[hpsdr] OK you smart guys

[David McQuate]

Hermes implements an interface to either Alex or (future) Apollo, with 
serial data including current frequency.  When multiple receivers (in a 
single Mercury) are being used it's a little more complicated.  Alex Tx 
low-pass filter is selected from the highest-frequency receiver, while 
the Rx high-pass filter is determined by the lowest-frequency receiver.

Alex and Apollo data is different.  I'll bet the Racal and Cubic each 
have their own unique requirements.  Some of the ethernet / usb protocol 
specifies whether Alex or Apollo is being used.  That protocol would 
need to be augmented to indicate one of the other preselectors.  (And 
more FPGA code written, of course.)

Dave
WA8YWQ

On 12/3/2012 6:52 PM, FRANCIS CARCIA wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Hi All,
> Question: Does the operating frequency reside in a Hermes/Mercury FPGA 
> register where it could be moved and shifted out through a serial 
> interface?
> Harris, Collins, Cubic ETC all made really nice pre/post selectors 
> designed to work in a high level RF enviorment. These devices would be 
> perfect as a front end for SDR and some handle 1/2 of TX power. Also 
> Racal made a nice single or dual 13 filter preselector that covers 
> .5MHz to 30 MHz. used in their HF DF systems.  It would be very cool 
> to have devices like these track HPSDR because duplicating the 
> performance and quality would cost a lot of money.  I have a dual 
> Racal preselector interfaced to my Pandora dual mercury box controlled 
> by a switch.
> I've also tested the Cubic preselector and find it pretty sharp. I'll 
> control it with 4 thumbwheel switches if I have to.
> Santa, I wasn't that bad....Frank WA1GFZ
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/

-- 
Clear Stream Technologies

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20121203/0534c476/attachment-0004.htm>