February 2007 - Eagle (INACTIVE)

High Efficiency RF Amplifier Documents on Eaglepedia
by Tom Clark, K3IO 13 Feb '07

13 Feb '07

All: A few weeks ago I posted a couple of Univ of Colorado PhD theses in the files area on Eaglepedia that you might find of interest. The titles are "SWITCHED-MODE MICROWAVE CIRCUITS FOR HIGH-EFFICIENCY TRANSMITTERS" and "ROBUST DESIGN METHODOLOGY FOR CLASS-E AMPLIFIERS FOR MICROWAVE APPLICATIONS". I have a 3rd thesis that also looks of interest (entitled "BROAD BAND ANTENNA ARRAYS AND NOISE COUPLING FOR RADIO ASTRONOMY", but it's 54MB size causes Eaglepedia to barf on upload. Sometime, we need to figure a way to post BIG documents. Regards, Tom

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Eagle Microwave Antenna Concepts
by Tom Clark, K3IO 13 Feb '07

13 Feb '07

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doubling on TeamSpeex
by Phil Karn 13 Feb '07

13 Feb '07

Does anybody have any references on the internals of Team Speak? I'd like to figure out why doubling sounds so bad, and fix it if at all possible. It's pretty obvious from tracing the packets that everybody talks UDP to a central node (ts1.teamspeakhost.com) that repeats whatever it hears. There just aren't very many ways to do this. The central node can reflect the individual bit stream(s) exactly as received, without decoding. The listeners decode them. If more than one person talks at once, everybody sums up the PCM. (This is how Eagle's voice conferencing should work.) The other way has the central node decode the incoming packet stream(s), sum the decoded audio if there's more than one active stream, and re-encode the result into a single forward stream. This has the moderate advantage of not overrunning any slow dialup modems that might be in use. This isn't an FM repeater, so either way there needn't be any significant distortion when two people talk at once. Even with loud talkers and central summing, gain scaling would avoid clipping. The fact that the audio *is* so badly distorted whenever a double occurs, even when one talker isn't saying anything, means that something is broken somewhere. Perhaps the summing is being done incorrectly at the server. Maybe it's trying to sum mu-law PCM, which is nonlinear. The doubling distortion combined with the fairly long round trip delay makes this system a lot more fatiguing and a lot less usable than it could be. --Phil

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Good tutorial on LO phase noise
by Phil Karn 13 Feb '07

13 Feb '07

http://www.am1.us/Papers/U10236%20Phase%20Noise-%20How%20Good-%20Gilmore.pdf Gilmore is a former Qualcommer. --Phil

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Eaglepedia
by Dick Jansson-rr 13 Feb '07

13 Feb '07

Emily: How do I log into Eaglepedia as KD1K? My mail port is accepted, but Eaglepedia does not like the callsign..... Dick Jansson, KD1K (ex: WD4FAB) kd1k(a)amsat.org ---------------------------

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Call Sign
by Dick Jansson-rr 11 Feb '07

11 Feb '07

Greetings: I was greeted this morning with the news of my new callsign, now KD1K, after a lengthy delay while the FCC got its software straightened out (nothing new about that!). Dick Jansson, KD1K (ex: WD4FAB) ---------------------------

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P3D and P3E in Scientific American
by Bill Tynan 07 Feb '07

07 Feb '07

Thought you-all would be interested in this: The March 2007 issue of Scientific American contains an advertising section by the Czech Republic. On page CZ-10 of that section is a photo of P3D sitting on the launch vehicle. The accompanying text tells how Brno University of Technology is participating with "AMSAT". "Specifically, an on-board receiver with phase locked loop synthesizer has recently been developed for communication and commanding of the AMSAT Phase 3E Satellite which is to be launched in 2007. Formally a unique operations center was developed which helped with Phase 3D satellite control." 73, Bill, W3XO PS: BTW, I'm still not getting any Eagle mail, even though I have requested a change in address. I wish someone could do something.

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[Fwd: Re: 3GHz]
by Jim Sanford 06 Feb '07

06 Feb '07

Team: This is the response I got to an email I sent after seeing the latest CQ-VHF. The successors to the HSMM effort are proposing a digital band plan, and have included us. They gave us 3400 to 3410, as an initial proposal. SO, digital guys, is this enough? In the discussions I've been part of, we spoke of 10 MHz as a minimum, and we spoke of it as nominal. How much do we REALLY need? What's been published is a proposal, the beginning of a conversation. I know we're a long way from saying, "this is what it will be," but can we articulate a needed bandwidth based on what we know now? I'd like to think that we can, but will defer to you who are smarter than me on these things. You who are more familiar with the international regulatory scene, is this a good freq range, or should we ask them to move? These guys like what we're doing and want to support us. Good things are happening! Thanks & 73, Jim wb4gcs(a)amsat.org -------- Original Message -------- Subject: Re: 3GHz Date: Sat, 3 Feb 2007 19:07:47 -0500 From: Paul Toth-NA4AR <ptoth1(a)tampabay.rr.com> Reply-To: Paul Toth-NA4AR <na4ar(a)ni4ce.org> To: Jim Sanford <wb4gcs(a)amsat.org> References: <45C51EDF.1060407(a)amsat.org> Jim... I passed it on to Drew Glasbrenner-KO4MA. Drew coordinates the Florida AMSAT Net on the NI4CE Repeater System (and other repeaters that link into NI4CE via Echolink). Drew indicated to me he would pass the bandplan up the line. I haven't seen what CQ published as yet. The bandplan reserves a window between 3.400 GHz-3.410 GHz for EAGLE and other satellite operations. /*If that is not suffficient, please let me know. The proposed bandplan is really more a suggestion for broadband network operations rather than something set in concrete.*/ ARBA, Inc. (Amateur Radio Broadband Alliance) came up with this to provide some guidance to those who want to build broadband wireless networks. We recognize that existing local activity on the band will need to be accommodated. I applaud the work you and AMSAT are doing. One of the missing links in Amateur Radio disaster communications has been digital satellite capability over an extended period (more than give or ten minutes at a time). EAGLE will help fill that need. Very 73 de Paul-NA4AR ----- Original Message ----- From: "Jim Sanford" <wb4gcs(a)amsat.org> To: <na4ar(a)ni4ce.org> Sent: Saturday, February 03, 2007 6:46 PM Subject: 3GHz > Paul: > I just read your article in CQ-VHF regarding HSMM work. In one of the > figures, you mention passing on a proposed band plan to AMSAT for > coordination with Eagle. > > Question: to whom did you pass that on? I'm the Eagle project manager > and have not seen it, other than the chart in the article. > > GOod article, congratulations. > > Thanks & 73, > Jim > wb4gcs(a)amsat.org >

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Fw: Fw: 3.3 GHz ARBA Band Plan
by Andrew Glasbrenner 05 Feb '07

05 Feb '07

Here is a forward of the original message as I received it back from the eagle list, so I -know- it went to the list. There was some discussion afterwards which I have archived. 73, Drew KO4MA ----- Original Message ----- From: Andrew Glasbrenner To: eagle list Cc: Dave Anderson ; Paul Toth-NA4AR Sent: Saturday, November 04, 2006 6:21 PM Subject: [eagle] Fw: 3.3 GHz ARBA Band Plan Hi Guys, I am forwarding this email to the Eagle amsat list, which consists of just about everyone involved with our new satellite effort. Hopefully the right person will respond so we can work together on this issue. 73, Drew KO4MA Amsat-NA VP Operations LM 2332 ----- Original Message ----- From: Paul Toth-NA4AR To: ko4ma(a)amsat.org Cc: Dave Anderson Sent: Saturday, November 04, 2006 5:53 PM Subject: 3.3 GHz ARBA Band Plan Drew... A new group call ARBA, the Amateur Radio Broadband Alliance, has formed in the ashes of ARRL's HSMM Working Group. Both Dave Anderson and I are part of ARBA. One of the things we are working on is the development of a band plan for the 3.3 GHz to 3.5 GHz allocation. I know that AMSAT is planning something for Eagle that makes use of the 3.3GHz band. Would you please review the chart below and provide some input to allow this band plan to peacefully co-exut with whatever AMSAT is planning? Please feel free to share with others in the AMSAT leadership. 73 de Paul-NA4AR ARBA BAND PLAN 3.3 GHZ - 3.5 GHz 3300-3310 3310-3330 3330-3340 3340-3350 3350-3370 3370-3380 3380-3390 3390-3410 3410-3420 3420-3430 3430-3450 3450-3460 3460-3470 3470-3490 3490-3500 -------------------------------------------------------------------------------- _______________________________________________ Via the Eagle mailing list courtesy of AMSAT-NA Eagle(a)amsat.org http://amsat.org/mailman/listinfo/eagle

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