[hpsdr] Possible enhancement for Angelia

[John Marvin]

  Since Angelia is planning on having two A/D channels, would it be 
possible to "take a step backward" and provide a method of using the two 
channels for wide bandwidth I/Q data? In particular, (I don't know if 
there are licensing issues here), could room be found on the board (or 
the other side) for a single USRP daughter card socket? Obviously the 
socket has a lot of connections other than the I/Q inputs, and 
additional FPGA work would need to be done, including the support for 
controlling such a daughter card (I also don't know if there are enough 
spare lines available for such control). This would allow Angelia to 
take advantage of a variety of available daughter cards already 
available for USRP/USRP2.

I'm sure people are going to say that if you want to use USRP daughter 
cards just buy a USRP2.  But those are really expensive (I know Angelia 
will also be fairly expensive), and people who prefer the features of 
Angelia might like having the additional option of working with higher 
frequencies (just not with the advantages of DDC), without having to 
also buy a USRP2.

  I know there would be a variety of other issues, some I have thought 
of (e.g. how to route the antenna input to either the daughter card or 
directly to the ADC and the daughter card output then going to the ADC), 
and probably others that I haven't considered.

Anyway, I just thought I'd put the idea out there for consideration.

Thanks,

John
AC0ZG