[Elecraft] Digitized IF over IP?

[Steve Sergeant]

Somebody must have already written the code to collect several hundred
FFT bins of 100 or 125 millisecond duration over IP as single-line
updates to a display app on the far end. With typical compression (LZV,
RLL, etc.) that would yield around a 300kbps bitstream or so for 512
frequency bins and 1/8-sec updates; not really a lot of data for most
modern Internet connections.

This is all really well-understood technology which is well supported by
a number of development environments.

I couldn't tell you what commercial products do this, if they do exist.


On 11/20/17 11:58 AM, Tom wrote:
> Hi,
> That would be incredibly inefficient if you really want the whole IF.
> The IF output of the K3 is 8.215 MHz so you would have to sample at
> twice this.
> On the other hand, the original questions was "Has anyone digitized the
> K3S IF and streamed it over an IP connection?"  and the answer is yes,
> many people people have.
> However, there is always something sampling the IF at the K3 and then
> providing some sort of processing before hand.
> For example you could hook up an SDRPlay and sample at 2MHz and you will
> then have a maximum bandwidth of 2MHz.  That will be perfectly fine.
> However, again, it is not that efficient.  What do you want your
> panadapter to display?  Your display has a finite number of pixels. 
> Today, the highest resolution would be 4K where you have 3840 data
> points.  Why send all 4 million data points when you need to display
> only 3840?  Of course I'm simplifying this a lot but it's the general idea.
> There are lots of solutions out there.  Just look up software defined
> radios and dongles and find some drivers that will stream the data.
> 73 Tom
> va2fsq.com
> 
> 
> 
> -----Original Message----- From: Jim Miller
> Sent: Monday, November 20, 2017 2:32 PM
> To: Tom
> Subject: Re: [Elecraft] Digitized IF over IP?
> 
> Remote panadapter
> 
> Jim ab3cv
> 
> On Nov 20, 2017, at 2:23 PM, Tom <tomb18 at videotron.ca> wrote:
> 
> Hi,
> The questions is why?  What are you trying to achieve? Tom
> va2fsq.com
> 
> -----Original Message----- From: Lynn W. Taylor, WB6UUT Sent: Monday,
> November 20, 2017 2:14 PM To: elecraft at mailman.qth.net Subject: Re:
> [Elecraft] Digitized IF over IP?
> Latency is going to be a huge problem.
> 
> 73 -- Lynn
> 
>> On 11/20/2017 11:05 AM, Jim Miller wrote:
>> Has anyone digitized the K3s IF and streamed it over an IP connection?
>> 73
>> Jim ab3cv
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