L1LBW1 Testing
Mode 4
- 32k channels
- chan_bw 3433 Hz
- center_frequency 750.0MHz
- tone ~701 MHz
- I would predict the tone to be in 2111, I see it in 1238 (or something else very prominent).
- Something is there, but nearly as strong as Mode 5:
- Data file: 2013_12_30_16:17:19H.fits
Tone in channel 2111 ? |
|
Mode 5
- 65k channels
- chan_bw 2861 Hz
- center_frequency 750.0MHz
- tone ~701 MHz
- I would predict the tone to be in 15641
- Data file: 2013_12_30_15:39:20H.fits
Tone in channel 15641 |
|
Mode 6
- 131072 channels
- chan_bw 1430.5 Hz
- center_frequency 750.0MHz
- tone ~701 MHz
- I would predict the tone to be in 31283
- Data file: 2013_12_30_16:31:52H.fits
Tone in channel 31283 |
|
Modes 7-9
Not enough bandwidth to see the 701MHz tone.
Mode 10 (L8LBW1)
- 32k channels
- chan_bw 715.25 Hz
- center_frequency 700.01 MHz
- tone ~701 MHz
- I expect the tone in channel 17782, looks like its in 19147. Nothing at all at 17782.
- Something like a 980 KHz difference.
- Data file: 2013_12_30_16:56:02H.fits
Mode 23 (L8LBW8)
- 32k channels
- chan_bw 715.25 Hz
- center_frequency 700.01 MHz (subband 0)
- tone ~701 MHz
- I expect the tone in channel 17782, looks like its in 19148. Nothing at all at 17782.
- Something like a 980 KHz difference.
- Data file: 2013_12_30_17:13:27H.fits
Mode 2
As a sanity check, try checking the tone using mode 2 as a reference.
- 16k channels
- chan_bw 91553 Hz
- center frequency 750 MHz
- tone ~701 MHz
- I expect the tone to be in channel 7657. There it is right on 7657.
I can't explain the reason for l8 mode oddness, even including the 'actual' LO frequency, the feature isn't landing where I expect it to.
I also don't know why Mode 4 didn't show the line stronger, as it is usually relatively strong.
--
JoeBrandt - 2013-12-30