[hpsdr] Alex multi RX config

[Joe Martin K5SO]

Hi Georg,

No, there's nothing special about using Alex filters with two Mercury  
(RX) boards and one Penelope (TX) board.

The Alex T/R relay on each TX Alex board provides protection for each  
Mercury board when in TX mode;  you need two Alex TX/RX filter sets if  
you run two Mercury boards and want bandpass filtering (i.e., HPF and  
LPF both), each Mercury is connected to its own Alex TX/RX filter set.

No additional relays are needed if you have at least the TX  (LPF)  
filter, as that's where the T/R relay is located; refer to the Alex  
manual for clarification.

Independent control of the the Tx and Rx antennas used (ant1, ant2, or  
ant3 for TX and RX) is provided in PowerSDR via  the Setup > Alex  
Antenna Ctrl menu (select Alex as being present on the Setup >  
Hardware Config menu to be able to see the Alex control menu).   These  
menus are shown in the Alex user manual.  The configuration settings  
for Alex are very flexible and versatile, refer to the Alex user manual.

73,  Joe K5SO


On Nov 22, 2011, at 9:06 AM, Georg Prinz wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> for not to reinvent the wheel:
>
> does any speciality exist which shall be considered when building a
> multi board receiver (2 or more mercury boards) with one TX Penelope
> board? How did you manage the RX/TX swith over? Are there additional
> relais necessary? Is there a posibility to choose the TX antenna out  
> of
> the RX antennas by software?
>
> 73, Georg, dl2kp
>
>
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