1. On page B64 <4>, enter desired clock events in the timer reference field for both B:DDSSWT and B:DDSCTG. Note: B:DDSCTG should also have events $11 and $12 in the reference field. Enable both parameters.
2. Remove the above clock events from B:FSLKON. (Note: If running on new VCO for all beam cycles just disable B:FSLKON.)
3. Injection frequency is now controlled by B:VFINJ rather than B:INJFRQ
on these cycles.
VXI parameters should be set as follows:
B:VFINJ 37908936 Hz tune as needed
Parameters that also affect the digital frequency source, but should
not need to be tuned include:
B:VCDLY 2100 m sec
B:VFRSTP 4 unit
B:VFIDR 500 m sec
B:VAPLGN 12 unit
To return to old VCO:
1. Disable B:DDSSWT.
2. Re-enable B:FSLKON by entering the desired beam events into the timer reference field, including the $11 and $12 events. Use B:INJFRQ to tune injection frequency.
If there are problems with the DDS, Bob Webber should be informed.