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[hfsig] Question from Clueless Newbie

Anthony.N.Martin at selex-comms.com Anthony.N.Martin at selex-comms.com
Mon Oct 3 16:00:46 UTC 2005


> Assuming there are no terminal to terminal bandwidth problems,
> is there a way to "capture" the sound cards at both ends once
> the link is established via Echo Link
> and switch them to a higher-bandwidth codec?
> I need to stream at least 20 kHz- 40 would be better,
> and the ability to switch between these rates would
> make it really sweet.

Unlikely I'm afraid.

The data sent over the internet is not 64kbit/s raw
samples in anycase, it's compressed speech. I don't
know offhand what codec it uses, but it's below
32kbits/s. The echolinux source would probably tell you.
(the GSM codec is in there).

Echolink is closed-source but hacking with the linux source
may allow you to achieve what you need if you control both
ends of the link.
http://cqinet.sourceforge.net/

OTOH you could probably hack something up that streams
samples over the net in an hour with TCL/TK and Snack
and it would work on every OS going.

I suggest you join the Echolink yahoo group for discussions
of echolink. But it is not restricted to technical development
issues so the volume of posts is high as there is a large user
base.

Echolink has a plug-in interface but I'm not au-fait
with what can be done with it; such as invoke an external
program to stream samples. I'm pretty sure it can offer
the IPs of connected stations though.


I assume you're trying to stream a chunk of the HF or LF
spectrum so that you could use something like PSK31 remote
or monitor beacons.

Ant M1FDE

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