Re: ARLA/CLUSTER: R.Nova Zelândia Intl., DRM.

[Carlos Mourato]

estimado Carlos Gonçalves
A propósito da "maravilha" do DRM, quando da demonstração na feira de
Moscavide, fomos uns felizardos, ( eu e meu colega que esteve comigo), pois
conseguimos receber a RNZi, durante praticamente uma hora sem um unico
dropout! Só não escutamos mais porque a emissão acabou. A BBC, RTL, DW, e
Radio Kuwait,  foram escutadas durante o dia todo em optimas condições.
Talvez o seu colega radioescuta que escreveu esse comentario não tenha
conhecimento que a robustez da descodificação tem muito a ver com o bitrate.
Uma estação a transmitir em 20Kbps não tem nem de longe a mesma robustez que
uma a transmitir a 11 Kbps.
 Quanto maior o BR, maior a fidelidade como é lógico, mas menor a robustez.
Ele que escute a radio Kuwait, que está quase sempre a 11 Kbps, e veja como
um sinaleco de 20dBuV, com fading consegue manter um audio perfeito e sem
dropouts., mesmo com SNRs de menos de 10dBs.

73 de CT4RK


2006/11/24, Carlos L. R. de A. Gonçalves <carlos-relvas  sapo.pt>:
>
> A propósito da "maravilha" da DRM, talvez fosse curioso notar os
> comentários ss. surgidos neste boletim DX do www.wwdxc.de, que
> reproduzo parcialmente e apenas no que toca à Nª Zelândia e à
> R.NZi em particular.
>
> 73.
> Carlos Gonçalves.
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "BC-DX 78, 24 Nov 2006
>
> NEW ZEALAND   9890 and 7145  RNZI in DRM. Today R NZi on 7145 kHz I
> decoded for the first time not only the station ID on 5-6 dB SNR, but now
> at 1320 UT at peaks up to 17 dB signal to noise ratio - also listen the
> clear audio of their program. In 1100-1300 UT range noted Rangitaiki on
> 9890 kHz in DRM mode, but with lot of dropout breaks in between, today Nov
> 21. 9890 signals only decoded in 'above' 11-14 dB SNR range.
> An OM in Innsbruck Austria, Keith Gruenberger told about RNZI DRM on 9890
> kHz since 0930 UT with SNR 23 dB!
> R NZi uses one day 9870, but 9890 on the other day. Strange.
> (wb, wwdxc BC-DX Nov 21)
>
> DRM R NZi 7145 / 9890 kHz.
> I wonder if reception is actually about to crash. I often have noticed
> extremely good reception one day followed by terrible reception the next.
> I wonder if this is the case with your DRM reception?
>
> Certainly strong signal strength is required to decode DRM. When I was in
> Cairns, North Queensland a few months ago I listened to RNZI DRM there and
> in spite of the generally strong signal being received, there were still
> dropouts in the audio during fades. So I can't really see that DRM will be
> the saviour of shortwave, because of that. At least with analogue there is
> always something to be heard, even during fades.
> I had a bit of trouble trying to hear RNZI in Western Australia a couple
> of weeks ago. I guess that is to be expected given that most of the time
> the RNZI transmission is beamed due north at 0 degrees and Western
> Australia is something like 250 begrees in a line from N.Z. and is about
> 7,000 km away.
>
> I couldn't hear anything at all during daylight on 15720 or 17675 kHz. At
> night I could hear 9890, 13840 & 5950 kHz, but not very well. I aways like
> to keep up with News from N.Z. via RNZI when I am overseas, but it was
> hard to in W.A. Almost no N.Z. is ever reported in Australia, apart from a
> gruesome murder, sport, or some kind of oddball happening!
> (Barry Hartley-NZL, wwdxc BC-DX Nov 21)
>
> RNZI DRM missing again, no trace of it on 7145 kHz Nov 18 at 1431 UT. Are
> any Pacific relayers actually relying on this as their feed source? Both
> DRM on 9890 and AM on 9870 were coming in well earlier around 0630 UT.
> (Glenn Hauser-OK-USA, dxld Nov 18)
>
> I'm bemused that RNZ is using DRM. From its own website the target
> audience is our Pacific neighbours to the north. Even the most wealthy of
> those, Fiji has a homeless population of 95,000. The question needs to be
> asked - who in that potential audience has DRM reception capability? And
> clearly the service, as you have indicated is unreliable.
> (Adrian Verry-NZL, dxld Nov 21)
>
> O, RNZI say that DRM is mainly for affiliates relaying their signal,
> somehow an improvement over satellite links (dishes get jostled and blown
> out of alignment, stations don't now how to get RNZI back, etc.), with
> analog, while it lasts, still for the general public (gh).
>
> Oh, I see. A pity they take up so much bandwidth to achieve that. As it is
> almost a commercial operation perhaps they would be better using an out of
> band frequency. Most of our BCB networks have no problems with satellites.
> (Adrian Verry-NZL, ibid.)
>
> Again Nov 20 at 1411 could not detect any DRM on 7145 kHz; indeed, there
> was a very weak analog carrier from something on 7145 kHz, perhaps FEBA
> Tashkent per HFCC, plus Arabic on 7140, probably BBC Cyprus. Meanwhile,
> RNZI analog 5950 kHz was audible.
> (Glenn Hauser-OK-USA, dxld Nov 20)
>
> 5950  R. NZi, Rangitaiki, at 1504-1545 UT on 16 Nov, English, Pacific Reg.
> news, Dateline Pacific prgr; 23442, adjt. QRM.
>
> 9870  R. NZi, Rangitaiki, 1035-1058*, 11 Nov, 55433.
>
> 13840  R. NZi, Rangitaiki, at /1059-... UT on 11 Nov, IS, TS, English,
> news, National R. prgrs; 55544.
> (Carlos Goncalves-POR, wwdxc BC-DX Nov 23)"
> __________________________________________________________
>
>
>
>
>
>
> _______________________________________________
> CLUSTER mailing list
> CLUSTER  radio-amador.net
> http://radio-amador.net/cgi-bin/mailman/listinfo/cluster
>



-- 
BPL/PLC ......No thanks!!!
Best 73 from:
regards from:
CT4RK
Carlos Mourato
Sines - Portugal

-----------------------------------------------------------
Este e-mail destina-se a fornecer informações de utilidade para os
destinatarios referidos, e não poderá ser considerado SPAM.
Se não desejar receber mais informações deste emissor, responda a este mail
com -REMOVER- no campo "ASSUNTO", ou bloqueando o emissor deste mail, nas
suas configurações de privacidade.
Esta mensagem está de acordo com a legislação Europeia sobre o envio
de mensagens (Directiva 2000/31/CE do Parlamento Europeu; Relatório
A5-0270/2001 do Parlamento Europeu).