[CQ-Contest] Stacking on separate towers, take off angles?

[Rex Maner]

----- Original Message ----- 
Subject: Re: [CQ-Contest] Stacking on separate towers, take off angles?


> Mike
> At one time I had a pair of 10M yagi's  on separate towers stacked.  I did 
> not do the fancy adjustment of phasing line's , I had the beams North and 
> South of each other and adjusted the coax length to get about 3 db gain 
> when beaming East or West.  I was very happy with the results but never 
> did find band conditions to EU from Washington to really check them out.
>
> Some years ago there was quiet an article put together by the  OH guys on 
> horizonal stacking of 3 6el 20 M yagi's  at over 100 foot,  I don't 
> remember where it was but I think Old  CQ magazine.
>
> somone will find it for you, I found this but it might not be of much 
> help.
>
> http://www.grantronics.com.au/docs/StkYagis.pdf
>
> Rex K7QQ
>
>
> ----- Original Message ----- 
> From: "Mike" <ve9aa at nbnet.nb.ca>
> To: <cq-contest at contesting.com>
> Sent: Wednesday, March 13, 2013 10:15 PM
> Subject: [CQ-Contest] Stacking on separate towers, take off angles?
>
>
> Hello from  New Brunswick, Canada de VE9AA, Mike
>
>
>
> If anyone runs 'stacked' antennas on separate towers, I'd like to hear 
> what
> has been your experience  .
>
>
>
> I have 2 (self-supporting) tower bases, aprox 65-70' apart. (never 
> measured
> it-I put them in mni yrs ago)
>
>
>
> They run on a line about N-S (EU is NE from here and USA is SW); same as
> from W1.
>
>
>
> The North tower will have a CC A3S at the ~74' level and the South tower
> will have another A3S
>
> @ aprox the ~42' level.  I can tweak those heights a little bit if need 
> be.
> I'll have other antennas in the vicinity.
>
>
>
> I have good ideas about "stacking" them either with a Array Solutions WX0B
> Stackmatch II I already own, or something else I conjure up
>
> here allowing me U/L/BIP.even flip one 180º out of phase for BOP, I think
> coax phasing lines for a tribander might be a mess when attempting BOP, so 
> I
> may do a relay at one yagis feedpoint  if I go that route.. BUT...that's 
> not
> the problem. (or the question)
>
>
>
> My idea is to usually spray in 2 directions at a time when contesting,
> however certain contests require I beam only in 1 direction.
>
> WAG ( I beam Germany) .ARRL SS, 95% of the time, I beam SW or WSW..you get
> the idea.\
>
>
>
> I am relatively certain I can make a good guess of what the pattern will 
> be
> like when I beam due east or due west with both antennas.
>
> (again, towers are N-S from one another)
>
>
>
> The issue is when I put both antennas on EU or USA (NE or SW).  I am
> envisioning the elevation pattern will be messed up (as in out of phase 
> and
> thus HIGH,...good for E-skip or noon hour prop on 20m.. or else
> unpredictable(?) as the wavefronts are both arriving at different times to
> each antenna, thus they'll be out of phase once you get anywhere away from
> straight East or West (guessing a little here).
>
>
>
> Is there anything that can be done to counteract that, or even guess as to
> what it may be, or is it a total cr at pshoot?
>
>
>
> I've searched and searched and searched on the web and on contesting.com 
> and
> found mere snippets here and there where someone mentioned stacking 
> antennas
> on separate towers, but never if it was better when BOTH antenna were 
> aimed
> the same way. (I guess most times in a contest it's nice to cover 2
> directions) I just see where there is a need for general DXing for P5RS7,
> BS7H, KP1 or VU7 when you need to eek out every 10th of a dB or like I
> mentioned before, in contests where I am lucky enough to be in the far 
> North
> East to just leavem' parked NE or SW where I don't know what I'll be faced
> with.
>
>
>
> If anyone runs 'stacked' antennas on separate towers, I'd like to hear 
> what
> has been your experience  - J
>
>
>
> Comments? (even anecdotal is fine.I am not a scientist or engineer, just a
> technologist)
>
>
>
> 73, TNX !
>
> Dit dit, Mike VE9AA
>
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