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In article ,
"Stig Hartvig Nielsen" wrote: "starman" wrote: The success of DRM doesn't depend on perfect propagation conditions. If it did, the proponents of this technology wouldn't consider using it for ionospheric propagation. It's a matter of how degraded the conditions can be before the digital signal can not be decoded properly. DRM has considerable tolerance for poor propagation. I have to disagree. After trying the first "stand alone" DRM receiver for a week now (from MAYAH) - I must say that so far I haven't been able to listen to ANY broadcasts in DRM without many, many breaks. With the built in telescopic aerial hardly anything in DRM is receivable but with an outdoor longwire aerial I do get a few of the VERY strongest stations broadcasting in DRM, such as RN, RTL and DW. However, so far I haven't heard anything souding reasonable. It is impossible to follow a programme because when the signal fades out briefly the sound will become very distorted and then disappear for a few seconds or even several seconds - then the distorted audio appears again and then clean audio for a while till the next deep fade. As everyone knows - with AM you can easily follow a programme even though there is some fading. Either is the MAYAH DRM receiver very very poor - or DRM is only usuable when you have a local, stable signal with no fading. Your experience is what I expect from this technology on short wave and I don't think it has anything to do with your particular receiver being poor. -- Telamon Ventura, California |
Telamon schreef:
In article , "Stig Hartvig Nielsen" wrote: "starman" wrote: The success of DRM doesn't depend on perfect propagation conditions. If it did, the proponents of this technology wouldn't consider using it for ionospheric propagation. It's a matter of how degraded the conditions can be before the digital signal can not be decoded properly. DRM has considerable tolerance for poor propagation. I have to disagree. After trying the first "stand alone" DRM receiver for a week now (from MAYAH) - I must say that so far I haven't been able to listen to ANY broadcasts in DRM without many, many breaks. With the built in telescopic aerial hardly anything in DRM is receivable but with an outdoor longwire aerial I do get a few of the VERY strongest stations broadcasting in DRM, such as RN, RTL and DW. However, so far I haven't heard anything souding reasonable. It is impossible to follow a programme because when the signal fades out briefly the sound will become very distorted and then disappear for a few seconds or even several seconds - then the distorted audio appears again and then clean audio for a while till the next deep fade. As everyone knows - with AM you can easily follow a programme even though there is some fading. Either is the MAYAH DRM receiver very very poor - or DRM is only usuable when you have a local, stable signal with no fading. Your experience is what I expect from this technology on short wave and I don't think it has anything to do with your particular receiver being poor. -- Telamon Ventura, California If this is true, than DRM is not fit for SW, or any other frequency with alternating frequency quality. ruud |
On Mon, 31 May 2004 00:04:33 +0200, "Stig Hartvig Nielsen"
wrote: Either is the MAYAH DRM receiver very very poor - or DRM is only usuable when you have a local, stable signal with no fading. I wonder if your experience may be due to using the Mayah. I have been using the WinRadio G303i PC-based receiver with the software-based DRM decoder, and the result is superb: I have very few drop-outs on weak signals, and no drop-outs whatsoever on strong stations. Could it be that the DRM decoder used in the stand-alone Mayah receiver is not that good as the PC-based one? One can imagine that the PC-based software should be more sophisticated than the firmware inside a chip... David |
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On Mon, 31 May 2004 15:29:57 +0200, Ruud Poeze wrote:
Telamon schreef: In article , "Stig Hartvig Nielsen" wrote: "starman" wrote: The success of DRM doesn't depend on perfect propagation conditions. If it did, the proponents of this technology wouldn't consider using it for ionospheric propagation. It's a matter of how degraded the conditions can be before the digital signal can not be decoded properly. DRM has considerable tolerance for poor propagation. I have to disagree. After trying the first "stand alone" DRM receiver for a week now (from MAYAH) - I must say that so far I haven't been able to listen to ANY broadcasts in DRM without many, many breaks. With the built in telescopic aerial hardly anything in DRM is receivable but with an outdoor longwire aerial I do get a few of the VERY strongest stations broadcasting in DRM, such as RN, RTL and DW. However, so far I haven't heard anything souding reasonable. It is impossible to follow a programme because when the signal fades out briefly the sound will become very distorted and then disappear for a few seconds or even several seconds - then the distorted audio appears again and then clean audio for a while till the next deep fade. As everyone knows - with AM you can easily follow a programme even though there is some fading. Either is the MAYAH DRM receiver very very poor - or DRM is only usuable when you have a local, stable signal with no fading. Your experience is what I expect from this technology on short wave and I don't think it has anything to do with your particular receiver being poor. If this is true, than DRM is not fit for SW, or any other frequency with alternating frequency quality. Ruud, DRM is fitted for SW, but as receivers are still in the development stage, DRM currently only works (more or less) reliably on not-too-long distances from the transmitter, while using at least a long wire antenna. DRM Rxs are currently not as good as plain old AM Rxs, to say the least. That's the impression I got from (yet another) review of the Mayah (in German): http://www.teltarif.de/arch/2004/kw23/s13868.html (got the link from a german group, news:de.alt.hoerfunk , msg-id: ). -- mvg, Giovanni. |
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