On 11/28/13 6:27 AM, Chuck Harris wrote:
As far as I know it is L1 only. It is a Bullet II HE, P/N 25045-10,
the standard antenna specified in the Thunderbolt manual.
If you look closely, you will notice that what appears to be a
single soldered joint at the middle, is really two solder joints,
one on each of the sides of the preamp's PCB.
OK.. didn't see the double solder at the top, it looks like one in the
photo.
Each "V" has different length legs. The legs are drooped down to
where they are capacitively loaded to the ground plane.
So, what it is is two inverted V type dipoles in parallel, and
oriented at 90 degrees crossed.
And the classical approach of make one dipole a bit long and the other a
bit short to get the 90 degree phase shift needed for CP.
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