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CX2SA > SATDIG 25.05.16 04:09l 884 Lines 33181 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Which rotor to buy? (daleh)
2. Cuscraft 416-TB and 22XB phasing harneses??? (Tom Schuessler)
3. Upcoming ARISS Contact Schedule as of 2016-05-24 03:30 UTC
(AJ9N@xxx.xxxx
4. Re: Cuscraft 416-TB and 22XB phasing harneses??? (Richard Tejera)
5. Re: Cuscraft 416-TB and 22XB phasing harneses??? (Chris Thompson)
6. Re: Cuscraft 416-TB and 22XB phasing harneses???
(jerry.tuyls@xxxxxxx.xxx
7. Re: Cuscraft 416-TB and 22XB phasing harneses??? (Bob)
8. Re: Cuscraft 416-TB and 22XB phasing harneses??? (Jim Walls)
9. Re: Cuscraft 416-TB and 22XB phasing harneses??? (Chris Thompson)
10. HAMSCI web site opens up (Robert McGwier)
11. My Rookie Expedition to GN05/06 (Ken Alexander)
----------------------------------------------------------------------
Message: 1
Date: Mon, 23 May 2016 18:27:39 -0800
From: daleh <daleh@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Which rotor to buy?
Message-ID: <d59451a9-ed60-899d-992a-d867017c63a5@xxxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
I concur. I use G5500 with LVB tracker SatPC32 with IC910H. It is
really a plug-and-play setup.
Dale,KL7Xj
On 5/23/2016 3:57 PM, Mvivona via AMSAT-BB wrote:
> Henk,
> If you want to keep it straightforward simple and have it do everything
you need, I would suggest the Yaesu G5500 with an LVB tracker. Has plenty of
horsepower and fully controlled automatically through SatPC32. It's a
plug-and-play set up.
>
> Michael KC4ZVA
> Sent from my iPad
>
> On May 23, 2016, at 11:53 AM, PA3GUO <pa3guo@xxxxxxx.xx> wrote:
>
>
> This is my current antenna setup:
> http://www.pa3guo.com/a7.jpg
> Basically, 6 ele for 145, 17 ele for 440, 23 ele for 1200, small quad for
23, and a multiband vertical.
> I am planning revise and clean this.
> AZI rotor kr400, 30 years old, 20 years by me, and 20 years in use.
> ELE rotor kr500, also 20 years in service.
> I know how to clean these rotors, but consider to replace the AZI rotor
with a new one.
> Any advice?
> G450, seems less strong as the kr400.
> G650?
> G1000sdx or dxc?
> G5500?
> I do control these for sat tracking.
> Is variable speed in that case a disadvantage?
> Other thoughts?
> Here is a comparison table:
>
http://kur02.com.au/index.php?option=com_content&view=article&id=23&Itemid=32
> I tend towards a G650 which costs around 425 dollar here, the G1000 dxc is
600 dollar.
> --
> Henk, PA3GUO
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
>
------------------------------
Message: 2
Date: Mon, 23 May 2016 22:32:40 -0500
From: "Tom Schuessler" <tjschuessler@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID: <009101d1b56c$ed6db360$c8491a20$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hello all,
I recently acquired a pair of Cushcraft Satellite antennas, the 22XB and the
416-TB. Both are Cross fed dual polarity Yagis. What did not come with
either of these antennas was the phasing harnesses that were a part of the
original contents. The two meter 22XB is fed with crossed driven elements
in the same location on the boom and SO239 connectors in place on the
antenna. The 416-TB has direct connections from coax to the driven elements
and also to the coax balun on each of the driven elements. The driven
elements are offset fed so as to provide the natural delay in the one
direction.
Cushcraft did sell a PS-4 which I believe was a relay controlled switch for
the 435Mhz 416-TB but if they sold a 2 meter version, I cannot tell. I do
have a contact at Cushcraft I was given that I will be reaching out to for
more information
The "Satellite handbook" does have some description on how to configure a
fixed harness for the two types of feed orientations. I am though confused
to understand how to understand the direction of rotation but that is for
another post.
Anyway, does anyone who used to have these antennas or something similar
have phasing harnesses, either fixed or switchable that would work with them
lying around? I would be interested in acquiring them from you.
Thanks and 73.
Tom Schuessler, N5HYP
N5HYP@xxxx.xxx
PS. I just picked up a used FT-847 so am looking forward to getting these
antennas up in the air and seeing how they perform.
------------------------------
Message: 3
Date: Mon, 23 May 2016 23:37:42 -0400
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2016-05-24
03:30 UTC
Message-ID: <490b5c.486a8daa.44752685@xxx.xxx>
Content-Type: text/plain; charset="ISO-8859-1"
Upcoming ARISS Contact Schedule as of 2016-05-24 03:30 UTC
Quick list of scheduled contacts and events:
Cradle of Aviation Museum and Education Center, Garden City, New York,
telebridge via W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Jeff Williams KD5TVQ
Contact was successful: Mon 2016-05-23 12:57:05 UTC 43 deg (***)
Venta School, Carp, ON, Canada, telebridge via IK1SLD
The ISS callsign is presently scheduled to be OR4ISS
The scheduled astronaut is Jeff Williams KD5TVQ (***)
Contact is a go for: Mon 2016-05-30 19:01:25 UTC 32 deg(***)
Bouze Island Elementary and Junior High School, Homeji, Japan, direct via
8N3B
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Timothy Peake KG5BVI
Contact is a go for: Sat 2016-06-04 08:31:09 UTC 74 deg (***)
****************************************************************************
**
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
****************************************************************************
***
All ARISS contacts are made via the Ericsson radio unless otherwise noted.
****************************************************************************
***
Several of you have sent me emails asking about the RAC ARISS website and
not being able to get in. That has now been changed to
http://www.ariss.org/
Note that there are links to other ARISS websites from this site.
****************************************************************************
Looking for something new to do? How about receiving DATV from the ISS?
If interested, then please go to the ARISS-EU website for complete
details. Look for the buttons indicating Ham Video.
http://www.ariss-eu.org/
If you need some assistance, ARISS mentor Kerry N6IZW, might be able to
provide some insight. Contact Kerry at kbanke@xxxxxxxxx.xxx
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:
Gaston ON4WF with 121
Satoshi 7M3TJZ with 118
Francesco IK?WGF with 116
****************************************************************************
The webpages listed below were all reviewed for accuracy. Out of date
webpages were removed and new ones have been added. If there are
additional
ARISS websites I need to know about, please let me know.
Note, all times are approximate. It is recommended that you do your own
orbital prediction or start listening about 10 minutes before the listed
time.
All dates and times listed follow International Standard ISO 8061 date
and
time format YYYY-MM-DD HH:MM:SS
The complete schedule page has been updated as of 2016-05-24 03:30 UTC.
(***)
Here you will find a listing of all scheduled school contacts, and
questions, other ISS related websites, IRLP and Echolink websites, and
instructions for any contact that may be streamed live.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Total number of ARISS ISS to earth school events is 1059. (***)
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1024. (***)
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 47.
A complete year by year breakdown of the contacts may be found in the
file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Please feel free to contact me if more detailed statistics are needed.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following US states and entities have never had an ARISS contact:
Arkansas, Delaware,South Dakota,Wyoming, American Samoa, Guam, Northern
Marianas Islands, and the Virgin Islands.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
QSL information may be found at:
http://www.ariss.org/qsl-cards.html
ISS callsigns: DP?ISS, IR?ISS, NA1SS, OR4ISS, RS?ISS
****************************************************************************
The successful school list has been updated as of 2016-05-24 03:30 UTC.
(***)
http://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf
Frequency chart for packet, voice, and crossband repeater modes showing
Doppler correction as of 2005-07-29 04:00 UTC
http://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correction
.rtf
Listing of ARISS related magazine articles as of 2006-07-10 03:30 UTC.
http://www.amsat.org/amsat/ariss/news/ARISS_magazine_articles.rtf
Check out the Zoho reports of the ARISS contacts
https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415
****************************************************************************
Exp. 46 on orbit
Tim Kopra KE5UDN
Timothy Peake KG5BVI
Yuri Malenchenko RK3DUP
Exp. 47 on orbit
Jeff Williams KD5TVQ
Oleg Skripochka RN3FU
Aleksey Ovchinin
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 4
Date: Mon, 23 May 2016 22:30:32 -0700
From: Richard Tejera <Saguaroastro@xxx.xxx>
To: Tom Schuessler <tjschuessler@xxxxxxx.xxx>, 'AMSAT'
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID: <0d202vqg0m90tlb6gr1wkm98.1464067832627@xxxxx.xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Tom,
I have a copy of the manual for this antenna. I'd be happy to scan it and
send it to you. It may be of some help.
Rick Tejera K7TEJ
Saguaro Astronomy Club
www.SaguaroAstro.org
Thunderbird Amateur Radio Club
www.w7tbc.org
On May 23, 2016, at 20:32, Tom Schuessler <tjschuessler@xxxxxxx.xxx> wrote:
Hello all,
I recently acquired a pair of Cushcraft Satellite antennas, the 22XB and the
416-TB. Both are Cross fed dual polarity Yagis. What did not come with
either of these antennas was the phasing harnesses that were a part of the
original contents. The two meter 22XB is fed with crossed driven elements
in the same location on the boom and SO239 connectors in place on the
antenna. The 416-TB has direct connections from coax to the driven elements
and also to the coax balun on each of the driven elements. The driven
elements are offset fed so as to provide the natural delay in the one
direction.
Cushcraft did sell a PS-4 which I believe was a relay controlled switch for
the 435Mhz 416-TB but if they sold a 2 meter version, I cannot tell. I do
have a contact at Cushcraft I was given that I will be reaching out to for
more information
The "Satellite handbook" does have some description on how to configure a
fixed harness for the two types of feed orientations. I am though confused
to understand how to understand the direction of rotation but that is for
another post.
Anyway, does anyone who used to have these antennas or something similar
have phasing harnesses, either fixed or switchable that would work with them
lying around? I would be interested in acquiring them from you.
Thanks and 73.
Tom Schuessler, N5HYP
N5HYP@xxxx.xxx
PS. I just picked up a used FT-847 so am looking forward to getting these
antennas up in the air and seeing how they perform.
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Tue, 24 May 2016 10:32:13 -0400
From: Chris Thompson <g0kla@xxxx.xxx>
To: Richard Tejera <Saguaroastro@xxx.xxx>
Cc: AMSAT <amsat-bb@xxxxx.xxx>, Tom Schuessler
<tjschuessler@xxxxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID:
<CAJOf0+sPc4Am_QQg2AJ+Y9nff0PnVok3SvT9vCdVvg03DfZ3Kg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Tom,
I'm also setting up some antennae and have the elements mounted in the same
position. My understanding it that to get Circular Polarization you need
to feed one antennae quarter of a wavelength ahead of the other. The
examples in the satellite handbook show the antennae physically mounted
quarter of a wavelength apart. If the elements are in the same location
then the feed line to one needs to be 1/4 wavelength shorter than to the
other. Then it will be fed first and the signal will be 1/4 wavelength
ahead of the other antenna. Note that the elements will actually be
slightly offset and this difference should be taken into account in the
feed line length.
The two feed lines should each be 50 ohm. You can then combine them with a
standard combiner or use a coax T and two quarter wavelength sections of 75
ohm coax, one for each feed line, as a matching section.
I don't think it is worthwhile setting up the ability to switch from LHCP
to RHCP or vice versa if the spacecraft has linear antennae, because the
difference is only 3dB, but others may disagree. If the spacecraft has CP
antennae then its very important to match the polarization.
Good explanation here: http://www.pe0sat.vgnet.nl/antenna/polarization/
Chris
On Tue, May 24, 2016 at 1:30 AM, Richard Tejera <Saguaroastro@xxx.xxx>
wrote:
> Tom,
>
> I have a copy of the manual for this antenna. I'd be happy to scan it and
> send it to you. It may be of some help.
>
> Rick Tejera K7TEJ
> Saguaro Astronomy Club
> www.SaguaroAstro.org
> Thunderbird Amateur Radio Club
> www.w7tbc.org
>
> On May 23, 2016, at 20:32, Tom Schuessler <tjschuessler@xxxxxxx.xxx>
> wrote:
>
> Hello all,
>
> I recently acquired a pair of Cushcraft Satellite antennas, the 22XB and
> the
> 416-TB. Both are Cross fed dual polarity Yagis. What did not come with
> either of these antennas was the phasing harnesses that were a part of the
> original contents. The two meter 22XB is fed with crossed driven elements
> in the same location on the boom and SO239 connectors in place on the
> antenna. The 416-TB has direct connections from coax to the driven
> elements
> and also to the coax balun on each of the driven elements. The driven
> elements are offset fed so as to provide the natural delay in the one
> direction.
>
> Cushcraft did sell a PS-4 which I believe was a relay controlled switch for
> the 435Mhz 416-TB but if they sold a 2 meter version, I cannot tell. I do
> have a contact at Cushcraft I was given that I will be reaching out to for
> more information
>
> The "Satellite handbook" does have some description on how to configure a
> fixed harness for the two types of feed orientations. I am though confused
> to understand how to understand the direction of rotation but that is for
> another post.
>
> Anyway, does anyone who used to have these antennas or something similar
> have phasing harnesses, either fixed or switchable that would work with
> them
> lying around? I would be interested in acquiring them from you.
>
> Thanks and 73.
>
> Tom Schuessler, N5HYP
> N5HYP@xxxx.xxx
>
> PS. I just picked up a used FT-847 so am looking forward to getting these
> antennas up in the air and seeing how they perform.
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Chris E. Thompson
chrisethompson@xxxxx.xxx
g0kla@xxxx.xxx
------------------------------
Message: 6
Date: Tue, 24 May 2016 16:57:11 +0200 (CEST)
From: jerry.tuyls@xxxxxxx.xx
To: Chris Thompson <g0kla@xxxx.xxx>
Cc: AMSAT <amsat-bb@xxxxx.xxx>, Tom Schuessler
<tjschuessler@xxxxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID: <936075667.595382.1464101831853.JavaMail.root@xxxxxxx.xx>
Content-Type: text/plain; charset=utf-8
Hello
I have the Maspro system in use here and i switch polarisation from RHCP to
LHCP almost every pass, no matter which sat i'm working on, to get best sigs
up and down.
My homemade antennes are only RHCP, but i compared them with the Maspo
system and changing pol gave big differences at my location.
The homemade cross yagis are made with elements spaced exactly 1/4 lambda,
because it is easier then to make the feedlines. When spacings are less then
1/4 lambda, you need to use the difference in that spacing in the
calculation for the exact lenght of the feedlines.(90?= 1/4 lamda spacing).I
use 2 pieces of 75ohm to a T-connector, or you can use 50ohm to a 2port
combiner.
Made crossyagis for 2m,70cm and 23cm...all working great, but like my Maspro
WHS-32N system more because i have pol-switching on them.
73's
Jerry,ON4CJQ
----- Oorspronkelijk bericht -----
Van: "Chris Thompson" <g0kla@xxxx.xxx>
Aan: "Richard Tejera" <Saguaroastro@xxx.xxx>
Cc: "AMSAT" <amsat-bb@xxxxx.xxx>, "Tom Schuessler" <tjschuessler@xxxxxxx.xxx>
Verzonden: Dinsdag 24 mei 2016 16:32:13
Onderwerp: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Tom,
I'm also setting up some antennae and have the elements mounted in the same
position. My understanding it that to get Circular Polarization you need
to feed one antennae quarter of a wavelength ahead of the other. The
examples in the satellite handbook show the antennae physically mounted
quarter of a wavelength apart. If the elements are in the same location
then the feed line to one needs to be 1/4 wavelength shorter than to the
other. Then it will be fed first and the signal will be 1/4 wavelength
ahead of the other antenna. Note that the elements will actually be
slightly offset and this difference should be taken into account in the
feed line length.
The two feed lines should each be 50 ohm. You can then combine them with a
standard combiner or use a coax T and two quarter wavelength sections of 75
ohm coax, one for each feed line, as a matching section.
I don't think it is worthwhile setting up the ability to switch from LHCP
to RHCP or vice versa if the spacecraft has linear antennae, because the
difference is only 3dB, but others may disagree. If the spacecraft has CP
antennae then its very important to match the polarization.
Good explanation here: http://www.pe0sat.vgnet.nl/antenna/polarization/
Chris
On Tue, May 24, 2016 at 1:30 AM, Richard Tejera <Saguaroastro@xxx.xxx>
wrote:
> Tom,
>
> I have a copy of the manual for this antenna. I'd be happy to scan it and
> send it to you. It may be of some help.
>
> Rick Tejera K7TEJ
> Saguaro Astronomy Club
> www.SaguaroAstro.org
> Thunderbird Amateur Radio Club
> www.w7tbc.org
>
> On May 23, 2016, at 20:32, Tom Schuessler <tjschuessler@xxxxxxx.xxx>
> wrote:
>
> Hello all,
>
> I recently acquired a pair of Cushcraft Satellite antennas, the 22XB and
> the
> 416-TB. Both are Cross fed dual polarity Yagis. What did not come with
> either of these antennas was the phasing harnesses that were a part of the
> original contents. The two meter 22XB is fed with crossed driven elements
> in the same location on the boom and SO239 connectors in place on the
> antenna. The 416-TB has direct connections from coax to the driven
> elements
> and also to the coax balun on each of the driven elements. The driven
> elements are offset fed so as to provide the natural delay in the one
> direction.
>
> Cushcraft did sell a PS-4 which I believe was a relay controlled switch for
> the 435Mhz 416-TB but if they sold a 2 meter version, I cannot tell. I do
> have a contact at Cushcraft I was given that I will be reaching out to for
> more information
>
> The "Satellite handbook" does have some description on how to configure a
> fixed harness for the two types of feed orientations. I am though confused
> to understand how to understand the direction of rotation but that is for
> another post.
>
> Anyway, does anyone who used to have these antennas or something similar
> have phasing harnesses, either fixed or switchable that would work with
> them
> lying around? I would be interested in acquiring them from you.
>
> Thanks and 73.
>
> Tom Schuessler, N5HYP
> N5HYP@xxxx.xxx
>
> PS. I just picked up a used FT-847 so am looking forward to getting these
> antennas up in the air and seeing how they perform.
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Chris E. Thompson
chrisethompson@xxxxx.xxx
g0kla@xxxx.xxx
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Tue, 24 May 2016 11:00:29 -0400
From: Bob <WB4SON@xxxxx.xxx>
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID:
<CAPonRZ_6=TNXCHm+KP-z11iLo2bXP99vYMic_m_zkyMeW5aAzQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Just another person's opinion on the following:
"I don't think it is worthwhile setting up the ability to switch from LHCP
to RHCP or vice versa if the spacecraft has linear antennae"
My personal experience says that if your goal is to maximize your
horizon-to-horizon communication, then you need the LHCP/RHCP switch. When
doing an ARISS contact with the ISS, which uses a linear antenna, switching
polarity was the difference between a weak or non-existent signal and one
that was full quieting. The ionosphere does strange things to a signal
(Faraday Rotation), that results in it taking on the characteristics of a
RHCP or LHCP signal at times. If your antenna happens to be the opposite
at that moment, then you will experience a very deep fade due to the
mismatch in polarity.
Certainly working the ISS for a room full of kids is a different thing --
you want them to have the best possible experience and recognize that lay
people are not good at digging signals out of the noise. Your requirements
for the best possible signal levels at all times is higher than during
casual communication.
If you are a horizon-to-horizon person trying to maximize your contact
success then the polarity switch will make sense. Otherwise skip it as
Chris suggested.
73, Bob, WB4SON
------------------------------
Message: 8
Date: Tue, 24 May 2016 08:43:46 -0700
From: "Jim Walls" <jim@xxxxx.xxx>
To: "AMSAT" <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID: <eed4cb8ae10843d98de254b9fa058815@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Chris Thompson said (in part):
> I don't think it is worthwhile setting up the ability to switch from
LHCP
> to RHCP or vice versa if the spacecraft has linear antennae, because the
> difference is only 3dB, but others may disagree.
Chris, Add one more to disagree with you. I have crossed yagis on 2M and
430 that are used for both terrestrial and satellite. I can switch between
polarities and sometimes it makes little difference, but on some passes,
the difference is quite pronounced. When trying to dig out a really weak
signal, even a few dB is quite helpful.
Jim - K6CCC
Satellite inactive at the moment...
------------------------------
Message: 9
Date: Tue, 24 May 2016 15:43:41 -0400
From: Chris Thompson <g0kla@xxxx.xxx>
To: jim@xxxxx.xxx
Cc: AMSAT <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cuscraft 416-TB and 22XB phasing harneses???
Message-ID:
<CAJOf0+v4Tk83S2xmkEt3uZHKPusYV-L8XNUq-sdGoGaYmokNzA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Chris Thompson said (in part):
> I don't think it is worthwhile setting up the ability to switch from LHCP
> to RHCP or vice versa if the spacecraft has linear antennae, because the
> difference is only 3dB, but others may disagree.
Don't take what I typed too literally. There will clearly be a difference
and I agree that the atmosphere does all sorts of funny stuff.
Experimentation is the fun part of what we do :)
Chris
On Tue, May 24, 2016 at 11:43 AM, Jim Walls <jim@xxxxx.xxx> wrote:
>
>
> Chris, Add one more to disagree with you. I have crossed yagis on 2M and
> 430 that are used for both terrestrial and satellite. I can switch between
> polarities and sometimes it makes little difference, but on some passes,
> the difference is quite pronounced. When trying to dig out a really weak
> signal, even a few dB is quite helpful.
>
> Jim - K6CCC
> Satellite inactive at the moment...
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Chris E. Thompson
chrisethompson@xxxxx.xxx
g0kla@xxxx.xxx
------------------------------
Message: 10
Date: Tue, 24 May 2016 17:55:10 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] HAMSCI web site opens up
Message-ID:
<CA+K5gzdCwOJFfPe011cNxHoj8eiN1k_6Rd0qaH9S8GfenTxP8w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Let's study propagation during the upcoming solar eclipse in the US!
http://hamsci.org/article/hamsci-eclipse-team-meets-dayton
73s
N4HY
--
Bob McGwier
Founder, Federated Wireless, Inc
Founder and Technical Advisor, HawkEye 360, Inc
Research Professor Virginia Tech
Chief Scientist: The Ted and Karyn Hume Center for National Security and
Technology
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
Director of AMSAT
------------------------------
Message: 11
Date: Tue, 24 May 2016 21:52:19 -0400
From: Ken Alexander <k.alexander@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] My Rookie Expedition to GN05/06
Message-ID: <46182aa2-db09-5be8-e11f-d192e71847fc@xxxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
What a thrill it was to make my first ever contacts via satellite this
past weekend! This is something I've wanted to do since first hearing
the 10m downlink from OSCARs 6 and 7 on my HW-101 when I got my license
in 1974. It only took me 42 years to finally do it (that's about
average for me!).
I'm a mediumwave DXer and once or twice a year a few of my friends and I
head to the east coast to listen for trans-Atlantic DX on the AM
broadcast band. Conditions are spectacular from the coast; this past
weekend we heard multiple AM stations from Brazil, Argentina, Paraguay
and throughout Europe. We use an SDR receiver, which allows us to
record every station on the entire mediumwave band simultaneously to a
hard disk on a notebook computer. We do that several times an evening.
Afterwards, we can play back the recordings and "tune" through the band,
use filters and other aids just as if we were listening live. It
literally takes weeks to go through all the recordings.
Anyway, I am also a sometimes VHF contester and when I had a look at the
grid we would be in, and the ones nearby, I knew it was time to get
geared up and try and make a small contribution. I received many
generous offers of assistance when I posted my message to this reflector
last week. I'm grateful for all of them; most notably from Drew
Glasbrenner, KO4MA and Patrick Stoddard , WD9EWK. Patrick walked me
through the critical setup of my TH-D72A, which was only 3 days old when
we left for Nova Scotia. Patrick was only an e-mail away for the rest
of the weekend, offering valuable advice. Without him there would have
been no expedition.
I think I already mentioned how much time I spent calling on the
downlink frequency. That was finally overcome sometime on Sunday
morning. My technique improved to the point where I could use the tip
of the 70cm reflector to hit the VFO A/B button on the radio instead of
putting the antenna down to use my fingers. I went from zero QSOs on
Saturday, to two on Sunday to nine QSOs on Monday! Logs follow:
2016-05-22 1324 UTC W1PA FN42 SO-50 from GN05 Satellite QSO #1!!
2016-05-22 1505 UTC KI4RO EM88 SO-50 from GN06
2016-05-23 0521 UTC N8HM FM18 SO-50 from GN05
2016-05-23 0522 UTC N4UFO EM95 SO-50 from GN05
2016-05-23 1210 UTC VY2HF FN86 SO-50 from GN06
2016-05-23 1349 UTC N1AIA FN43 SO-50 from GN05
2016-05-23 1349 UTC WN9Q EN64 SO-50 from GN05
2016-05-23 1349 UTC KD8ATF FM09 SO-50 from GN05
2016-05-23 1349 UTC KC1EXK FN41 SO-50 from GN05
2016-05-23 1349 UTC W1PA FN42 SO-50 from GN05
2016-05-23 1349 UTC VY2HF FN86 SO-50 from GN05
2016-05-23 1349 UTC NS3L Only partial information received
My home grid is FN03. I think that must be pretty common by now, but
there are many that I suspect aren't so common that are only a few hours
away. After my first taste of satellite work I can tell you that you
will hopefully be hearing a lot more from VE3HLS!
Thanks to all of you for your encouragement and patience!
73,
Ken Alexander
VE3HLS
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
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!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 11, Issue 161
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