[evlatests] Systemic Switched Power Troubles

[Ken Sowinski]

On Thu, 28 Oct 2010, Rick Perley wrote:

>    Ken ran a test for me yesterday, intended to check system
> sensitivities at L, S, C, and X bands.
>
>    A quick review of the data shows that two antennas give *no*
> switched power at any of these bands.  These are:

To clarify, data is present but is merely noise with zero mean.
This could happen if NT switching at the antenna is off by 25 msec.

>    Antennas 10 and 24.   Both give what appears to be perfectly normal
> total power readings.  And both give perfectly normal fringes.
>
>    It is also noted that antenna 12, in IF 'B' gives a 'square wave'
> pattern in its switched  power at all four bands -- the amplitude of the
> pattern is about 4%, and the pattern changes every 10 seconds.

This must be happening in the station board if only one IF
shows the signature.