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Re: [TowerTalk] MonstIR vs Monobander..K4XS/KH7XS (long)

To: <>,"'reflector -tower'" <>
Subject: Re: [TowerTalk] MonstIR vs Monobander..K4XS/KH7XS (long)
From: "Mike Fatchett" <>
Date: Fri, 9 Mar 2007 19:11:44 -0700
List-post: <>
Good points Bill.

>From Colorado I was very loud into the Caribbean with a dipole at 60ft.
Central America or Carib into the states does not require tall antennas.  We
made some huge numbers from V47M in the 80's with a 40m 2 ele beam that was
25 to 30 ft off the ground.

Good luck with your project!

Mike W0MU 

-----Original Message-----
[] On Behalf Of
Sent: Friday, March 09, 2007 7:03 PM
Subject: [TowerTalk] MonstIR vs Monobander..K4XS/KH7XS (long)

In a message dated 3/10/2007 12:25:04 A.M. Greenwich Standard Time, writes:

I was  just reading the 3830 results from last weekend's contest and I saw
interesting comment by 6Y1V / KY1V.   The 
6Y1V station has stacked SteppIR MonstIR antennas and on a separate  tower
stacked monobanders for 10m, 15m and 20m.  The monobanders were  2 to 3 S
units stronger than the SteppIRs.

Check the quote from the site:
The rotating tower supports 6 M2 Inc. long boom mono  band yagis. On 20
meters we have 6/6 on 59' booms at 100' and 50'. On 15 meters  we have 6/6
on 44' 
booms at 65' and 32'. On 10 meters we have 7/7 on 44' booms  at 55' and 28'.
The MonstIRs are something like 135 over  70. 
The spacing is beautiful for 40 meters, but for  20 meters using 32 foot
booms that spacing is way is too  great.  The problem is compounded on 15
and 10.  
It's no surprise the  SteppIRs were pounded by the monobanders.
In Florida I used 5/5 at the same spacing for 20, 6/6 at  the same spacing
for 15, and 6/6 at the same spacing that the 6Y guys are  using.  The stacks
kicked butt.
The three things working against the SteppIRs here  are:
1. Less than optimal  spacing...too great for 20 with the boom length and
especially 15 and 10 to  generate much gain
2. Probably too high for stateside.   The angles generated by the SteppIRs 
would be way too high for east coast  and much of the west side (6Y is not
that far from FL, and those heights  rarely worked east of the Mississippi
3. The monobanders are going to develop more gain all  things being equal,
because of boom length.
What we have here is the problem I am facing in  designing the stacked
SteppIR system...picking the compromise height.  The  thing missing in the
6Y SteppIR stack is the ability to fill in the  "hole" between 135 and 70
and between 70 and ground level.  If that was  done we might have a closer
horse race.  
I'll put my money on a four high  stack of SteppIRs at 135/100/70 and 35 for
20/15 and 10.  That's close to  what I am going to do at KH6.
Mine is still a work in progress until I get the OK from  the building
department since the tower will be anywhere up to 150 feet of Rohn  55.
Until then I will keep doing terrain analysis courtesy of  N6BV.
By the way, I'd like to hear (off the reflector) from  other guys who have
used SteppIRs in stacks.
Bill  K4XS/KH7XS
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