[hpsdr] Multiple receivers on single mercury with down converters

[mark kilmartin]

Joe

Thank you for the clarification

Mark

On 30 August 2012 18:35, Joe Martin K5SO <k5so at valornet.com> wrote:

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>
>
> Mark,
>
> It may be that all the discussion regarding phase stability has masked the
> pertinent answer to your original question of obtaining V and H diversity.
>  Your suggestion of using dual down converters into a single Mercury
> receiver running in multiple receiver mode with one receiver tuned to 50
> MHz and one to 40 MHz will work perfectly well to achieve polarization
> diversity, with no special concerns regarding phasing whatsoever.
>
> For simple diversity operations you do not need to have the two channels
> coherent.  To achive stable nulls/peaks with manual phasing controls you do
> need coherence, certainly, but if the goal is to simply obtain polarization
> diversity you do not need phasing adjustments at all and you do not require
> coherent receivers to achieve it.
>
> The scenario you proposed originally will result in an audio stream that
> contains contributions from both V and H polarized waves; thus you will
> have polarization diversity operation.  That "non-coherent" configuration
> will allow you to be immune to "Faraday lock out" conditions on EME, as an
> example.  No special consideration need be given to the LO soucre(s) for
> your down-converters, in this case.
>
> 73,  Joe K5SO
>
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