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aluminium tubing , part dux :)

B

BOOTY MONSTER

Guest
ive got my money and ive made up my mind . i am going to build a better base antenna , not buy one . i can get the tubing i need for the verticle from Aluminum Tubing Type 6063 - 6 ft. as suggested by some folks here ;) . i had a good discussion with marconi about it yesterday (thanks eddie) while he pointed out a few things i hadnt really considered or knew about , im still gonna do it . not at all suggesting he was saying i shouldnt , he was just sharing more of his experience so that if things dont go according to plan that i have a few ideas about how to compensate .

im basically gonna make the wizardo " Vertical Gain CB Antenna"
Tips and tricks on how to build your own CB Antennas.

antenna2.gif


the few changes are gonna be using 1 inch aluminium strip from lowes for the coil . its 1/8 thick/thin and 8 foot long . wizardo specifies 6 feet of wire . ill be using something with a much larger surface area so i may have to adjust the final length of that . im thinking to copy the shape in the pic with that length to just start with 6 ft 3 inches . the extra is two inches to play with to attach to the verticle and one for the foot of the bottom for ground element connection also . come out about 9 inches and carefully and neatly make a 17 1/4 inch circle . 72 inches - 2x9 = 54 . 54 /by 3.14 = 17.197---- inches . maybe add a 17 inch non metalic rod straped to the back of the mounting plate and securing the to the tuning ring on the sides for added stability .

the mounting plate will either be a 3 foot peice of recycled solid plastic lumber 5/4 board (not trex or a composite!) or the fiberglass handle from a shovel . the ground plane will essentially be the same , ill just use the ground element rig i currently have on my 1/4wgp .
WHOLEANTENNA.jpg

BELOWANTENNA.jpg


yes i will be going to metal for mast , im still a little up in the air about grounding/isolating the antenna . im also thinking of a simple red-neck-engineered spring or rubberband and string way to check fully grounding to no grounding . certianly wont help if lightning hits , but if i like it better grounded ill just pull it down and hard wire it .

and speaking of that im undecided on the top . just a simple plastic cap stuck on it would be easiest . but im toying with some top hat ideas . nothing huge and no i dont expect louder modulation or a flatter DA . but for being less attractive to lightning strikes by having a larger surface area at the top . i could just cut the remaining 2 feet of 1 inch strips to 1 feet and installl at the top in a X shape , use a file to smooth any sharp corners/edges . ive also thought of piching up a cheap SS or alum ash tray/shallow bowle and attaching it upside down on the top . and then theres my favorite two bowles together to make a giant ball top , and of course draw a window on it like the jupiter 2 from lost in space . hehehehehe
and yep what ever tophat/bowle i add to the top will shorten the length some .

finally i could get buy with what i need from DX for just $42.80 delivered (6 foot sections) using 3/8 , 1/2 , 5/8 and 3/4 tubing .

i want it to be really strong if im gonna build it and its only a few bucks more . im thinking of 1 1/8 . 1 1/4 , 1 3/8 and 1 1/2 inch for about $21 more delivered . im thinking it should be really strong and stiff .

and here again , the larger diameter/ surface area wil affect the final perfect length . from what i understand there shouldnt be more than a inch or so of difference in lengths . there also seems to be little if any real world differences between a 5/8 and a .64 antenna on cb channels . the coil hopefully wont be affected much either by the different size of it from the wizardo spec . if i recall correctly the maco 5/8 coil is about the same size and the verticle is a bit short for a 5/8 . anyhow , im confident i can get it to tune low enough for my needs , 1.3 or less is acceptable IMO . but if i can hit that magic 1.1 ill try . ;) .

anyhow , long post , sorry for that , but i appreciate yalls comments and suggestions . no doubt i have a plan , i think its a good one , what do yal think and suggest i try or do different .

thanks .
 

thanks HV . considereing we,ve bumped heads a few times i have to tip my hat to ya for the support . thanks ;) .

i ordered the tubing today , it'll be four 6 ft sections . all .058 wall pre-slit at one end .
1 inch
1 1/8 inch
1 1/4 inch
1 3/8 inch
i also ordered 3 of their nickle and SS clamps
$63.34 delivered , should be here monday or tuesday

Aluminum Tubing Type 6063 - 6 ft.

they suggested 4 inches or more for the overlap so i can do 23 feet or less on the verticles height .
 
If you want to check grounding/isolation v no grounding/isolation try adding a length of delrin rod the same diameter as your mast to the top of your mast to mount the antenna on booty,don't forget to ground the radio side of the choke's shield if using a dc grounded antenna.which will leave your lightning/static protection intact but still show high impedance to common mode current.

Delrin has excellent electrical insulation characteristics and is also a strong plastic.Its also relatively inexpensive and not to hard to machine.

Good luck with the antenna,I'm sure you'll do a sound job.
 
booty i emailed a place over here that sells 6061-t6 drawn tube,
i need 6ft of 1-5/8 x .058 and four 6ft pieces of 3/8 x .083 or 3/8 x .065
i want to use the same material as the rest of the sigma4 is made from if i can but very few places sell it, i would use 6063-t832 if i can find the right sizes,
its not looking good at these prices,

6061-t6 drawn tube priced in 3ft lengths,
Skycraft Ltd 6061-T6 Tube


there is little wonder antenna makers here use turkey foil.
 
bob , DX only has one of the sizes you mentioned that also meets you wall thickness spec . thats the 1 5/8 6 ft. .058 .
Aluminum Tubing 6' x 1.625

im gonna hold off on the top hat or ball top , maybe mess with it later . im just gonna focus on getting the thing up and tuned .
 
Bob, I've been pricing up at this place for a project I've got in mind..

Aluminium Warehouse

Prices don't seem too bad, but it's the £15 +vat on every order that is the killer :( You'd have to need a boatload of alli to make it worthwhile.

Another place you could try is Aluminium Extrusions by Simmal UK 0800 731 8238 extruded aluminium components, this is actually about 2 minutes drive away from my house, but they have recently changed their website, so you would have to either phone them or order a catalogue online from them.

I don't know if either of these places would be any cheaper for you Bob, but it may be worth a look.
 
cheers booty / simon, i will check that place out, if they dont have what i want i will end up using the 6063 from dx engineering, it will be strengthened in the critical parts with 6061-t6, im sure the dx engineering tube will be more than strong enough for my needs
 
my tubing and clamps arrived here about noon today . :) :) . and very fast to considering UPS here dont deliver over the week end . nicely packaged and the box is in good shape for those interested .

the walls are a little thicker than i imagined , but thats a good thing , it will be even stronger and sturder . ill go to lowes tonite or tomorrow and get the aluminium strip and some new stainless nuts and bolts . im gonna take the bottom and top section to see if i like the fit of the 3/4 or 1 inch wide aluminium strip better for the tuning ring on the bottom . and see if one of their copper endcaps might make a good cap for the top on just do a rubber table foot or pvc endcap .
 

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