[hpsdr] Antenna selection

[Bob Cowdery]

Hi Phil,

Thanks, I'm gradually getting back into things. I guess what I really
need to know is how to drive the CC bits. Have I got it correct below?

C0 = 0x0
C3
Alex Attenuator - self explanatory
Preamp on/off - I guess is a global setting.
Alex Rx Antenna - fair enough I can select None, Rx1, Rx2 here.
Alex Rx out - Set if Alex Rx Antenna > 0 - I presume this enables Rx 1
Out which can be looped back in?

C4
Alex TX relay - so this selects the Tx antenna and the Rx antenna unless
'Alex Rx Antenna' is > 0 which then takes precedence as the Rx input.


C0 = 0x12

C2
Alex manual HPF/LPF select - I assume from this that filter switching is
done in the firmware unless this is set.

C3/C4
Manual filter settings if C2 set to manual.
Disable Alex T/R relay - receiver only mode?

C0 = 0x14
C1 RX1-RX4 pre-amp - slightly confused. How does this play with the
'Preamp on/off' setting and why is it only 4 RX's

Thanks for any help
 73 Bob G3UKB

On 26/11/2014 04:42, Phil Harman wrote:
> Hi Bob,
>
> See page 4 of the Alex Manual obtainable from here:
>
> http://openhpsdr.org/documents.php
>
> You can either transceive on Antenna 1, 2 or 3 or Tx on Antenna 1, 2
> or 3 and Rx on an antenna connected to Rx1 or Rx2.
>
> You can also insert an external filter/preamp/converter etc between
> Antenna 1, 2 or 3 and Rx1.
>
> Hope that helps.
>
> 73 Phil...VK6PH
>
>
>
> -----Original Message----- From: Bob Cowdery
> Sent: Wednesday, November 26, 2014 3:48 AM
> To: hpsdr at lists.openhpsdr.org list
> Subject: [hpsdr] Antenna selection
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> I'm just working out how to code up the antenna switching. I was looking
> at PowerSDR to see what it did. I've not checked the code and I can't
> test it as my Alex isn't hooked in yet so was wondering if someone can
> enlighten me on how it works. It looks like PowerSDR allows both Antenna
> 1-3 and an RX only input to be selected so how does it know which one to
> use or is it just done on priority i.e. R1/2/XV if selected else 1/2/3.
>
> 73 Bob G3UKB
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