[hpsdr] Status of Hermes Gigabit

[John Marvin]

Have you even been reading this thread?

First, I don't even understand your "swamp" the Lan comment. If you 
don't use any features that will cause Hermes to send more data, then 
the same amount of data would still be sent on the lan, it would just be 
sent in shorter bursts. However, even without using any more data, it 
would cut latency down if you had an end to end gigabit connection 
between Hermes and your PC. If you have a WIFI connection in between, 
the WIFI wouldn't see any difference at all.

Second, let me explain in more detail my previous post, which covered at 
least two other reasons why Gigabit ethernet would be useful:

1) The current max per receiver bandwidth is 384 Khz. This can cover the 
entire bandwidth of most of the HF Ham bands (160m, 60m, 40m, 30m, 20m, 
17m, and 12m), but not all of them, i.e. 80m (500 Khz wide, 15m (450 Khz 
wide) , 10m (1700 Khz wide) and 6m (4 Mhz wide). It's nice to be able to 
see the entire band in the waterfall. PowerSDR supports stitching 
multiple receivers to come closer to this, since it doesn't support 
simultaneous waterfalls. CUSDR does not.  There's support in the 
firmware source (not currently enabled) to support ~1Mhz bandwidth per 
receiver, but since the protocol doesn't allow different sample rates 
for each receiver, if you wanted that bandwidth (and the feature was 
enabled) for even one receiver, you would require a gigabit connection. 
Note that this is only referring to current software. Having the wider 
bandwidth per receiver is a base feature that can enable more 
interesting features in the future.

2) Phil and others are actively working on a new protocol where the DSP 
processing is done off board. In order to do this they need a fat pipe 
in order to pass an extra wide band signal (I believe they are planning 
for 30Mhz currently) to the external processor. That will require a 
gigabit connection.

I am very interested in both of the above possibilities. Perhaps you 
don't care about those features, but that is still a far cry from people 
just wanting it just to say it uses it.

73,

John
AC0ZG

On 4/30/2015 2:46 PM, Neal Campbell wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> I think that gigabit ethernet is a "gee-whiz" feature that, if it 
> worked to its billing, would swamp the lan not to mention wifi users.
>
> I understand the excitement of wondering if something can be done but 
> its just not a feature that will benefit anyone but the geekers who 
> want to say it uses it!
>
> JMHO!
>
> 73
>
>
> Neal Campbell
> Abroham Neal LLC
>

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