19
pretty good reception, sometime audio goes away even if receprion os Ok.
attached 26min log
petecchiaro
27-07-2011, 19:22
tonight excellent reception even if during a big storm.
attached 13min log
Excellent reception in AM at 2035 UTC up 60° North. :eek:
100% perfect from 1807 UTC tonight. Before that there was a TX break for about 4 minutes. Come to think of it, there is no hum any longer (?).
Rather good reception here in Stockholm despite the high Bitrate. I noticed one longer TX break (no carrier).
Even higher bitrate this evening, but still 99.9% CDA. The sound quality is not the best. A mostly unattended log because of visitors here.
A short log, starting in Mode A and 14.04 kbps, then they changed to Mode B and 20.84 kbps.
FritzWue
21-08-2011, 22:32
20.84 kbps now, but these sneakers got no audio at all tonight! :eek:
Still 20.84 kbps, and with sound. Quite good reception here, according to the log. It was unattended.
A 286 minutes long log from yesterday evening. About 97% CDA.
mitajohn
23-09-2011, 21:44
An unattended log.
Very good reception in Switzerland. The audio was limited to around 4000 Hz. 14.04 kbps with AAC (without "+").
petecchiaro
25-09-2011, 19:02
Excellent! good propagation audio quality OK.
Attached 20 min log :)
Perfect reception during the last 97 minutes of the transmission. :)
However, the audio was limited to about 4000 Hz.
With A:27 and K:6 it was a small wonder that it was possible to hear anything. :eek:
A note to AIR: Did you see this log?
Much better conditions now when the Ionosphere has calmed down a bit. Perfect reception in this 188 minutes long log. :) :)
Mode A and 14.04 kbps worked wonders.
mitajohn
29-09-2011, 20:31
An 100mins log. Except of a period of bad results the rest log was almost perfect. The SNR sometimes reached 30 dBs.
There was no DRM the day before yesterday. First DRM without any sound and low SNR, then soon after AIR switched to AM mode.
Yesterday I got the enclosed result. 99.84% audio in the same segment as Mitajohn's and 97.98% CDA for the 282 minutes I logged.
Except for the 32 seconds with no audio, the rest of this 289 minutes long log was more or less perfect. :)
Almost perfect except during the last 40 minutes.
Almost perfect reception. I started the log automatically and a bit early, therefore I missed the Label.
There was a major Audio drop-out for 43 seconds from 20:12:26 UTC and a few minor ones too.
No Audio, only silence, therefore only a short log.
A mostly unattended log. The sound I heard was sometimes good, sometimes extremely low level (not possible to hear, almost) and then again full blast. One positive thing: The aggressive hum seems to be gone.
Except for the 1.5 min TX break at 22 UTC the reception was great. When I listened in the beginning of the log, the sound level was extremely low. I could hardly hear anything at all.
A 284 minutes long log with a total of 99.8% CDA, including a major Audio drop-out for 4 minutes and 52 seconds from 18:44:25 UTC.
After having waited for 205 minutes after 1800 UTC I gave up. AM all the time.
:(
FritzWue
09-10-2011, 20:26
Good reception:
I was late starting the log. Yes, very good reception, indeed.
Short log tonight. Too many TX failures!
FritzWue
11-10-2011, 20:12
My log started later, so I obviously missed these TX failures.
AIR DRM has improved a lot, but would be much better if the audio source would be hifi and not pretreated for AM modulation.
On my panadapter screenshot VoR and RNZI are visible to the left.
It started with several TX breaks. My log starts with the return of the TX carrier around 1814 UTC. Then followed two more TX failures one about 30 seconds and one for three minutes. Then there was a 6 minutes period with no audio. After that everything seemed OK.
A test log on my new, low-cost HP Pavilion g6 Laptop.
Fantastic signal from AIR . Super propagation for DRM .log 56min.
Very good reception in Switzerland too.
Good reception, but there were multiple TX problems, especially towards the end.
100 Hz hum with some audio underneath for 155 minutes until I switched off. I thought AIR had gotten rid of these problems? :confused: Some audio failures around 1950 and 1953, otherwise the decoding was perfect.
Very strong signal from AIR. Log 58min.
An almost perfect log from AIR. The audio is limited to about 4000 Hz without AAC"+".
Very stablie signal from AIR. Log 52min.
Quite stable signal here in Stockholm. There seems to have been a five minutes long TX break from around 2049 UTC. Most of the log was unattended.
FritzWue
31-10-2011, 19:47
Indian folk music in hifi quality. :rolleyes:
Judging from Fritz's mp3 file, he must have enjoyed the same programme as I did. This evening there was music with some hum, the programme "Faithfully yours", hum with some modulation and hum with hum. However the decoding of this was perfect for 260 minutes. :rolleyes:
Sorry folks, this must be a joke?? Aggressive hum - impossible to listen to. :mad:
99.94% CDA until the signal disappeared at 20 UTC. :confused:
This evening the signal disappeared at 1830 UTC. At 2040 UTC I tuned in again and AIR was on air. The second part was perfect.
99% CDA in this unattended 158 minutes long log.
FritzWue
14-11-2011, 19:11
14.NOV.2011 - 20:05 UTC
SNR only 22 dB with signal S9 +20dB
Noisefloor visible +/- 40 kHz
Audio ~20dB too high/ clipped
EDIT: Date corrected, thanks Terje. :)
Here is my log for 14th Nov. 2011: The reception was not very good, so I stopped the log early.
Tonight I think the sound was extra miserable. The reception wasn't the very best either.
Today the RECEPTION was miserable. :confused:
Strong signal this evning in Sweden .
The result here was not very encouraging.
The same feeling tonight as last night. Not very good.
Odd propagation conditions from India lately. :confused:
>99% CDA for 77 minutes from 2045 UTC. The reception before that was not so good.
Only about 15% CDA tonight. :rolleyes:
Even less this evening than in my last log. There was some audio at the beginning but the level was surely 30 dB too high and the sound quality was horrible - is there noone around to check the state of the transmission?? :rolleyes:
Not much at all last night. The log was unattended.
About one hour worth of logging. After 2015 there was no signal to talk about left. The SNR peaked at 22.89 dB around 2030.
The pattern of tonight's log was sort of the inverted of last night's log. :rolleyes:
Perfect, then it just went up in thin air (?) - or thin ionosphere?
FritzWue
13-12-2011, 19:20
Bad audio quality, not sufficient for DRM.
mvs sarma
14-12-2011, 03:42
Bad audio quality, not sufficient for DRM.
Sounded like a clipped or 0.3KHz to 3KHz filtered audio.
A sight for sore eyes... or the same for sore ears... The audio level is *far* *too* *high* and the result is terribly distorted sound. :eek:
- Sound quality (mostly only distortion) :rolleyes:
- aac (AAC+ would be better - if the audio source allows) ;)
+ Strong signal tonight (antenna related? Propagation?)
Only the technicians at AIR would know. :confused:
+ High SNR, 24 dB max on my Roadstar which never
produced anything above 25 dB or thereabout. :)
Almost perfect receiving conditions for 102 minutes from 2048 UTC. But, the audio level is still *too* high. The SNR peaked at 24.61 dB on my mean Roadstar just a few minutes before close-down.
Someone must have adjusted the audio level at last, but unfortunately in the wrong direction. Today it was even louder than last night. :confused:
The propagation was a bit similar to yesterday, best at the end.
Short log. 100 % stable reception.
Arrrgh, sorry AIR folks, is there no-one around who could adjust the input level of the audio source??? It sounds - awful!
They found the audio level button! Tonight the sound was pleasant but limited to 4000 Hz (no SBR). Then I forgot to turn off an LED lamp, so the power supply (made in - China, of course) blanketed the 9 MHz band with a buzz until 2046 when I realized it was on. From that point the decoding improved a lot. That switched power supply (without earth) sits in the same socket as the 15 Volt DC power supply (with earth) that I use to feed the Roadstar, the Active Antenna and the HP Laptop. On top of everything Dream froze just before the end of the transmission. Grrr...
Yet another configuration with 13.96 kbps and aac+, but the conditions marred the reception. The audio level was the same as yesterday.
Once again the same configuration but with far too high input level so the audio was clipped and distorted - and loud! The RF signal faded towards the end and I just managed to increase the receiver RF AF Gain which made an improvement at the very end of the log.
14.04 kbps and aac tonight *AND* the audio level was OK, which improved the sound immensely. The weak part is lack of signal; there is a period of almost complete absence of a signal. Definitely a propagation issue.
No weak period (at least not this evening) here in Switzerland. Perfect reception in this mostly unattended log.
3 h 20 min perfect reception from the start, but then the conditions became unstable. The log is 254 minutes long and the max. SNR was 24.17 dB at 19:09 UTC. The higher bitrate used this evening could have been a reason for the result.
128 minutes of almost perfect reception, but the sound quality needs to be better.
Looks like the "Sweden Syndrome" has arrived in Switzerland too... A "hole in the middle". And please AIR, do something about the sound level and ditto quality. I could hardly understand anything during the "Sincerely yours" programme because of distortion! :eek:
Audio level was still too high, but less distortion last night.
Lots of TX failures last night.
An unattended log for 3 h 37 min. A weak period around 1945 UTC caused the overall decoded audio to around 95%.
I was not at home, so I cannot comment on tonight's log. There seems to have been a TX problem (or propagation problem) for a while around 1920 UTC.
It seems like there is a propagation issue in the beginning of the transmission. Last night it started out as "VIVIDH BHARTI" with 14.12 kbps and AAC (Vividh Bharati? - Bharat=India? My knowledge of Hindi is a bit rusty - hi).
When the signal came back later it was "GOS IV" (General Overseas Service Number Four?) with 20.88 kbps and AAC+, but the audio spectrum was limited to about 5000 Hz plus distortion, as the input level was too high.
mvs sarma
11-01-2012, 08:18
It seems like there is a propagation issue in the beginning of the transmission. Last night it started out as "VIVIDH BHARTI" with 14.12 kbps and AAC (Vividh Bharati? - Bharat=India? My knowledge of Hindi is a bit rusty - hi).
When the signal came back later it was "GOS IV" (General Overseas Service Number Four?) with 20.88 kbps and AAC+, but the audio spectrum was limited to about 5000 Hz plus distortion, as the input level was too high.Hi,
Nice analysis of Bharat being India. long back a king called Bharat ruled the subcontinent. Thus India is also called Bharat
Vividh is various bharati means "of Bharat (India)". in fact pronounced as Bhaarat.
The program is film and other musical. Being a multi-lingual nation, the Vividh indicated the various regions and languages of songs and music, belong to .
You are right. GOS iv is general overseas service channel iv
Finally Multi lingual program of Indian songs and music is Vividh bhaarati.
thanks for the interest shown. Fear i did not prolong too much.
Hi Sarma and all,
Thank you for the explanation from yesterday. Last night's reception was down to less than 65% CDA - from 2050 and on the reception was more or less perfect. The label was GOS IV during the whole transmission last night.
Just about 50% CDA last night. It looks like the transmitter was off air for a while around 19 UTC.
About 65% decoded audio, a step up from my previous log. I don't understand why my HP Pavilion logs tend to "loose" 1 minute per 60 minutes logging? The log ended at 2330 (system clock, UTC+1), but the csv file entry at that time was 2226, four minutes short in this 4h 31 min log. A mystery.
28% CDA for the first 135 minutes. Then perfect reception during the last 90 minutes.
Good reception from 21 UTC and on.
I started the log late tonight. That's why it looks so good. Here are the almost perfect last 35 minutes. There were a few "bonus" minutes with a 1000 Hz tone - too high level that can be seen from several harmonics in the GIF screen shot. Further, it seems to be a common problem that the calendar runs fast but the time in UTC is correct. At least it is still Thursday in UTC at the end of the transmission. :confused:
PS: This is my post #6178. If I had logged this from Switzerland it would have been 6178 km to the TX. Magic numbers... or something...
First rather miserable conditions and then without me noticing, Dream gave up and froze. The second log up until the end resulted in around 90 % CDA.
FritzWue
25-01-2012, 19:38
Weak signal tonight, has probably something to do with the sun's activity.
The little audio decoded was good in quality today.
Did not listen for some time, the label is new to me.
mvs sarma
25-01-2012, 19:55
GOS IV means General overseas service IV from AIR Khampur, Delhi
FritzWue
26-01-2012, 20:06
GOS IV means General overseas service IV from AIR Khampur, Delhi
Sarma,
thank you for clearing this puzzle.
Today much better reception.
The audio is much better than it used to be, even a little better than AM.
But still 21 kbps is much too high for mono audio peaking 6 kHz.
Something around 17 kbps or a better audio feed should be more adequate.
FritzWue
27-01-2012, 20:05
Again a different label today: VIVIDH BHARTI
Wikipedia says it means something like Multi-Indian Service.
Sarma, is this correct?
A partly unattended log, I missed the two big dropouts.
Sarma gave an explanation to "VIVIDH BHARTI" in post #726.
This morning in Japan, like last time I was here, AIR popped up around 07 JST. The log is not that fantastic, but I have a lot of birdies and whistling noises here in many bands and 9.9 MHz in particular.
At 0701 JST the signal suddenly popped uo out of the blue, but this morning it was too weak. -5°C outside and +6° inside. It is winter in Japan, even on the Pacific coast :eek:
FritzWue
30-01-2012, 18:48
Good reception during the first hour, then the signal suddenly got very weak to undetectable and later came back as unmodulated carrier.
To me it looks like there is something wrong in the programming of the switching matrix.
The IMD was also relatively high.
FritzWue
31-01-2012, 21:43
Today I was late.
Just when I started listening at 18:31 UTC the signal disappeared.
It came back some minutes later better than ever before. :)
Low IMD, high SNR all the time, very good! :)
Two things to improve:
1. AAC+ as coder is clearly visible, but the audio feed quality is only for AM and too bad.
The frequency response is missing higher frequencies.
2. The clock is over one minute late. :rolleyes:
This morning the local sunrise was at 0746 (UTC+9). I have no idea if this has anything to do with the reception of AIR. Anyway, the signal suddenly appeared just around sunrise.
PS: The little audio I heard I thought sounded very shrill.
FritzWue
01-02-2012, 19:43
Very good rf signal into europe. Have not enough time tonight.
With a better audio feed this signal could be a DRM reference. :)
Miserable conditions here in Japan this morning. :(
The signal suddenly popped up at 0700 JST. A little bit of audio this morning. The plasma TV downstairs probably added to the poor reception.
FritzWue
03-02-2012, 20:59
A mixed result:
All I heard was a comment on Syria, then the audio vanished.
FritzWue
06-02-2012, 18:24
Not worth listening tonight, totally overmodulated, audio level far too high. :mad:
Some audio decoded from VIVIDH BHARTI this morning in Japan.
GOS IV with a very weak signal.
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