June 2012 - AMSAT-BB - mailman.amsat.org

Raspberry Pi + Interplanetary CubeSat Workshop Videos
by Trevor . 07 Jun '12

07 Jun '12

The $35 Raspberry Pi ARM-based computer board has been used to run the GPredict satellite tracking software See http://www.uk.amsat.org/?p=8019 AMSAT-UK FunCube Dongle receiving HORYU-2 Satellite video http://www.uk.amsat.org/?p=8016 1st Interplanetary CubeSat Workshop presentations and videos available http://www.uk.amsat.org/?p=8011 73 Trevor M5AKA AMSAT-UK News on Twitter http://twitter.com/AMSAT_UK ----

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Paccomm Spirit 2
by Alan Beck 06 Jun '12

06 Jun '12

Hey, I just got my manual for the Spirit-2 packet controller that I was sold for $15.00. As far as I can tell it says nothing about modes of operation. When I called and asked they could tell me what kind of stuff it can do but they did not mention GMSK which is what I am interested in doing. I need help here guys, I at least want to monitor the GMSK stuff and perhaps pacsat when it comes to life again, perhaps. Looks to me like I am going to look for a used radio that interfaces with tracking programs. As far as the cost for this venture, $190.00 + $15.00 was not bad to come up to nothing. 73, Alan

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W5PFG/R grid operations for June
by Clayton Coleman W5PFG 06 Jun '12

06 Jun '12

I will be doing a little grid expedition in late June through numerous grids. These are not all rare but anyone who has worked me previously knows I will QSL via paper and Logbook of the World. Email me directly if there are specific grids in this list you need/want and I will try my best to set a schedule with you. I plan to operate AO-27, SO-50, and FO-29. It is not guaranteed I will operate from all of these grids but they have significant coverage of the roads I'll be running. EM32, EM42, EM52, EM62, EM63, EM74, EM75, EM86, EM96, EM97, FM07 FM08, FM19, FN10, FN20, FN30, FN32, FN41, FN42 73 Clayton W5PFG

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LVB Tracker
by Thomas Doyle 06 Jun '12

06 Jun '12

Looking for someone with the right stuff - an LVB Tracker controlling their rotors - a Computer running Windows 7 - slightly above average computer skills who is willing to take a few minutes to test a piece of software for me. tnx & 73 W9KE Tom Doyle

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Sorry No Grid Expedition to EN-0X today
by Gary "Joe" Mayfield 06 Jun '12

06 Jun '12

Wife gave me a long list of things to be completed before leaving today. No way I will have time for the detour L Maybe next time. 73, Joe kk0sd

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Re: 1K grids
by K5OE 05 Jun '12

05 Jun '12

WhiIle I did have a dozen left over from 2003 on AO-40 (SK). a few new grids can be attributed to "modern" rovers, including ND9M, WD9EWK, and W5PFG. However, most of these new grids are credited to Yuri, UT1FG. Yuri was/is a great op, often on multiple overnight FO-29 passes (ZZZZZZZ) when in range. I worked him sporatically during daylight hours due to work, but was ever so grateful to give up a little sleep for such rare wet grids as he so generoursly provided. Also worthy of a Best Supporting Actor Award is Eugene, UT0FY, who is Yuri's QSL manager. If there was ever a reason to improve your satellite station, it is to get ready for his next trip once his summer vacation is over in Ukraine :-) 73, Jerry, K5OE KK5DO writes: > Congrats to Jerry, K5OE. He just submitted his VUCC upgrade to 1,000 grids > today, actually 1,008 but who';s counting. > > It was an easy set of cards to check. About 30 from a bunch of hams and 100 or > so grids from Yuri. Not a bad haul. and... I have never worked Yuri on > satellite. > >73...bruce

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Watch Venus Transit Online
by Clint Bradford 05 Jun '12

05 Jun '12

Let's see how messed up this attempt to share URLs comes out (grin). Here are a few online sites to watch Venus next week. <a href="http://venustransit.nasa.gov/2012/transit/" target="_blank">NASA</a></li> <a href="http://www.nasa.gov/multimedia/podcasting/nasaedge/index.html" target="_blank">NASA Edge</a></li> <a href="https://gaia.am.ub.es/serviastro/www/html/venus2012/live/index.html" target="_blank">University of Barcelona</a> (from a telescope in Norway)</li> <a href="http://venustransit.nso.edu/live.html" target="_blank">National Solar Observatory</a></li> San Francisco's <a href="http://www.exploratorium.edu/venus/" target="_blank">Exploratorium</a> (via the Mauna Loa Observatory)</li> <a href="http://www.nasa.gov/ntv" target="_blank">NASA TV</a></li> <a href="http://www.ccssc.org/transit2012.html" target="_blank">Coca Cola Space Science Center</a> (from Australia)</li> <a href="http://www.bareket-astro.com/live-astronomical-web-cast/live-free-venus-tra…" target="_blank">Bareket observatory</a> (Israel)</li> <a href="http://skycenter.arizona.edu/annoucement/live" target="_blank">Mt. Lemmon Sky Center</a></li> <a href="http://www.astronomerswithoutborders.org/projects/transit-of-venus/live-web…" target="_blank">Astronomers Without Borders</a> (from Mt. Wilson, California) Clint Bradford, K6LCS 909-241-7666

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STRaND-2 and OSCAR-5 in SatMagazine
by Trevor . 05 Jun '12

05 Jun '12

The STRaND-2 nanosats feature in the June issue of the free publication SatMagazine on pages 25-26. Additionally on page 71 there is a picture of the satellite OSCAR-5 that was built by radio amateurs at the University of Melbourne, Australia. See http://www.uk.amsat.org/7990 73 Trevor M5AKA AMSAT-UK http://www.uk.amsat.org/ ----

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Re: PA5RWE passed away
by William Leijenaar 05 Jun '12

05 Jun '12

Hi AMSATs, I met Chris only a few times, but he was always very devoted to the ham hobby. We shared the interrest in amateur satellites, and he made records of the satellite downlink from his shack in The Netherlands while Dirk (ON1DLL) and me were travelling around Europe and making satellite contacts. You will not be forgotten. My condolences to his family and friends, William Leijenaar, PE1RAH

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Re: AMSAT-BB Digest, Vol 7, Issue 179
by tokens＠myranch.com 04 Jun '12

04 Jun '12

Just checked again and actually I have HI confirmed on 6 and I worked that ZF before on 6, no QSL. KHP -----Original Message----- From: amsat-bb-request(a)amsat.org Sent: Monday, June 04, 2012 3:00 PM To: amsat-bb(a)amsat.org Subject: AMSAT-BB Digest, Vol 7, Issue 179 Send AMSAT-BB mailing list submissions to amsat-bb(a)amsat.org To subscribe or unsubscribe via the World Wide Web, visit http://amsat.org/mailman/listinfo/amsat-bb or, via email, send a message with subject or body 'help' to amsat-bb-request(a)amsat.org You can reach the person managing the list at amsat-bb-owner(a)amsat.org When replying, please edit your Subject line so it is more specific than "Re: Contents of AMSAT-BB digest..." Today's Topics: 1. Re: Icom Power Cord (Clint Bradford) 2. A great suggestion (Thomas Doyle) 3. 1K grids (Bruce) 4. Re: full duplex w/ 2 HT's (Ronald Nutter) 5. Re: full duplex w/ 2 HT's (Greg D) 6. Re: A great suggestion (Clint Bradford) 7. Re: European Lunar Lander - Call for Declarations (Stefan Wagener) 8. Re: European Lunar Lander - Call for Declarations (i8cvs) 9. Re: European Lunar Lander - Call for Declarations (Jari Koivurinne) 10. Re: full duplex w/ 2 HT's (Andrew Glasbrenner) 11. nitinol wire vs steel tape (Nick Pugh) 12. Re: full duplex w/ 2 HT's (Dobarrows) 13. Re: [CubeSat] nitinol wire vs steel tape (chantal cappelletti) ---------------------------------------------------------------------- Message: 1 Date: Sun, 3 Jun 2012 12:57:42 -0700 From: Clint Bradford <clintbrad4d(a)earthlink.net> To: amsat-bb(a)amsat.org Subject: [amsat-bb] Re: Icom Power Cord Message-ID: <095A1B02-67B6-40A6-AE56-2B533CEF27D9(a)earthlink.net> Content-Type: text/plain; charset=us-ascii I believe the IC-910 also uses the IC-OPC-657A power cord - if that helps in your searching. Clint K6LCS >> ... IC-821 ... ------------------------------ Message: 2 Date: Sun, 3 Jun 2012 15:59:58 -0500 From: Thomas Doyle <tomdoyle1948(a)gmail.com> To: AMSAT-BB(a)amsat.org Subject: [amsat-bb] A great suggestion Message-ID: <CAHnRQRKmTZgvrezjAEPOu=KW2QQmeD07=sAh_nE5+q+TbhANfQ(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 A great suggestion was made for a simple addition to the program written for demos and education. You can now add your own images to the little slide show that takes place in the lower right hand portion of the screen. This is a good way to personalize your presentation by including images that are of specific interest to your group or add images that for one reason or another are not included in the program. If any group or organization would like an image added to the gallery and/or included with the program distribution just send me your request in an email with the image attached and I will try to include it. If any registered trademark or copyright issues are involved with the image simply add a line or two to your request authorizing use of the image in this application. The updated version of the program, information on how to add your own images and a little gallery of images to try out is on the web site. http://www.tomdoyle.org/simplesatlookdown Have Fun - 73 W9KE Tom Doyle ------------------------------ Message: 3 Date: Sun, 3 Jun 2012 14:31:02 -0700 (PDT) From: Bruce <kk5do(a)arrl.net> To: amsat-bb(a)amsat.org Subject: [amsat-bb] 1K grids Message-ID: <1338759062.77954.YahooMailMobile(a)web180015.mail.gq1.yahoo.com> Content-Type: text/plain; charset=us-ascii Congrats to Jerry, K5OE. He just submitted his VUCC upgrade to 1,000 grids today, actually 1,008 but who's counting. It was an easy set of cards to check. About 30 from a bunch of hams and 100 or so grids from Yuri. Not a bad haul. and... I have never worked Yuri on satellite. 73...bruce Sent from my iPhone ------------------------------ Message: 4 Date: Sun, 03 Jun 2012 16:17:07 -0500 From: Ronald Nutter <ron.nutter(a)networkref.com> To: Robert Coppock <robertinorbit(a)webtv.net> Cc: amsat-bb(a)amsat.org Subject: [amsat-bb] Re: full duplex w/ 2 HT's Message-ID: <4FCBD453.3000401(a)networkref.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Robert: I have used a duplexer on the UHF side of my satellite ops for several years. I find that some radios have more of a desense problem than others. Here is a link to my website where I briefly talk about what I do on portable ops and using what is referred to as a Mode J filter - http://www.ka4kyi.com/satellite_gear/misc_equipment/ Ron Nutter KA4KYI AMSAT Area Coordinator for Missouri On 6/2/12 11:33 AM, Robert Coppock wrote: > > > > hola, i am trying to determine the best way to work full duplex on the > birds with 2 HT's or radios. i cannot find any info so far on the web. > my concern is to keep the transmit power out of the receive radio, i guess > basically the difference between a diplexer and duplexer. since i am > efficient (lazy) i thought i would just look for suggestions here while i > am checking google also. what do i need, di/du/ plexer, and what is the > correct wiring scheme ? i will be using the arrow antenna without the > built in duplexer, from the 2 feeds (vhf/uhf) and 2 HT's for now. my > picture of it so far, is to wire the vhf radio direct to the vhf feed port > on the arrow, and have the uhf port on the arrow come into a duplexer, > with the duplexer uhf port going to the uhf radio, and the duplexer vhf > port terminated into a 50 ohm dummy load. also, any suggestions of > specific duplexers would be appreciated. i think i started on this project > a few years ago, but never got around to get! ti! > ng it all together. grazie mille, Robert k f 0 g cn81 in the > woodwork, literally, > shasta/klamath national forests. > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. 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: 5 Date: Sun, 03 Jun 2012 19:45:36 -0700 From: Greg D <ko6th.greg(a)gmail.com> To: amsat-bb(a)amsat.org Subject: [amsat-bb] Re: full duplex w/ 2 HT's Message-ID: <4FCC2150.6050608(a)gmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed So, all the on-line information seems to point to this solution - putting a diplexer (filter) on the 70cm side to tap off and absorb the incoming 2m signal. Isn't there also a design where one puts a filter on the 2m side, to tap off and absorb the 70 cm (3rd harmonic of 2m) signal? I would think that any (reasonable) 70cm receiver would have enough rejection for a signal so far out of band, but the in-band 3rd harmonic can only be taken care of at its source. At least, I think that's the logic. Is there anything worthy about the other design, or is the most common problem that our HTs can't possibly deal with a strong 2m signal on the 70cm side because of their "DC to Daylight" receivers? I've been on the mode-J birds without much of a problem with this sort of desense, though I did have a lot of trouble on AO-40 with reflected RF when aiming through a big oak tree behind the house. The 70cm uplink was interfering with the 13cm downlink, and I was pretty sure at the time that it was a 3rd harmonic sort of problem. Just curious, Greg KO6TH Ronald Nutter wrote: > Robert: > > I have used a duplexer on the UHF side of my satellite ops for several > years. I find that some radios have more of a desense problem than > others. Here is a link to my website where I briefly talk about what I > do on portable ops and using what is referred to as a Mode J filter - > http://www.ka4kyi.com/satellite_gear/misc_equipment/ > > Ron Nutter > KA4KYI > AMSAT Area Coordinator for Missouri > > On 6/2/12 11:33 AM, Robert Coppock wrote: >> >> >> >> hola, i am trying to determine the best way to work full duplex on >> the birds with 2 HT's or radios. i cannot find any info so far on the >> web. my concern is to keep the transmit power out of the receive >> radio, i guess basically the difference between a diplexer and >> duplexer. since i am efficient (lazy) i thought i would just look for >> suggestions here while i am checking google also. what do i need, >> di/du/ plexer, and what is the correct wiring scheme ? i will be >> using the arrow antenna without the built in duplexer, from the 2 >> feeds (vhf/uhf) and 2 HT's for now. my picture of it so far, is to >> wire the vhf radio direct to the vhf feed port on the arrow, and have >> the uhf port on the arrow come into a duplexer, with the duplexer uhf >> port going to the uhf radio, and the duplexer vhf port terminated >> into a 50 ohm dummy load. also, any suggestions of specific duplexers >> would be appreciated. i think i started on this project a few years >> ago, but never got around to get! > ti! >> ng it all together. grazie mille, Robert k f 0 g cn81 in the >> woodwork, literally, shasta/klamath national forests. >> _______________________________________________ >> Sent via AMSAT-BB(a)amsat.org. 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(a)amsat.org. 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, 03 Jun 2012 20:27:33 -0700 From: Clint Bradford <clintbradford(a)mac.com> To: AMSAT BB <amsat-bb(a)amsat.org> Subject: [amsat-bb] Re: A great suggestion Message-ID: <65DC0D43-E6E0-441C-A8FA-8E9792B44E24(a)mac.com> Content-Type: text/plain; CHARSET=US-ASCII Brilliant! Great program ... accurate tracking ... simple and elegant - GREAT work, Tom. Clint Bradford K6LCS http://www.work-sat.com ------------------------------ Message: 7 Date: Mon, 4 Jun 2012 02:26:20 -0500 From: Stefan Wagener <wageners(a)gmail.com> To: i8cvs <domenico.i8cvs(a)tin.it> Cc: Amsat - BBs <amsat-bb(a)amsat.org> Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations Message-ID: <CAKu8kHCN5PQZmbDjYeqWnZcarjVi2g-qRiwueQ=uKYSt-pkPfw(a)mail.gmail.com> Content-Type: text/plain; charset=windows-1252 Thanks folks, That's a very helpful and constructive discussion. It will certainly allow for better assessment of the feasibility, options and limitations. Stefan, VE4NSA On Sat, Jun 2, 2012 at 8:54 PM, i8cvs <domenico.i8cvs(a)tin.it> wrote: > Hi Peter, DB2OS > > I was reading the document in particular point 2.2.2 > Communication and 2.2.3 but in my opinion the Radio > Hams are off side because everyting has been already > designed and in my opinion there is no room available > on the Lander for a Moon-Earth experimental communication > transponder in our L band and S band because our antennas > are too big. > > Since the main 7.2 and 8.5 GHz X band High Gain Antennas > of the Lander are oriented toward the Earth in a fixed position > to compensate the pointing for libration probably only a 5 watt > pep and a circularly polarized horn on our 10.5 GHz should be > possible. > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "Peter Guelzow" <peter.guelzow(a)kourou.de> > To: <amsat-bb(a)amsat.org> > Sent: Sunday, June 03, 2012 12:57 AM > Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations > > Hi together, > > Please also have a look at this document: > > > http://wsn.spaceflight.esa.int/docs/lunarlander/LunarLander_EIDA_CDI_230512. > pdf > > in particular see point 2.2.2 Communication and 2.2.3: > > "Visibility of the Earth from the landing site imposes the following > constraint: > ? communications shall only be possible within a 13.7 day (TBC) window > each month, and shall depend on the availability of the ground station." > > further: > > "the mean power available for an individual payload is expected not to > exceed 20W" > > 73s Peter DB2OS > > On 03.06.2012 00:29, Peter Guelzow wrote: > > > Check also this discussion from James Miller, G3RUH: > > > > http://www.amsat.org/amsat/articles/g3ruh/110.html > > > > > > 73s Peter, DB2OS > > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. 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: 8 Date: Mon, 4 Jun 2012 10:01:14 +0200 From: "i8cvs" <domenico.i8cvs(a)tin.it> To: "Stefan Wagener" <wageners(a)gmail.com> Cc: Amsat - BBs <amsat-bb(a)amsat.org> Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations Message-ID: <000001cd4228$79df1300$0401a8c0@b3o7f1> Content-Type: text/plain; charset="Windows-1252" Hi Stefan VE4NSA, Peter DB2OS and folks on BB It should be very nice to have a transponder on the Lunar Lander operating into the X/K band 10,5 GHz Uplink and 24 GHz downlink. As on AO40 the antennas are very small and probably there is room for a transponder. For a good feasibility and assesment with ESA it would be very important to have also a 24 GHz Beacon relaying to us TLM data concerning some primary ESA experiments. Just my idea. 73" de i8CVS Domenico ----- Original Message ----- From: Stefan Wagener To: i8cvs Cc: Peter Guelzow ; Amsat - BBs Sent: Monday, June 04, 2012 9:26 AM Subject: Re: [amsat-bb] Re: European Lunar Lander - Call for Declarations Thanks folks, That's a very helpful and constructive discussion. It will certainly allow for better assessment of the feasibility, options and limitations. Stefan, VE4NSA On Sat, Jun 2, 2012 at 8:54 PM, i8cvs <domenico.i8cvs(a)tin.it> wrote: Hi Peter, DB2OS I was reading the document in particular point 2.2.2 Communication and 2.2.3 but in my opinion the Radio Hams are off side because everyting has been already designed and in my opinion there is no room available on the Lander for a Moon-Earth experimental communication transponder in our L band and S band because our antennas are too big. Since the main 7.2 and 8.5 GHz X band High Gain Antennas of the Lander are oriented toward the Earth in a fixed position to compensate the pointing for libration probably only a 5 watt pep and a circularly polarized horn on our 10.5 GHz should be possible. 73" de i8CVS Domenico ----- Original Message ----- From: "Peter Guelzow" <peter.guelzow(a)kourou.de> To: <amsat-bb(a)amsat.org> Sent: Sunday, June 03, 2012 12:57 AM Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations Hi together, Please also have a look at this document: http://wsn.spaceflight.esa.int/docs/lunarlander/LunarLander_EIDA_CDI_230512. pdf in particular see point 2.2.2 Communication and 2.2.3: "Visibility of the Earth from the landing site imposes the following constraint: ? communications shall only be possible within a 13.7 day (TBC) window each month, and shall depend on the availability of the ground station." further: "the mean power available for an individual payload is expected not to exceed 20W" 73s Peter DB2OS On 03.06.2012 00:29, Peter Guelzow wrote: > Check also this discussion from James Miller, G3RUH: > > http://www.amsat.org/amsat/articles/g3ruh/110.html > > > 73s Peter, DB2OS _______________________________________________ Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ------------------------------ Message: 9 Date: Mon, 4 Jun 2012 11:32:38 +0300 From: "Jari Koivurinne" <jari.koivurinne(a)aina.net> To: "i8cvs" <domenico.i8cvs(a)tin.it> Cc: Amsat - BBs <amsat-bb(a)amsat.org> Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations Message-ID: <e4cf25caf059daa81574d170077e930e.squirrel(a)webmail.aina.net> Content-Type: text/plain;charset=iso-8859-1 Hi all There is nothing much to do with 20W mean power. Just a 5W pep beacon... -jari oh3uw > Hi Stefan VE4NSA, Peter DB2OS and folks on BB > > It should be very nice to have a transponder on the Lunar Lander operating > into the X/K band 10,5 GHz Uplink and 24 GHz downlink. As on AO40 the > antennas > are very small and probably there is room for a transponder. > > For a good feasibility and assesment with ESA it would be very important > to > have also a 24 GHz Beacon relaying to us TLM data concerning some primary > ESA > experiments. > > Just my idea. > > 73" de > > i8CVS Domenico > ------------------------------ Message: 10 Date: Mon, 4 Jun 2012 06:01:21 -0400 From: Andrew Glasbrenner <glasbrenner(a)mindspring.com> To: Greg D <ko6th.greg(a)gmail.com> Cc: "amsat-bb(a)amsat.org" <amsat-bb(a)amsat.org> Subject: [amsat-bb] Re: full duplex w/ 2 HT's Message-ID: <75438E63-EE7F-4C7E-A981-E41774EE5A15(a)mindspring.com> Content-Type: text/plain; charset=us-ascii Usually the diplexer as a filter is only needed to keep the 2m tx from overloading a 70cm preamp. For a two radio setup with no preamp, it usually isn't needed at all. 73, Drew KO4MA Sent from my iPhone On Jun 3, 2012, at 10:45 PM, Greg D <ko6th.greg(a)gmail.com> wrote: > So, all the on-line information seems to point to this solution - putting > a diplexer (filter) on the 70cm side to tap off and absorb the incoming 2m > signal. Isn't there also a design where one puts a filter on the 2m side, > to tap off and absorb the 70 cm (3rd harmonic of 2m) signal? > > I would think that any (reasonable) 70cm receiver would have enough > rejection for a signal so far out of band, but the in-band 3rd harmonic > can only be taken care of at its source. At least, I think that's the > logic. > > Is there anything worthy about the other design, or is the most common > problem that our HTs can't possibly deal with a strong 2m signal on the > 70cm side because of their "DC to Daylight" receivers? > > I've been on the mode-J birds without much of a problem with this sort of > desense, though I did have a lot of trouble on AO-40 with reflected RF > when aiming through a big oak tree behind the house. The 70cm uplink was > interfering with the 13cm downlink, and I was pretty sure at the time that > it was a 3rd harmonic sort of problem. > > Just curious, > > Greg KO6TH > > > Ronald Nutter wrote: >> Robert: >> >> I have used a duplexer on the UHF side of my satellite ops for several >> years. I find that some radios have more of a desense problem than >> others. Here is a link to my website where I briefly talk about what I do >> on portable ops and using what is referred to as a Mode J filter - >> http://www.ka4kyi.com/satellite_gear/misc_equipment/ >> >> Ron Nutter >> KA4KYI >> AMSAT Area Coordinator for Missouri >> >> On 6/2/12 11:33 AM, Robert Coppock wrote: >>> >>> >>> >>> hola, i am trying to determine the best way to work full duplex on the >>> birds with 2 HT's or radios. i cannot find any info so far on the web. >>> my concern is to keep the transmit power out of the receive radio, i >>> guess basically the difference between a diplexer and duplexer. since i >>> am efficient (lazy) i thought i would just look for suggestions here >>> while i am checking google also. what do i need, di/du/ plexer, and what >>> is the correct wiring scheme ? i will be using the arrow antenna without >>> the built in duplexer, from the 2 feeds (vhf/uhf) and 2 HT's for now. my >>> picture of it so far, is to wire the vhf radio direct to the vhf feed >>> port on the arrow, and have the uhf port on the arrow come into a >>> duplexer, with the duplexer uhf port going to the uhf radio, and the >>> duplexer vhf port terminated into a 50 ohm dummy load. also, any >>> suggestions of specific duplexers would be appreciated. i think i >>> started on this project a few years ago, but never got around to get! >> ti! >>> ng it all together. grazie mille, Robert k f 0 g cn81 in the woodwork, >>> literally, shasta/klamath national forests. >>> _______________________________________________ >>> Sent via AMSAT-BB(a)amsat.org. 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(a)amsat.org. 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(a)amsat.org. 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: 11 Date: Mon, 4 Jun 2012 05:47:29 -0500 From: "Nick Pugh" <quadpugh(a)bellsouth.net> To: <amsat-bb(a)amsat.org>, <CubeSat(a)cubesat.org> Subject: [amsat-bb] nitinol wire vs steel tape Message-ID: <095b01cd423f$70bfe710$523fb530$@net> Content-Type: text/plain; charset="us-ascii" Does anyone on the list know if there is any trade off using nitinol wire over steel tape for antennas on cube sats? Thanks nick Office 337 593 8700 Cell 337 258 2527 Helping UL become a world Class Engineering and Educational School ------------------------------ Message: 12 Date: Mon, 4 Jun 2012 11:53:01 -0400 (EDT) From: Dobarrows <dobarrows(a)aol.com> To: amsat-bb(a)amsat.org Subject: [amsat-bb] Re: full duplex w/ 2 HT's Message-ID: <8CF108141285A4D-134C-12EB6(a)webmail-m052.sysops.aol.com> Content-Type: text/plain; charset="us-ascii" My portable setup using an arrow antenna doesn't use a diplexor or duplexor. With the setup for 2m uplink, I connect my VX5R to the two meter driven element with a piece of RG-8X. I connect my Icom IC R10 to the 432 mhz driven element with another piece of RG-8X. Just turn the radios on, adjust the frequencies, and wave the antenna around until you hear the satellite on the receive radio. When I transmit and I can hear my signal in the IC-R10 I know that I may be heard. If I hear someone else in the downlink, I stop transmitting and wait for another chance Now note that my IC R10 is not a second HT, but just a receiver. You should be able to swap in a second HT for the IC R10 with no problem. Most of the time, I use a better setup by inserting a Down East Microwave preamp between the antenna and the IC R10. The preamp improves reception on the downlink considerably. By using a receive only radio with the pre amp, I don't have to worry about accidently transmitting on 432 and burning up the pre amp. I run the preamp with two six volt lantern batteries in series. When working a pass, I start with the receiver in usb mode and tuned about 10 mhz higher than the published downlink frequency. This helps me zero in on the satellite. When the signal gets better (the squawking noise listening to a FM signal with usb setting gets loud) I switch the receiver to FM and gradually tune down frequency to keep up with the doppler. I usually don't touch the transmit frequency on the VX 5R. I just keep it on the published downlink frequency for the whole pass. 73, W8IJ ------------------------------ Message: 13 Date: Mon, 4 Jun 2012 18:07:32 +0200 From: chantal cappelletti <chantal.cappelletti(a)gmail.com> To: Nick Pugh <quadpugh(a)bellsouth.net> Cc: amsat-bb(a)amsat.org, CubeSat(a)cubesat.org Subject: [amsat-bb] Re: [CubeSat] nitinol wire vs steel tape Message-ID: <CAERGK4esKyX0nVSnQkectrUMc8WzGt5yM=bB+sEwws3yDZaicA(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Dear Nick. we have tried to use the Nitinol for our CubeSat but for our experience it is better to use the steel tape. If you want to have more details please contact us: gauss.group(a)gmail.com Thanks, Chantal 2012/6/4 Nick Pugh <quadpugh(a)bellsouth.net>: > Does anyone on the list know if there is any trade off using nitinol ?wire > over steel tape for antennas on cube sats? > > > > > > > > Thanks > > > > nick > > Office?? 337 593 8700 > > Cell????? 337 258 2527 > > > > Helping UL become a world Class Engineering ?and Educational School > > > > > > > _______________________________________________ > CubeSat mailing list > CubeSat(a)cubesat.org > http://lists.cubesat.org/mailman/listinfo/cubesat > -- Chantal Cappelletti, PhD G.A.U.S.S. coordinator ITALY : +39-0688346436 ? ? ? ? ? ? +393336200333 ?(cell) ? ? ? ? ? ? G.A.U.S.S.- Gruppo di Astrodinamica ? ? ? ? ? ? via Salaria 851, ? ? ? ? ? ? 00138 ROMA USA :?? 001-606-783-9597 (office) ? ? ? ? ?? Space Science Center ? ? ? ? ?? Morehead State University ? ? ? ? ?? 200A Martindale Dr. ? ? ? ? ?? Morehead, Kentucky 40351 ------------------------------ _______________________________________________ Sent via amsat-bb(a)amsat.org. 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 7, Issue 179 ****************************************

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