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TEVEL-3
by david.greenberg 11 Sep '23

11 Sep '23

Hello All, TEVEL-3 FM transponder has been activated, starting from today, 11.09.23 19:44U for 72 hours.73,David 4X1DGנשלח מה-Galaxy שלי

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TEVEL satellites
by david.greenberg 11 Sep '23

11 Sep '23

Hi All,A short update.The current situatin is that TEVEL-5,6,7 are close to each other an have an ovelapping condition. So, only one of them can be activated, until they separate from each other.TEVEL-4 has stopped trnsmitting beacons a few weeks ago and is not responding to reset commands. This has happened in the past and the sat has returned to transmit after about two weeks.We still hope to hear it soon.We are also trying to resolve the TEVEL-8 issues.נשלח מה-Galaxy שלי73,David 4X1DG

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AMSAT-UK Colloquium 2023 – Call For Speakers
by David Johnson 11 Sep '23

11 Sep '23

Hi, This is a call for speakers for the AMSAT-UK International Space Colloquium 2023 to be held as part of the RSGB Convention on October 14-15 at the Kents Hill Park Conference Centre, Timbold Drive, Milton Keynes, MK7 6BZ. https://amsat-uk.org/colloquium/ AMSAT-UK invite speakers, about amateur radio, space and associated activities, for this event. Submissions should be sent via e-mail: to dave at g4dpz.me.uk AMSAT-UK also invites anyone with requests for Program Topics to submit them as soon as possible. Likewise if anyone knows of a good speaker on subjects of interest to the audience, please send us details. 73 Dave Johnson, G4DPZ Joint Hon. Sec. AMSAT-UK

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Cross Polarized Yagi: X or +
by Kenny Heernaert 11 Sep '23

11 Sep '23

It doesn’t matter how the antenna is mounted , either X or + . The best way to find out where a conductive crossboom passes the antenna is to make simulation with NEC , within the software you can adapt the length/diameter/position of the crossboom and find the spot where the interaction is less . An advantage of mounting the antenna in + configuration that you can start from a V/H polarized antenna and can use this polarizations as well . An X mounted is more complex to achieve V/H , but then the X has the advantage of having all possible polarizations such as : V/H/-45/+45° . Best regards, Kenny ON4DPX Van: K4IDC via AMSAT-BB [mailto:[email protected]] Verzonden: zondag 10 september 2023 23:54 Aan: AMSAT-BB <amsat-bb(a)amsat.org> Onderwerp: [AMSAT-BB] Cross Polarized Yagi: X or + I'm new to this mode.. I was advised by someone I think is knowledgeable, and certainly more so than me, to orient my cross polarized 2m Yagi so that the elements resemble an X rather than a +. Easily enough done...what's the advantage? It's my understanding that the two sets of elements are out of phase by 90° & combined at the common feed point to emulate circular polarization. How does the rotation along the boom axis make a difference? Seeking understanding... Thanks, Robin Midgett K4IDC

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Re: Cross Polarized Yagi: X or +
by Joseph B. Fitzgerald 11 Sep '23

11 Sep '23

The idea is that there will me minimal coupling to the mast that supports it, and therefore minimizing any pattern distortion. This is considered simpler than alternative of fiberglass or wood mast. de KM1P Joe

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Re: Cross Polarized Yagi: X or +
by Gary 10 Sep '23

10 Sep '23

Mounting on a metal crossboom is fine, as long as you avoid the couple of spots pointed out in the paper referenced below. The manufacturers may have thought that too difficult to explain, or thought people would disregard the positioning. Maybe they had a deal with someone who made the fiberglass crossbooms. I do not know. I do know a metal crossboom as described in Kent's paper can work very well as was actually measured on an antenna range. 73, Joe kk0sd From: Calvin McDonald via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Sunday, September 10, 2023 6:20 PM To: AMSAT-BB <amsat-bb(a)amsat.org> Subject: [AMSAT-BB] Re: Cross Polarized Yagi: X or + I was under the impression that it didn't matter how that antenna was oriented (it circular) and that a conductive mast shouldn't be used. From the manual for the M2 circular polarized 70cm yagi: "The 436CP30 is a circular polarized antenna and creates a field in all planes or polarities. Performance DETERIORATES SIGNIFICANTLY if it is mounted on a metal (conductive) mast or cross boom. A mast or cross boom of any NON-CONDUCTIVE material must be used. Fiberglass is the prime choice for its strength and weather resistance. Mount the 436CP30 so that element tips are at least 12" from any conductive material (mast, tower, feed line, etc.)." Cal - N7AY On 9/10/2023 4:39 PM, Gary via AMSAT-BB wrote: It will allow you to use a conductive crossboom, and/or route your feedline back out of the antennas along the crossboom. Antenna guru Kent Britain, wa5vjb studied and tested this. He wrote a paper on it and published it as part of an AMSAT symposium. You can see the paper here: Using Metal Cross Booms w/ Satellite Antennas (kk0sd.net)<http://www.kk0sd.net/metalboom/metalboom.htm> 73, Joe kk0sd From: K4IDC via AMSAT-BB <amsat-bb(a)amsat.org><mailto:[email protected]> Sent: Sunday, September 10, 2023 4:54 PM To: AMSAT-BB <amsat-bb(a)amsat.org><mailto:[email protected]> Subject: [AMSAT-BB] Cross Polarized Yagi: X or + I'm new to this mode.. I was advised by someone I think is knowledgeable, and certainly more so than me, to orient my cross polarized 2m Yagi so that the elements resemble an X rather than a +. Easily enough done...what's the advantage? It's my understanding that the two sets of elements are out of phase by 90° & combined at the common feed point to emulate circular polarization. How does the rotation along the boom axis make a difference? Seeking understanding... Thanks, Robin Midgett K4IDC ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://mailman.amsat.org/>

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Re: Cross Polarized Yagi: X or +
by Calvin McDonald 10 Sep '23

10 Sep '23

I was under the impression that it didn't matter how that antenna was oriented (it circular) and that a conductive mast shouldn't be used. From the manual for the M2 circular polarized 70cm yagi: “The 436CP30 is a circular polarized antenna and creates a field in all planes or polarities. Performance DETERIORATES SIGNIFICANTLY if it is mounted on a metal (conductive) mast or cross boom. A mast or cross boom of any NON-CONDUCTIVE material must be used. Fiberglass is the prime choice for its strength and weather resistance. Mount the 436CP30 so that element tips are at least 12” from any conductive material (mast, tower, feed line, etc.).” Cal - N7AY On 9/10/2023 4:39 PM, Gary via AMSAT-BB wrote: > > It will allow you to use a conductive crossboom, and/or route your > feedline back out of the antennas along the crossboom. Antenna guru > Kent Britain, wa5vjb studied and tested this. He wrote a paper on it > and published it as part of an AMSAT symposium. You can see the paper > here: > > Using Metal Cross Booms w/ Satellite Antennas (kk0sd.net) > <http://www.kk0sd.net/metalboom/metalboom.htm> > > 73, > > Joe kk0sd > > *From:* K4IDC via AMSAT-BB <amsat-bb(a)amsat.org> > *Sent:* Sunday, September 10, 2023 4:54 PM > *To:* AMSAT-BB <amsat-bb(a)amsat.org> > *Subject:* [AMSAT-BB] Cross Polarized Yagi: X or + > > I'm new to this mode.. > > I was advised by someone I think is knowledgeable, and certainly more > so than me, to orient my cross polarized 2m Yagi so that the elements > resemble an X rather than a +. Easily enough done...what's the advantage? > > It's my understanding that the two sets of elements are out of phase > by 90° & combined at the common feed point to emulate circular > polarization. How does the rotation along the boom axis make a difference? > > Seeking understanding... > > Thanks, > > Robin Midgett K4IDC > > > ----------------------------------------------------------- > > Sent via AMSAT-BB(a)amsat.org. 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. > Acceptable Use and Privacy Policies available athttps://www.amsat.org/about-amsat/ > > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to amsat-bb-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org

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Re: Cross Polarized Yagi: X or +
by Gary 10 Sep '23

10 Sep '23

It will allow you to use a conductive crossboom, and/or route your feedline back out of the antennas along the crossboom. Antenna guru Kent Britain, wa5vjb studied and tested this. He wrote a paper on it and published it as part of an AMSAT symposium. You can see the paper here: Using Metal Cross Booms w/ Satellite Antennas (kk0sd.net)<http://www.kk0sd.net/metalboom/metalboom.htm> 73, Joe kk0sd From: K4IDC via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Sunday, September 10, 2023 4:54 PM To: AMSAT-BB <amsat-bb(a)amsat.org> Subject: [AMSAT-BB] Cross Polarized Yagi: X or + I'm new to this mode.. I was advised by someone I think is knowledgeable, and certainly more so than me, to orient my cross polarized 2m Yagi so that the elements resemble an X rather than a +. Easily enough done...what's the advantage? It's my understanding that the two sets of elements are out of phase by 90° & combined at the common feed point to emulate circular polarization. How does the rotation along the boom axis make a difference? Seeking understanding... Thanks, Robin Midgett K4IDC

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Cross Polarized Yagi: X or +
by K4IDC 10 Sep '23

10 Sep '23

I'm new to this mode.. I was advised by someone I think is knowledgeable, and certainly more so than me, to orient my cross polarized 2m Yagi so that the elements resemble an X rather than a +. Easily enough done...what's the advantage? It's my understanding that the two sets of elements are out of phase by 90° & combined at the common feed point to emulate circular polarization. How does the rotation along the boom axis make a difference? Seeking understanding... Thanks, Robin Midgett K4IDC

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ARISS News Release 23-46
by David Jordan 10 Sep '23

10 Sep '23

ARISS News Release No.23-46 Dave Jordan, AA4KN ARISS PR aa4kn(a)amsat.org FORIMMEDIATE RELEASE ARISSContact is Scheduled with Students at ESPRIT: Private Higher School of Engineering and Technology, Little Ariana,Tunisia September9, 2023—Amateur Radio on the International Space Station (ARISS) has receivedschedule confirmation for an ARISS radio contact between an astronaut aboardthe International Space Station (ISS) and students at ESPRIT in Little Ariana,Tunisia. ARISS conducts 60-80 of thesespecial amateur radio contacts each year between students around the globe andcrew members with ham radio licenses aboard the ISS. ESPRIT, founded in 2003, is an engineering school that providesstudy in various fields, notably: IT, Civil Engineering, Electromechanics andBusiness. The school has a curriculum focused on hands-on Problem basedlearning accompanied by on-going hands-on courses, which are updated yearly tothe latest innovative technologies. With about 10,000 students, ESPRIT is alsoa member of the Honoris United Universities that has more than 61,000 students fromabout 10 African countries. ESPRIT has a local aerospace and satellite organization (IEEEAEROSPACE AND ELECTRONIC SYSTEMS SOCIETY – IEEE Student Branch Chapter) thatwas founded in 2017 and has 628 members. As a sponsor of this ARISS contact,ESPRIT hopes to inspire students in these fields. This will be a telebridge Contact via Amateur Radio allowing students to ask theirquestions of Astronaut Andreas Mogensen, amateur radio call sign KG5GCZ. Thedownlink frequency for this contact is 145.800 MHz and may be heard bylisteners that are within the ISS-footprint that also encompasses thetelebridge station. The ARISS amateur radio ground station(telebridge station) for this contact is in Greenbelt, Maryland, U.S. Theamateur radio volunteer team at the ground station will use the callsign K6DUE,to establish and maintain the ISS connection. TheARISS radio contact is scheduled for September 12, 2023 at 10:01:58 am CET (Tunisia)(9:01:58 UTC, 5:01 am EDT, 4:01 am CDT,3:01 am MDT, 2:01 am PDT). _______________________________ Astime allows, students will ask these questions: 1.What was the most surprising thing you noticed about Earth from space? 2.What is the most advanced technology we can find only on the ISS? 3.What do you do for fun in space? 4.How do you manage to stay connected with your loved ones while on the ISS? 5.Do space simulations on earth do the real thing justice? 6.What's the thing that you wish you bought with the first time you've been tothe space station? 7.What’s the most exciting thing that happened during one of your missions? 8.Is there anything in space that has surprised you since you became anastronaut? 9.What thoughts have you experienced in space, that you never contemplated onearth? 10.What does the ISS smell like? 11.Why do astronauts have mirrors on their gloves? 12.How do you handle emergencies in space? 13.How long did it take for you to get accustomed with life on board the ISS? 14.What do you like most about living in space? 15.What's the thing that was the opposite of your expectations when you wentthere? 16.When there are so many galaxies in the universe, are we sure we are alone? 17.As we explore other habitable planets, do you think when future astronauts returnto Earth they might not find it as exciting? 18.What did you feel when you looked down at earth for the first time? 19.Galaxies look stationary, so why do scientists say that they rotate? 20.What is the feeling when travelling at the speed of 28000 km/h? About ARISS: Amateur Radio on the InternationalSpace Station (ARISS) is a cooperative venture of international amateur radiosocieties and the space agencies that support the International Space Station(ISS). In the United States, sponsors are the American Radio Relay League(ARRL), Amateur Radio Digital Communications (ARDC), Radio Amateur SatelliteCorporation (AMSAT), NASA’s Space Communications and Navigation program (SCaN)and the ISS National Lab—Space Station Explorers. The primary goal of ARISS isto promote exploration of science, technology, engineering, the arts, andmathematics topics. ARISS does this by organizing scheduled contacts viaamateur radio between crew members aboard the ISS and students. Before andduring these radio contacts, students, educators, parents, and communities takepart in hands-on learning activities tied to space, space technologies, andamateur radio. For more information, see http://www.ariss.org . MediaContact: DaveJordan, AA4KN ARISSPR Findus on social media at: Twitter:ARISS_Intl Facebook:facebook.com/ARISSIntl Instagram:ariss_intl Mastodon:[email protected] Checkout ARISS on Youtube.com.

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