[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 CE3SNA07 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] X-37B - ZS1BI in Sunday Times article
Greg Roberts ZS1BI features in an article in the South African Sunday Times, see http://www.southgatearc.org/news/june2010/threat_to_us_security.htm 73 Trevor M5AKA ___ 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] As the Sun Awakens, NASA Keeps a Wary Eye on Space Weather
http://science.nasa.gov/science-news/science-at-nasa/2010/04jun_swef/ Life is short. Be swift to love! Make haste to be kind! - Henri Frederic Amiel, philosopher and writer (1821-1881) ___ 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] Rotator position potentiometer replacment part
I am looking for a replacement 500 ohms potentiometer for my Daiwa DC7011 rotator. 73, David, 4x6ia ___ 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
Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org On Jun 6, 2010, at 1:15 PM, Greg D. wrote: 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=multicalendarocid=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 ___ 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?
A few years ago at the Amsat Colloquium University of Surrey we were privilaged to have astronaut Ron Parise (SK) as a guest speaker. He explained the ignition suquence for the shuttle in a very entertaining way, as best I remember it went like this As the engines come up to thrust the explosive bolts fire and away she goes. If one of the pyrotchnics fails its no problem the bolt just gets ripped out of the concrete 73 John G7HIA From: Jeff Moore tnetcen...@gmail.com To: amsat-bb@amsat.org Sent: Sunday, 6 June, 2010 20:43:11 Subject: [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 elanport...@yahoo.com 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] First QSO
Finally did it made first contact via satellite (SO-50_ today 6/7/10 at 15:18U with K8YSE . Thanks John for coming back to me. Don WB8ZOM It is quite a learning curve but if you can hang in long enough you can do it. The bug has now put a big bite on me Don WB8Z)M ___ 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: First QSO
Congratulations, Don - and welcome to orbit! Here, the excitement hasn't gotten old after almost two years. Working the satellites is the most fun and satisfying thing I've ever done in amateur radio. I wish you all the best as you continue working passes and making lots more contacts. 73 and God Bless, Tim - N3TL From: Don don1...@comcast.net To: amsat-bb@amsat.org Sent: Mon, June 7, 2010 12:21:54 PM Subject: [amsat-bb] First QSO Finally did it made first contact via satellite (SO-50_ today 6/7/10 at 15:18U with K8YSE . Thanks John for coming back to me. Don WB8ZOM It is quite a learning curve but if you can hang in long enough you can do it. The bug has now put a big bite on me Don WB8Z)M ___ 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: First QSO
Congratas Don! Be aware this is an addictive part of ham radio-there is no cure grin 73 Bob W7LRD Seattle - Original Message - From: Don don1...@comcast.net To: amsat-bb@amsat.org Sent: Monday, June 7, 2010 9:21:54 AM GMT -08:00 US/Canada Pacific Subject: [amsat-bb] First QSO Finally did it made first contact via satellite (SO-50_ today 6/7/10 at 15:18U with K8YSE . Thanks John for coming back to me. Don WB8ZOM It is quite a learning curve but if you can hang in long enough you can do it. The bug has now put a big bite on me Don WB8Z)M ___ 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: First QSO
Don, Not only was it you're first contact but you also picked a satellite, SO-50 which is a challenge sometimes to operate! Ok, now you're on your way towards VUCC!! 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
[amsat-bb] (no subject)
http://scipion.chez.com/default.php ___ 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: John Belstner jbelst...@yahoo.com To: Greg D. ko6th_g...@hotmail.com Cc: amsat-bb@amsat.org Sent: Monday, June 07, 2010 4:37 PM Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org Hi John, W9EN I would like to know if these panels are patch style antennas linearly or circularly polarized. Tanks 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] Re: CP antenna from 2 WiFi panels
- Original Message - From: John Belstner jbelst...@yahoo.com To: Greg D. ko6th_g...@hotmail.com Cc: amsat-bb@amsat.org Sent: Monday, June 07, 2010 4:37 PM Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org Hi John, W9EN I would like to know if these panels are patch style antennas linearly or circularly polarized. Tanks 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] Re: (no subject)
SPAM get out On Mon, Jun 7, 2010 at 1:42 PM, Simone T terra...@gmail.com wrote: http://scipion.chez.com/default.php ___ 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: CP antenna from 2 WiFi panels
Hi Domenico, The HG2414P is a linearly polarized patch. http://www.34t.com/PDF/hg2414p.pdf The HG2409PC is a circular polarized patch (LH or RH available). http://www.34t.com/PDF/hg2409pc.pdf They are about the same price too. 73, John On Jun 7, 2010, at 3:23 PM, i8cvs wrote: - Original Message - From: John Belstner jbelst...@yahoo.com To: Greg D. ko6th_g...@hotmail.com Cc: amsat-bb@amsat.org Sent: Monday, June 07, 2010 4:37 PM Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org Hi John, W9EN I would like to know if these panels are patch style antennas linearly or circularly polarized. Tanks 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] Re: (no subject)
At 09:08 AM 6/8/2010, Larry Teran wrote: SPAM get out On Mon, Jun 7, 2010 at 1:42 PM, Simone T terra...@gmail.com wrote: snip to avoid propagating spam URL further These ones are the result of the account's owner getting infected with something, and a spam bot hijacking their account. Complaining about the spam does nothing (never does). The most successful approach has been to inform the affected person of the problem, and get them to scan their PC with something like the free scanner from www.malwarebytes.org , or another good malware scanner, then change their webmail password. There is a pattern to this sort of spam/infection: 1. It ALWAYS comes from a webmail capable address (I have seen Yahoo, Gmail and Hotmail accounts infected). 2. It always features a single line with a URL, maybe with one line of generic text Hey, look at this or similar. How I discovered it was the account owner's PC being infected was that I posted an advisory message in the group that was getting spam, and suggesting everyone check their PC for malware. The account owner (that the spam claimed to come from) came forward and described what happened, and that they had fixed their system, once made aware of the problem. Subsequent instances of this type of spam have revealed a similar pattern. This was first sighted a few months ago. Anyway, hope this helps people affected by this sort of problem to find and remove the offending malware. 73 de VK3JED / VK3IRL http://vkradio.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
[amsat-bb] Re: FIELD DAY SCORING/ Hamfest
Dee, Yes Dee good point, now that a station can make FD points on all the Linear Satellite's it might encourage Clubs to increase their AMSAT visability and run a complete station. It will be another opportunity to help DARA add more matching funds towards our goal of Getting Back into Space. I had a fantastic Hamfest hosted by LIMARC, we had a very visable location, next to the well designed Great South Bay ARC's communications trailer, which brought more visitors to our AMSAT Booth. I want to thank K2TV, AB2ZI, W2JGH, K2IZ, W2HCB and KA2CAQ, all graduates of my satellite classes who helped with the non-stop visitors to our booth. I also want to thank, Richie, K2KNB, who headed the LIMARC Hamfest and the other volunteers for making AMSAT so welcome, you always run a big succesful event. I will be making a satellite presentation to the club in November. I have attached a few pictures of the day.. 73's Pete WB2OQQ AMSAT NY Area Coordinator 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
[amsat-bb] Re: First QSO
Congrats, Don. I hope to soon be posting a message like this myself. 73, KC8LPZ On Mon, Jun 7, 2010 at 12:21 PM, Don don1...@comcast.net wrote: Finally did it made first contact via satellite (SO-50_ today 6/7/10 at 15:18U with K8YSE . Thanks John for coming back to me. Don WB8ZOM It is quite a learning curve but if you can hang in long enough you can do it. The bug has now put a big bite on me Don WB8Z)M ___ 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?
And I heard in a presentation at the Cape some years ago that We are so sure the solid rockets will ignite that we send the command to blow the hold down bolts before we send the solid rocket ignition command. Also I heard from somebody that the fractured hold down bolts are presented to the shuttle crew members as souvenirs after they return to Earth. Dan Schultz N8FGV A few years ago at the Amsat Colloquium University of Surrey we were privilaged to have astronaut Ron Parise (SK) as a guest speaker. He explained the ignition suquence for the shuttle in a very entertaining way, as best I remember it went like this As the engines?come up to thrust the explosive bolts fire and away she goes. If one of the pyrotchnics?fails its no problem the bolt? just gets ripped out of the concrete 73 John G7HIA ___ 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
You can place them side by side and introduce the delay in the feed line of one as well. 73, Joe kk0sd -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of John Belstner Sent: Monday, June 07, 2010 9:37 AM To: Greg D. Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org On Jun 6, 2010, at 1:15 PM, Greg D. wrote: 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=multicalendarocid=PID28 326::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 ___ 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: CP antenna from 2 WiFi panels
Hi John, At best? Interesting... I've seen many diagrams about mounting two linear YAGIs at 90 degrees from each other on the same cross arm, with the appropriate phasing harness. My plan is to mount the two panels the same; one next to the other, rotated 45 degrees in opposite directions on the cross arm, with one pushed out 1.23 inches by a block of wood. How bad will this be? One will surely get some elliptical effects when the satellite is off-axis, but keeping them aimed at the satellite is what the rotor and computer are for... I understand that I'm losing some NF by not using a proper splitter, but I don't have one handy, and this is (was) supposed to be a low effort adventure. Again, for AO-51 VS, I should have plenty of margin. I've built several helixes, both 2.4 ghz for the feed to my BBQ grill, and my current L-band uplink, and could do the same here. But, back to the low effort part of things... If this simply isn't going to work, then I'll just leave my current setup alone. It consists of a 3 3/4 turn helix feeding a 30 inch BBQ grill, lined with window screen. All combined, it's kind of heavy, and the wooden cross arm is showing the effects of the weight and its age. It was built for AO-40, and for the current satellites I don't really need this much gain, hence the replacement idea. Bad idea? Greg KO6TH Subject: Re: [amsat-bb] CP antenna from 2 WiFi panels From: jbelst...@yahoo.com Date: Mon, 7 Jun 2010 07:37:17 -0700 CC: amsat-bb@amsat.org To: ko6th_g...@hotmail.com Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org On Jun 6, 2010, at 1:15 PM, Greg D. wrote: 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=multicalendarocid=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 _ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccountocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4 ___ 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: First QSO
Congrats, Don! That bug bit me about 17 years ago. It still hasn't let go. Greg KO6TH (RS-10, with a QSO from California to New York on 10 watts to a copper pipe J-pole for the 2m uplink, and a wire strung out to a tree in the back yard hooked to a Radio Shack shortwave receiver for the 10 meter downlink) From: don1...@comcast.net To: amsat-bb@amsat.org Date: Mon, 7 Jun 2010 12:21:54 -0400 Subject: [amsat-bb] First QSO Finally did it made first contact via satellite (SO-50_ today 6/7/10 at 15:18U with K8YSE . Thanks John for coming back to me. Don WB8ZOM It is quite a learning curve but if you can hang in long enough you can do it. The bug has now put a big bite on me Don WB8Z)M ___ 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 _ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccountocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4 ___ 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
Hi Greg, What I meant by at best is that it will certainly be a challenge (at 2.5 GHz) to get one panel just a perfect 1/4 wavelength forward from the other. It will be equally as challenging (at 2.5 GHz) to make 75 ohm phasing cables some odd multiple of 1/4 wavelength. I say that because I found it quite challenging to make phasing cables for 1.3 GHz and even 440 MHz and I had a network analyzer to help me. Just when I thought I had it cut perfect I put the connector on and found myself 10 to 20 degrees off. That will affect the circularity of the polarization. I finally gave up and mounted the elements of one yagi 1/4 wavelength forward from the other and used equal length cables. Physical spacing is easier to achieve within a few degrees at the lower frequencies (VHF/UHF). Another alternative would have been to use a 90 degree broadband hybrid (that can handle 25 watts) but that was much more $ than I wanted to spend. If you have a helix already, I would use that. But don't let me talk you out of experimentation. It is possible and might be fun. 73, John Sent from my Verizon Wireless BlackBerry -Original Message- From: Greg D. ko6th_g...@hotmail.com Date: Mon, 7 Jun 2010 20:22:22 To: jbelst...@yahoo.com Cc: amsat-bb@amsat.org Subject: RE: [amsat-bb] CP antenna from 2 WiFi panels Hi John, At best? Interesting... I've seen many diagrams about mounting two linear YAGIs at 90 degrees from each other on the same cross arm, with the appropriate phasing harness. My plan is to mount the two panels the same; one next to the other, rotated 45 degrees in opposite directions on the cross arm, with one pushed out 1.23 inches by a block of wood. How bad will this be? One will surely get some elliptical effects when the satellite is off-axis, but keeping them aimed at the satellite is what the rotor and computer are for... I understand that I'm losing some NF by not using a proper splitter, but I don't have one handy, and this is (was) supposed to be a low effort adventure. Again, for AO-51 VS, I should have plenty of margin. I've built several helixes, both 2.4 ghz for the feed to my BBQ grill, and my current L-band uplink, and could do the same here. But, back to the low effort part of things... If this simply isn't going to work, then I'll just leave my current setup alone. It consists of a 3 3/4 turn helix feeding a 30 inch BBQ grill, lined with window screen. All combined, it's kind of heavy, and the wooden cross arm is showing the effects of the weight and its age. It was built for AO-40, and for the current satellites I don't really need this much gain, hence the replacement idea. Bad idea? Greg KO6TH Subject: Re: [amsat-bb] CP antenna from 2 WiFi panels From: jbelst...@yahoo.com Date: Mon, 7 Jun 2010 07:37:17 -0700 CC: amsat-bb@amsat.org To: ko6th_g...@hotmail.com Hi Greg, These panels are patch style antennas and as such you will not be able to place one behind the other to obtain circular polarization. Placing one next to the other will at best produce an elliptically polarized pattern, and you should use a 50 ohm splitter to keep your impedance 50 ohms. The shape of the patch and position of the feed point is typically how you obtain circular polarization with a patch antenna. Or, you can obtain RHCP with the same or more gain and less trouble by making a Helix. A sheet of aluminum, #8 copper wire and and a piece of PVC of the right diameter is all you need. http://brneurosci.org/helix-antenna.html Or, you can try just a single panel and see how it performs for a while. Good luck! 73, John W9EN DM13le w...@amsat.org On Jun 6, 2010, at 1:15 PM, Greg D. wrote: 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,
[amsat-bb] Re: First QSO
WB8ZOM Don, Congrats to you!! I'll always recall my first satellite QSO. It was with KA4KYI 2+ years ago. I was using my HF/VHF/UHF mobile station for those early contacts. It grows on you; I now have automated xcvr and rotor steering on 2M and 70CM and am getting ready to erect antennas for 1.2G and 2.4G. Hope to work you soon. 73, Larry W7IN, DN27 Montana ___ 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
