- AMSAT-BB - mailman.amsat.org

Antenna Recommendation
by Steven Samuel Bosshard (NU5D) 11 Sep '06

11 Sep '06

Hello to the list, At present I hve a G-5500 AZEL Rotor, with the azimuth rotor on a rotor plate, and the elevation rotor about 5 ft above the flat top tower. An M2 fiberglass cross boom goes out 5 ft either side of the elevation rotor. There is a M2 7 ELE cp antenna on one side, and both a 432, 15 ELE CP antenna and a 35 ele 1296 antenna on the other side. Several questions. 1 - everything VHF and UHF are RH CP. 1296 is fixed horizontal. How much would I benefit adding polarity reversing switches? and is there any benefit trying cp on 1296? 2 - I am thinking about adding 2.4G to this mess. What antenna would this group recommend for out in the country - near Gatesville Texas - pop 15,000 (1/2 of whom are incarcerated). Yagi, parabola, etc - weight would be a factor with the elevation rotor, and fiberglass boom. Downconverter or transverter tower mounted, and IF back to the shack. 3 - Are plans for 2.4 down only or are there also plans for 2.4 up? ie, downconverter or transverter? I know these questions are very elementary, but I am new to AMSAT and learning. Thanks for your patience, Steve NU5D Ham Radio Spoken Here...NU5D EM11

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S-band on Eagle
by John Mock KD6PAG 11 Sep '06

11 Sep '06

I'm too busy with other things to read AMSAT-BB or digest Eaglepedia (or whatever it's called). Speaking only as an satellite QRPer, i do have a naive question... Various amateur satellites, such as AO-7, AO-13, FO-29, AO-40, and AO-51, have been programmed to operate in a variety of different modes. Generally speaking a given frequency is usually an uplink or a downlink. On Eagle, i believe we are contrained by size considerations in terms of antenna placement, so we can't put everything we like on that bird. Assuming S band is not on all of the time, might it be feasible for it to be switchable between being an uplink or a downlink? I see this as allowing newcomers to use existing and/or inexpensive S-band downconverters some of the time, and others to use the wider bandwidth of S-band uplinks for digital experiments at other times. This might also be a way of occupying our allocated S-band spectra enough of the time to make an impression on other users while still providing an easy path for people to get beyond mode J-FM. And perhaps allow the kinds of experiments that i really had hoped that would have happened with RUDAK in parallel with AO-40 voice operations. -- KD6PAG (Networking Old-Timer, Satellite QRPer) P.S. I was able to work AO-40 QRP via a pair of homebrew quagis. I'm looking forward to doing something similar on P3E and Eagle.

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Re: DIY 70cm preamp ideas?
by Kyle Yoksh 11 Sep '06

11 Sep '06

--- Original Message --- Hi Kyle How about this one: (http://www.g0mrf.freeserve.co.uk/432LNA.htm) 73 David ------------------------ Hi David, Thanks for this link. I was looking this over and it sounds quite impressive, but I did not find a parts listing. Seems a kit can be purchased, but must then be shipped overseas, etc. Do you happen to know where I can find a parts listing? I likely have most of the necessary parts in my 'junk box'. 73, Kyle K0KN

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Re: DIY 70cm preamp ideas?
by G0MRF＠aol.com 11 Sep '06

11 Sep '06

Hi Kyle How about this one: _http://www.g0mrf.freeserve.co.uk/432LNA.htm_ (http://www.g0mrf.freeserve.co.uk/432LNA.htm) 73 David In a message dated 11/09/2006 18:08:13 GMT Standard Time, yokshs(a)sbcglobal.net writes: Hi, I am interested in building a couple of preamps for 70cm. I've Googled a little bit, but several designs require finding a specific version of the ARRL Handbook, etc. Does anyone have a complete plan available including parts list, etc? Thanks, Kyle Yoksh KØKN Olathe, Kansas Amsat# 35249

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DIY 70cm preamp ideas?
by Kyle Yoksh 11 Sep '06

11 Sep '06

Hi, I am interested in building a couple of preamps for 70cm. I've Googled a little bit, but several designs require finding a specific version of the ARRL Handbook, etc. Does anyone have a complete plan available including parts list, etc? Thanks, Kyle Yoksh KØKN Olathe, Kansas Amsat# 35249

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Latest info on P3E
by i8cvs 11 Sep '06

11 Sep '06

Hi, All Tanks to Reinhard DJ1KM r.richter(a)dj1km.de who sent me a letter dated April 14 2006 you will find the latest info on P3E at: http://www.amsat-dl.org/pic/gallery2/main.php?g2_view=core.DownloadItem&g2_i temId=6497 The address is very long so that is truncated. Be sure to copy both lines It is a 5.6 MB large PDF document (download) in English language. Best 73" de i8CVS Domenico

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Re: S-Band Not 2.4 but 2.3
by Matt 11 Sep '06

11 Sep '06

VK is 2300~2302 and 2400~2450 Lost most of 2.3 GHz for wireless cable paytv broadcast, which by the way failed and is now only a couple of narrowcasts in major cities which are failing too! JA is 2400~2450 only ZL is 2396~2450 HL is 2400~2450 I see a trend here for region 3! >--- Emily Clarke <emily(a)clarke-design.com> wrote: > > Currently there is a 5MHz > > amateur allocation at 2300-2305 in all three regions and a 10MHz > > allocation at 2390 - 2400. I believe the 2390-2400 is primary as it > > appears in all caps and 2300-2305 may also be primary. > >Neither the United Kingdom or Germany have an Amateur allocation at 2300-2310 >MHz. > >The UK's allocation is 2310 - 2450 and Germany's 2320-2450, hence the adoption >of 2320 for weak signal (CW/SSB) terrestrial working in Europe. > >So at present I think only 2390-2400 is common between US/Europe. > >73 Trevor M5AKA

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Re: 10mtr and Galileo
by Miroslav Kasal 11 Sep '06

11 Sep '06

Hi OMs, Yes, the Galileo spectrum null for both E6 orthogonal signals goes out on 1263.4 MHz. For that reason the P3E L-band receiver local oscillator is synthesized and receiver is possible to retune from 1268.800 to 1263.300 MHz (center of the analog passband) by command from the Earth. On 1268.52 MHz we expected one of the power spectral density peaks of Galileo sigs. I already offered participation on Eagle project in the field of L-band receiver. Mirek OK2AQK P3E L-band Rx designer >> Hi John, >> >> Consider this....... >> >> >> 4) I understand that the P3E folks have already worked out a solution by locating their L-Band operations in what will be a Galileo spectrum null. If that is the case, then the P3E folks are really using some good "science" to develop their satellite L-Band operations. Good for them!! Hey - I'm not in the thick of it - but it seems there are some serious gaps in communication between AMSAT-DL and AMSAT-NA even though we read about glimpses of real technical exchange. I hope we're not falling for the NIH (Not-Invented-Here) syndrome. >> >> Regards...Bill - N6GHz >> >> >> -----Original Message----- >> From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]]On >> Behalf Of John B. Stephensen >> Sent: Sunday, September 10, 2006 7:47 PM >> To: jules(a)g0nzo.co.uk; amsat-bb(a)amsat.org >> Subject: [amsat-bb] Re: 10mtr and Galileo >> >> >> What bothered people is the fact that we need high power L-band uplinks and the statement in the report that "there is the potential for most amateur 23 cm transmissions to interfere with Galileo unless the Galileo receivers are designed and built to withstand it". >> >> 73, >> >> John >> KD6OZH >>

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S-band continued.
by john hackett 11 Sep '06

11 Sep '06

Aw C'mon guys, You don't really expect the b.o.d. to pay any attention to the opinions of those whom actually "operate" on amateur satellites - not to speak of the paying public with their "donations". Be smart, tell 'em what you *don't* want - then maybe you'll get what you *do* want. (tongue in cheek). Remember ... they know better than than you! what you want - as I've oft times been told - (by b.o.d. members) (... and yes, I'm fully aware of the following "sound" reasons for some of the decisions). 1) We have to adhere to the "constructors and planners" wishes otherwise the org: will die. 2) This is Amsat-NA, we can't oblige 3rd world country wishes - (even if we DO accept their donations). 3) Cutting edge technology - (read: fewer and fewer participants/the affluent only). 4) Launch criteria has changed - (money, money, money). I just wonder if the simple mode-A that actually worked v high tech that doesn't - (for whatever reason) - has sunk in yet ... apparently not. In my opinion, RS-10 and FO-20 were the most popular and widely used amateur radio satellites (worldwide) - neither of which, incidentally, had anything to do with Amsat. ... and before you turn on the flame throwers, yes, I AM doing my bit for the amateur radio satellite fraternity ... and I AM entitled to an opinion - (though I am NOT asking you to agree with it) - it does appear however that there is a continuing conflict of interests between the "planners" and the "users". 73 John. <la2qaa(a)amsat.org>

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AO-51 Mode L/S
by Francesco Grappi 11 Sep '06

11 Sep '06

Hello All, This morning at 07.12 UTC, I had nice qso with OE6AG on Ao-51 L/S mode Strong signal into 90 cm. dish with patch feed and keps downconverter only a little bit qsb, but signal was very good. Excellent mode L/S thank you Willy for qso Thank you the AO-51 Commander Team 73" Francesco IW4DVZ

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