[amsat-bb] Re: Re: HO-68 Schedule - 06-13 June 2010
I was able to contact LU2DPW (Buenos Aires Province) from my QTH in Santiago.The transponder (and packet beacon) was active at least at 03:10UTC during that pass.Andrés B CE3SNA>07 June 2010 > >03:05...Turn On--FM >South America,NA,North Asia >03:50...Turn Off >I just tried FM and SSB, heard no one and did not hear myself. Did anyone >else successfully work HO-68 on this pass? >Mark Lunday >WD4ELG ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: HO-68 Schedule - 06-13 June 2010
07 June 2010 03:05...Turn On--FM South America,NA,North Asia 03:50...Turn Off I just tried FM and SSB, heard no one and did not hear myself. Did anyone else successfully work HO-68 on this pass? Mark Lunday WD4ELG ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Yaesu G-5400B For Sale
Sorry, folks. I should have stated, those prices do not include shipping. My apologies for any inconvenience. 73, Joel, W4JBB On Sun, Jun 6, 2010 at 6:51 PM, Joel Black wrote: > I'll offer it here first. I have a Yaesu G-5400B rotor and controller for > sale. It took some lightning damage to the controller but it has been > repaired and works well. It is several years old and I am not the original > owner. I will also throw in a Fox-Delta ST1. The ST1 is brand new - I > still have the raw parts for assembling the cable that interfaces to the > rotor controller. The rotor, controller, and ST1 for $300 firm. > > I also have the following antennas that I will sell locally (Tuscaloosa, > AL) or will travel up to 50 miles: > > KLM 22-element 2m CP antenna - $100 firm > Homebrew 44-element 70cm CP antenna - $100 firm > > I also have a couple of preamps - both Icom, one for 2m, one for 70cm that > I could be talked into selling and an eight foot FG crossboom. > > All of this equipment is still mounted on a short tower, but can be removed > easily. I can provide pictures if needed. > > Thanks for the BW. > > 73, > Joel, W4JBB > > -- > Joel Black > jbblack(at)charter.net > -- Joel Black jbblack(at)charter.net ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Yaesu G-5400B For Sale
I'll offer it here first. I have a Yaesu G-5400B rotor and controller for sale. It took some lightning damage to the controller but it has been repaired and works well. It is several years old and I am not the original owner. I will also throw in a Fox-Delta ST1. The ST1 is brand new - I still have the raw parts for assembling the cable that interfaces to the rotor controller. The rotor, controller, and ST1 for $300 firm. I also have the following antennas that I will sell locally (Tuscaloosa, AL) or will travel up to 50 miles: KLM 22-element 2m CP antenna - $100 firm Homebrew 44-element 70cm CP antenna - $100 firm I also have a couple of preamps - both Icom, one for 2m, one for 70cm that I could be talked into selling and an eight foot FG crossboom. All of this equipment is still mounted on a short tower, but can be removed easily. I can provide pictures if needed. Thanks for the BW. 73, Joel, W4JBB -- Joel Black jbblack(at)charter.net ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: CP antenna from 2 WiFi panels
- Original Message - From: "Greg D." To: Sent: Sunday, June 06, 2010 10:15 PM Subject: [amsat-bb] CP antenna from 2 WiFi panels > > Hi folks, > > Before I start nailing stuff together, I just want to verify what I'm > doing... > > I want to make a 2.4ghz Right-Hand Circular antenna from two flat panel > Wi-Fi antennas. The idea is to mount >them at 90 degrees from each other, > with one 1/4 wavelength in front of the other. Combine the two feeds with > a simple Tee (the feeds are of equal length), and into the pre-amp. Since > I'm not transmitting, I'm not too worried >about the resulting 25 ohm > impedance (or should I be?). Hi Greg, KO6TH You should be worried because even on receiving your VSWR is 50/25 = 2 and since the downconverter has been tuned for the lovest noise figure with a 50 ohm noise source it happens that the noise generated by your downconverter will be greater than you should expect with an input VSWR = 1 > > If it matters, the panels are from HyperLink Technologies, their model > HG2414P, with a claimed 14dBi gain. > > So, the questions: > > 1. 1/4 wavelength at 2401 mhz is ((3 x 10**8 / 2401 x 10**6) / 4) meters, > or about 1.23 inches. Right? > Right, but 1.23 inches is a too short distance to mechanically separate by 1/4 wavelenght two flat panels so that if necessary it will more convenient to use for spacing an odd numbar of 1/4 wavelenghts into free space at 2401 MHz and use two coax feed lines of the same lenght. > 2. Most of our 2.4 ghz satellite downlinks seem to be either linear or > RHCP, so I'm guessing that RHCP is >probably the preferred construction. > (Yes?) All 2.4 GHz downlinks on the actual satellites are linear so that no matter if you connect the antenna for RHCP or LHCP > > 3. Looking at the Satellite Experimenter's Handbook (figure 7-10), I > believe the panel rotated 90 degrees counter->clockwise as seen from > behind > the panels should be the one farther out in front, for RHCP. (Their > picture shows >clockwise for LHCP.) Is this correct? > It depends if you connect the inner conductor of the coax cables to A or to A' for the front dipole and to B or to B' for the rear dipole. In a separate email I will send to you a drawing to explain how two linearly polarized waves radiated as a 90° components combines each other to generate a resultant wave that can be RHCP or LHCP. > Thanks, > > Greg KO6TH > 73" de i8CVS Domenico ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] CP antenna from 2 WiFi panels
Hi folks, Before I start nailing stuff together, I just want to verify what I'm doing... I want to make a 2.4ghz Right-Hand Circular antenna from two flat panel Wi-Fi antennas. The idea is to mount them at 90 degrees from each other, with one 1/4 wavelength in front of the other. Combine the two feeds with a simple Tee (the feeds are of equal length), and into the pre-amp. Since I'm not transmitting, I'm not too worried about the resulting 25 ohm impedance (or should I be?). If it matters, the panels are from HyperLink Technologies, their model HG2414P, with a claimed 14dBi gain. So, the questions: 1. 1/4 wavelength at 2401 mhz is ((3 x 10**8 / 2401 x 10**6) / 4) meters, or about 1.23 inches. Right? 2. Most of our 2.4 ghz satellite downlinks seem to be either linear or RHCP, so I'm guessing that RHCP is probably the preferred construction. (Yes?) 3. Looking at the Satellite Experimenter's Handbook (figure 7-10), I believe the panel rotated 90 degrees counter-clockwise as seen from behind the panels should be the one farther out in front, for RHCP. (Their picture shows clockwise for LHCP.) Is this correct? Thanks, Greg KO6TH _ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Falcon 9 video - moving early?
Yes we all know this, and have heard and seen it a hundred times. t-9 and ignition sequence has started, and you see all the engines starting up. But what the original poster questioned wasn't that. but that it left the pad early. even on the shuttle or the giant Saturn 5 launches. ignition starts yes long before zero, but the rocket or shuttle never left the ground before zero, whereas on the video seen here of this launch it is very clear by both the digital timer and audio countdown that the rocket has left the pad and is airborne clearly 3 seconds before zero. Joe The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 6/6/2010 2:43 PM, Jeff Moore wrote: > That sort of thing is actually common practice. The Shuttle, for example, > fires the main engines and allows them to get up to thrust and stabilize > while the vehicle is still clamped down, then they fire the solid boosters, > then they let it go. > > Jeff Moore -- KE7ACY > BAR - Born Again Rocketeer > CN94 > > - Original Message - From: "Elan Portnoy" > > > >> That's been the case even earlier as well. Listen to >> any of the countdowns for the Apollo lunar missions. >> The Saturn V's engines would ignite at about T-9 and take a >> few seconds to produce full thrust before lift-off at T = >> 0. >> > > I remember the announcer saying something to the effect of, "T minus 9, > ignition sequence has started." > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > > ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Falcon 9 video - moving early?
That sort of thing is actually common practice. The Shuttle, for example, fires the main engines and allows them to get up to thrust and stabilize while the vehicle is still clamped down, then they fire the solid boosters, then they let it go. Jeff Moore -- KE7ACY BAR - Born Again Rocketeer CN94 - Original Message - From: "Elan Portnoy" > That's been the case even earlier as well. Listen to > any of the countdowns for the Apollo lunar missions. > The Saturn V's engines would ignite at about T-9 and take a > few seconds to produce full thrust before lift-off at T = > 0. I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started." ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Falcon 9 video - moving early?
> That's been the case even earlier as well. Listen to > any of the countdowns for the Apollo lunar missions. > The Saturn V's engines would ignite at about T-9 and take a > few seconds to produce full thrust before lift-off at T = > 0. I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started." ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] WD9EWK @ DM56fd now
Hi! There was no safe place to park along US-191 at the DM55/DM56 line, so I drove north to the town of Chinle, at DM56fd, to work various passes. I will be ready for SO50 in about 15 minutes. 73! Patrick WD9EWK/VA7EWK - Chinle, Arizona http://www.wd9ewk.net/ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] QSLs sent
To all who have sent me QSLs over the last several years. I am finally getting back in to the hobby and sat down last night and filled out a bunch of cards. S if anyone was waiting for VT on the sats from either W1ICW or WE1U, your patience is about to be rewarded. I am ashamed to admit some of the cards had 34 cent stamps on the SASEs... that's how far behind I had gotten. Again, my apologies and 73, Bob W1ICW ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Reminder
All Members, This is one of the most important happenings in the AMSAT organization. Not to have a deluge of nominations, however, this is the opportunity for those that have condemned, commented, misrepresented facts, assumed, found unresponsive, answered their own questions, incomplete readings of postings, jumping the gun etc. to give some input to AMSAT's future. To those that will vote for nominees, look carefully at the qualifications and remember our past history of taking the higher roads for our organization. Hat's off to our volunteers and the time, effort and input towards our goals. (see ANS 150 & ANS 157) Dee, NB2F -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Martha Sent: Thursday, June 03, 2010 4:18 PM To: AMSAT BB Subject: [amsat-bb] Reminder Nominations for the AMSAT Board of Directors must arrive at the AMSAT Office no later than June 15th. A nomination requires either one current Member Society or five current individual members. Three directors' terms expire this year. -- 73- Martha ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: FIELD DAY SCORING
Yes guys, This makes it important as an AMSAT satellite operator doesn't have to put his gear away after one(1) contact. He can still Demo the sats for the observers. Good luck being heard through the 50 watters... Good job Pete. 73, Dee, NB2F -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Bruce Sent: Saturday, June 05, 2010 11:13 AM To: Peter Portanova Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: FIELD DAY SCORING That should make it much easier for everyone as you don't have to do one log and then strip out the unwanted calls for the other. Thanks Pete. I am glad that the two minds (ARRL and AMSAT) have become one. 73...bruce From: Peter Portanova To: amsaT-BB@amsat.org Sent: Sat, June 5, 2010 9:33:07 AM Subject: [amsat-bb] FIELD DAY SCORING Hello, I was in contact with the ARRL, after I read 7.3.7. and 7.3.7.1. in the Field Day Rules. I mentioned to the League that I would like them to point out where in those rules it would prohibit scoring the same call on multiple Linear Satellites. They listened to my point's and agreed that even though the rules refer to satellite contacts as a separate "band" there is nothing in those rules that prohibit the aforementioned scoring. In conclusion Field Day and the AMSAT scoring are now in agreement, have fun. 73's Pete WB2OQQ www.massapequanyweather.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Re HELIX REFLECTOR?
For space oriented antenna (satellite, eme, radio astronomy) that are elevated to the sky, the height above ground should not matter since ground-gain is not a factor once a minimum of elevation occurs. Many antennas in these services are mounted close to ground to achieve several objectives: 1) mechanical stability 2) lowered exposure to man-made RF interference 3) cost 4) maintenance access 5) lower physical exposure (wind area). The response to radiation in other than the prime direction is very important to reduce both interference and thermal ground noise. F/B is just one of these parameters. Sidelobe level is another. It is not primarily a pursuit of maximum gain that is important for maximum receive sensitivity. The parameter that measures this is called G/T ratio (gain/temperature ratio). So often some gain is sacrificed to achieve lower (noise) temperature. One should be sure that the E-M field of the driven element of the antenna system is not affected by ground or other nearby objects that can either de-tune of distort the pattern. But other than that height is not a factor. Only when the antenna elevation is near the horizon is this not true. Typically eme'rs see ground-gain effects only below about 10-degrees elevation. 73, Ed The Ohio State Big Ear Radiotelescope reflector was mounted with the lower edge on the ground. The ground between the parabolic sector antenna and the tiltable reflector was a conducting metallic surface. But this is diverges from the original topic. At 05:21 PM 6/5/2010, i8cvs wrote: >Hi John, > >I agree with you. > >I have in my hands the book "RADIO ASTRONOMY" by John Kraus >ISBN 07-035392-1 > >This is the text of page-200 > >"An example of a partially steerable (meridian transit) array antenna is >presented in Fig.6-41 >This antenna,built in 1952 at the Ohio State University radio observatory, >consists of an array of 96 helical-beam antennas, each of 11 turns, mounted >on a tiltable steel grounded ground plane 160 ft long (east-west) by 22 ft >wide. At a wavelenght of 1.2 meters the beam width measured 1 degree in >right ascension by 8 degrees in declination." > >My comment: > >As seen from the photograph 6.41 the tiltable steel ground plane seems to be >mounted at no more than 10 to 12 ft from the ground so that when the >reflector is very large it seems that the high of it from the ground is not >very important both for gain and front to back ratio. > >In this array the tiltable steel ground plane is 160 ft long and 22 ft wide >with 24 helices in the longer side and 4 line of helices in the wide side >(24 x 4 = 96 helices) so that the total ground plane area is 160 x 22 = 3520 >square foot and each helix reflector takes 3520 / 96 = 37 square foot or >about a square surface of 6 x 6 foot or a round area of 3.4 square meters >with a diameter of 2.08 meters. > >Since the operating wavelenght of the radiotelescope is 1.2 meters the >reflector diameter for each helix antenna has been made large >2.08 / 1.2 = 1.73 wavelenght and probably this is why a tiltable steel >ground plane made so large can be mounted very close to the ground >surface without affecting gain, front to back ratio and without to take >too much noise at 290 kelvin from the ground. > >73" de > >i8CVS Domenico > >- Original Message - >From: "John Belstner" >To: "Clare Fowler" >Cc: "amsat-bb" >Sent: Saturday, June 05, 2010 11:07 PM >Subject: [amsat-bb] Re: Re HELIX REFLECTOR? > > > > Just another $0.02 to add. > > > > You will find that the size and shape of the reflector will not affect the > > forward gain as much as it does the F/B ratio. It depends on what is > > important to you and (of course) how high you are above the ground. Even > > for satellite operation pointing up, large back lobes reflecting off the > > ground can adversely affect the forward pattern when the antenna is > > mounted only 6-8 feet above ground. > > > > On Jun 4, 2010, at 10:13 PM, Clare Fowler wrote: > > > > > > > > To add to the discussion the July/Aug 2007 Amsat Journal has an article > > > covering some gain comparisonmeasurements I made between four > > > 13 turn (2.88 wavelengths) 13cm antennas with different square solid > > > aluminum reflectors. > > > The sizes were 0.56 wavelengths, 0.84 wavelengths, 1.0 wavelength and > >> 1.4 wavelengths. > > > There was no difference between the 0.84, 1.0 and 1.4 wavelengths but > > > the antenna with the0.56 wavelength reflector had 1.5 db less gain. > > > > > > However for my 70cm helix antennas I followed the Satellite Handbook > > > minimum size of 0.6 wavelengthsor slightly over 16 inches. I used 1/2 > > > inch hardware cloth mesh to keep the weight and windloading down. > > > These antennas have performed well however it appears that they would be > > > a bit better with a somewhat larger reflector. > > > > > > A brief description and picture of the 70 cm reflector is in the > > > November/December 2005 Amsat Journal ar
