Discrepant $T_{sys}$ Values

In the event that there is an antenna with $T_{sys}$ values vastly different from the norm, there is a possibility of several underlying problems. Be aware that there are two types of $T_{sys}$ values displayed by CAMON: the raw values and the calculated values.

	CHECK both the raw and calculated $T_{sys}$ values on CAMON:
	$>$ /tsys		For raw $T_{sys}$.
	$>$ /arr		For calculated $T_{sys}$.

If the calculated values are different from their corresponding raw values then this could indicate a problem with your CACAL, as the calculated values use the CACAL calibration.

CHECK ``factors'' that CACAL calculated when last run.

	$>$ /fe1		For frequency 1.
	$>$ /fe2		For frequency 2.

If the factors are too high (normal $\sim$ 1) then you may have to run CACAL again:
XBONES$ cacal
Select interactive mode (I) and reset the gains.

If the factors are okay and the temperatures are still too large, make sure that it is not a problem of the CAMON window by typing:
$>$ redraw

If symptoms persist, there could be a problem with the cyrogenic system on the antenna:
CHECK the cryo page on CAMON.
$>$ /cr

If the pump supply is approximately the same as the pump return, then there has most likely been a cryogenics failure and an alarm will have been sounded in all the on-site houses. CONTACT THE DUTY ASTRONOMER IMMEDIATELY!

Alternatively, the problem may be due to some part of the receiver-IF chain. Use CAMON to investigate the receivers.

E.g., to inspect Antenna 3:

$>$ /rx/3

This shows the receiver hardware status of antenna 3.

For a menu of other receiver pages:
$>$ /0

If in doubt seek help from your Duty Astronomer.