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Originally acquired for the CASIMIR instrument intended for SOFIA, a new FFT spectrometer (FFTS2) is now available with the wide band heterodyne receivers. At present, FFTS2 has two IF modules and four FFT modules. Each IF module divides a 4 GHz wide IF band (4-8 GHz) into two 2 GHz sub bands. In turn, each sub band is sampled with 8192 channels by an FFT module. The FFTS2 can be operated simultaneously in parallel with the other FFT spectrometer, FFTS1.
|Signal processing||Non windowed FFT|
|Sub band width||4 x 2000 MHz|
|Channels||4 x 8192|
|Channel spacing||269 kHz [0.350 km s−1 at 230 GHz]|
TELESCOPEfield identify the four sub bands:
CSO FFTS 2B1,
CSO FFTS 2B2,
CSO FFTS 2B3, and
CSO FFTS 2B4. The sub bands are connected to the wide band receivers as follows:
|Receiver|| Sub |
| Barney |
UIP> SPECTROMETER /FFTS2
UIP> SPECTROMETER /FFTS2 0.2 -0.2
/CENTERoption or by using the
/RANGEoption. For example, with FFTS2B3 connected to the 460 GHz receiver,
UIP> five_point 10 /range 16385 24576 /ffts2
draw killcommand in CLASS.
LAS> @ cso_clean_ffts2 N