This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
operations:documentation.ivs.mark5mode [2016/04/15 10:29] Nick Ham Removed 4 redundant spaces |
operations:documentation.ivs.mark5mode [2018/02/27 05:19] Warren Hankey |
||
---|---|---|---|
Line 1: | Line 1: | ||
+ | |||
+ | |||
For VSI recording, 1-bit sampling and 8 MHz bandwidths (e.g. R1 and R4 experiments): | For VSI recording, 1-bit sampling and 8 MHz bandwidths (e.g. R1 and R4 experiments): | ||
<code>mk5=mode=ext:0x55555555:2</code> | <code>mk5=mode=ext:0x55555555:2</code> | ||
Line 31: | Line 33: | ||
Recall that the conversion to binary from the hexadeximal number: | Recall that the conversion to binary from the hexadeximal number: | ||
- | * ''5'' is ''0101'' (?which indicates one-bit sampling?); and | + | * ''5'' is ''0101'' (which indicates one-bit sampling); and |
- | * ''f'' is ''1111'' (?which indicates two-bit sampling?). | + | * ''f'' is ''1111'' (which indicates two-bit sampling). |
One-bit sampling uses the sign of recorded voltages when recording, two-bit sampling partitions the interval of possible voltages up in to ''4'' pieces to obtain sign and magnitude components. | One-bit sampling uses the sign of recorded voltages when recording, two-bit sampling partitions the interval of possible voltages up in to ''4'' pieces to obtain sign and magnitude components. | ||
Line 40: | Line 42: | ||
* ''0xffffffff''. | * ''0xffffffff''. | ||
- | <note>(need to note which way around the channels are ordered).</note> | + | <note>Channels 1-8 are X-band upper sideband (USB) from BBcs 1-8, channels 9 and 10 are the X-band LSB channels of BBCs 1 and 8, and channels 11-16 are S-band USB BBCs 9-14.</note> |
===== <decimation ratio> ===== | ===== <decimation ratio> ===== | ||
Line 59: | Line 61: | ||
<note>FPDP stands for Front-Panel Data Port.</note> | <note>FPDP stands for Front-Panel Data Port.</note> | ||
+ | |||
+ | ====== Sampling Rate ====== | ||
+ | Recall that the nyquist rate is the minimum rate at which a signal can be sampled without introducing errors, which is twice the highest frequency present in a signal. Consequently, the __sampling rate__ is double the maximum bandwidth per channel (which the decimation ratio determines). | ||
====== Mark5 Data Recording Rate ====== | ====== Mark5 Data Recording Rate ====== |