[Dave, Jeff, Erik]

In support of efforts to eliminate noise caused by duotone, a new version of the "gpstime" driver was installed that enables control of the duotone output from the timing card and of the duotone relay on the ADC adapter board.

When the relay is opened, the duotone channel reads near zero volts, with some bit noise. 

When the duotone output is turned off, the timing card outputs a steady -16768 counts.

To control these features you must be logged in as root on h1omc0

the command 'dt_output' controls the duotone output from the timing card.

the command 'dt_relay' controls the relay. 

turn either on or off like so

'dt_relay on'

'dt_relay off'

to get the current state, run the command without an argument.

For both commands, 'on' means duotone is on.

Both have to be on for duotone to work.