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CX2SA > SATDIG 13.03.14 20:03l 684 Lines 21695 Bytes #999 (0) @ WW
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Sent: 140313/1903Z @:CX2SA.SAL.URY.SA #:4259 [Salto] FBB7.00e $:AMSATBB990
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Question for the antenna gurus (i8cvs)
2. Re: W1AW/7 satellite activity from Arizona has started!
(Patrick STODDARD (WD9EWK/VA7EWK))
3. Re: Circular and elliptical polarization question. (i8cvs)
4. AO-73 deaf ? (Peter Wilson)
5. Re: AO-73 deaf ? (g0mrf@xxx.xxxx
6. W5PFG/p (Wyatt Dirks)
7. Re: Question for the antenna gurus (Gus)
8. Re: Question for the antenna gurus (kc6uqh@xxx.xxxx
9. Re: Question for the antenna gurus (i8cvs)
10. Re: Question for the antenna gurus (Gus)
11. DSTAR net (wa4hfn@xxxxxxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Wed, 12 Mar 2014 21:49:59 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Gus" <gus@xxxxx.xxx>, <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Re: Question for the antenna gurus
Message-ID: <001f01cf3e34$a39360c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Gus, 8P6SM
Mounting 3 turn helix antenna for 2400 MHz concentrically
inside a 3 turns helix antenna for 1268 MHz was used as a
feed both wounded LHCP to illuminate a ground station prime
focus dish for RHCP uplink and downlink on Mode-L/S for
AO40 and it worked very well.
If you plan to build a 10 turns RHCP helix antenna for 70 cm
conentrically into a 5 or 6 turns RHCP helix antenna for 2 meters
in my opinion it should work as well but the weight of this
antenna will be very very hight and not practical to be used in
comparison with yagi antennas.
73" de
i8CVS Domenico
----- Original Message -----
From: "Gus" <gus@xxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Sent: Wednesday, March 12, 2014 9:33 AM
Subject: [amsat-bb] Question for the antenna gurus
> Regarding axial-mode helix antennas, what happens if you build a helix
> for each of two different bands (like 2M/70cm), and mount them
> concentrically, on the same backplane?
> --
> Gus 8P6SM
> The Easternmost Isle
> _______________________________________________
> 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: 2
Date: Wed, 12 Mar 2014 14:04:50 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: W1AW/7 satellite activity from Arizona has
started!
Message-ID:
<CAN6TEUeVN8b2Pwms-EBMbqE9GkEuZDTtfyRFtEVQXTNDdTZfoA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Damon,
Thanks for the compliment. I, along with John working from
his K8YSE/7 station here in central Arizona, are trying to
keep W1AW/7 on lots of passes over the next few days. I
hope we can work you at some point over the next few days,
and possibly work you a few times. I'll be on again later
tonight, including a couple of AO-73 passes for those
staying up late.
73!
Patrick
On Wed, Mar 12, 2014 at 6:20 AM, damon runion <damonwa4hfn@xxxxx.xxx> wrote:
> Patrick
> Its good to see that there is someone on this BB that still works the
> birds. I have worn the paint off my delete button with the 400 cub sats and
> all the worthless junk that has been taking the place of real satellite
> operator activity.
> Damon
>
>
>
>
------------------------------
Message: 3
Date: Wed, 12 Mar 2014 22:34:27 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Douglas Phelps" <dphelps1@xxxxxxxxx.xxx>, "AMSAT BB"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Circular and elliptical polarization question.
Message-ID: <003101cf3e3a$d8b687e0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Douglas Phelps" <dphelps1@xxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Sent: Wednesday, March 12, 2014 2:10 AM
Subject: [amsat-bb] Circular and elliptical polarization question.
I read in 'The Satellite Handbook' that I can mount to linear yagis side by
side (and at right angles) and I will get elliptical polarization. My two
questions are:
HI DOUG, K9DLP
IF THE ANTENNAS ARE AT RIGHT ANGLES YOU WILL GET CIRCULAR POLARIZATION AND
NOT ELLIPTICAL POLARIZATION.
1. Is their a formula or rule of thumb that will tell me how elliptical (or
non circular) the waveform will be as a factor of the separation between the
two antennas? (I would expect that the greater the separation the more
elliptical the waveform(farther from circular)).
CIRCULAR OR ELLIPTICAL POLARIZATION DO NOT DEPEND BY THE SEPARATION OF TWO
IDENTICAL ANTENNAS BUT MORE IS THE GAIN OF THE ANTENNAS AND MORE THE
SEPARATION YOU NEED.
2. I would think that the closer the better. I know when you mount two yagis
next to each other, in the same plane, there is a minimum separation
distance to prevent the antennas from affecting each other but with cross
polarization intending circular polarization, the closer the better. Does
this make sense?
NO ! CIRCULAR OR ELLIPTICAL POLARIZATION DEPENDS ONLY FROM THE POINT OF VIEW
THAT YOU LOOK AT THE LOBE RADIATED BY THE ANTENNA .
IN A SEPARATE EMAIL I HAVE SENT TO YOU THE ARTICLE "THE ADVANTAGES OF
CIRCULAR POLARIZATION" BY K4KJ THAT EXPLAINS THE ABOVE:
AS AN EXAMPLE, IF YOU STAND IN FRONT OF A FULL PHONOGRAPH RECORD DISK YOU
WILL LOOK A FULL CIRCLE (CIRCULAR POLARIZATION) BUT IF YOU ROTATE SLOWLY THE
DISK BY 90? YOU WILL LOOK AT FIRST AN ELLIPSE (ELLIPTICAL POLARIZATION) AND
THAN A STRAIGHT VERTICAL LINE (LINEAR VERTICAL POLARIZATION)
73" DE i8CVS DOMENICO
The reason I am asking is that I want to mount arrow antennas with the same
element sets at right angles and offset a quarter wavelength, with the
correct phasing harness and the WRAPS AZ/EL to create a portable auto
tracking satellite setup that can be disassembled and easily moved. Yes, I
know the VHF offset will be wrong for UHF but I intend to re-drill the UHF
antenna holes so that both the VHF and UHF will be offset a quarter
wavelength.
The matching system used by arrow does not allow the crossing of the same
wavelength antenna on the same boom.
I would appreciate and advice from those that are more competent with
antenna theory than myself.
Doug K9DLP
_______________________________________________
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: Wed, 12 Mar 2014 21:57:07 -0000
From: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-73 deaf ?
Message-ID: <000001cf3e3e$0365a040$0a30e0c0$@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I tried to work AO-73 this evening at 21:35 UTC from UK.
Normally with an overhead pass I have a very good signal to/from the
satellite - tonight, nothing.
This is not the first time I have seen this - anyone else seeing this?
Peter
G8KEK
------------------------------
Message: 5
Date: Wed, 12 Mar 2014 19:05:06 -0400 (EDT)
From: g0mrf@xxx.xxx
To: protest@xxxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-73 deaf ?
Message-ID: <8D10C5EA48D6142-638-6540@xxxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Peter.
I've sent you a private e-mail about the UK radar on 70cm, but I've just
looked at the telemetry
for the last pass and it shows a lot of transponder activity over Europe.
It may be that the AGC was being suppressed by high power signals.
The satellite is coming over to the west in about 15 minutes, I'll have a
look at the passband then. - It's usually much quieter after 23.00 UTC
Thanks
David G0MRF
-----Original Message-----
From: Peter Wilson <protest@xxxxxxxxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Wed, 12 Mar 2014 22:01
Subject: [amsat-bb] AO-73 deaf ?
Hi all,
I tried to work AO-73 this evening at 21:35 UTC from UK.
Normally with an overhead pass I have a very good signal to/from the
satellite - tonight, nothing.
This is not the first time I have seen this - anyone else seeing this?
Peter
G8KEK
_______________________________________________
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: Wed, 12 Mar 2014 18:45:37 -0500
From: Wyatt Dirks <wyattdirks@xxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] W5PFG/p
Message-ID: <BAY179-W20EC8CAB1B4CF53F0B7C91CD760@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Just talked to w5pfg and he asked me to post that he was going to be on the
upcoming 0008utc pass of fo29 and the following vo52 pass from DM70. He also
said he was going to try to operate from DM80 tomorrow evening.
73 Wyatt
AC0RA
------------------------------
Message: 7
Date: Wed, 12 Mar 2014 21:20:09 -0400
From: Gus <gus@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Question for the antenna gurus
Message-ID: <532107C9.3050701@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks for all info, Dom.
to construct a large (2M) helix with light weight, a non-traditional
design of some sort might be tried. Perhaps paint the helix on the
surface of an inflatable cylinder, with conductive paint?
Also, what if the coils/turns are something other than circular? perhaps
rectangular or triangular?
The brain has been tossing out crazy ideas recently, but in my
experience, crazy ideas are not always crazy...
On 03/12/2014 04:49 PM, i8cvs wrote:
> Hi Gus, 8P6SM
>
> Mounting 3 turn helix antenna for 2400 MHz concentrically
> inside a 3 turns helix antenna for 1268 MHz was used as a
> feed both wounded LHCP to illuminate a ground station prime
> focus dish for RHCP uplink and downlink on Mode-L/S for
> AO40 and it worked very well.
>
> If you plan to build a 10 turns RHCP helix antenna for 70 cm
> conentrically into a 5 or 6 turns RHCP helix antenna for 2 meters
> in my opinion it should work as well but the weight of this
> antenna will be very very hight and not practical to be used in
> comparison with yagi antennas.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Gus" <gus@xxxxx.xxx>
> To: <AMSAT-BB@xxxxx.xxx>
> Sent: Wednesday, March 12, 2014 9:33 AM
> Subject: [amsat-bb] Question for the antenna gurus
>
>
>> Regarding axial-mode helix antennas, what happens if you build a helix
>> for each of two different bands (like 2M/70cm), and mount them
>> concentrically, on the same backplane?
>> --
>> Gus 8P6SM
>> The Easternmost Isle
>> _______________________________________________
>> 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
>
>
--
Gus 8P6SM
The Easternmost Isle
------------------------------
Message: 8
Date: Wed, 12 Mar 2014 20:23:19 -0700
From: <kc6uqh@xxx.xxx>
To: "'Gus'" <gus@xxxxx.xxx>, <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Re: Question for the antenna gurus
Message-ID: <003301cf3e6b$94c3dac0$be4b9040$@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Gus,
As long as one is twice or more the frequency of the other it should work
fine. If you are using them as a feed for a dish the phase center of each
one must be considered for best focus.73,
Art,KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Gus
Sent: Wednesday, March 12, 2014 1:33 AM
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Question for the antenna gurus
Regarding axial-mode helix antennas, what happens if you build a helix for
each of two different bands (like 2M/70cm), and mount them concentrically,
on the same backplane?
--
Gus 8P6SM
The Easternmost Isle
_______________________________________________
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: 9
Date: Thu, 13 Mar 2014 06:42:22 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Gus" <gus@xxxxx.xxx>, <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Re: Question for the antenna gurus
Message-ID: <001301cf3e7f$02254780$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Gus" <gus@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, March 13, 2014 2:20 AM
Subject: [amsat-bb] Re: Question for the antenna gurus
> Thanks for all info, Dom.
>
> to construct a large (2M) helix with light weight, a non-traditional
> design of some sort might be tried. Perhaps paint the helix on the
> surface of an inflatable cylinder, with conductive paint?
Hi Gus, 8P6SM
In my opinion it is best to use for the helix a thick annealed
aluminum pipe because an inflatable cylinder for 2 m and 70 cm
with conductive paint has been experimented for high frequencies
but the tube is extremely large in diameter for 2m and 70 cm.
>
> Also, what if the coils/turns are something other than circular? perhaps
> rectangular or triangular?
If you use a coils/turns rectangular shape elements with a proper reflector
and feed system you make a "Qubical Quad "
>
> The brain has been tossing out crazy ideas recently, but in my
> experience, crazy ideas are not always crazy...
>
If the ideas are supported by a right theory they are not crazy ideas as it
was demonstrated by Dr. John Kraus W8JK the inventor of the axial-mode
helix antennas.
I suggest you to read the book "BIG EAR" by John Kraus edited by Cignus
Quasar Books Chapter 13 CORKSCREWS containing the Kraus idea on
how borned in his brain the idea to invent the axial-mode helix antenna.
In a separated email I have sent to you the article "The advantages of
circular polarization" by K4KJ that explain the above matter with many
drawings and pictures.
Have fun.
73" de i8CVS Domenico
>
> On 03/12/2014 04:49 PM, i8cvs wrote:
> > Hi Gus, 8P6SM
> >
> > Mounting 3 turn helix antenna for 2400 MHz concentrically
> > inside a 3 turns helix antenna for 1268 MHz was used as a
> > feed both wounded LHCP to illuminate a ground station prime
> > focus dish for RHCP uplink and downlink on Mode-L/S for
> > AO40 and it worked very well.
> >
> > If you plan to build a 10 turns RHCP helix antenna for 70 cm
> > conentrically into a 5 or 6 turns RHCP helix antenna for 2 meters
> > in my opinion it should work as well but the weight of this
> > antenna will be very very hight and not practical to be used in
> > comparison with yagi antennas.
> >
> > 73" de
> >
> > i8CVS Domenico
> >
> > ----- Original Message -----
> > From: "Gus" <gus@xxxxx.xxx>
> > To: <AMSAT-BB@xxxxx.xxx>
> > Sent: Wednesday, March 12, 2014 9:33 AM
> > Subject: [amsat-bb] Question for the antenna gurus
> >
> >
> >> Regarding axial-mode helix antennas, what happens if you build a helix
> >> for each of two different bands (like 2M/70cm), and mount them
> >> concentrically, on the same backplane?
> >> --
> >> Gus 8P6SM
> >> The Easternmost Isle
> >> _______________________________________________
> >> 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
> >
> >
>
> --
> Gus 8P6SM
> The Easternmost Isle
> _______________________________________________
> 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: 10
Date: Thu, 13 Mar 2014 01:57:05 -0400
From: Gus <gus@xxxxx.xxx>
To: i8cvs <domenico.i8cvs@xxx.xx>, AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: Question for the antenna gurus
Message-ID: <532148B1.6070909@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thank you again, Dom.
Just ordered "Big Ear". $3.96 2nd hand. It'll be several weeks before
it reaches me.
On 03/13/2014 01:42 AM, i8cvs wrote:
> ----- Original Message -----
> From: "Gus" <gus@xxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Thursday, March 13, 2014 2:20 AM
> Subject: [amsat-bb] Re: Question for the antenna gurus
>
>> Thanks for all info, Dom.
>>
>> to construct a large (2M) helix with light weight, a non-traditional
>> design of some sort might be tried. Perhaps paint the helix on the
>> surface of an inflatable cylinder, with conductive paint?
> Hi Gus, 8P6SM
>
> In my opinion it is best to use for the helix a thick annealed
> aluminum pipe because an inflatable cylinder for 2 m and 70 cm
> with conductive paint has been experimented for high frequencies
> but the tube is extremely large in diameter for 2m and 70 cm.
>
>> Also, what if the coils/turns are something other than circular? perhaps
>> rectangular or triangular?
> If you use a coils/turns rectangular shape elements with a proper reflector
> and feed system you make a "Qubical Quad "
>
>> The brain has been tossing out crazy ideas recently, but in my
>> experience, crazy ideas are not always crazy...
>>
> If the ideas are supported by a right theory they are not crazy ideas as it
> was demonstrated by Dr. John Kraus W8JK the inventor of the axial-mode
> helix antennas.
>
> I suggest you to read the book "BIG EAR" by John Kraus edited by Cignus
> Quasar Books Chapter 13 CORKSCREWS containing the Kraus idea on
> how borned in his brain the idea to invent the axial-mode helix antenna.
>
> In a separated email I have sent to you the article "The advantages of
> circular polarization" by K4KJ that explain the above matter with many
> drawings and pictures.
>
> Have fun.
>
> 73" de i8CVS Domenico
>
>> On 03/12/2014 04:49 PM, i8cvs wrote:
>>> Hi Gus, 8P6SM
>>>
>>> Mounting 3 turn helix antenna for 2400 MHz concentrically
>>> inside a 3 turns helix antenna for 1268 MHz was used as a
>>> feed both wounded LHCP to illuminate a ground station prime
>>> focus dish for RHCP uplink and downlink on Mode-L/S for
>>> AO40 and it worked very well.
>>>
>>> If you plan to build a 10 turns RHCP helix antenna for 70 cm
>>> conentrically into a 5 or 6 turns RHCP helix antenna for 2 meters
>>> in my opinion it should work as well but the weight of this
>>> antenna will be very very hight and not practical to be used in
>>> comparison with yagi antennas.
>>>
>>> 73" de
>>>
>>> i8CVS Domenico
>>>
>>> ----- Original Message -----
>>> From: "Gus" <gus@xxxxx.xxx>
>>> To: <AMSAT-BB@xxxxx.xxx>
>>> Sent: Wednesday, March 12, 2014 9:33 AM
>>> Subject: [amsat-bb] Question for the antenna gurus
>>>
>>>
>>>> Regarding axial-mode helix antennas, what happens if you build a helix
>>>> for each of two different bands (like 2M/70cm), and mount them
>>>> concentrically, on the same backplane?
>>>> --
>>>> Gus 8P6SM
>>>> The Easternmost Isle
>>>> _______________________________________________
>>>> 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
>>>
>>>
>> --
>> Gus 8P6SM
>> The Easternmost Isle
>> _______________________________________________
>> 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
>
--
Gus 8P6SM
The Easternmost Isle
------------------------------
Message: 11
Date: Thu, 13 Mar 2014 15:46:45 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] DSTAR net
Message-ID:
<1148341534.558464.1394725605296.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxx
xxxx.xxx>
Content-Type: text/plain; charset=utf-8
D Star satellite users net tonight 0100 utc (day light savings time now)
REF60B Would like to see some IC 9100 owners checkin and tell us how you
like the radio,also lets have everyone tell how many grids they now have,
states worked and countries confirmed
Thanks WA4HFN Damon em55
------------------------------
_______________________________________________
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 9, Issue 90
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