Re: ARLA/CLUSTER: Feliz Natal e Próspero Ano Novo

[rogerio ferreira]

*Amigo Colega os meus sinceros agradecimentos ... Boas Festas e Bom Ano
Novo.. a si e família... Um abraço*


2013/12/24 Filipe Ferreira <filipect1ddw  hotmail.com>

> *Prezado João Costa e colegas radioamadores em geral*
>
> *Aqui do Portugal profundo onde o vento uiva e a chuva e neve acompanham,
> desejo a todos sem excepção um Feliz Natal e que o Novo Ano vos traga o que
> desejam.*
> *Estes os votos do CT1DDW e QRA.*
>
> *Filipe Ferreira*
>
>
>
>
> Date: Mon, 23 Dec 2013 21:05:39 +0000
> From: ct1fbf  gmail.com
> To: cluster  radio-amador.net
> Subject: ARLA/CLUSTER: Recomendações da IARU para a Região 3
>
>  IARU Recommendations
>
> Dear Colleagues,
>
> I should have sent out this notice much earlier, but please note the
> recommendation below which has been agreed at the Region 3 Directors
> meeting in Tokyo, August 2013.
>
> <Quote>
>
> At the Region 3 Directors meeting held in August 26th and 27th, 2013,
> the following two recommendations were adopted regarding usage of two
> meter band for the amateur satellite service.
>
> 1. It is recommended that the band 144-146 MHz (“two-meter” band) be
> used exclusively for down link on all future satellites.
>
> 2. It is recommended that the 144.000-144.035 MHz section be
> additionally allocated for satellite down link .
>
> Background information
>
> 1. Usage of the band 144-146 MHz for down link only
>
> The band 144-146 MHz (“two-meter” band) is, according to the Radio
> Regulations, allocated to the amateur and the amateur-satellite
> services world-wide on a primary basis with exceptions in several
> footnotes. But by agreement of all three IARU Regions, currently only
> a sub-section, namely 145.80–146 MHz of the allocation, is used on an
> exclusive basis for the amateur-satellite service.
>
> Although the band 145.80 – 146 MHz is presently used for both uplink
> and downlink portions, the Cavtat Conference of IARU Region 1 in 2008
> agrees to recommend its use for downlink-only to reduce interference
> signals from non-amateur signals (illegal’s like taxis) being relayed
> if it is used for uplinks.
>
> The usage of the band 145.8 - 146 MHz reduces path losses by about 9dB
> compared with usage of the band 435 - 438 MHz.
>
> Most amateur satellites do not employ attitude control due to their
> size and financial constraints, therefore the use of simple
> omni-directional antenna would be popular. In this situation 9 dB pass
> loss advantage is essential.
>
> On the other hand, some societies in Region 3 have mentioned that to
> avoid interference signals from non-amateur signals (illegal’s like
> taxis) the band 145.8 – 146 MHz has not been used for downlinks in
> most amateur-satellite services. But comparing effects of interference
> caused by illegal signals on uplinks and downlinks, to avoid uplink
> interference is important because many amateur satellites would be
> affected if there is interference on uplink.
>
> Taking into account these factors mentioned above, it is recommended
> that the band 145.8 - 146 MHz should be used for downlink only in
> Region 3.
>
> 2. Additional allocation of 144.000-144.035 MHz section for satellite
> down link only
>
> The IARU Satellite Advisory Group has been discussing the additional
> allocation of the 144.000-144.035 MHz section for satellite down link
> only taking into account the shortage of spectrum of 2m band for the
> amateur satellite service .
>
> In 2008 it appeared that very little EME was then taking place at the
> very bottom of the 144 MHz band, due to interference from computer
> oscillators. This section is already aligned worldwide and therefore
> it was considered that this could be suitable part of the band to be
> used.
>
> More recent research and discussions suggested that this situation
> remains the same today. Further research has concluded that the bottom
> 35% of the 2 metre band is almost completely unused.
>
> It was noted that Region 1 had also discussed this matter and their
> opinion was on similar lines.
>
> This subject was also discussed at the Region 2 conference in
> September this year and approved.
>
> <unquote>
>
> 73 de Ken Yamamoto, JA1CJP
> Secretary, IARU Region 3
> secretary<at>iaru-r3.org
>
> via NZART
>
>
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