[Antennaware] 40M Yagi Problem

[K7LXC at aol.com]

In a message dated 11/18/03 9:03:28 AM Pacific Standard Time, 
antennaware-request at contesting.com writes:

> There is definitely something wrong as I have NEVER yet seen a European =
>  which is as strong on both antennas fed in phase as the upper one by =
>  itself.  The bottom one by itself is down by something like 5-10 DB on =
>  the long haul stuff (guessing, comparing the two antennas) which is =
>  okay.  Have not put up a dipole to see if it is any better than that.

Hi, Stan --

    Long time no see. How are you doing?

    My guess is that the antennas are being fed out-of-phase. Lots of 
cancellation when that happens and the stack never works right. Try reverse jumpering 
the coax in the shack and see what happens.

    I don't know why you've got a double dip. Sounds like some destructive 
interaction. What kind of antenna is it? What happens if the bottom antenna is 
90 degrees from the top one? Are the two antennas identical?

Cheers,
Steve     K7LXC
TOWER TECH --
Professional tower services for commercial and amateur