6 Feb
2021
6 Feb
'21
6:54 p.m.
On 7/2/21 8:32 am, pete M via 44Net wrote:
We dont have high bandwith application?
What about 50 Mb/s ? is that high speed enough?
SDR kike the Hermes-Liet 2.0 can feed the HF spectrum to a software remotely By IP stream
at up to 50Mb/s
Would it be a nice thing to have multiple SDR transceiver on multiple bands all over the
world available to ham that run a 44net adress?
Now that would be neat - having
access to SDR IFs remotely, though those
speeds are only going to be available at a regional level if routing
over the Internet. While I have 80+ Mbps available downstream, that
really only applies to relatively local (within VK for me) endpoints.
Once I'm going overseas, usable bandwidth can drop to 10 Mbps or less,
from end to end. But the 2-2.4 MHz bandwidth of RTL-SDR class devices
might be more practical on an international scale, which means a
transport that can scale to suit available bandwidth. Also, for latency
reasons, we would want optimal routing on our core infrastructure, which
ties back to the previous discussion.
Nice out of the box thinking there. :)
Would it even be a nice intitative to build an high speed RF linking system for that use
case?
The biggest challenge with high speed RF is cost and complexity. Not
everyone is able to build UHF/microwave equipment reliably. I have a
number of issues in that area - some intrinsic, some are time related,
and the cost of high speed/wide bandwidth microwave equipment tends to
be rather expensive, given that amateur applications tend to be low
volume, compared to something like mobile phones or wifi.
I can think of many more project like that.
Most people dont think of such project for a simple reason, most of the mode we use are
narrow by definition, and since the FCC limit the maximum Bandwith available by bands to a
bare minimum and that the USA ham's must comply to this insane thing, the rest of the
world is kind of being drag to that fact.
Just take the New pascket radio project, Canadian hams could use it at the maximum spead
it was designed for, US, nope 70cm bandwith limit will prevent it. Frustrating I must say.
I'm pretty sick to death of being held back by archaic US regulations.
Here, we can also use whatever bandwidth a mode requires, provided we
stay within the band limits (on VHF and up). There may be some
interesting band plan issues on 70cm, but we hams can resolve those. On
1.2 GHz and up, there's bandwidth to burn, and it would be good to make
use of that. :) Maybe the rest of the world should just get on with it
and encourage US hams to lobby to get their regulations updated to match
the rest of the world, and in the meantime, the US battles on as best it
can until they can sort out their regs and join us RF wise.
--
73 de Tony VK3JED/VK3IRL
http://vkradio.com