[hpsdr] DFC

[Scott Traurig]

I would expect that local PTT and keying will follow the same form they
currently take in PSDR and Thetis, that is to say:

PTT--space bar, mouse or COM port (I use a foot pedal switch on a COM port
input myself)
Key--COM port input (CTS for dit or straight key, DSR for dah)

And, again, there would be no Ethernet involved, the DSP CCA being a PCIE
card and residing inside the PC. There would certainly have to be an
external radio unit containing the antenna switching, filtering and
amplification. I'd guess that this would be connected using I2C or SPI.

My understanding is that as long as a reasonably serious NVIDIA graphics
card is installed for video, sufficient CUDA processing elements can be
borrowed from it without affecting video functionality and without
requiring a second, dedicated GPU.

73,

Scott

On Thu, May 12, 2016 at 10:12 AM, ad0es <ad0es at ad0es.net> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> DFC in a nutshell:
>
> antenna > bandpass filter > pre-amp > ADC > CPU/GPU/software
>
> This speaks to the simplification of the RECEIVE portion of the problem.
> The xmit portion will remain similar to the current situation.
>
> There will be DACs etc. for xmit on the card.  There will be an FPGA on
> the card to run various functions.  But the FPGA will no longer do
> any of the FFT/DSP processing, greatly reducing its complexity.
> It probably wont have CODECs for speaker, the PC would provide
> those features via its soundcard. (will have some degree of support
> for mike/key on card, thats a question for Phil).
>
> FYI:  I am only involved in the CPU/GPU portion of the project, if I
> mis-spoke
> in any of my statements above, please correct me!
>
> Steve AD0ES
>
> On 05/12/2016 07:19 AM, Glen wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Oh, I must be confused.  It was my impression that DFC would
>> eliminate the need for the FPGA card.
>>
>> I 'assumed' the Cuda cores replace the FPGA processing, and the PC
>> was used for everything else.
>>
>> I also 'assumed' the daughter DFC card on the video card has the DDC
>> DUC hardware on it.
>>
>> I would guess it would not have CODECs on it for mic and speaker.
>>
>> Hence, the need for more info! ;-)
>>
>> 73
>>
>> Glen K4KV
>>
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