If you can find a length of tubing one size larger (so that the pieces
to be repaired just barely fit inside); cut a length long enough to
provide lateral strength (side load), cut slits into the ends of the
patch lengthwise then overlay that to 'mend' the two pieces (make it
continuous again) and use worm gear clamps on the slits to bind it
together (making sure that the original two parts are close so you don't
have to trim to resonance).
The overlaid section will be stronger than the original (two layers) if
you do this correctly and have a long enough patch (which will depend on
the overall length since length gives leverage).
Some will suggest also adding conductive grease on the elements
overlapping. Other may also suggest adding two (at each end) small
bolts at 90 degrees to each other to back up or replace the clamps
(belts and suspender mode). I don't suggest bolts as they're hard to
realign next time and reduce the amount of material needed at the patch
(makes it weaker).
I've also (because it was available) taken fiberglass rod and put that
INSIDE the two aluminum ends, with bolts to keep it in place and a clamp
to span any distance between the ends. It worked but isn't as
electrically sound.
I would not use a pop rivet, it's not bonded hard enough to the elements
(you'd still need an overlaid section), isn't strong enough over time
and could create a weak enough contact point for RFI later. Brazing
also brings in a dissimilar metal and creates even more issues.
GL es 73,
Rick NK7I
On 3/16/2020 10:06 AM, Fred Jensen wrote:
#3
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 3/15/2020 3:01 PM, [email protected] wrote:
I have a vertical antenna to repair and install that I believe is the
same
as or close to a hi-gain AV-18HT.
https://www.hy-gain.com/Product.php?productid=AV-18HT.
The main antenna vertical was cut so it could be taken down. I
purchased it
used in hopes I could repair and install it.
I have two different places that require repair. Purchasing new parts
for
the element appear to approach the cost of an entirely new antenna.
I'm thinking of three different methods of repair but lack experience.
1. I can braze the elements using aluminum brazing rods and flux.
2. I can get them welded back together but am concerned that the
tubing is
very thin.
3. I can try to find tubing of sufficient size to put inside and then
pop-rivet/braze the pieces together.
What do you folks suggest?
Thanks in advance. I've collected about a fourth of the wire
necessary for
the radials.
Jerry D. Moore
AE4PB
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