| |
CX2SA > SATDIG 23.09.20 20:20z 800 Lines 27384 Bytes #999 (0) @ WW
BID : AMSATBB15385
Read: GUEST
Subj: AMSAT-BB-digest V15 385
Path: HB9ON<IW8PGT<IZ3LSV<DB0ERF<DB0RES<ON0AR<OZ5BBS<CX2SA
Sent: 200923/2018Z @:CX2SA.SAL.URY.SOAM #:40367 [Salto] FBB7.00e $:AMSATBB15385
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Elections (Clint Bradford)
2. Re: Regarding election results, How many members does AMSAT
have? (E.Mike McCardel)
3. 70 cm Lindenblad progress - notable support structure for
parasitic elements (Curt Laumann)
4. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Stefan Wagener)
5. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Paul Andrews)
6. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Curt Laumann)
7. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Zach Metzinger)
8. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Paul Andrews)
9. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (E.Mike McCardel)
10. Re: 3D printing (was 70 cm Lindenblad progress) (Steve Kristoff)
11. Re: 3D printing (was 70 cm Lindenblad progress) (Paul Andrews)
12. Re: 70 cm Lindenblad progress - notable support structure for
parasitic elements (Chris Thompson)
----------------------------------------------------------------------
Message: 1
Date: Tue, 22 Sep 2020 05:21:50 -0700
From: Clint Bradford <clintbradford@???.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] Elections
Message-ID: <D45353C6-F25B-4AC5-82A1-610E4F4C9B44@???.???>
Content-Type: text/plain; charset=utf-8
BOB>> ? [someone else] also ran so this move by me doesn't leave AMSAT
without a second alternate.
The electorate spoke. It is YOU who was needed. Please reconsider - and
serve AMSAT-NA in
that capacity. Please do NOT let the choice of the voters slip away ?
Clint Bradford K6LCS
------------------------------
Message: 2
Date: Tue, 22 Sep 2020 09:15:38 -0400
From: "E.Mike McCardel" <mccardelm@?????.???>
To: Bruce Perens <bruce@??????.???>
Cc: Michael Tondee <mat_62@???????.???>, AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Regarding election results, How many members
does AMSAT have?
Message-ID: <2FAC493C-C70D-4F76-8826-9F3B05D6D0D2@?????.???>
Content-Type: text/plain; charset=utf-8
Bruce,
Who is the ?We? you suggest. ORI?
Just to remind everyone one of your previous comments:
?Perhaps nothing indicts the agenda Of ?The Team? than This quote from Bruce
Perens.
?I am not convinced that I need to spend my time on convincing anyone at
AMSAT. At some point it becomes less effort to simply let AMSAT die and
carry on the work elsewhere.??
This seems to be the agenda right along.
Personally I can live in a world with more than one amateur radio group or
amateur radio satellite group. Especially when one has an historical records
of putting satellites into space and the other doesn?t.
EMike McCardel, AA8EM
Past Senior Editor AMSAT News Service
Past AMSAT-NA VP Educational Relations
Former ARRL, Ohio Section, Affiliated Club Coordinator
> On Sep 21, 2020, at 6:15 PM, Bruce Perens via AMSAT-BB
<amsat-bb@?????.???> wrote:
>
> ?I think we should open a mailing list on the ORI side for satellite
> operators. Because obviously AMSAT isn't the only US satellite
> organization, so you shouldn't have to feel alienated out of a piece of
> your hobby just because AMSAT makes a choice. I'll get that done and then
> announce it. There already is the "ground station" mailing list where most
> engineering discussion takes place.
>
> Thanks
>
> Bruce
>
>
>> On Mon, Sep 21, 2020, 1:45 PM Michael Tondee <mat_62@???????.???> wrote:
>>
>> Is that a matter of public record? Looking at the vote totals of the
>> election is what made me ponder the question. I'll be quietly moving on
>> now and enjoying other aspects of the ham hobby but I'm really curious
>> what your membership totals are and what the percentage of turnout was
>> for what was such an important election.
>>
>> 73,
>>
>> Michael, W4HIJ
>>
>>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
------------------------------
Message: 3
Date: Tue, 22 Sep 2020 17:44:18 -0700
From: Curt Laumann <curt.laumann@?????.???>
To: AMSAT-BB@?????.???
Subject: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAD7_4hwz-vKobAkZoAs5hFwn8M4zy+hzbJCmWarS=axQ=69GvQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
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=sha
ring
------------------------------
Message: 4
Date: Tue, 22 Sep 2020 20:07:42 -0500
From: Stefan Wagener <wageners@?????.???>
To: Curt Laumann <curt.laumann@?????.???>
Cc: AMSAT BB <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAKu8kHDEmq==5b0D9QRPE12fv=z7T=Yh5BRX894rUFdhAL0z1w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Very nice! Will you make the STL file available?
73 Stefan, VE4SW
On Tue, Sep 22, 2020 at 7:46 PM Curt Laumann via AMSAT-BB <
amsat-bb@?????.???> 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=sha
ring
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
------------------------------
Message: 5
Date: Tue, 22 Sep 2020 21:09:47 -0400
From: Paul Andrews <w2hro.fn20@?????.???>
To: Curt Laumann <curt.laumann@?????.???>
Cc: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAOsf+NS0Fn-qvZQs1NJ-=7oE=F-_Ay+v_xKLrhRZidmmOjJehQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Can you share the 3D printing files? Which material are you using?
73 - Paul - W2HRO
On Tue, Sep 22, 2020, 20:46 Curt Laumann via AMSAT-BB <amsat-bb@?????.???>
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=sha
ring
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
------------------------------
Message: 6
Date: Tue, 22 Sep 2020 18:24:52 -0700
From: Curt Laumann <curt.laumann@?????.???>
To: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAD7_4hxFWDrhbBAvW1Nk7nNe-u5ttF-Co3JOSauS2Fyex3V8OQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Sure Stefan, et al, I'd be happy to share the STL file. I used FreeCAD and
will make those files available as well. I'm sure others can further
improve the design.
I printed this part out of eSun PLA+, but a better choice for outside use
might be PETG.
Regards,
Curt / K7ZOO
Tucson AZ
On Tue, Sep 22, 2020 at 6:07 PM Stefan Wagener <wageners@?????.???> wrote:
> Very nice! Will you make the STL file available?
>
> 73 Stefan, VE4SW
>
> On Tue, Sep 22, 2020 at 7:46 PM Curt Laumann via AMSAT-BB <
> amsat-bb@?????.???> 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=sha
ring
>> _______________________________________________
>> Sent via AMSAT-BB@?????.???. 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
>>
>
------------------------------
Message: 7
Date: Tue, 22 Sep 2020 20:52:25 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID: <180a5a8c-43f6-9e93-0226-9a9ea0968791@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 09/22/20 19:44, Curt Laumann via AMSAT-BB wrote:
> 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.
Hello Curt,
It appears you and I had the same thought.
Look for an upcoming article, already submitted, in the AMSAT journal
about my design. The OpenSCAD source files and STL files will be available.
--- Zach
N0ZGO
------------------------------
Message: 8
Date: Tue, 22 Sep 2020 23:45:16 -0400
From: Paul Andrews <w2hro.fn20@?????.???>
To: Curt Laumann <curt.laumann@?????.???>
Cc: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAOsf+NTVU2NQKcKRQxGeHF-PuJW6wqXO9zyFWH=ZPrkdgqms-w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I built a patch feed for 1296 MHz and a folding fabric dish using many 3D
printed parts. I have some experience testing parts under stress in hot
weather.
PLA is great for prototyping but will fail quickly outdoors and then be
eaten by squirels and deer. :0
Nylon is strong but softens significantly in heat.
ABS or PETG are UV stabile and relatively heat resistant. PETG is great
because it prints straight and strong.
3D printing will be a game changer for ham antenna builders.
73 - Paul - W2HRO
On Tue, Sep 22, 2020, 21:27 Curt Laumann via AMSAT-BB <amsat-bb@?????.???>
wrote:
> Sure Stefan, et al, I'd be happy to share the STL file. I used FreeCAD and
> will make those files available as well. I'm sure others can further
> improve the design.
>
> I printed this part out of eSun PLA+, but a better choice for outside use
> might be PETG.
>
> Regards,
>
> Curt / K7ZOO
> Tucson AZ
>
> On Tue, Sep 22, 2020 at 6:07 PM Stefan Wagener <wageners@?????.???> wrote:
>
> > Very nice! Will you make the STL file available?
> >
> > 73 Stefan, VE4SW
> >
> > On Tue, Sep 22, 2020 at 7:46 PM Curt Laumann via AMSAT-BB <
> > amsat-bb@?????.???> 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=sha
ring
> >> _______________________________________________
> >> Sent via AMSAT-BB@?????.???. 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
> >>
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
------------------------------
Message: 9
Date: Wed, 23 Sep 2020 12:08:26 -0400
From: "E.Mike McCardel" <mccardelm@?????.???>
To: Curt Laumann <curt.laumann@?????.???>
Cc: Amsat - BBs <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAM5+souhheP34pJOWYOhDH3fJvmt6ppRLUyevb8nXorFQQ_pEA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
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@?????.???> 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=sha
ring
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
------------------------------
Message: 10
Date: Wed, 23 Sep 2020 12:17:49 -0400
From: "Steve Kristoff" <skristof@???????.???>
To: "AMSAT BB" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] 3D printing (was 70 cm Lindenblad progress)
Message-ID: <4655db97395b6fc3e1815ca66770d6de@???????.???>
Content-Type: text/plain; charset=UTF-8
I am pretty ignorant with respect to 3D printing, but this question just
popped into my head. Is there any kind of electrically conductive material
that can be used for 3D printing so you could print the actual antenna?
Steve AI9IN
?
----- Original Message -----
From: Paul Andrews via AMSAT-BB (amsat-bb@?????.????
Date: 09/23/20 11:05
To: Curt Laumann (curt.laumann@?????.????
Cc: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
I built a patch feed for 1296 MHz and a folding fabric dish using many 3D
printed parts. ?I have some experience testing parts under stress in hot
weather.
PLA is great for prototyping but will fail quickly outdoors and then be
eaten by squirels and deer. ?:0
Nylon is strong but softens significantly in heat.
ABS or PETG are UV stabile and relatively heat resistant. ? PETG is great
because it prints straight and strong.
3D printing will be a game changer for ham antenna builders.
73 - Paul - W2HRO
------------------------------
Message: 11
Date: Wed, 23 Sep 2020 13:27:20 -0400
From: Paul Andrews <w2hro.fn20@?????.???>
To: Steve Kristoff <skristof@???????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] 3D printing (was 70 cm Lindenblad progress)
Message-ID:
<CAOsf+NSMCfnguLCFLkzCPpc==Ef4MWHt91XFQEQxg9b6PQhZ_w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
There are plastic filaments for 3D printing that contain conductive
material. They are conductive but probably not as good as aluminum and
certainly not copper. There are highly conductive acrylic paints that can
be applied the the exterior of printed parts.
I have read research about printing waveguide and applying silver paint.
The results were good.
I have printed antenna parts and applied adhesive copper foil. This can
work well. Copper foil is cheap.
73 - Paul - W2HRO
On Wed, Sep 23, 2020 at 12:40 PM Steve Kristoff via AMSAT-BB <
amsat-bb@?????.???> wrote:
>
> I am pretty ignorant with respect to 3D printing, but this question just
> popped into my head. Is there any kind of electrically conductive material
> that can be used for 3D printing so you could print the actual antenna?
>
> Steve AI9IN
>
>
> ----- Original Message -----
> From: Paul Andrews via AMSAT-BB (amsat-bb@?????.????
> Date: 09/23/20 11:05
> To: Curt Laumann (curt.laumann@?????.????
> Cc: AMSAT-BB@?????.???
> Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
> structure for parasitic elements
>
> I built a patch feed for 1296 MHz and a folding fabric dish using many 3D
> printed parts. I have some experience testing parts under stress in hot
> weather.
>
> PLA is great for prototyping but will fail quickly outdoors and then be
> eaten by squirels and deer. :0
>
> Nylon is strong but softens significantly in heat.
>
> ABS or PETG are UV stabile and relatively heat resistant. PETG is great
> because it prints straight and strong.
>
> 3D printing will be a game changer for ham antenna builders.
>
> 73 - Paul - W2HRO
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
------------------------------
Message: 12
Date: Wed, 23 Sep 2020 16:09:36 -0400
From: Chris Thompson <g0kla@????.???>
To: EMike McCardel <mccardelm@?????.???>
Cc: Amsat - BBs <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] 70 cm Lindenblad progress - notable support
structure for parasitic elements
Message-ID:
<CAJOf0+tqK8Lo9VCs01dyZL1xyw80qL+_hQjmKF3oC7fe4htm7Q@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
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@?????.???> 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@?????.???> 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=sha
ring
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. 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
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
>
--
Chris E. Thompson
chrisethompson@?????.???
g0kla@????.???
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
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 member? Join now to support the amateur satellite program!
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 15, Issue 385
*****************************************
Read previous mail | Read next mail
| |
