On 05/26/2018 03:23 AM, Vinand Prayag wrote:
Hi Dan,
The downconversion was the first idea that we had before Prof Inggs
steered us towards the SNAPs. I made a quick costs overview:
If each channel cost $100. Total cost for 48 is $4800. PCIe ADC with
16channels at 1MSPs will come at $500 each. Three of these will be
$1500. Add to that the cost of three mainframes which would be around
$1500 as well plus the need of a switch(1GbE 24 channels is atleast
$2000). This should bring the total cost to $9800.
Four SNAPs will come around $14000 at $3500 with much less complexity.
There is a $4000 difference and this is one of the reasons I am
seeking out the CASPER group in case someone can get us the SNAPs at a
reduced price. I may have forgotten to mention that while we are only
building a one station pathfinder, the plan is for 20 or so stations
which will give us over a 1000 channels. The added advantage of using
something like the SNAP is that I get to expose the radio astronomy
community to SDR and FPGA development and once the experiment is over
the SNAP can be reused for any other experiment. Prof Inngs and I
agreed that to build expertise for hosting SKA type telescopes it is
essential we get started with what the astronomy community is using.
Cheers,
Vinand
I just read over some design-review discussions.
There was discussion of substantial roll-off in the analog inputs above
200MHz. Is that still the case?
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