August 2009 - AMSAT-BB - mailman.amsat.org

Re: Antenna project with 2 ELK antennas
by Jean-François Ménard 08 Aug '09

08 Aug '09

Le 8 août 2009 11:54, i8cvs<domenico.i8cvs(a)tin.it> a écrit : > Hi Jean, VA2SS > > Since the ELK antenna is a log-periodic antenna covering a wide > band from 2 meters and 70 cm it is difficult to connect 2 ELK in > phase and gain 3 dB in 2 meters and 70 cm as well. > > Also it is difficult to connect 2 ELK with a phase offset of 90° > to get circular polarization in 2 meters and 70 cm > > I would prefere to put one ELK horizontal and the other one > vertical feeding each antenna with an individual coax line. > > Using a coax relay in the shack you can immediately switch > from the Horizontal to the Vertical polarization. > > About the distance between the antennas over the plastic boom > the distance is a function of the antenna gain and higher is the gain > (in order do not overlap the aperture area of each antenna) larger > must be the distance between booms > > Since the gain of the ELK in the lover 2 meters band is 6.6 dBd > over the dipole or 6.6 +2.14 = 8.7 dBi over the isotropic then the > aperture area wich is a circle perpendicular to the antenna boom > can be computed using the following formula: > > / 2 > G x /\ > Aperture area= ---------- > 4 x Pi > > Since G= 8.7 dBi = 7.41 in power ratio > > 2 > 7.41 x 2 > Aperture area= -------------- = 2.36 square meters > 4 x 3.14 > > A circle with a geometrical area of 2.36 square meters > has a radius of > > \ /-------------------- > radius = \ / 2.36 / 3.14 = 0.86 meters > \/ > > Hence the distance between the booms is 0.86 x2 = 1.72 meters > > In this condition both aperture areas are tangents but it is better > to overlap the areas a 10 % to prevent the generation of side lobes > so that a distance of 1.55 meters between the antenna booms > is recommended. > > I hope this helps > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "Jean-François Ménard" <jf.va2ss(a)gmail.com> > To: "i8cvs" <domenico.i8cvs(a)tin.it> > Sent: Saturday, August 08, 2009 4:00 PM > Subject: Re: [amsat-bb] Antenna project with 2 ELK antennas > > > Hi, > > I do not know much about antenna... But I tought that could be better > for satellite this way... I did not do any search at this time about > this project... it is only an idea that I had. > > If you have any suggestion for such project using 2 Elk antenna.... > please let me know. > > I don't want to spend much money at this moment... and I have only > these 2 antenna. > Wow !! Thanks !! This is the kind of answer that I really like. I will try this with the recommendation you gave me. I'm not familiar with all those formulas regarding antenna, so a little help time to time is really helpful.... I like to learn, so you won't repeat the same thing twice. Thank again. Best 73 J-F VA2SS > 73 > > > 2009/8/8 i8cvs <domenico.i8cvs(a)tin.it>: >> ----- Original Message ----- >> From: "Jean-François Ménard" <jf.va2ss(a)gmail.com> >> To: "AMSAT Mailing list" <amsat-bb(a)amsat.org> >> Sent: Thursday, August 06, 2009 10:44 PM >> Subject: [amsat-bb] Antenna project with 2 ELK antennas >> >> Hi, >> >> I have 2 ELK antennas here, and I would like to do an experiment with >> these two antennas. I would like to stack side by side, one vertical, >> and one horizontal. >> >> 73 >> >> Jean-François Ménard >> VA2SS >> >> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >> AMSAT www.amsat.org / Member #37102 >> ARRL www.arrl.org >> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >> >> Hi Jean, VA2SS >> >> Staking 2 ELK antennas side by side,one vertical,and one horizontal >> what type of polarization you plan to get ? >> >> 73" de >> >> i8CVS Domenico >> >> >> >> > > > > -- > Jean-François Ménard > VA2SS > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > AMSAT www.amsat.org / Member #37102 > ARRL www.arrl.org > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > > > > > > > > -- Jean-François Ménard VA2SS =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= AMSAT www.amsat.org / Member #37102 ARRL www.arrl.org =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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Packet software
by Randy 08 Aug '09

08 Aug '09

What software is everyone using and / or the most popular? I would like to setup to send packets to ISS and would like To do that via the computer only , no hardware TNC. Randy - N2CUA

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Antenna project with 2 ELK antennas
by Jean-François Ménard 08 Aug '09

08 Aug '09

Hi, I have 2 ELK antennas here, and I would like to do an experiment with these two antennas. I would like to stack side by side, one vertical, and one horizontal. My question, what would be the distance between both antenna !?!?! I will be using PVC tube to avoid interaction. The phasing line... will it be hard to figure how to do it !?!?!? Any rough guess to start with. I have an antenna analyzer here... probably will be handy for that project. I just want to experiment how good it could perform. Any help would be appreciated. 73 -- Jean-François Ménard VA2SS =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= AMSAT www.amsat.org / Member #37102 ARRL www.arrl.org =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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Avoiding statics on helix antennas
by Lars Petersen 08 Aug '09

08 Aug '09

Hello AMSAT list, I have a problem caused by static electricity building up on my two helix antennas (23 cm and 13 cm). Two converters have already been zapped, so I have to do something about it. What measure would you recommend to avaoid statics building up on helix antennas? Does anyone have experience using the shorted quarter-wave-stub mentioned in "The ARRL Handbook 2008" pages 23.20-21? Vy 73, Lars Petersen, OZ1BXM, AMSAT-Member 36222, oz1bxm(a)pobox.com www.oz1bxm.dk

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pollux-1 and castor report
by Rob Hardenberg PE1ITR 08 Aug '09

08 Aug '09

Received today from pullux-1 and 1 packet from castor (kd4hbo-1) on 145.825: !S 09:24:24 !POLLUX-1>CQ,TELEM/1: !S 09:24:25 !MEMS 748836 2.58 2.57 2.45 22.03 21.225 19.06 -1.08 0.07 1.660 -8.28 3.31 3.10 24.21 25.22 24.76 2.60 20 19 42 !S 09:24:51 !POLLUX-1>CQ,TELEM/1: !S 09:24:51 !SYST 748869 0 0 33 0 013a 15e8 fffe 1500 0022 1500 001c 05f0 0013 05d0 ffff ffff 0154 08c4 0fbe 003c !S 09:27:03 !POLLUX-1>CQ,TELEM/1: !S 09:27:03 !SYST 749001 0 0 33 0 0003 1690 0006 15b8 001c 15b0 0033 06b0 0026 06d0 ffff ffff 0154 08c6 0fbc 003c !S 09:27:42 !POLLUX-1>CQ,TELEM/1: !S 09:27:42 !MEMS 749034 2.57 2.57 2.45 21.771 21.09 18.990 -1.06 0.226 1.773 -8.58 4.53 -1.97 24.08 25.13 24.52 2.60 20 26 39 !S 09:28:09 !POLLUX-1>CQ,TELEM/1: !S 09:28:09 !SYST 749067 0 0 33 0 000d 16f8 0000 15f8 0179 1600 0018 0750 0046 0728 ffff ffff 0156 08c4 0fba 0038 !S 09:31:00 !POLLUX-1>CQ,TELEM/1: !S 09:31:00 !MEMS 749232 2.58 2.57 2.45 21.556 21.09 18.990 -1.01 0.444 1.443 -8.43 2.05 -6.98 24.10 25.11 24.46 2.60 35 34 4 !S 09:32:06 !POLLUX-1>CQ,TELEM/1: !S 09:32:07 !MEMS 749298 2.57 2.57 2.45 21.771 21.09 18.990 -1.113 -0.119 0.559 -9.62 -2.24 8.12 24.01 25.11 24.45 2.60 3 41 38 !S 09:32:33 !POLLUX-1>CQ,TELEM/1: !S 09:32:33 !SYST 749331 0 0 33 0 0011 1858 0154 1758 0157 1788 000e 0960 001b 0910 ffff ffff 0156 08c6 0fba 003c !S 09:33:13 !KD4HBO-1>CQ,TELEM/1: !S 09:33:14 !SYS 744510 65535 0 30 0 feac 0b58 ffec 09c0 fea9 0f20 ffc1 0d48 fffa 10d8 ffd5 0f98 13.8 5.0 9.9 .00 0.13 0.55 12.21 9.91 9.91 44 19 44 73 Rob PE1ITR http://www.pe1itr.com

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POLLUX TLM - via remote station
by Fabiano Moser 08 Aug '09

08 Aug '09

Today I decoded POLLUX telemetry, by remote station control, from my job. Works FINE! Fm POLLUX-1 To CQ Via TELEM <UI pid=F0 Len=101 >[10:22:40] SYST 748737 0 0 33 0 fffe 1530 0002 1460 0015 1448 001a 04d8 000d 04e0 ffff ffff 0156 08c4 0fbe 0038 -- 73 Fabiano Moser CR7/PY5RX ARISS-PORTUGAL (Amateur Radio on the International Space Station) Representative at Teleconference and Portugal Telebridge Coordinator. AMRAD/AMSAT-CT http://www.amrad.pt/ariss.php "There is no great talent without great will. (Honoré de Balzac)"

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PCSAT report 2009-08-08
by Rob Hardenberg PE1ITR 08 Aug '09

08 Aug '09

Hello, Received some readable packets from pcsat: !S 08:44:23 !W3ADO-1>BEACON,SGATE/1: !S 08:44:23 !T#010,063,065,061,072,214,11111111,0001,1 !S 08:44:24 !PCSAT-11>BEACON,SGATE/1: !S 08:44:24 !T#003,064,059,131,232,215,11111110,0010,1 !S 08:46:17 !W3ADO-1>APRS1/1: !S 08:46:17 !Default LT1 73 Rob PE1ITR http://www.pe1itr.com

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New satellite rigs?
by John Geiger 08 Aug '09

08 Aug '09

Is anyone hearing any rumors of new satellite rigs on the horizon (pun intended)? The TS2000 and Icom 910H are hitting 9 years on the market, and Yaesu isn't currently marketing a satellite rig. 73s Jon AA5JG

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[keps] Satellites Added to AMSAT KEPs
by Randy 07 Aug '09

07 Aug '09

-----Original Message----- From: Randy [mailto:[email protected]] Sent: Friday, August 07, 2009 7:26 PM To: 'amsat-bb(a)amsat.org' Subject: FW: [keps] Satellites Added to AMSAT KEPs I also asked them to add them to their satellite pass prediction page.. Randy - N2CUA -----Original Message----- From: keps-bounces(a)amsat.org [mailto:[email protected]] On Behalf Of Ray Hoad Sent: Thursday, August 06, 2009 11:34 PM To: AMSAT KEP Subject: [keps] Satellites Added to AMSAT KEPs Pollux Catalog Number 35693 and CASTOR Catalog Number 35694 have been added to the AMSAT KEPs this week. I am not sure of the Catalog Number for Dragonsat (BEVO-1 and AGGIESAT-2) because AF Space Command had not yet listed in recent launches. Does someone know the Dragonsat Catalog Number?

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FW: [keps] Satellites Added to AMSAT KEPs
by Randy 07 Aug '09

07 Aug '09

I also asked them to add them to their satellite pass prediction page.. Randy - N2CUA -----Original Message----- From: keps-bounces(a)amsat.org [mailto:[email protected]] On Behalf Of Ray Hoad Sent: Thursday, August 06, 2009 11:34 PM To: AMSAT KEP Subject: [keps] Satellites Added to AMSAT KEPs Pollux Catalog Number 35693 and CASTOR Catalog Number 35694 have been added to the AMSAT KEPs this week. I am not sure of the Catalog Number for Dragonsat (BEVO-1 and AGGIESAT-2) because AF Space Command had not yet listed in recent launches. Does someone know the Dragonsat Catalog Number?

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