For those who may not
look on the Ya-BOO group , I started a
discussion over using a simple ADC for
LF/MF .. turns out there are linux
drivers for the ezeycap sdr dongle to
run directly on LF/HF , with NO
analogue convertor . but as yet , no
windows version ..
This post from Alberto
follows the idea with a suggestion to
use a instrument ADC , to configure a
0 > 1 MHz SDR RX with minimal components
73 -G..
--- In
rsgb_lf_group@...,
Alberto di Bene <dibene@...> wrote:
>
> Thinking about an SDR
receiver meant for the 0..1 MHz band, a possible,
> minimal hardware-wise
realization could perhaps be that of using an Analog
> Devices AD-7760
ADC, with its superb SNR, sampling at 2.5 MHz, 24 bits,
> followed by a
Cypress FX2 chip to implement a USB dialog with the PC.
>
> No FPGA
nor DDC would be needed. The hardware would then send
> a 2.5 MHz stream
of digitized data to the PC, which will process them
> with, e.g. Winrad.
Winrad is quite capable of coping with such data rate.
> In this very
moment I am listening with Winrad and the Elad FDM-S1
> receiver to a
local MW station, and the FDM-S1 is set for a final output
> frequency
(after its DDC) of 3072 kHz. So 2.5 MHz would be a breeze for
>
Winrad.
>
> If somebody designs and builds such a hardware,
I am more than willing to
> write an ExtIO DLL to interface Winrad with
it.
>
> 73 Alberto I2PHD
>
Alberto,
Well that's a most
interesting idea !, checking on e-bay , the two chips are
about £18 the pair
. that only leaves the slight problem of the design
However .. there is a
development board + support for the ADC
http://www.analog.com/static/imported-files/eval_boards/EVAL-AD7760_7762EDZ.pdfBut
as to how much of it is 'actually' needed for this application
remains to be
seen ..
But what ever the outcome , it would be a true 0>1 MHz Rx with
very little
problems, compared to the problems of the 'race to DC' from the
analogue
converter option's !
73 -G.
