Hi Dan,
We have done integration times from 20ms upto a second. There are bursts
that last for hours, minutes and a few ms to seconds as well.
We have not tried AGC on these bursts since we were aiming to study them
only. In the 8 bit design, we had 3 bits for background and remaining 5 to
hi mugundhan,
what's the time scale for these bursts?
rise and fall times?
can you use a AGC circuit (automatic gain control),
eg: computer controlled attenuator
to turn down the power going into the ADC during the bursts,
so you could keep the levels going into the ADC relatively constant?
if
Hi Dan,
Usually quiet sun doesn't show such abrupt changes, but bursts do (easily
40-50dB or more) for bright bursts. We have built 8 bit spectrometers in
40-80Mhz, but have found then when the burst is pretty strong, saturation
effects starts kicking in.
Thanks,
Mugundhan
On Wed, 5 Feb 2020,
hi colm,
regarding dynamic range
-
for your solar spectrometer, do you need 14 bits of ADC dynamic range?
it's very unusual in radio astronomy to need that much instantaneous
dynamic range on the input.
does the sun vary on short time scales in the radio band by
Dear Colm,
I think you may find the bandwidth is the issue in this case. The Red
Pitaya (10 bit and 14 bit) seems to only have an input 50MHz (3dB)
bandwidth, so you would only get 10-50MHz bandwidth (total bandwidth of
40MHz). There is also a 16 bit version, but I suspect it has a similar
Hello CASPER people,
We are looking to build a spectrometer with not too demanding requirements.
Based on the specs below, would the Red Pitaya be up to the job do you
think?
Or, is there another, better suited (but similarly affordable) solution?
Chanel widths: ~< 100 kHz
Time sampling: ~<
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