[hpsdr] Multiple receivers on single mercury with down converters

[Phil Harman]

Hi Mark,

I would be concerned about the drift of the LC filters used in this design.

Any phase change, due to say changes in the filter performance with
temperature, will cause a phase change in your down converted signals.

I suggest that two 2m converters fed from the same LO is a better starting
point and feed these to two Mercury receivers.

73 Phil...VK6APH


> ***** High Performance Software Defined Radio Discussion List *****
>
> Thank you everybody for the responses so far, I guess I have some more
> experimenting to do, it is good to know that there are no obvious gotchas
> to what I'm thinking.
>
> In practice I will probably use a pair of the DFS boards from G4HUP
> http://g4hup.com/DFS/DFS.htm to generate the LO signals so maintaining the
> phase coherency should be doable.
>
> The experimenting is half the fun :)
>
> Mark
>
>
>
> On 28 August 2012 02:10, Phil Harman <phil at pharman.org> wrote:
>
>> Hi Mark,
>>
>> > 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.
>> >
>>
>> As others have indicated, what you propose will work fine assuming your
>> 2m
>> IFs are derived from the same, or phase locked, local oscillators.
>>
>> Multiple transmitters have been implemented in Penny previous in order
>> to
>> provide simultaneous data beacons on multiple bands.
>>
>> 73 Phil...VK6APH
>>
>>
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