[hpsdr] Proposal for a 'low-end' RX/TX board for HPSDR

[KD5NWA]

Lower QSD noise is a good thing, and a worthy goal, but is not the 6M band so 
quiet that it would benefit from a pre-amp anyway in order to receive very 
weak signals?

Signals so weak that in the lower bands they are masked out by atmospheric 
noise but not so in the 6M band.

Even with lower QSD noise the noise of the sound card has to be overcomed 
also, although the figures comming out of the Janus are simply wonderful.

Fix the QSD problem if it's fixable but I would not count out a low noise 
pre-amp. With a lower noise QSD you might not need very much gain but it 
might be nice to be able to kick it in if needed.


On Monday 24 July 2006 20:24, pvharman at arach.net.au wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> If we fix the 'increasing noise figure with frequency' problem with the QSD
> then we don't require a pre-amp on any band - including 6m.
>
> All a pre-amp is going to do is reduce the IP3. Lets put all our effort
> into the QSD problem - once solved we progress the radio art for everyone.
>
> Phil...VK6APH
>
>
>
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-- 

Cecil
KD5NWA
www.qrpradio.com www.hpsdr.com

Who knows what evil lurks in the hearts of men? The Shadow Knows!


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