[hpsdr] New Hermes 2M Board

[n3evl]

Helmut et al,

Please continue these technical discussions on list - I, and I expect 
many others, enjoy these discussions and even if we're not all as 
knowledgeable of the technical fine details, I consider them food for 
thought and an opportunity to learn more, etc.

Pete, N3EVL

On 7/10/2017 3:56 AM, Helmut Oeller wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Larry,
>
> We can gladly continue our discussion in detail also off list. I hope that I
> waste not too much bandwidth here for the following conclusion:
>
> 1. There exists no practical and economic alternative to the 14/16 Bit, 140
> Msps ADC with ENOB > 11.5. But that's more we need, if we use intelligent
> methods in our real-time application to keep the ADC at its best DR of 95
> -100 dB, i.e. advanced software control of preamp or S-ATT depending on the
> environment conditions. Each Smartphone can keep connection to the base
> despite another phone operates close by and both employ an analogue direct
> conversion frontend (hi).
>
> 2. As the impact of manmade noise and RFI becomes a more severe problem than
> intermodulation, caused by broadcastings stations in the past, it's very
> helpful to provide two ADC channels for diversity etc. If not used the
> second channel can provide undersampling of VHF-bands. Even crossband
> operation is possible.
>
> 3. Military applications like frequency hopping, spread-spectrum modulation,
> MIMO etc. are not of interest for the majority of the hams. Even very
> interesting options like FreeDV waste away. Last but not least all has to
> fit into a reasonable economic frame.
>
> 73, Helmut, DC6NY
>
>
>
>
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