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

TDMA Question
by Dave Marthouse 28 Aug '12

28 Aug '12

I have been doing some reading about tdma digital voice applications such as MotoTrbo etc. I am curious if tdma voice could be used on satellites successfully Do to the time delay particularly using a heo or geo bird. Can someone more knowledgeable than I help in answering this question? Dave Marthouse N2AAM dmarthouse(a)gmail.com

1 0

More FCD
by Tom Lubbers K8TL 28 Aug '12

28 Aug '12

My FCD receives as well as my IC-910. At present I am using it mainly as a spectrum analyzer. On SO-52 you can see the whole band pass plus the beacon. It is interesting to note the beacon level versus most of the signals in the pass band. Also I can visually copy the CW from the beacon and other stations by watching the water fall. I did make a few contacts from the patio using the FCD, TH-F8 and arrow. One of these days I'll figure out how to make these posts from the BB page. Tom K8TL

1 0

Re: AMSAT-BB Digest, Vol 7, Issue 272
by Matty Cunningham 28 Aug '12

28 Aug '12

Hi Tom, Simon Brown's (creator of Ham Radio Deluxe) excellent SDR console should work for you:- http://www.sdr-radio.com/Software/tabid/174/language/en-US/Default.aspx I have used this with TX/RX capabilities with a home built HF SDR receiver and an Icom 746, (eg SDR console 'mutes' when the external radio is set to TX) - you can also track the frequency of the external radio and change SDR rx freq by using the VFO dial on the radio, or from using the SDR console (clicking with mouse / using scroll wheel etc). The FunCube dongle works very well with the SDR console, it also has built in satellite support, so you can store downlink frequencies for each satellite, and it will also control rotators and calculate doppler shift (does a clever thing with the doppler shift by moving the AF from the IQ stream, rather than changing the LO on the dongle (each time the LO changes there is a gap before it locks again). You would have to build some sort of sequencer for taking the FCD out of the loop when going into TX, but these are widely available. I have a Kenwood TS-2000 that I use to play with the birds, I haven't yet tried this in conjuction with the SDR console, I imagine it would would (in satellite mode) so you can have U/V or V/U capabilities - this is something I should have a play with in the near future. Best regards Matty MD0MAN > > > ------------------------------ > > Message: 7 > Date: Mon, 27 Aug 2012 13:44:32 -0500 > From: Thomas Doyle <tomdoyle1948(a)gmail.com> > To: AMSAT-BB(a)amsat.org > Subject: [amsat-bb] FUNcube + SatPC32 + SDR-Radio > Message-ID: > <CAHnRQRJTqfD8AZ6=swwNh2+m0zM6SaSVkTusqRsf12wE+p+kTA(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > The FUNcube and SDR-Radio work great together. Transmit control for > satellite use in SDR-Radio is very limited (non-existent from what I > have been able to find). > I would like the FUNcube / SDR-Radio combination to act like a simple > receiver under cat control from SatPC32 or similar program. I would > like to talk with anyone who has actual experience with this. > > > tnx & 73 W9KE > > > ------------------------------ > > _______________________________________________ > 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 272 > ****************************************

1 0

Proposal for 460-470 MHz CubeSat Band
by Trevor . 28 Aug '12

28 Aug '12

At the recent Summer CubeSat Workshop there was a presentation about the draft of US WP 7B which is proposing a band at 460-470 MHz for the use of CubeSats. The Powerpoint slides can be seen at http://cubesat.org/images/stories/Summer_Workshop_2012/Day_1/1115_Charles_S… The slides from the other presentations can be seen at http://cubesat.org/index.php/workshops/upcoming-workshops/124-2012summerwor… 73 Trevor M5AKA

7 6

Funcube Dongle Pro V1.1 for sale
by Stefan Wagener 27 Aug '12

27 Aug '12

If interested, drop me a note with a reasonable offer. Unit is serial# 820 and works great. Just don't use it. Stefan, VE4NSA

1 0

Fwd: [CubeSat] NASA RFI for CubeSat Launch Requirements
by Samudra Haque 27 Aug '12

27 Aug '12

Hi, I'm forwarding this note for encouraging input and generating wider interest. Samudra N3RDX George Washington University samudra(a)gwu.edu ---------- Forwarded message ---------- From: Jeremy Straub <jastraub(a)gmail.com> Date: Sun, Aug 26, 2012 at 12:00 PM Subject: [CubeSat] NASA RFI for CubeSat Launch Requirements To: cubesat(a)cubesat.org Cc: larry.p.cooper(a)nasa.gov Hi All, NASA is currently soliciting input regarding the launch services needs of the CubeSat/small satellite community. This was discussed briefly at a presentation at the end of the Small Sat Conference. As I had not seen anything about this go out to this mailing list, I wanted to make sure that everyone that might be interested had an opportunity to respond. Given the stated topic of the presentation and the fact that it occurred as the conference was wrapping up (after lunch on the last day), many of those that might have otherwise been interested were not in attendance. The RFI (which is located at the URL below), Dr. Larry Cooper (Program Executive for Centennial Challenges) mentioned, will be utilized to shape future competitions aimed at creating lower-cost, higher-frequency CubeSat launch opportunities (including, possibly, propulsion-system-friendly ones). Given this, it seems that maximizing community input (to ensure a proper balance with launch service provider/vendor needs/etc.) is highly desirable. http://prod.nais.nasa.gov/cgi-bin/eps/sol.cgi?acqid=153002#Other%2001 Thanks, Jeremy Straub Ph.D. Student University of North Dakota _______________________________________________ CubeSat mailing list CubeSat(a)cubesat.org http://lists.cubesat.org/mailman/listinfo/cubesat

1 0

TAPR Announces DCC (Digital Communication Conference) Technical & Introductory Sessions Schedule, Banquet Speaker/Topic and Sunday Seminar Speaker/Topic
by Mark Thompson 27 Aug '12

27 Aug '12

TAPR Announces DCC (Digital Communication Conference) Technical & Introductory Sessions Schedule, Banquet Speaker/Topic and Sunday Seminar Speaker/Topic ARRL/TAPR DCC, Atlanta, September 21 - 23 www.tapr.org/dcc Sheraton Gateway Hotel Atlanta Airport 1900 Sullivan Road Atlanta, GA 30337 Technical / Introductory Sessions Schedule http://www.tapr.org/pdf/DCC_2012_Schedule.pdf Technical Sessions Friday - Saturday Introductory Sessions Saturday Saturday Night Banquet Speaker & Topic http://www.tapr.org/dcc#banquet DCC Saturday Night Banquet Speaker will be Bdale Garbee, KB0G talking about the "Sharing the Joy of Making" Sunday Morning Seminar Speaker & Topic http://www.tapr.org/dcc#seminar DCC Sunday Morning Seminar will be a hands-on tutorial using Gnuradio to design and implement software defined radios on your laptop presented by Tom Rondeau, KB3UKZ, the leader of the Gnuradio project.

1 0

Video of OSSI CubeSat Presentation
by Trevor . 26 Aug '12

26 Aug '12

For anyone that didn't see the live webcast there is a video of the OSSI-1 keynote presentation given in Malmö, Sweden at http://www.uk.amsat.org/?p=9921 73 Trevor M5AKA

1 0

RIP Neil
by Robert McGwier 26 Aug '12

26 Aug '12

http://www.nasa.gov/home/hqnews/2012/aug/HQ_12_600_armstrong_family.html -- Bob McGwier Technical Director, Allied Communication, LLC Facebook: N4HYBob ARS: N4HY

1 0

Astronaut Neil Armstrong, first man to walk on moon, dies at age 82
by Alan P. Biddle 25 Aug '12

25 Aug '12

One of the real pioneers has passed: http://preview.tinyurl.com/9e722fo Alan ----------------------------------- Climate is what you expect, weather is what you get. Robert A. Heinlein

2 1