[hpsdr] Status of Hermes Gigabit

[John Marvin]

Thanks Helmut for the additional information. I was concerned about the 
extra power, because the demand for Gigabit is kind of a chicken/egg 
issue, and was wondering if it was only an issue with the internal 
regulator. I was concerned by the "lab bench" comment, possibly 
indicating not being able to deliver the current where it was needed, 
even when using an external 5V regulated supply using J10.

There is no need right now Gigabit since the firmware supports only 384 
Khz max bandwidth per receiver (which can be stitched as is done in 
PowerSDR). But the firmware source supports the possibility of turning 
on higher bandwidth per receiver, which is one reason that Gigabit would 
be useful. The other reason would be the future protocol where most of 
the DSP is done off board. In that scenario Gigabit speeds would be a 
requirement.

I've been wondering if the Gigabit support is just a modification of the 
existing 100Mbit support, i.e. both could be supported with the same 
firmware, or if it's an either/or situation due to the Gigabit support 
being a significantly different design, possibly taking too many 
resources to support both speeds as originally designed based on the J13 
jumper.

John
AC0ZG

On 4/29/2015 3:32 PM, Helmut wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Thanks Steve for sharing the info. No worries with HERMES. The additional
> 350 mA is only a issue for the internal 5V regulator on HERMES, but there a
> DC-terminal in front of the power switch on the board for external 13.8V and
> 5V supplies (J10).
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Steve
> Haynal
> Gesendet: Mittwoch, 29. April 2015 22:46
> An: hpsdr at openhpsdr.org
> Betreff: Re: [hpsdr] Status of Hermes Gigabit
>
> ***** High Performance Software Defined Radio Discussion List *****
>
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