[50mhz] Stacking interaction with 15 & 20 monobanders?

[Peter Markavage]

I have my 7 element M2(31 foot boom) 6M beam approx. 7 feet (give or take
a couple of inches) above my System 1, 5 element Tri-bander for several
years with no problems. Prior to the M2  for about 20 years, I used a KLM
7 element beam on a 20 foot boom. No problems with that one and the
tri-bander. At one point, I also had a stack pair of these 6 M KLM's,
with the tri-bander below them and a 220 and 432 beam nested between the
stacked pair of 6 meter beams. No loss in 6 meter performance with all
this extra metal around.

Pete, wa2cwa

> ----- Original Message ----- 
> From: "N3XX - Tim Heger" <n3xx at charter.net>
> To: <50mhz at mailman.qth.net>
> Sent: Tuesday, July 08, 2008 7:56 PM
> Subject: [50mhz] Stacking interaction with 15 & 20 monobanders?
> 
> 
> Looking for opinions on possible interaction if I mount a 6 Mtr yagi 
> between 
> my existing 15 and 20 Mtr 5 element monoband yagis on the same mast. 
>  The 15 
> and 20 Mtr yagis are 11 ft. apart on the mast, and I would be 
> mounting the 6 
> Mtr yagi midway between them.  So about 5.5 ft. distance to either 
> of the 
> yagis above and below.  The 6 Mtr yagi would be 5 elements, on an 18 
> ft. 
> boom.  Would like another element or two, but don't want to add too 
> much 
> more wind load to the mast with the additional boom length.
> I'm afraid the other antennas would be too close, and possibly the 6 
> Mtr 
> yagi wouldn't perform well in this configuration, but trying to save 
> on the 
> additional money that would be spent to rotate the antenna with a 
> side mount 
> arrangement on the tower.
> I guess I could just go ahead and put it up there and see what 
> happens.  It 
> could always be moved if there is a problem.
> Or, maybe someone has a good low cost solution to antenna rotation 
> with a 
> side mount.  The TIC rings are nice, but would be spending about 3 
> or 4 
> times more for the rotator than was spent for the antenna.
> 
> Thanks - 73,
> Tim - N3XX