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There are 4 backends which can be individually connected to any
- The 1 MHz filterbanks, consisting of 4256
channels each. The four parts can be combined to give a 1 GHz (4256
MHz) wide filterbank (at present only usable with 230G2, no other backend
can be connected to 230G2 in this case), or two filterbanks of 512 MHz each.
Any shift of the four subbanks relative to each other is also
possible in steps of 32 MHz. Each part can be connected to a different (or
the same) receiver.
- The 100kHz filter bank, consisting of 256 channels of 100 kHz
(splittable into two halves movable inside the 500 MHz instantaneous
bandwidth, and connectable to two different receivers)
- The 500 channel AOS: ( Under repair)
Bandwidth 500 MHz; actual spectral
resolution 1.5 MHz. Using the AOS with the 3 mm SIS receiver results
in higher noise at the band edges, so the combination 3 mm SIS + AOS
is not recommended.
- The autocorrelator: The software treats the autocorrelator
as one unit although physically it consists of two identical machines.
The following numbers are to be understood for the complete autocorrelator
Available resolutions are 10,
20, 40, 80, 320 and 1250 kHz. The bandwidth is between 20 MHz and
MHz, depending on resolution. The correlator can be split into 8
independent subbands, each of which can be configured individually and
connected to the same or different receivers. For the larger
bandwidths (i.e. more than one subband of 80 MHz) a problem of
platforming may exist (i.e. baselines from the different subbands have
slightly different levels).