AMSAT-BB February 2007

199 participants
284 discussions

Call for Papers--2007 ARRL/TAPR Digital Communications Conference

by Ford, Steve, WB8IMY

Technical papers are solicited for presentation at the 26th Annual ARRL and TAPR Digital Communications Conference to be held September 28-30, 2007 in Hartford, Connecticut. These papers will also be published in the Conference Proceedings (you do NOT need to attend the conference to have your paper included in the Proceedings). The submission deadline is July 31, 2007. Please send papers to: Maty Weinberg ARRL 225 Main St Newington, CT 06111 or you can make your submission via e-mail to: maty(a)arrl.org Papers will be published exactly as submitted and authors will retain all rights. 73 . . . Steve, WB8IMY ARRL

9 years, 11 months

TV antenna rotators

by Tim Tapio

Do any of them offer full 360 degree rotation. I picked up a channel master, it only travels 180.. 73 de Tim, K4SHF

15 years, 2 months

Fw: WCVB-TV video of Chronicle from 2/23/07

by Roger Kolakowski

A little off topic but a nice presentation of the beginnings of ham and commercial radio in New England... ----- Original Message ----- From: "Rick Kelly" <rickkelly(a)gmail.com> To: "Boston Radio Interest" <boston-radio-interest(a)rolinin.bostonradio.org> Sent: Tuesday, February 27, 2007 10:37 PM Subject: WCVB-TV video of Chronicle from 2/23/07 > I'm not sure how this happened, but the WCVB-TV video of Chronicle > from 2/23/07 has appeared on Google Video: > > http://video.google.com/videoplay?docid=-4569021939106575335 > > Happy viewing... it certainly is GREAT! > -- > Rick Kelly > www.northeastairchecks.com >

15 years, 3 months

Re: DC-feeding through Coaxial on PA?

by Steven Samuel Bosshard (NU5D)

I would be concerned about the resistance and current carrying capability of the cable and connectors. A 100 Watt PA may draw 20 amperes at 12 VDC. sb

15 years, 3 months

file voice synthesizer of RAFT

by Tanan Rangseeprom

Please download sound at this URL http://hs2waq.no-ip.com/images/RAFT280207_1040 Loc.mp3 Hello ALL I used TNC2 connect to RAFT satellite for open mode voice synthesizer. I used to follow format command :TALK (space bar 5 step): Word after connect to RAFT and I use successful to run RAFT speak sound. I hope contact other HAM via RAFT and ANDE Regards, Tanan Rangseeprom ____________________________________________________________________________________ Expecting? Get great news right away with email Auto-Check. Try the Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html

15 years, 3 months

OLd things dies

by Luc Leblanc

ANS excerpt As of February 23, 2007, Our Old Friend "morse code" has now slipped into history as a requirement for a U.S. Amateur License. The tones and burps in the lower portions of the HF bands will become more and more silent as those that remember CW start to become silent keys themselves. "Silent Key" will go by the wayside as well. As a longtime Extra, I can honestly say that getting up to speed was an excitement all its own. Just 5 WPM for my Novice was a thrill learning those mysterious tones. I for one, can certainly see it both as a defunct digital mode and a unique mode to operate pulling out a QSO from those melodius tones. Ditty dum dum ditty will have a narrower meaning from this time on. That's the cycle of life could be ARRL will also adjust in his field day rules...1 point per QSO phone and CW? How they can live in the past? it is not the Antique Radio Relay League! "-" "It is not the class of license the amateur holds, but the class of the amateur that holds the license." Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE

15 years, 4 months

Re: Yes, DStar can work on LEO

by Bob Witte K0NR

Someone wrote: >> Please do not use FM on any of the transponder satellites, whether D-Star or >> plain FM. FM of any kind is expressly unwelcome on AO-7 especially. >> >> If you would like to set up a test of D-Star via AO-51, please organize the >> effort and send a request to schedule it to ao51-modes(a)amsat.org or to >> myself directly and we will accommodate the test on a FM satellite, where FM >> belongs. I think it'd be an interesting experiment. >> > > Umm, I thought D-Star was a digital mode, not riding on top of > FM. Is it transmitted as AFSK or is it modulated directly onto the > carrier? If it's the latter, then it wouldn't work on an FM satellite. > > 73 de VK3JED > http://vkradio.com > > From ICOM America web site: D-STAR uses the up-to-date modulation method of 0.5GMSK--Gaussian Minimum Shift Keying. 73, Bob K0NR

15 years, 4 months

RAFT: VOICE recorded in Asia !

by PA3GUO

ASIA joined the competition ! Today I received an excellent audio recording from Masa, JN1GKZ in Tokyo, Japan, working RAFT in VOICE mode: http://home.vianetworks.nl/users/hamoen/pa3guo/voice.html Masa: I got spoken by RAFT at 1002z 27th Feb. The voice was very clear. I worked the voice with 10W. I forgot to turn on power amplifier. hihi. Europe & Asia are in, which continent is next ? Henk, PA3GUO

15 years, 4 months

Falconsat3 orbit ?

by OZ1MY

Hi all, May be it has been said before - but do anyone have information about the planned orbit of Falconsat 3 ? I have looked around but did not find it so far. Inclination and height is interesting. No flames please :-) 73 OZ1MY Ib

15 years, 4 months

Thermocouple power

by G0MRF＠aol.com

Last week there was an interesting debate about raising the altitude of a satellite by using magnertic fields. Carrying on the wacky ideas theme, I've been looking at producing power by using thermocouples and not solar cells. Question: Does anyone know the 'current' or the impedance of the voltage source represented by a thermocouple? A thermocouple generates an emf (voltage) proportional to the difference in temperature between its two junctions. Given that we know a white object in space gets very cold, while Aluminium gets very hot it's interesting looking at the possibility of thermocouple power....Even if it's just to understand its limitations A thermocouple can be made very small so it should be possible to manufacture an array of them in a reasonable space. Example: A junction of two wires, one made from constantan and one from Chromel will generate a voltage of 58 microvolts for every degree difference between the junctions. That means for a 100 degree C difference you generate 5.8mV. For 350 junctions in a chain you generate 2.03 V and for 6 chains (if you wanted to risk all those junctions in series) you could have 12.18V But.........how much power can you draw from it ?? 73 David

15 years, 4 months

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AMSAT-BB February 2007