[amsat-bb] 70 cm Lindenblad progress - notable support structure for parasitic elements

[Fernando Ramirez]

PLA won't last long under Arizona's heat. A better choice would be PETG,
ABS or ASA (best choice).

73
Fernando, KF7R






On Wed, Sep 23, 2020, 1:14 PM Chris Thompson via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> This looks great.  I look forward to seeing the STL and design files.
> BTW PLA held up well for 3D printed antenna parts in Brooklyn NY.  It might
> melt elsewhere, but given the melting point is about 180C and it only got
> to about 40C on my roof, the 3D printed parts were fine.  I had them up
> through winter and summer for many years.  It seems UV resistant.  While
> squirrels have access to the roof, they could not get to the 3D printed
> parts, so that was not an issue.
>
> 73
> Chris
>
> On Wed, Sep 23, 2020 at 12:33 PM E.Mike McCardel via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
> > Curt,
> >
> > Your whole process and experimentation of these would make for an
> > interesting AMSAT Journal article.
> > If you have the time, please consider writing it up. Pictures included.
> >
> > E. Michael McCardel, AA8EM, former KC8YLD
> > Former Senior Editor for AMSAT News Service,
> > Past VP Educational Relations for AMSAT-NA
> >
> > Have you donated to get your Fox-1 Challenge Coin Yet?
> > http://www.amsat.org/?p=3275
> >
> >
> > On Tue, Sep 22, 2020 at 8:46 PM Curt Laumann via AMSAT-BB <
> > amsat-bb at amsat.org> wrote:
> >
> > > Hi All,
> > >
> > > Over the past few months I've been designing & assembling a few 70 cm
> > > Lindenblads.  The current version is shown in the attached picture
> (link
> > > below).  Arrow shafts are used for parasitic elements.  The shafts are
> > > bonded in place with fiberglass resin.  Rubber end caps (from McMaster)
> > > cover the shaft ends.
> > >
> > > The notable part of this design is the central structure (supporting
> > > parasitic elements) is 3D printed as *one part*.  Virtually all of the
> > > angles and spacings are achieved in the 3D printing process.  After
> > > struggling to align and bond various PVC and irrigation parts in other
> > > versions, it was a breeze to assemble this design:  one nylon machine
> > > screw, one nut, four bonding points.
> > >
> > > The design could be easily modified to accommodate 0.125 inch diameter
> > > parasitic elements as well.
> > >
> > > Regards,
> > >
> > > Curt / K7ZOO
> > > Tucson AZ
> > >
> > >
> > >
> >
> https://drive.google.com/file/d/1i2c6T5lZtI00KChbJuyphvvechzBvlNw/view?usp=sharing
> > > _______________________________________________
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> > > expressed
> > > are solely those of the author, and do not reflect the official views
> of
> > > AMSAT-NA.
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> > >
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
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> >
>
>
> --
> Chris E. Thompson
> chrisethompson at gmail.com
> g0kla at arrl.net
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>