[hpsdr] Multiple receivers on single mercury with down converters

[Glenn Thomas]

I have to ask - are your proposed two down converters phase coherent?

A more basic question, does the polarity diversity processing you are 
proposing require phase coherence?

73 de Glenn wb6w

On 8/22/2012 1:11 PM, mark kilmartin wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Just wanted to see if an idea I have been considering would be 
> possible/practical to implement.
>
> Firstly what I'm trying to do.
>
> I would like to receive dual polarization signals (initially for EME 
> and on the 2M band, but later on higher bands and terrestrial work)
>
> I assume this would be fairly easy with two Mercuries followed by two 
> down converters.
> But what I was wondering is would this be practical to implement with 
> two down converters each using a separate IF and fed into a single 
> Mercury that was in turn configured with two receivers.
> e.g. down converter 1 with an IF of 50 MHz and down converter 2 with 
> an IF of 40 MHz and both down converters then combined and fed into 
> Mercury.
>
> I'm thinking this might allow the two receivers to be started with a 
> consistent phase relationship which currently seems to be an issue 
> with multiple Mercuries (and at a lower cost)
>
> If the above is possible would it be practical to implement a similar 
> arrangement for transmit with Penny (not sure if multiple transmitters 
> have been implemented yet.
>
> I won't be able to do any work on practically testing this for at 
> least a few months but wanted to get an opinion on the practicality 
> first off.
>
> Thank you
> Mark
> EI4FNB
>
>
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