November 2006 - AMSAT-BB - mailman.amsat.org

Opinions on ICOM 1271 1.2 ghz rig for satellite use?
by Greg D. 18 Nov '06

18 Nov '06

Hi folks, Not owning a 1.2 ghz rig, and it apparently being a strong preference for Eagle, I've been on the lookout for a way to get on that band. A more-or-less local ham has an ICOM 1271 rig for sale. How would this rig be for satellite work? What would be a reasonable price? With 10 watts out, and about a 60' run to the roof (about 50' of that would probably be hardline), would I need a massive antenna to get any kind of signal into the bird? The alternative is probably to find a one of those rare 1.2 ghz modules for my Yaesu FT-737R, or some sort of transverter driven from my Yaesu FT-736R or FT-767 (50/144/430 modules installed). What do you think? Thanks, Greg KO6TH _________________________________________________________________ All-in-one security and maintenance for your PC. Get a free 90-day trial! http://clk.atdmt.com/MSN/go/msnnkwlo0050000002msn/direct/01/?href=http://cl…

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ORBIT magazines 1981 thru 1984
by Dave Guimont 18 Nov '06

18 Nov '06

TO ALL.... I have ORBIT magazines for sale plus the first two "colored cover" copies of the SATELLITE JOURNAL for sale. The orbits are all in color covers.... ORBIT runs from copy #6 mar/apr 1981 thru copy #19 nov/dec 1985...and SATELLITE JOURNAL from copy #1 jan/feb 1985 thru copy #2 mar/apr 1985...obviously every two months. As I remember it was then issued as a folded paper sheet until its familiar format now.... They weigh about 3# wrapped for shipping.... 1. I will sell/ship only as a lot. Successful bidder will determine choice of shipping and pay for it. 2. I will answer all bids as being received, but will announce on here only WHEN the bidding is successful.... 3. I WILL NOT ANSWER ANY OTHER E-MAIL REQUESTS. Telephone ok, and here is my number: 619-275-1495 4 THEY ARE USED, but all readable and in good condition..AND they have been read, it was our only source of information then, except on the satellites themselves, starting with AO7 for me 73, Dave wb6llo(a)amsat.org Disagree: I learn.... Pulling for P3E... -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.430 / Virus Database: 268.14.7/538 - Release Date: 11/18/2006

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Help with crystal filter
by William Leijenaar 18 Nov '06

18 Nov '06

Hi AMSATs, For a (small) transponder design I am checking different kinds of filters. I need something small and cheap, and I tested some of the monolitical 10M30A crystal filters. The problem is that I can not get the ripple less than 2dB, where the specs say 0.5dB. I can see the 2 poles with a kind of bath-tube in the middle. I think the problem is the matching of the 5000 ohm impedance in the specs. In my design I used small 5mm transformers, that doesn't work at all. More tests with a "pigs nose" transformers work better, only not better than 2dB ripple. Maybe someone has experience with these monolitical crystal filters (especially the wideband 10M30A) ?? I wonder how sensitive these filters are to an impedance miss-match, and how to get the optimum out of these filters ?? Specs can E.g be found here: http://www.icmfg.com/107mhzfilters.html 73 de PE1RAH William Leijenaar --- ____________________________________________________________________________________ Sponsored Link Mortgage rates near 39yr lows. $510k for $1,698/mo. Calculate new payment! www.LowerMyBills.com/lre

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Antennas
by Jim K0SBH 18 Nov '06

18 Nov '06

Hi Group, I have the following antennas for sale and they have never been outside in the weather. Used in attic only. EB-144 2M Eggbeater w/reflector Kit $125.00 EB-432 70 CM Eggbeater w/reflector kit $125.00 Arrow II 146/437-10 $40.00 If interested contact is via reply Email or Phone 314-952-6835 Thanks Friendship Through Amateur Radio Jim Wellinghoff, K0SBH Satellite-DXCC, WAS, WAC, 1 short of WAZ Former DX Editor Oscar Satellite Report, OSR

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For Sale Antennas
by Jim K0SBH 18 Nov '06

18 Nov '06

Hi Group, I have the following antennas for sale and they have never been outside in the weather. Used in attic only. EB-144 2M Eggbeater w/reflector Kit $125.00 EB-432 70 CM Eggbeater w/reflector kit $125.00 Arrow II 146/437-10 $40.00 If interested contact is via reply Email or Phone 314-952-6835 Thanks Friendship Through Amateur Radio Jim Wellinghoff, K0SBH Satellite-DXCC, WAS, WAC, 1 short of WAZ Former DX Editor Oscar Satellite Report, OSR

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Re: Practical L Band Antenna?
by Matt 18 Nov '06

18 Nov '06

For AO-40 I had 10 watts thru about 8m of LDF450 and 1m of superflex into a 25 ele loop yagi. I wasn't very happy with it, could only get in with low squint angles. So I moved to a 1.5m dish with CP patch feed that was fed with 20m RG58 (yes RG58!), this gave me 1 watt at the base of the dish. I fed this 1 watt into a 16 watt brick amp and I became one of the "Big Boys". For AO-51 I am using the 25 ele loop yagi fed with 8m of RG214 from 24cm icom HT into 16 watt amp. Works well with AO-51, there are many fades but that is the spacecraft moving around, so I am not to worried about CP. Matt -VK2DAG-

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Re^2: AO-07 healthy CW
by Mineo Wakita 18 Nov '06

18 Nov '06

Thanks for many reports on AO-07. I collected them on my HP: http://www.ne.jp/asahi/hamradio/je9pel/ao7cwtlm.htm --------------------------------------------- Name: Mineo Wakita / JE9PEL, JAMSAT member Mail: ei7m-wkt(a)asahi-net.or.jp URL : http://www.ne.jp/asahi/hamradio/je9pel/ QTH : Yokohama Japan, GL:pm95tj Date: Nov 18, 2006 ---------------------------------------------

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Re: David Ransom...SK
by Roger Kolakowski 17 Nov '06

17 Nov '06

I am very sorry to hear of his passing. His tracking program, STSPLUS, has always been my favorite to interest the kids at my wife's school in space, ISS and the satellites. In honor, I have to include his links below... http://www.dransom.com/dr94b.jpg http://www.dransom.com/ Roger WA1KAT

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David Ransom - Author of STSPlus
by David Bate 17 Nov '06

17 Nov '06

It is with great sadness to report, that David Ransom lost his battle with congestive heart failure, passed away on 5 November. While it initially appeared that Dave would recover, things began failing one-by-one until he succumbed. Dave’s family was at his side at the end. His passing on is a great sadness for the many people he has helped over the years and his friends who knew him. He will be sadly missed. -- David Bate Ontario Canada http://www.scannerdesk.com/ http://www.aus-city.com/ubbthreads/ubbthreads.php

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Practical L Band Antenna?
by Mark Brueggemann K5LXP 17 Nov '06

17 Nov '06

I am (and have been for a while now) in the throes of getting a satellite station set up. I currently have V and U circularly polarized yagis, and recently acquired a K5GNA barbecue dish and converter. What would be a practical antenna for 1.2GHz? A helix is the first thing that comes to mind, but is the ability to switch polarization important? I was told this was worthwhile for V/U, so I went through the extra trouble and expense to add that feature to those antennas. How important is polarity switching for L and S band? I am limited to what will fit on a 6' horizontal fiberglass mast of a 5400 AZ/EL rotor, so I am interested in finding out what would be a modest performance antenna for 1.2GHz for A0-51, and potentially future birds. Rig is an Icom 910. Thanks. Mark K5LXP Albuquerque, NM

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