Opened 17 years ago
Closed 17 years ago
#10 closed task (fixed)
frequency channels convention
| Reported by: | MatthewWhiting | Owned by: | MatthewWhiting |
|---|---|---|---|
| Priority: | major | Component: | pvoconvert: FITS access |
| Version: | Keywords: | ||
| Cc: |
Description
There is a little confusion over the correct convention to use for the way the frequency channels are defined (ie. the DAT_FREQ array). Currently, the i-th channel is FREQ_CHAN1 + i * CHANBW, so that if CHANBW is positive, the frequencies increase with increasing channel number. It may be that this is incorrect, and they should decrease with channel number (ie. go from highest to lowest frequency).
This needs to be confirmed.
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The way it is set up appears to be fine. The confusion probably came from examining files where the CHANBW was negative. Leaving the setup the way it is, and closing the ticket.
MW.