DRM Software Radio Forums  

Go Back   DRM Software Radio Forums > DRM Software Radio - User Forums > General Topics
User Name
Password
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 17-06-2009, 02:39   #151
zfyoung
Registered User
 
Join Date: Aug 2006
Location: BaiSe, P.R. China @E106°36′ N23°55′
Posts: 245
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.
__________________
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 : 17-06-2009 at 02:42.
zfyoung is offline   Reply With Quote
Old 17-06-2009, 09:31   #152
maxpower
Registered User
 
Join Date: Dec 2003
Location: Oldenburg, Germany
Posts: 479
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
__________________
"Pappradio" 2 SDR / Himalaya 2009, near Leer/Ostfriesland (Web remote-controlled) 15m Long-Wire / Active Deltaloop, Asus Xonar 192 kHz / Realtek HD Soundcard, Atom 330 ITX Mainboard, rural area; 53'10N, 7'27E;
maxpower is offline   Reply With Quote
Old 17-06-2009, 11:26   #153
Roy Sandgren
Registered User
 
Join Date: Jun 2003
Location: Malmö, Sweden
Posts: 61
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.
__________________
DRM is cross the border service.
Roy Sandgren is offline   Reply With Quote
Old 17-06-2009, 20:21   #154
DRM-OM
Registered User
 
Join Date: Mar 2006
Location: SW Germany
Posts: 310
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.
__________________
greetings ...

some german language info pages on DRM

Last edited by DRM-OM : 17-06-2009 at 20:25.
DRM-OM is offline   Reply With Quote
Old 17-06-2009, 20:39   #155
DRM-OM
Registered User
 
Join Date: Mar 2006
Location: SW Germany
Posts: 310
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.
__________________
greetings ...

some german language info pages on DRM

Last edited by DRM-OM : 18-06-2009 at 04:27. Reason: corrected the link
DRM-OM is offline   Reply With Quote
Old 18-06-2009, 02:47   #156
zfyoung
Registered User
 
Join Date: Aug 2006
Location: BaiSe, P.R. China @E106°36′ N23°55′
Posts: 245
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.
__________________
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′
zfyoung is offline   Reply With Quote
Old 18-06-2009, 06:50   #157
DRM-OM
Registered User
 
Join Date: Mar 2006
Location: SW Germany
Posts: 310
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.
__________________
greetings ...

some german language info pages on DRM

Last edited by DRM-OM : 18-06-2009 at 09:34.
DRM-OM is offline   Reply With Quote
Old 27-06-2009, 18:42   #158
radiomann
Registered User
 
radiomann's Avatar
 
Join Date: Jun 2003
Location: kent
Posts: 297
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
radiomann is offline   Reply With Quote
Old 27-06-2009, 20:54   #159
Roy Sandgren
Registered User
 
Join Date: Jun 2003
Location: Malmö, Sweden
Posts: 61
Yap, get your own shortwave or mediumwave transmitter in drm.
Best of all is an analouge on mediumwave and a drm on shortwave.
__________________
DRM is cross the border service.
Roy Sandgren is offline   Reply With Quote
Old 17-09-2009, 12:36   #160
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,752
Sept. 17

Hi all,

This may be is interesting: http://radiomagonline.com/digital_ra...profiles-0916/
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 17-09-2009, 13:16   #161
Roy Sandgren
Registered User
 
Join Date: Jun 2003
Location: Malmö, Sweden
Posts: 61
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.
__________________
DRM is cross the border service.
Roy Sandgren is offline   Reply With Quote
Old 17-09-2009, 19:19   #162
pb1
Registered User
 
Join Date: Jun 2007
Location: Amsterdam, the Netherlands
Posts: 61
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 Images
File Type: pdf drtv bw.pdf (55.5 KB, 394 views)

Last edited by pb1 : 18-09-2009 at 07:08. Reason: Attachment added
pb1 is offline   Reply With Quote
Old 22-09-2009, 07:47   #163
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,752
Sept. 22

Hi all,

I think this is encouraging: http://www.rwonline.com/article/87432
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 05-11-2009, 22:15   #164
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,752
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.
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 17-11-2009, 12:23   #165
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,752
Nov. 17

Hi all,

That's the latest news for DRM in India, here: http://www.radioworld.com/article/90410
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is On
Forum Jump


All times are GMT. The time now is 21:41.


Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.