[TowerTalk] 40m optibeam de-coupling stubs

[StellarCAT]

|Dave's model was for the 2el 40m coil loaded OptiBeam and I concur with hispost. The 40M4LLDD is a different animal, its 15m resonance was previously posted |by N2IC.http://lists.contesting.com/archives//html/Towertalk/2015-09/msg00315.html John KK9A

so.... not knowing WHAT effect I’ll have with a 40M4LLDD mounted 30’ above a 6el/15 (and then another one 45’ below the first one) ... and knowing now that the 40M4LLDD is most definitely resonant in the 15 meter band which would generally cause pattern issues... I’m seriously thinking of rotating the 40 yagi 90 degrees to the other antennas (this is a rotating tower)... 

The 40 would be mounted just above a guy point ... anyone have any knowledge of issues that might come about due to such a change? I’m not sure what the impact would be on wind loading ... its generally understood to rotate the elements inline with the wind – so if I do that on the 4 monobanders I’ll still have the elements of the 40 perpendicular to the wind (as well as the rotated 80/75 dipole at the top)... and I’ve found that wind can change enough that keeping any particular part of the antennas inline is a crap shoot – and if one is not at home or has lost power when a high wind situation comes up its moot as well... but I’m curious if anyone has any mechanical expertise on such things – if there is anything I might be overlooking or need to consider in making such a change. I’ll model the boom of the 40 (51’) to be sure it wouldn’t then impact the 20 or even the 15 as well... other than that I think it should work. 

Since my 80/75 is rotated 90 degrees to the tower I’ll already have provisions for a rotor direction change ... and 40 and 80 are often similar propagation so it might work out well in that regards. I’d be thinking about having 180 degrees (south) as the rotor center point and the 40 then set at 270.... so when the main main antennas (20/15) will go from LP AS,  SA, through AFR, MID-EAST, EU, all of Asia and most of the pacific ... from stop to stop. The 40 would start from VK/ZL through to JA and below... 

Gary 
K9RX