Hi Xavier
I understand your problem -- we face similar impulsive RFI at the ATA.
You are trying to "observe through" the periods of RFI, hence need a lot
of bits. A method we sometimes use is to "blank" the spectrometer output
if the input signal exceeds a certain threshold. When the RFI is
John,
We use these picoPSU modules exclusively for powering our roach2
systems. They have 120W capacity and are powered from +12VDC.
http://www.mini-box.com/s.nl/it.A/id.417/.f
So far they've been great.
Good luck!
Jason
On 12/8/2017 1:18 PM, John D. Sahr wrote:
I have an application
I have an application for a ROACH-2 which will be powered from 12V rather
than 120 VAC, and I need to find some appropriate DC-DC converters.
I can see what the TC-1U20FX2 power supply module is capable of, but I'm
trying to find out what the ROACH2 actually needs.
(*) I haven't been able to
Hi All -
Van Vleck corrections definitely apply to spectrometers. We used them for the 3
and 9 level GBT spectrometers, before VEGAS, which uses the ASIAA 5 Gsps ADCs.
Fred Schwab did most of the work on this, which strangely seems to be best
documented on Jeff Hagen's web page:
On 12/08/2017 01:04 AM, Jean Borsenberger wrote:
I knew that correlators could operate using only the sign bit trough
the van-vleck correction and total-power denormalization, but I did
not know that this also applies to spectrometers. I will look into it.
"To the extent of my (imperfect)
Hello,
In Nançay, we deal with such high RFI, with a 8bits ADC. We
experienced no problem. It is to be noticed anyhow that we work with
analog filters that almost completely cut low frequencies, and have a
usually a smoother edge for hi freq. For some observations, we have
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