Frequencies, 20191121
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The 10 MHz reference from the faulty Rubidium standard in the Tx-hall
was sent down to the control room using the DDS-multiplexer and compared with the
local independent 10 MHz using the Thandar frequency counter.
It measured 10000.0185 kHz
So all frequencies transmitted recently are too high by about 1.85 10-6.
I am not sure how long this has been, but maybe since July 2019 
when we noticed that the Rubidium standard had failed.


20200214
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The 10 MHz reference frequency for the exciters in the tx-hall was changed
from the faulty SRS Rubidium standard to that from the Symmetricom GPS 
clock in the heater control room. An unused RG213 cable between these buildings
was used with an isolating transformer in the control room. An ouput from
the 10 MHz distribution unit was the source, and the yellow labelled cable
previously used for one of the receiver channels from array-3 was used
as a reliable cable. The sinusoidal wave at the transmitter hall was strong,
and feed into a power splitter with one output going to the DDS reference 
distribution unit, and the other output going to the Ettus USRP receiver rack.