[evlatests] Frequency Tuning at L-band

[Barry Clark]

Just to clarify - the signed sum of LOs, which appears in your observe
script, appears in the center of channel zero, which is the first
channel in your dataset.

Rick Perley wrote:
>     Michael et al. arranged to observe our 'standard L-band interferors' 
> with 125 kHz resolution. 
> 
>     He provided me the correct tuning values, stating that these 
> corresponded to the bottom edge of the first spectral channel. 
> 
>     With this, I find that all the standard interferors are located 
> exactly 188 kHz too high (that is, 1.5 channels). 
> 
>     If, for some reason, the canonical frequencies correspond to the 
> midpoint of the lowest channel, then all interferors are 125 kHz -- or 
> one full channel -- too high. 
> 
>     Note that in the earlier experiment, with 500 kHz resolution, the 
> offset was 250 kHz -- one/half of one channel (using the interpretation 
> that the sub-band frequency listed corresponds to the center of the 
> first channel). 
> 
> 
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