[evlatests] Antenna 5 Bandpass

[Dan Mertely]

Certainly about the right length (~100 ft for
1/2 wavelength).  There are a lot of other
splices and connectors along the way, however.
In addition, the tap was a -10 dB hybrid as a
splitter, going into 2 of the old blue Miteq
L-band post amps (in series) via a isolator,
before hitting the long stretches of 1/2 inch
heliax.  The main (EVLA) signal path shouldn't
have seen any back reflections through all that!
-Mert


Ken Sowinski wrote:
> On Mon, 10 Oct 2011, Rick Perley wrote:
> 
>>    ea05, in RCP, shows a fine-scale frequency ripple -- only 5 MHz!
>> This is seen in both amplitude and phase, consistent with a reflection
>> of length ~30 meters!  This fine ripple is seen only in this antenna, in
>> that one polarization.  The amplitude of the ripple is quite small:
>> pk:pk less than 5% (and about 2 degrees in phase).   This length is
>> certainly longer than anything in the antenna optics or normal signal
>> path.
> 
> About the length of a cable from the vertex room to
> a connector at the gound?
> 
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