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Old 2009-06-17, 03:39   #151
zfyoung
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Quote:
Originally Posted by DRM-OM

the main point of concern isn't the size of the coverage area, but
is the very significant difference between daytime and nighttime coverage area

UnQote


Does anyone know where to find the recorded IF signal of the 'problematic' night time receptions mentioned in the BBC DRM trial?

I think difference between daytime and nighttime coverage is inevitable, but I don't think their difference is THAT significant esp. in target zone because I doubt their software is optimised enough for the most difficult senario.
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Any kind of audio drop-out is worse than any kind of low quality audio: No audio, No log report.

My Rx location: GuangXi Province @ E106°36′ N23°55′

Last edited by zfyoung : 2009-06-17 at 03:42.
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Old 2009-06-17, 10:31   #152
maxpower
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Hello People!

I don't think it's worth to discuss with him anymore. He only wants to complain.

He complains that Air India would be unm´listenable while others have no problems with listening to the programming. Look at this example:

Reception Air India, last days:

Quote:
Originally Posted by DRM-OM
at this moment totally useless.
Will post log this night - wondering if it will improve

Quote:
Originally Posted by Digger
Almost perfect reception with >99 % CDA. Some glitches in the AF, otherwise fine.


Quote:
Originally Posted by DRM-OM
Totally useless here, not able to follow the news or anything.
(btw.: break after 21:05 was caused by me looking for AM alternatives)

Quote:
Originally Posted by Simone
Perfect reception here.
Simone

Quote:
Originally Posted by Digger
99% CDA here on my portable setup, which I think is pretty good. Two significant breaks were caused by my laptop.

Quote:
Originally Posted by DRM-OM
again useless.

Quote:
Originally Posted by DRM-OM
useless, even worse than yesterday ...
...

He complains about 1296 kHz while others have no problems with that:

http://www.drmrx.org/forum/showthrea...t=1143&page=98

And he thinks that this forum has no propose anymore because he "doesn't find any feedback"

http://www.drmrx.org/forum/showthrea...6337#post56337

So either his "2 Year Holiday" was very bad or he has just gone an embittered old man who wants to complain in order to complain.
I don't know but for sure he doesn't want to get better reception, he wants to continue complaining.
I've better things to do, so I wont discuss with him anymore.

Stephan
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Old 2009-06-17, 12:26   #153
Roy Sandgren
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Longwave and lowfer end of mediumwave have the best groundwave day and nigth, hardly no fading during dark hours.
Of course, best drm is in the 26 MHz if the antenna is a anti skywave.
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Old 2009-06-17, 21:21   #154
DRM-OM
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Quote:
Originally Posted by zfyoung
but I don't think their difference is THAT significant esp. in target zone

Just look at the maps published in above linked doc. (page 10 and 11)
Nighttime is roughly 1/3 of daytime - diameter of reception zone wise.
AM is plotted on page 9 with comment in the text:
Quote:
whilst the night‐time coverage of DRM is greater than the equivalent ‘clean’
AM coverage, it is apparent that the technical limit of AM coverage is not the same
as the limit at which listeners will stop listening to it. Thus, listeners will tolerate
much more cross‐talk from interfering sources than is catered for in international
planning standards,

Just read the document, I will not post my personal oppinion here.
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some german language info pages on DRM

Last edited by DRM-OM : 2009-06-17 at 21:25.
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Old 2009-06-17, 21:39   #155
DRM-OM
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Generally I don't think that it is wise to fight a war of words in a forum but certain people seem to like personal attacks.
Forum users might be interested in the behaviour of this person in this discussion - no proven technical arguments, but lots of attacks.
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some german language info pages on DRM

Last edited by DRM-OM : 2009-06-18 at 05:27. Reason: corrected the link
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Old 2009-06-18, 03:47   #156
zfyoung
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Quote:
Originally Posted by DRM-OM
Just look at the maps published in above linked doc. (page 10 and 11)
Nighttime is roughly 1/3 of daytime - diameter of reception zone wise.
AM is plotted on page 9 with comment in the text:


Just read the document, I will not post my personal oppinion here.


Hi, Bernhard. I'd read that document before I posted the last comment. And what I really mean is 'what if their DRM software decoder is less than perfect, esp. in dealing with co-channel interference?' But of course, that is pure speculation only. For a final conclusion, I had to lay my hands on the actual recorded IF signal and see if I can extract some audio out of the supposedly 'bad' signal.


BTW,I found your experiment with 'co-channel interference to DRM signal' in the other thread is quite interesting. Would you just be kind enough to send me the recorded IF signal esp. the one with 'carrier at +10Hz from center'? because in the same thread, another forum member 'oh2bfo' verify your result and come up with a simple solution -notch filter. I'd like to give it a investigation. Thanks.
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My Rx location: GuangXi Province @ E106°36′ N23°55′
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Old 2009-06-18, 07:50   #157
DRM-OM
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Quote:
Originally Posted by zfyoung
Would you just be kind enough to send me the recorded IF signal esp. the one with 'carrier at +10Hz from center'?

Of course I can do that, but please be patient for a few days since I did the tests some time ago and have to redo them to record the IF files.
I have a few questions to that and would like to discuss this in the original thread to keep things together.
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some german language info pages on DRM

Last edited by DRM-OM : 2009-06-18 at 10:34.
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Old 2009-06-27, 19:42   #158
radiomann
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Replay Radio

Well i got a bit tired of waiting for DRM esspecially for Luxy, so i decided to start my own station with some ex 208 dj's coming soon, now is it worth going onto DRM????

Paul

www.replayradio.net
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Old 2009-06-27, 21:54   #159
Roy Sandgren
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Yap, get your own shortwave or mediumwave transmitter in drm.
Best of all is an analouge on mediumwave and a drm on shortwave.
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Old 2009-09-17, 13:36   #160
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Sept. 17

Hi all,

This may be is interesting: http://radiomagonline.com/digital_ra...profiles-0916/
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Old 2009-09-17, 14:16   #161
Roy Sandgren
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However, the number of recievers are increasing in the market. more and more buys a DRM reciever and the hours of daily broadcasting is increasing.
The future, DRM in 150 kHz - 27 MHz and DRM+ in band l, ll, lll and the L-band.
Thats what we need, nothing else.
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Old 2009-09-17, 20:19   #162
pb1
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At the IBC I have seen a demonstration of DRTV, TV via DRM. But at 8 frames a second, is it viable. I will upload some material later.
Attached Files
File Type: pdf drtv bw.pdf (55.5 KB, 519 views)

Last edited by pb1 : 2009-09-18 at 08:08. Reason: Attachment added
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Old 2009-09-22, 08:47   #163
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Sept. 22

Hi all,

I think this is encouraging: http://www.rwonline.com/article/87432
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Old 2009-11-05, 23:15   #164
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Nov. 05

Hi all,

For your info: EBU has announced a EBU-DRM conference at Geneva on 26 Nov. 2009. More info at the EBU's tech site.
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Old 2009-11-17, 13:23   #165
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Hi all,

That's the latest news for DRM in India, here: http://www.radioworld.com/article/90410
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