[hpsdr] LAN - WLAN

Wed Dec 19 04:24:59 PST 2012

Thanks John and Gerhard for the quick reply and clarification!

For remote access I was successfully using John Melton's ghpsdr3 servers but
wondered if there are some hidden options to PowerSDR or some config-tricks
to also run the boards on a remote subnet or network. 
The dspservers of ghpsdr3 nicely reduces traffic over the links and is
routable but the Qt-Radio or Java clients don't offer all the features
(including TX support) as PSDR has. cuSDR with TX-support maybe an
interesting alternative with its client-server concept.

Maybe there is room for future enhancements for PowerSDR to be able to
connect to a specific board (similar to cuSDR or KK is doing it...) and make
them accessible from remote? - It definitely would be nice to run multiple
TRX on same subnet and access the boards from outside i.e. via HAMNET (of
course assuming there is enough bandwidth on the link...).

Thanks & 73,
Bernd/OE1ACM 

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of John Marvin
Sent: Mittwoch, 19. Dezember 2012 12:05
To: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] LAN - WLAN

***** High Performance Software Defined Radio Discussion List *****

  Bernd,

Here are some answers that I believe are correct:

1) Since Discovery is done as a local broadcast you can't do discovery from
a different subnet.
2) Even if you were to use a static IP address my understanding is that you
still can't get to a Hermes or Metis on a different subnet. This is due to
the fact that they do not support any form of routing so they will just send
out a ARP request on the local subnet and not get a response.  It's possible
that you might be able to get around this if your router supports static arp
table entries. This would allow the router to respond for the remote host,
but that is a hardwired configuratione, i.e. the remote host(s) would have
to have static IP's, and you'd have to put a static arp table entry in for
every host that wanted to access Hermes. Kind of ugly, but it might work.
3) You can run multiple Hermes/Metis on the same lan, but not all software
supports selection of a particular radio. However, they do all ignore a busy
radio. As far as I can tell PowerSDR does not allow any form of selection.
Both KISS console and CuSDR do allow selection. So if you want to run
multiple versions of PowerSDR you would be able to (i.e. 
the first PowerSDR would find one of the radios and then the second would
ignore the busy radio and choose the other radio), but you might not be able
to guarantee which one got assigned to which radio if that mattered.

For true remote access you probably want a server on the local subnet anyway
which can compress the audio going out over the internet.

John
AC0ZG

On 12/19/2012 2:52 AM, Bernd Gasser wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Gerhard,
> I'm running a similar setup on WLAN but noticed that the bandwidth may 
> be too low especially for the higher traffic when running RX2 and I'm 
> sometimes getting distortions on Audio.
>
> Regarding your setup '2 Gigabyte switches - Ubiquiti 5 GHz link / 180
> Mbs/~900 ft - 2 Gigabyte switches' - I'm assuming you are running the 
> Ubiquiti in bridge-mode (L2) or do you have them setup as routers with 
> different IP-subnets?
>
> If on IP-subnets, I'd have a few questions (maybe also to the greater
> audience):
> When having Hermes and the PC on different IP-subnets, how does 
> discovery of Hermes work? - Fixed IP on Hermes? - But how to convince 
> PowerSDR to identify and select a specific Hermes board on a 'remote' 
> IP-subnet? - As I have seen PSDR is just doing a broadcast on local 
> subnet to find Hermes or Metis. Not sure what happens here with 
> multiple Hermes/Metis on same IP-subnet?
>
> Assuming there is a way to identify a specific Hermes/Metis board on 
> local or remote IP-subnets, would it be supported to run multiple 
> different boards on same LAN? In this case - how to assign a specific 
> board to one of multiple instances of PSDR?
>
> Background for the questions - I'm running three HPSDR TRX now 
> (Ozy(USB) /
> Metis&Hermes(LAN)) and I'd be looking for a way to run Hermes and 
> Metis in parallel on the same NW or have it accessible from remote (i.e.
HAMNET).
>
> 73,
> Bernd/OE1ACM
>
>
>
> -----Original Message-----
> From: hpsdr-bounces at lists.openhpsdr.org 
> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Gerhard Burian
> Sent: Mittwoch, 19. Dezember 2012 08:41
> To: hpsdr at openhpsdr.org
> Subject: [hpsdr] LAN - WLAN
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello,
>
> Just want to report about successfully setting up the Hermes/Anan10 
> box and running PowerSDR RX2 over a LAN and WLAN link:
>
> Hermes - 2 Gigabyte switches - Ubiquiti 5 GHz link / 180 Mbs/~900 ft - 
> 2 Gigabyte switches - PC
>
> Ping response is 1 - 4 ms.
>
> I can now operate from my office desk all day long J!
>
> I want to thank everyone for making this possible.
>
>
>
> Gerhard OE3GBB
>
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