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CX2SA > SATDIG 08.05.18 15:09l 932 Lines 30107 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Notes on RFI from Solar Panels. (Robert Bruninga)
2. Re: Asking about FM sats frequency (Brad Brooks)
3. NASA Helical Antenna Question (Steve Bossert)
4. Re: NASA Helical Antenna Question (John Brier)
5. Re: NASA Helical Antenna Question (Glenn Little WB4UIV)
6. Re: NASA Helical Antenna Question (John Mac)
7. Re: NASA Helical Antenna Question (Robert Bruninga)
8. Re: NASA Helical Antenna Question (Wendy and Terry Osborne)
9. Upcoming ARISS Contact Schedule as of 2018-05-08 06:30 UTC
(aj9n@???.????
10. FUNcube-1 mode change (Graham Shirville)
11. Re: NASA Helical Antenna Question (Nico Janssen)
----------------------------------------------------------------------
Message: 1
Date: Mon, 7 May 2018 13:22:25 -0400
From: Robert Bruninga <bruninga@????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Notes on RFI from Solar Panels.
Message-ID: <bbee1af3969f9dfb06015d978754df3e@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
John Pink G8MM commented as follows on my concerns for RFI from Solar that
can negatively affect amateur radio operations:
*From:* john_pink
*Sent:* Monday, May 07, 2018 12:02 PM
*Subject:* RE: NEC 2017 codes of practice.
Bob, I read with interest your comments on the implications of NEC 2017.
You said 'I hope I am not being alarmist' - I don't think you are - however
you are tackling the issue on the wrong front.
The issue that you need to raise concerns the 'standards' that govern the
interfaces between panels and optimisers - and any other ancillary
equipment. There are IEC and IEEE standards that state the permissible
levels of emission from the ports of these equipment, and the frequencies
they use The standards are for the most part derived from standard agreed
by CISPR.
As a contributor to CISPR through my work at British Standards Institute,
and CENELEC in Brussels, I am aware of many licenced radio amateur from the
USA who are involved in this work. In fact the lead representative for the
USA on the subject of harvesting of solar energy is an active licensee. He
is also involved with all aspect of Near Field charging of vehicle -
another topic which should cause radio amateurs great concern.
I would recommend two things. Firstly that you encourage ARRL to increase
its support for this important and valuable work, this may means financial
support for the representatives, since the meetings are held around the
world. ARRL need to sponsor 'experts' to ensure that the cost of travel is
reimbursed. ( RSGB has been very generous in this respect). Secondly, find
a way, if this does not already exist, to become involved in NEC affairs -
it should be possible to have ARRL representation involved in their work.
The objective is to ensure that 'best practice' is used on all and every
installation of Solar harvesting schemes.
To summarise, the steps should ensure that the items of equipment
(apparatus) are compliant with international standards that are designed to
protect radio services, and then ensure that the equipment are installed in
such a way that they do not negate compliance with the standard. For
example, if the equipment is connected with twisted pairs in order the meet
the compliance test - the installer must follow the same practice - and so
NEC 2017 (or later versions), must make that clear.
Since every authorised installer should carry and be checked against the
NEC installation practice, things will get better. However, I acknowledge
that best practice is followed when safety issues are concerned - but
rarely are rarely understood when EMC matters are important, and that it
what you have to get across with NEC - and we have to get across here in
Europe, where we face exactly the same challenge.
All of this is an international effort, because for the most part Solar
harvesting equipment is manufacturer around the world. Here in Europe the
systems come from China or Germany. Which means that it may be compliant
with CENELEC requirements to carry the ubiquitous CE mark. Note that little
word 'may', by which I suggest that there are ways around the compliance
system - just as there are ways around FCC marking.
CISPR - Special International Committee for Radio Interference, affiliated
with International Electro-Technical Commission (IEC)
CENELEC European Committee for Electrical Standards
I hope this helps - do let me know if I can provide any additional
background.
John - G8MM, F5VKU
------------------------------
Message: 2
Date: Mon, 7 May 2018 10:17:55 -0500
From: Brad Brooks <brad.wf7t@?????.???>
To: amsat-bb@?????.???? Roy Dean <royldean@?????.???>, Robert Switzer
<robert_switzer@???.???>, Robert Switzer <rs2atmink@?????.???>
Subject: Re: [amsat-bb] Asking about FM sats frequency
Message-ID: <99cb8164-e172-44bd-acf7-00ddf24ec517@?????>
Content-Type: text/plain; charset="utf-8"
Check this link: https://www.amsat.org/station-and-operating-hints/.
Plenty of documentation re: freq tables.
73 Brad WF7T
On May 7, 2018, 8:24 AM -0500, Robert Switzer via AMSAT-BB
<amsat-bb@?????.???>, wrote:
> What would be really helpful is for the amsat summary page to be updated
with a table of common AOS/TCA/LOS frequencies for each Sat.
>
> I don't have my notes but IIRC there were 1 or 2 (SO-50 an/or perhaps
AO-85?) which were off from the original published center freq's (then again,
> perhaps I'm not remembering correctly).
>
> Rob KA2CZU
>
>
> On Monday, May 7, 2018, 7:26:13 AM EDT, Roy Dean <royldean@?????.???> wrote:
>
> https://www.amsat.org/fm-satellite-frequency-summary/
>
> --Roy
> K3RLD
>
>
>
> >
> > Hi, I'm programming the channels of a 2m/70cm HT and I need to update the
> > FM frequency of sats both in 2m and 70 cm. I know there are new birds and
> > I don't know the freq. Thank's in advance. Carlos A. Santamaria
> > CO2JC
> _______________________________________________
> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Mon, 7 May 2018 22:57:52 +0000 (UTC)
From: Steve Bossert <k2gog@?????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: [amsat-bb] NASA Helical Antenna Question
Message-ID: <1179350283.930752.1525733872665@????.?????.???>
Content-Type: text/plain; charset=UTF-8
I am curious about the helical antenna in the article just released late
last month:
https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-space-station-emergenc
y-communications-ground-stations
This one:
https://www.nasa.gov/sites/default/files/thumbnails/image/upgradedvhf-antenna.
jpg?
While I await a reply from the article author, I wonder if anyone may have
some details on this antenna.?
Looks like a good candidate as a functional lawn ornament that is not
another QFH for more garden modern art satellite installation.? I would like
to author a construction and theory article for the HVDN.org? website in the
"notebook" section.???
Thanks,?
Steve?
Steve Bossert?K2GOG@?????.????????????????
------------------------------
Message: 4
Date: Mon, 7 May 2018 19:02:12 -0400
From: John Brier <johnbrier@?????.???>
To: Steve Bossert <k2gog@?????.???>
Cc: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID:
<CALn0fKPzpxdWZGQbGG94zNJ9w51N5H0r1KmBmbJaQGCuu7XeSw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I was also curious about that antenna, and that they only have two
stations, one on the west coast and one on the east, with one not even
having directional antennas. Would that really provide them the
coverage they need? I guess it must and there is something I am
missing.
73, John Brier KG4AKV
On Mon, May 7, 2018 at 6:57 PM, Steve Bossert via AMSAT-BB
<amsat-bb@?????.???> wrote:
> I am curious about the helical antenna in the article just released late
last month:
>
https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-space-station-emergenc
y-communications-ground-stations
>
> This one:
>
https://www.nasa.gov/sites/default/files/thumbnails/image/upgradedvhf-antenna.
jpg
>
> While I await a reply from the article author, I wonder if anyone may have
some details on this antenna.
> Looks like a good candidate as a functional lawn ornament that is not
another QFH for more garden modern art satellite installation. I would like
to author a construction and theory article for the HVDN.org website in the
"notebook" section.
>
> Thanks,
> Steve
> Steve Bossert K2GOG@?????.??? 914-573-1799
> _______________________________________________
> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Mon, 7 May 2018 19:39:52 -0400
From: Glenn Little WB4UIV <glennmaillist@?????????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID: <cbd3ef79-7584-2799-9a0f-de25f97aa5b5@?????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Looks like a standard 8 turn, axial mode, helix to me.
see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
Looks like about 8 dBi gain.
73
Glenn
WB4UIV
On 5/7/2018 6:57 PM, Steve Bossert via AMSAT-BB wrote:
> I am curious about the helical antenna in the article just released late
last month:
>
https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-space-station-emergenc
y-communications-ground-stations
>
> This one:
>
https://www.nasa.gov/sites/default/files/thumbnails/image/upgradedvhf-antenna.
jpg
>
> While I await a reply from the article author, I wonder if anyone may have
some details on this antenna.
> Looks like a good candidate as a functional lawn ornament that is not
another QFH for more garden modern art satellite installation.? I would like
to author a construction and theory article for the HVDN.org? website in the
"notebook" section.
>
> Thanks,
> Steve
> Steve Bossert?K2GOG@?????.????????????????
> _______________________________________________
> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@????.??? AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
------------------------------
Message: 6
Date: Tue, 8 May 2018 11:51:08 +1000
From: John Mac <vk2fak@?????.???>
To: Glenn Little WB4UIV <glennmaillist@?????????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID:
<CANiF7qMDE5HvPtu+9c5P6gQ3VfC4n3=1PeEai3x7qW9umUjWQA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi.
Not sure its a standard 8 turn helix, the feed looks totally different and
looks like it has a ring reflector..
John
On Tue, May 8, 2018 at 9:39 AM, Glenn Little WB4UIV <
glennmaillist@?????????.???> wrote:
> Looks like a standard 8 turn, axial mode, helix to me.
>
> see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
>
> Looks like about 8 dBi gain.
>
> 73
> Glenn
> WB4UIV
>
>
>
> On 5/7/2018 6:57 PM, Steve Bossert via AMSAT-BB wrote:
>
>> I am curious about the helical antenna in the article just released late
>> last month:
>> https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-spac
>> e-station-emergency-communications-ground-stations
>>
>> This one:
>> https://www.nasa.gov/sites/default/files/thumbnails/image/
>> upgradedvhf-antenna.jpg
>>
>> While I await a reply from the article author, I wonder if anyone may
>> have some details on this antenna.
>> Looks like a good candidate as a functional lawn ornament that is not
>> another QFH for more garden modern art satellite installation. I would
>> like to author a construction and theory article for the HVDN.org website
>> in the "notebook" section.
>>
>> Thanks,
>> Steve
>> Steve Bossert K2GOG@?????.??? 914-573-1799
>> _______________________________________________
>> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
>
> --
> -----------------------------------------------------------------------
> Glenn Little ARRL Technical Specialist QCWA LM 28417
> Amateur Callsign: WB4UIV wb4uiv@????.??? AMSAT LM 2178
> QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
> "It is not the class of license that the Amateur holds but the class
> of the Amateur that holds the license"
>
>
> _______________________________________________
> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 7
Date: Mon, 7 May 2018 22:03:12 -0400
From: Robert Bruninga <bruninga@????.???>
To: John Mac <vk2fak@?????.???>
Cc: amsat bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID:
<CALdCfNJeFzohO5fjg65rwU8gQW6KM6X2XYfMY5aZgjLMZ+z56Q@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
>> Looks like a standard 8 turn, axial mode, helix to me.
>> see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
>
> Looks like about 8 dBi gain.
>> Looks like a good candidate as a functional lawn ornament that is not
>> I would like to author a construction and theory article...
.
Thats an awful lot of hardware just for 8 dBi gain!
You can get that with a 4 element yagii.
I dont think the helix makes any sense for ham bands because the main
advantage of the helix is broadband, meaning one design can operate with
low SWR over about 20% or say from 130 to 160 Mhz. A yagii can always do
much better four our narrow bands.
my opinion anyway...
bob
WB4APR
------------------------------
Message: 8
Date: Tue, 8 May 2018 16:30:18 +1200
From: "Wendy and Terry Osborne" <wandtosborne@?????.???>
To: "John Mac" <vk2fak@?????.???>, "Glenn Little WB4UIV"
<glennmaillist@?????????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID: <C88DF81653B44589A2180E6FA69412FE@??????????>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi,
Yes, it's an 8 turn helix with a Gamma match (50 ohms to 120 ohms).
The advantages of ring reflector are in an IEEE Transactions paper
somewhere. (about 25 years ago?).
Not sure what the VHF 1 and VHF 2 frequencies are but if they are more than
a few MHz apart, that would explain the use of a helix
rather than a crossed yagi antenna.
The other picture (existingvhf.jpg) on the web page shows a 4 crossed yagi
array with rotators.
73,
Terry Osborne ZL2BAC
-----Original Message-----
From: John Mac
Sent: Tuesday, May 08, 2018 1:51 PM
To: Glenn Little WB4UIV
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Hi.
Not sure its a standard 8 turn helix, the feed looks totally different and
looks like it has a ring reflector..
John
On Tue, May 8, 2018 at 9:39 AM, Glenn Little WB4UIV <
glennmaillist@?????????.???> wrote:
> Looks like a standard 8 turn, axial mode, helix to me.
>
> see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
>
> Looks like about 8 dBi gain.
>
> 73
> Glenn
> WB4UIV
>
>
>
> On 5/7/2018 6:57 PM, Steve Bossert via AMSAT-BB wrote:
>
>> I am curious about the helical antenna in the article just released late
>> last month:
>> https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-spac
>> e-station-emergency-communications-ground-stations
>>
>> This one:
>> https://www.nasa.gov/sites/default/files/thumbnails/image/
>> upgradedvhf-antenna.jpg
>>
>> While I await a reply from the article author, I wonder if anyone may
>> have some details on this antenna.
>> Looks like a good candidate as a functional lawn ornament that is not
>> another QFH for more garden modern art satellite installation. I would
>> like to author a construction and theory article for the HVDN.org
>> website
>> in the "notebook" section.
>>
>> Thanks,
>> Steve
>> Steve Bossert K2GOG@?????.??? 914-573-1799
>> _______________________________________________
>> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
>
> --
> -----------------------------------------------------------------------
> Glenn Little ARRL Technical Specialist QCWA LM 28417
> Amateur Callsign: WB4UIV wb4uiv@????.??? AMSAT LM 2178
> QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
> "It is not the class of license that the Amateur holds but the class
> of the Amateur that holds the license"
>
>
> _______________________________________________
> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Tue, 8 May 2018 02:20:48 -0400
From: aj9n@???.???
To: amsat-bb@?????.???
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2018-05-08
06:30 UTC
Message-ID: <1633e68d725-1dae-80d@?????????????.???.???????.???>
Content-Type: text/plain; charset=utf-8
Upcoming ARISS Contact Schedule as of 2018-05-08 06:30 UTC
Quick list of scheduled contacts and events:
?
Mooreland Heights Elementary, Knoxville, TN, direct via WA4SXM/N4CFB
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Ricky Arnold KE5DAU
Contact was successful: Mon 2018-05-07 13:54:10 UTC 23 deg (***)
?
University of the Philippines Integrated School, Quezon City, Philippines,
telebridge via W6SRJ (***)
The ISS callsign is presently scheduled to be NA1SS (***)
The scheduled astronaut is Scott Tingle KG5NZA (***)
Contact is a go for: Tue 2018-05-15 08:22:45 UTC 24 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@?????.??? or aj9n@???.???.
?
Listen for the ISS on the downlink of 145.8? MHz.
?
******************************************************************************
*
?
All ARISS contacts are made via the Kenwood 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@?????????.???
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:?
Francesco IK?WGF with 132
Satoshi 7M3TJZ with 128
Gaston ON4WF with 123
Sergey RV3DR with 103
****************************************************************************
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 8601 date and
time format? YYYY-MM-DD HH:MM:SS
The complete schedule page has been updated as of?2018-05-08 06:30 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
http://www.amsat.org/amsat/ariss/news/arissnews.txt
Total number?of ARISS ISS to earth school events is 1227. ?(***)
Each school counts as 1?event.
Total number of ARISS ISS to earth school contacts is 1176. ?(***)
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:
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 2018-05-08 06:30 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. 54 on orbit
Scott Tingle KG5NZA
Norishige Kanai
Anton Shkaplerov
?
Exp. 55 on orbit
Drew Feustel
Oleg Artemyev
Ricky Arnold KE5DAU
****************************************************************************
73,
Charlie?Sufana AJ9N
One of the ARISS operation team mentors
?
?
?
?
?
?
?
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?
?
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?
?
?
------------------------------
Message: 10
Date: Tue, 8 May 2018 08:14:40 +0100
From: Graham Shirville <g.shirville@??????????.???>
To: AMSAT <amsat-bb@?????.???>, "funcube@???????????.??.???
<funcube@???????????.??.??>
Subject: [amsat-bb] FUNcube-1 mode change
Message-ID: <ebffc6c2-4ea7-013a-9f8d-a6191257003c@??????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi All,
FUNcube-1 is now operating in autonomous mode until Friday evening (UTC).
The transponder will be on in eclipse and switch to high power telemetry
only when in sunlight.
73
Graham
G3VZV
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Message: 11
Date: Tue, 8 May 2018 14:51:29 +0200
From: Nico Janssen <hamsat@??????.??>
To: Wendy and Terry Osborne <wandtosborne@?????.???>, k2gog@?????.???
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] NASA Helical Antenna Question
Message-ID: <086ef432-1229-c295-03a0-07de4e2e17da@??????.??>
Content-Type: text/plain; charset=utf-8; format=flowed
VHF 1 is 143.625 MHz (the standard Russian ISS downlink frequency) and
VHF 2 is 130.165 MHz (the Soyuz downlink frequency).
The gain of this 8 turn helix should be about 13 dBic.
I once built a 9 turn helix for 2 m. Worked very well.
73,
Nico PA0DLO
On 08-05-18 06:30, Wendy and Terry Osborne wrote:
> Hi,
>
> Yes, it's an 8 turn helix with a Gamma match (50 ohms to 120 ohms).
> The advantages of ring reflector are in an IEEE Transactions paper
> somewhere. (about 25 years ago?).
> Not sure what the VHF 1 and VHF 2 frequencies are but if they are more
> than a few MHz apart, that would explain the use of a helix
> rather than a crossed yagi antenna.
>
> The other picture (existingvhf.jpg) on the web page shows a 4 crossed
> yagi array with rotators.
>
> 73,
> Terry Osborne ZL2BAC
>
>
> -----Original Message----- From: John Mac
> Sent: Tuesday, May 08, 2018 1:51 PM
> To: Glenn Little WB4UIV
> Cc: amsat-bb@?????.???
> Subject: Re: [amsat-bb] NASA Helical Antenna Question
>
> Hi.
>
> Not sure its a standard 8 turn helix, the feed looks totally different
> and
> looks like it has a ring reflector..
>
> John
>
> On Tue, May 8, 2018 at 9:39 AM, Glenn Little WB4UIV <
> glennmaillist@?????????.???> wrote:
>
>> Looks like a standard 8 turn, axial mode, helix to me.
>>
>> see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
>>
>> Looks like about 8 dBi gain.
>>
>> 73
>> Glenn
>> WB4UIV
>>
>>
>>
>> On 5/7/2018 6:57 PM, Steve Bossert via AMSAT-BB wrote:
>>
>>> I am curious about the helical antenna in the article just released
>>> late
>>> last month:
>>> https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-spac
>>> e-station-emergency-communications-ground-stations
>>>
>>> This one:
>>> https://www.nasa.gov/sites/default/files/thumbnails/image/
>>> upgradedvhf-antenna.jpg
>>>
>>> While I await a reply from the article author, I wonder if anyone may
>>> have some details on this antenna.
>>> Looks like a good candidate as a functional lawn ornament that is not
>>> another QFH for more garden modern art satellite installation.? I would
>>> like to author a construction and theory article for the HVDN.org
>>> website
>>> in the "notebook" section.
>>>
>>> Thanks,
>>> Steve
>>> Steve Bossert K2GOG@?????.??? 914-573-1799
>>> _______________________________________________
>>> 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: http://www.amsat.org/mailman/listinfo/amsat-bb
>>>
>>
>> --
>> -----------------------------------------------------------------------
>> Glenn Little??????????????? ARRL Technical Specialist?? QCWA? LM 28417
>> Amateur Callsign:? WB4UIV??????????? wb4uiv@????.?????? AMSAT LM 2178
>> QTH:? Goose Creek, SC USA (EM92xx)? USSVI LM?? NRA LM?? SBE ARRL TAPR
>> "It is not the class of license that the Amateur holds but the class
>> of the Amateur that holds the license"
>>
>>
------------------------------
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AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
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------------------------------
End of AMSAT-BB Digest, Vol 13, Issue 158
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