| |
CX2SA > SATDIG 06.06.10 20:09l 460 Lines 16616 Bytes #999 (0) @ WW
BID : AMSATBB5255
Read: GUEST
Subj: AMSAT-BB-digest V5 255
Path: IZ3LSV<IK2XDE<DB0RES<ON0AR<HS1LMV<CX2SA
Sent: 100606/1904Z @:CX2SA.LAV.URY.SA #:64520 [Minas] FBB7.00e $:AMSATBB5255
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. WD9EWK on the move tomorrow to DM56 (Patrick STODDARD)
2. AMSAT 2010 Space Symposium at Elk Grove Village, IL
(Mark Thompson)
3. Re: Re HELIX REFLECTOR? (Edward R Cole)
4. QSLs sent (Bob DeVarney W1ICW)
5. Re: FIELD DAY SCORING (Dee)
6. Re: Reminder (Dee)
7. WD9EWK @ DM56fd now (Patrick STODDARD)
----------------------------------------------------------------------
Message: 1
Date: Sat, 5 Jun 2010 21:59:16 -0700 (PDT)
From: Patrick STODDARD <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] WD9EWK on the move tomorrow to DM56
To: amsat-bb@xxxxx.xxx
Message-ID: <501443.67943.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Thanks to all the stations that worked me today, at the White Mountain
Hamfest in Show Low and later in the day at DM44xj/DM54aj north of Show
Low. WD9EWK logged 41 QSOs at the hamfest (including an amazing 12
QSOs on one AO7 pass around 1400 UTC!), followed by 47 more at
the grid boundary.
I hope to be up at DM56 Sunday morning for the 1620 UTC SO50 pass. I
may be able to park on the DM55/DM56 line, but the primary goal for
the day is DM56. I'll work passes on SO50, VO52, HO68, AO27, plus
an AO51 pass just before 2300 UTC.
Tomorrow will be a busy driving day - about 3 hours from here up to
DM56, then 5 hours or so from DM56 back home. With the long drive
home, I can't stay in DM56 for the passes after 2300 UTC nor do I
plan to stop for any passes that I could work in the evening.
I hope to work a bunch of you tomorrow from one of the rarely-heard grids
in Arizona. 73!
Patrick WD9EWK/VA7EWK - Pinetop-Lakeside, Arizona
http://www.wd9ewk.net/
------------------------------
Message: 2
Date: Sat, 5 Jun 2010 21:45:39 -0700 (PDT)
From: Mark Thompson <wb9qzb_groups@xxxxx.xxx>
Subject: [amsat-bb] AMSAT 2010 Space Symposium at Elk Grove Village,
IL
To: NS9RC@xxxxxxxxxxx.xxxx WeLCARS@xxxxxxxxxxx.xxxx
ILclubs@xxxxxxxxxxx.xxxxxxxxx@xxxxxxxxxxx.xxxx
PeoriaARC@xxxxxxxxxxx.xxxx svrc@xxxxxxxxxxx.xxxx
chicagoamateurradio@xxxxxxxxxxx.xxxx
CentralIndianaHams@xxxxxxxxxxx.xxxx IndyHamRadio@xxxxxxxxxxx.xxxx
MadisonAmateurRadio@xxxxxxxxxxx.xxxx
amateurradiomilwaukee@xxxxxxxxxxx.xxxx MHCMG@xxxxxxxxxxx.xxxx
amsat-bb@xxxxx.xxx
Cc: k9jkm@xxxxx.xxx
Message-ID: <793358.35830.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
http://forums.qrz.com/showthread.php?t=251141
AMSAT Announces 2010 Space Symposium
________________________________
AMSAT announces the 2010 Space Symposium and Annual Meeting will be held on
Friday, October 8 through Sunday, October 10. This year we have selected the
Chicago/Elk Grove Holiday Inn which is near O'Hare Airport for the event.
This is the same hotel that recently has hosted the Central States VHF
Conference, TAPR and W9DXCC events.
All Amateur Radio Operators interested in space communications are invited
to participate in the Symposium offerings including:
* Space Symposium with Amateur Satellite Presentations
* Operating Techniques, News, & Plans from the Amateur Satellite World
* Board of Directors Meeting open to AMSAT members
* Meet Board Members and Officers
* Annual General Membership Meeting
* Annual Banquet?Keynote Speaker and Door Prizes
* President's Club Reception
* Area Coordinator's BreakfastThe Chicago/Elk Grove Holiday Inn is located
at 1000 Busse Road, Elk Grove, IL (near O?Hare Airport with free hourly
shuttles). The room rate and reservation information will be announced
shortly.
Watch the AMSAT Symposium Page
www.amsat.org/amsat-new/symposium/2010/index.php
for more news as it becomes available.
2010 Space Symposium First Call for Papers, Posters & Presentations
This is the first call for papers for the 2010 AMSAT Space Symposium and
Annual Meeting to be held October 8 - 10 at the Chicago/Elk Grove Holiday
Inn near O'Hare Airport.
The Symposium Committee invites proposals for:
* Papers for publication in the Proceedings
* Symposium Presentations
* Poster Presentations
* Equipment and Operating DemonstrationsThese can be on any topic of
interest to the amateur satellite community. We request a tentative title of
your paper/presentation as soon as possible, with final copy submitted by
September 1, 2010 for inclusion in the printed proceedings.
Abstracts and papers should be sent via e-mail to k9jkm@xxxxx.xxx
The 2010 Symposium Author's Guide can be found at
www.amsat.org/amsat-new/images/fck_images/AuthorGuide2010%283%29.txt
------------------------------
Message: 3
Date: Sat, 05 Jun 2010 23:02:02 -0800
From: Edward R Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Re HELIX REFLECTOR?
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <201006060702.o56722QT050364@xxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
For space oriented antenna (satellite, eme, radio astronomy) that are
elevated to the sky, the height above ground should not matter since
ground-gain is not a factor once a minimum of elevation occurs. Many
antennas in these services are mounted close to ground to achieve
several objectives:
1) mechanical stability
2) lowered exposure to man-made RF interference
3) cost
4) maintenance access
5) lower physical exposure (wind area).
The response to radiation in other than the prime direction is very
important to reduce both interference and thermal ground noise. F/B
is just one of these parameters. Sidelobe level is another. It is
not primarily a pursuit of maximum gain that is important for maximum
receive sensitivity. The parameter that measures this is called G/T
ratio (gain/temperature ratio). So often some gain is sacrificed to
achieve lower (noise) temperature.
One should be sure that the E-M field of the driven element of the
antenna system is not affected by ground or other nearby objects that
can either de-tune of distort the pattern. But other than that
height is not a factor. Only when the antenna elevation is near the
horizon is this not true. Typically eme'rs see ground-gain effects
only below about 10-degrees elevation.
73, Ed
The Ohio State Big Ear Radiotelescope reflector was mounted with the
lower edge on the ground. The ground between the parabolic sector
antenna and the tiltable reflector was a conducting metallic
surface. But this is diverges from the original topic.
At 05:21 PM 6/5/2010, i8cvs wrote:
>Hi John,
>
>I agree with you.
>
>I have in my hands the book "RADIO ASTRONOMY" by John Kraus
>ISBN 07-035392-1
>
>This is the text of page-200
>
>"An example of a partially steerable (meridian transit) array antenna is
>presented in Fig.6-41
>This antenna,built in 1952 at the Ohio State University radio observatory,
>consists of an array of 96 helical-beam antennas, each of 11 turns, mounted
>on a tiltable steel grounded ground plane 160 ft long (east-west) by 22 ft
>wide. At a wavelenght of 1.2 meters the beam width measured 1 degree in
>right ascension by 8 degrees in declination."
>
>My comment:
>
>As seen from the photograph 6.41 the tiltable steel ground plane seems to be
>mounted at no more than 10 to 12 ft from the ground so that when the
>reflector is very large it seems that the high of it from the ground is not
>very important both for gain and front to back ratio.
>
>In this array the tiltable steel ground plane is 160 ft long and 22 ft wide
>with 24 helices in the longer side and 4 line of helices in the wide side
>(24 x 4 = 96 helices) so that the total ground plane area is 160 x 22 = 3520
>square foot and each helix reflector takes 3520 / 96 = 37 square foot or
>about a square surface of 6 x 6 foot or a round area of 3.4 square meters
>with a diameter of 2.08 meters.
>
>Since the operating wavelenght of the radiotelescope is 1.2 meters the
>reflector diameter for each helix antenna has been made large
>2.08 / 1.2 = 1.73 wavelenght and probably this is why a tiltable steel
>ground plane made so large can be mounted very close to the ground
>surface without affecting gain, front to back ratio and without to take
>too much noise at 290 kelvin from the ground.
>
>73" de
>
>i8CVS Domenico
>
>----- Original Message -----
>From: "John Belstner" <jbelstner@xxxxx.xxx>
>To: "Clare Fowler" <clarefowler@xxxxxx.xxx>
>Cc: "amsat-bb" <amsat-bb@xxxxx.xxx>
>Sent: Saturday, June 05, 2010 11:07 PM
>Subject: [amsat-bb] Re: Re HELIX REFLECTOR?
>
>
> > Just another $0.02 to add.
> >
> > You will find that the size and shape of the reflector will not affect the
> > forward gain as much as it does the F/B ratio. It depends on what is
> > important to you and (of course) how high you are above the ground. Even
> > for satellite operation pointing up, large back lobes reflecting off the
> > ground can adversely affect the forward pattern when the antenna is
> > mounted only 6-8 feet above ground.
> >
> > On Jun 4, 2010, at 10:13 PM, Clare Fowler wrote:
> >
> > >
> > > To add to the discussion the July/Aug 2007 Amsat Journal has an article
> > > covering some gain comparisonmeasurements I made between four
> > > 13 turn (2.88 wavelengths) 13cm antennas with different square solid
> > > aluminum reflectors.
> > > The sizes were 0.56 wavelengths, 0.84 wavelengths, 1.0 wavelength and
> >> 1.4 wavelengths.
> > > There was no difference between the 0.84, 1.0 and 1.4 wavelengths but
> > > the antenna with the0.56 wavelength reflector had 1.5 db less gain.
> > >
> > > However for my 70cm helix antennas I followed the Satellite Handbook
> > > minimum size of 0.6 wavelengthsor slightly over 16 inches. I used 1/2
> > > inch hardware cloth mesh to keep the weight and windloading down.
> > > These antennas have performed well however it appears that they would be
> > > a bit better with a somewhat larger reflector.
> > >
> > > A brief description and picture of the 70 cm reflector is in the
> > > November/December 2005 Amsat Journal article on
> > > The Development of a Quarter Wave Match for helical antennas.
> > >
> > > Clare VE3NPC
> > >
> >>> Hi All:
> >>> I am rebuilding a 440 MHZ Helix that I built several years ago . It
> >>> worked very well, but I would like to reduce the size of the reflector
> >>> to a more manageable size than I had before. The only reference to
> >>> reflector size I can find is, "minimum 20" ". I may be looking in the
> >>>wrong places.
> >>> I would appreciate it, if someone would steer me in the right direction.
> >>> Thanks,
> >>> Pete, K1HZU
>
>
>
>
>_______________________________________________
>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
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
------------------------------
Message: 4
Date: Sun, 06 Jun 2010 09:45:42 -0400
From: Bob DeVarney W1ICW <w1icw@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] QSLs sent
To: amsat-bb@xxxxx.xxx
Message-ID: <4C0BA686.8060901@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
To all who have sent me QSLs over the last several years. I am finally
getting back in to the hobby and sat down last night and filled out a
bunch of cards. S if anyone was waiting for VT on the sats from either
W1ICW or WE1U, your patience is about to be rewarded.
I am ashamed to admit some of the cards had 34 cent stamps on the
SASEs... that's how far behind I had gotten.
Again, my apologies and 73,
Bob W1ICW
------------------------------
Message: 5
Date: Sun, 06 Jun 2010 09:53:54 -0400
From: Dee <morsesat@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: FIELD DAY SCORING
To: "'Bruce'" <kk5do@xxxx.xxx>, "'Peter Portanova'"
<roic@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <3D14059B5DB142E2886E24314BCA1AEA@xxxxxxxx>
Content-Type: text/plain; charset=us-ascii
Yes guys,
This makes it important as an AMSAT satellite operator doesn't have to put
his gear away after one(1) contact. He can still Demo the sats for the
observers. Good luck being heard through the 50 watters...
Good job Pete.
73,
Dee, NB2F
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bruce
Sent: Saturday, June 05, 2010 11:13 AM
To: Peter Portanova
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: FIELD DAY SCORING
That should make it much easier for everyone as you don't have to do one log
and then strip out the unwanted calls for the other. Thanks Pete. I am glad
that the two minds (ARRL and AMSAT) have become one.
73...bruce
________________________________
From: Peter Portanova <roic@xxxxxxxxx.xxx>
To: amsaT-BB@xxxxx.xxx
Sent: Sat, June 5, 2010 9:33:07 AM
Subject: [amsat-bb] FIELD DAY SCORING
Hello,
I was in contact with the ARRL, after I read 7.3.7. and 7.3.7.1. in the
Field Day Rules. I mentioned to the League that I would like them to point
out where in those rules it would prohibit scoring the same call on multiple
Linear Satellites. They listened to my point's and agreed that even though
the rules refer to satellite contacts as a separate "band" there is nothing
in those rules that prohibit the aforementioned scoring. In conclusion
Field Day and the AMSAT scoring are now in agreement, have fun.
73's Pete
WB2OQQ
www.massapequanyweather.com
_______________________________________________
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: 6
Date: Sun, 06 Jun 2010 10:22:13 -0400
From: Dee <morsesat@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Reminder
To: "'Martha'" <martha@xxxxx.xxx>, "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <04D715A2AE4943CC8CF6D023F7543E42@xxxxxxxx>
Content-Type: text/plain; charset=us-ascii
All Members,
This is one of the most important happenings in the AMSAT organization. Not
to have a deluge of nominations, however, this is the opportunity for those
that have condemned, commented, misrepresented facts, assumed, found
unresponsive, answered their own questions, incomplete readings of postings,
jumping the gun etc. to give some input to AMSAT's future. To those that
will vote for nominees, look carefully at the qualifications and remember
our past history of taking the higher roads for our organization. Hat's off
to our volunteers and the time, effort and input towards our goals. (see ANS
150 & ANS 157)
Dee, NB2F
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Martha
Sent: Thursday, June 03, 2010 4:18 PM
To: AMSAT BB
Subject: [amsat-bb] Reminder
Nominations for the AMSAT Board of Directors must arrive at the AMSAT Office
no later than June 15th. A nomination requires either one current Member
Society or five current individual members. Three directors' terms expire
this year.
--
73- Martha
_______________________________________________
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: 7
Date: Sun, 6 Jun 2010 09:04:57 -0700 (PDT)
From: Patrick STODDARD <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] WD9EWK @ DM56fd now
To: amsat-bb@xxxxx.xxx
Message-ID: <877996.35220.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
There was no safe place to park along US-191 at the DM55/DM56 line,
so I drove north to the town of Chinle, at DM56fd, to work
various passes. I will be ready for SO50 in about 15 minutes.
73!
Patrick WD9EWK/VA7EWK - Chinle, Arizona
http://www.wd9ewk.net/
------------------------------
_______________________________________________
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 5, Issue 255
****************************************
Read previous mail | Read next mail
| |
