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Sounds right for the FPGAs. This is something I will keep in mind as I
work on Mercuy, Penelope and Ozy FPGAs. In an upcoming release all of
these FPGAs will be changing anyway. Phil Harman and I have been
looking at reducing the amount of clock signals running around on Atlas
and may have a solution which I will work on implementing. It will
affect the Mercury, Penny and Ozy FPGAs<br>
<br>
Kirk Weedman KD7IRS<br>
<br>
Steven Wilson wrote:
<blockquote cite="mid:496243B8.5000605@intrinsix.com" type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
Johan,
>From my understanding of how Mercury works - you would have to modify
the FPGA to pull this off. There are several possible limits that may
cause issues.
The FPGA implements the DDC, i.e. you create I/Q by taking the raw data
in from the A/D and multiply it by a phase angle changing at the
frequency band you are listening too. Consequently, to fit "two"
receivers into the single FPGA you would first have to double the entire
DDC structure within the FPGA. The first limit you have to be concerned
about is - will this second structure fit into the FPGA.
The next limit is can the FPGA spit out a new multiplexed data stream
containing both receiver's I/Q data to Ozy, is there enough bandwidth
between the two to pull this off.
Next is whether there is head-room in the USB communications from Ozy to
your host computer.
Finally - do you have enough Flops in your computer to process the
second receiver.
These are some of the limits I can see for an implementation with the
current hardware.
At the same time, I believe some people are using two Mercury's already
- so maybe this is an existence proof of enough bandwidth in Ozy and
USB. (Two mercury's is the more expensive solution ;-)
If anyone on the list wants to correct my statements above - then I'll
learn something too!
73 de Steve KA6S
Johan Maas wrote:
</pre>
<blockquote type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
------------------------------------------------------------------------
Hi All,
Still awaiting for Mercury....
But a question about the following possibility:
Is it possible to select multiple different bandsegments?
For instance i like to select the ssb section of the 80m band and also
listening on the ssb section on the 10m band and listening to tFM
section on 6m?
Are there constraints?
73 Johan PA3GSB
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