[VHFcontesting] My rover antenna upgrade plan

[Ray J]

Remember EMT conduit is "made" to be bent easily..
1" x 10 feet long is easily taco'd by hand
1" usually has less than a 1/16th inch wall.
but if you are only going to have 4.5 feet of it out with a moxon on 
it.. its probably going to live


Also I think they sound like small antennas if you are not planning on 
rotating them.. 12' booms should be easily doable.. buy anything is 
waayyy better than nothing...

pic from my rover 1 experience so far..
http://www.w9ray.org/modules/gallery/albums/rover/0488_G.jpg


Ray J
w9ray
EN44GT
160m-13cm




k4gun at comcast.net wrote:
> I'm already plotting improvements to my rover rig for June.  After the January contest, I learned a lot of lessons.  I need better antennas.  That means I also need better masts.  I've been looking at what a lot of other people are doing and have come up with a solution that meets my goals of simplicity and ruggedness.  Its also quick to deploy and should be fairly effective.  Keep in mind, this is for the "limited rover" class which means 4 bands and low power.
>
> First, I need two telescoping masts.  After a lot of searching, I can't find any commercially made masts that do what I need.  After looking at Home Depot, I settled on building my own out of EMT conduit pipe.  The inner section will be 10' long and 1" in diameter.  The middle section will be 5.5' and 1.25" in diameter and the base will be 5' long and 1.5" in diameter.  There will be two pins to lock the pieces in place in both the lowered and extended points.  The upper section has 4.5' of mast space for antennas.  
>
> The masts will be mounted in the bed of my truck.  They will be attached to the steel tool box and a cargo divider in the bed.  That will give 4 mounting u-bolts for each one and that should be pretty solid.  I will also guy the lower 5' section to the inside of the truck bed.  In this configuration, the lowest antenna would be 9' off the ground in the lowered position and 18' fully extended.  The highest antenna would be at 13' at the lowest and 22' fully extended.  All figures are a little conservative to account for spacing of the overlap of the tubes.
>
> The antennas I'm going with are the following:  6 meters is a Par Stressed Moxon, 2 meters is the M2 2M7 (7 element, 8'8" boom), 222 would be from M2 in the 222-7EZ (7 element 5'8" boom) and an M2 420-50-11 (11 element 5' boom).  Everything would be oriented forward and I would use the truck to rotate the thing.
>
> My question becomes about stacking order.  I have about 4 feet of mast space to work with on each mast.  My thought was to put the 6 meter at the top of one and the 432 on the top of the other.  That would allow me to stagger them so they didn't come too close to each other either vertically or horizontally.  I'm very open to hearing alternatives to this.  
>
> I will also have a single mast mounted to the trailer hitch with halos for 50, 144 and 432 for use while moving.  
>
> So what says the group?  Obviously, everything is a compromise of performance versus portability and ruggedness.  I'm trying to walk a line that gets me as good a signal as possible while not causing me problems from overly complex or cumbersome systems.
>
> Thanks for any suggestions.
>
> Steve
> K4GUN
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