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CX2SA > SATDIG 13.08.13 21:03l 304 Lines 9879 Bytes #999 (0) @ WW
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Sent: 130813/1901Z @:CX2SA.SAL.URY.SA #:9791 [Salto] FBB7.00e $:AMSATBB8263
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Antenna element and Boom material (Mike Hoblinski)
2. Re: Rotator Positioning questions (Ing. Pavel Milanes Costa)
3. Re: LO-19 on again (Pete Rowe)
4. Audio of SO-50 pass August 11 at around 1150 NY time?
(Ing. Pavel Milanes Costa)
5. Re: Antenna element and Boom material (Greg D)
6. Problems (Martha)
----------------------------------------------------------------------
Message: 1
Date: Mon, 12 Aug 2013 13:09:31 -0700
From: "Mike Hoblinski" <hobergenix@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Antenna element and Boom material
Message-ID: <8845E2014C8346AABB0697DFA40F66A6@xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I was looking at constructing a Log Periodic antenna and was wondering
about useing square material instead of round elements. The plans call out
1/4 round hollow tube for the elements. I ran across some aluminum extrusion
material from a company called Microrax http://www.microrax.com/ that sells
small aluminum extrusion and brackets plus hardware.
Their extrusions are 10mm square and come in legnths up to 35 inches. I was
looking at going with some larger extrusion material for the boom. All of the
extrusion material has nice channels cut into it that could be used for
element
spacing adjustment and easy mounting. My other thought was to tap the ends of
the elements and add stainless steel screws to adjust the legnths.
I am wondering about going from 1/4 inch tound elements to about 3/8 inch
square
would effect the performance of this antenna.
Mike Hoblinski
N6IMF
------------------------------
Message: 2
Date: Mon, 12 Aug 2013 18:29:07 -0400
From: "Ing. Pavel Milanes Costa" <co7wt@xxxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Rotator Positioning questions
Message-ID: <520961B3.6010806@xxxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I Greg, et all.
The rotor has a mechanical switch that cut the power to the motor when
it's in contact with the switch:
So stopped motor is ZERO Current...
About 450 and beyond...
You are right, but last days I was thinking/tweaking an algorithm that I
think now will do the math..
I will code it in this next days... You will know about it...
73 and thanks for your tips/comments.
El 10/08/13 02:23, Greg D escribi?:
> I forget... Do these kinds of motors change their current draw
> significantly when they stall? If they don't, a current probe may not be
> a reliable stop indicator.
>
> Also, regarding the challenge with 450 degree rotation... There's no
> requirement that you actually use all 450 degrees. Just stick to 0-359
> and it will make things a lot easier to start with. Once it's all
> running, you can go for the fancy stuff.
>
> Good luck with the project,
>
> Greg KO6TH
>
>
> Ing. Pavel Milanes Costa wrote:
>> The "motor running/motor stop" signal will be a current probe on the
>> AC 24V motor feeding wires down the control, as when the motor reach
>> 0o or 450o it automatically switch's off
>
------------------------------
Message: 3
Date: Mon, 12 Aug 2013 15:41:47 -0700 (PDT)
From: Pete Rowe <ptrowe@xxxxx.xxx>
To: Jean-Pierre Godet <godetj@xxxxxxx.xx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: LO-19 on again
Message-ID:
<1376347307.40615.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
LO-19 was very strong here in San Jose California for the 12 Aug 13? 21:36
UTC pass.
https://www.dropbox.com/s/ud4t6e5krmnrm3r/LO19b.jpg
73,
Pete
WA6WOA
________________________________
From: Jean-Pierre Godet <godetj@xxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Sent: Monday, August 12, 2013 6:37 AM
Subject: [amsat-bb] Re: LO-19 on again
? ? Hi Ib, Dimitry, everyone,
? Pass of orb. 23049 (AOS 1143 UTC) and 23050 (AOS 1322 UTC) was heard as
previously (before yesterday blackout).
? Sound:
http://f5yg.pagesperso-orange.fr/forum/LUSAT_(LO-19)_orb23049_12aug2013.mp3
? RX:
http://f5yg.pagesperso-orange.fr/forum/13081201.jpg
? Ant:
http://f5yg.pagesperso-orange.fr/forum/12072502.jpg
? Best 73 my friends !
? J-P/F5YG
--
Powered by Linux (Slackware 10.0 - kernel 2.4.26)
On Mon, 12 Aug 2013, Dimitry Borzenko wrote:
> Hi all.
> I confirm, heard LO-19, only dashes at 10:06 UTC strong signal!
>
> Regards.
> de 4z5cp
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Ib Christoffersen
> Sent: Monday, August 12, 2013 11:39 AM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] LO-19 on again
>
> hello all,
> This morning at 0828 UTC it was back on with the very strong signal.
> Dots and Dashes at random.
> Sorry if this is a double posting. Had some problems.
> 73 OZ1MY
> Ib
>
>
> _______________________________________________
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Mon, 12 Aug 2013 18:44:11 -0400
From: "Ing. Pavel Milanes Costa" <co7wt@xxxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Audio of SO-50 pass August 11 at around 1150 NY
time?
Message-ID: <5209653B.7080205@xxxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi to all, I have my homebrew crossed yaguis working again, prof of that
is the pass of the last Sunday august 12 around 1150 Havana/NY time...
The cell phone (record device) trick me and did not record anything...
so if anyone has the recording of that pass I will appreciate if you
share it with me, I make at least 4 QSO... plase email it to me...
An in the rest of august I will try to be on every night pass until the
17 and from august 17 to september 1 I will be QRV on as may passes
(Vacations!!!)
So if you need FL11 write me and I will make a schedule for you.
This night there is 2 chances, I will be QRV on the first at the ~2040
Havana/NY time (0040Z)
I'm with the yagui in one hand the mic on the other... so be patient and
spell your call as slow as you can...
73 de CO7WT.
------------------------------
Message: 5
Date: Mon, 12 Aug 2013 19:48:07 -0700
From: Greg D <ko6th.greg@xxxxx.xxx>
To: Mike Hoblinski <hobergenix@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Antenna element and Boom material
Message-ID: <52099E67.2030808@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Mike,
Yes, the length of the elements will be affected. Fatter elements look
electrically longer, I think, so they may need to be shortened a bit to
compensate for a shift in frequency. Impedance may be affected as well.
You will also need to keep the same mounting scheme, as to whether the
elements are insulated from the main boom or not.
But, experimenting is what it's all about. Build it and see how it
performs. Adjust. Do it again. You will end up with a good antenna,
and a practical knowledge of how to build it, when you're done. Then
let us know how you did it.
Good luck,
Greg KO6TH
Mike Hoblinski wrote:
> I was looking at constructing a Log Periodic antenna and was wondering
> about useing square material instead of round elements. The plans call out
> 1/4 round hollow tube for the elements. I ran across some aluminum extrusion
> material from a company called Microrax http://www.microrax.com/ that sells
> small aluminum extrusion and brackets plus hardware.
>
> Their extrusions are 10mm square and come in legnths up to 35 inches. I was
> looking at going with some larger extrusion material for the boom. All of
the
> extrusion material has nice channels cut into it that could be used for
element
> spacing adjustment and easy mounting. My other thought was to tap the ends
of
> the elements and add stainless steel screws to adjust the legnths.
>
> I am wondering about going from 1/4 inch tound elements to about 3/8 inch
square
> would effect the performance of this antenna.
>
> Mike Hoblinski
>
> N6IMF
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Tue, 13 Aug 2013 10:48:24 -0400
From: Martha <martha@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Problems
Message-ID:
<CAPk0USw8U78u_3Ed_cmfiJM0sMNcD6vPJLn9eFPtytb-Fg=6DQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Due to new postal regulations, our mailer had to buy new software. As some
of you know, there was a glitch. The right address but the wrong name
appears on your Journal. I have spoken to the mailer and was assured that
everyone received a Journal. So disregard the name and enjoy the magazine.
--
73- Martha
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 263
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