[CQ-Contest] Stacking of two towers -any experiences?

[SM0HRP Kari Gustafsson]

Hi to all,

Winter is approaching and I did not make it in time for a vertical stack. 

I have two towers with a JK2015 (5 el on 15 and 20 meters) and JKmidtri (4
el on 15,20 and 10 meters ) respectively on each tower. I have a Stackmatch
II for 20 meters and a StackMatch II Plus for 15 meters prior HP BP filters.
Then I use the PB2 and PB3 Hamation controllers to steer the phasing and
combinations (1,21+2 or 1-2).  

I would like to test horizontal stacking. Now when I use 1+2 on 20 m I
notice a slight signal reduction (broadside towards Japan) compared to just
anyone of them (they become out of phase a bit).  I could of course
introduce phase delays to the coaxial lines on 20 m and 15 m to get them in
phase in some directions? Towards USA they would be in line but towards
Japan and South America they would be broad side. I have no clue of what the
coax cable lengths are. 

Anyone that has made some experimenting with a similar set up and two
towers?  Of course I could add a phase box with I believe 6-9 coax lines
that could be switched into the either feeder line that I could use. Other
ideas?

 

Best 73s Kari SM0HRP/SM0D