[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] SatPC32 Error Messages
On startup, I get OLE-fehler 80045030 in a popup box. This happens twice before the program will start. Anyone have this problem too? Thanks, Elan - WB2IOL ___ 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] Anyone using Gpredict with an IC-910h?
I've got the rotator tracking (Fox Delta + G5400) but having trouble with the rig freq control for uplink downlink Doppler correction. Anyone have any suggestions? Dell GX270 IC-910H Gpredict on Ubuntu Linux Onboard serial ports @ 19200 Fox Delta STS-2 (?? I think, maybe 3) Funny looking antennas on a nasty 25' stick which spins around and is attached to the porch. 73, Elan - WB2IOL ___ 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] Hams and Emergency Comms...
I lived in NYC close to the World Trade Center during September of 2001. For me, the matter was settled during the 9/11 attack. I was on the communications team supporting the Red Cross in response to the aftermath where I witnessed firsthand, the necessity for hams to be a part of the communications system. When the Twin Towers collapsed, the local cell phone infrastructure went with them. Mobile phones were useless for quite a while and landlines were overloaded--making calls in or out of the area nearly impossible. ALL of our public services (PD, Fire, EMS, etc.) were completely overwhelmed and focused on ground zero where firemen, cops, civilians., etc. where dying by the scores; jumping out windows to escape the inferno inside the building and crushed under fallen debrischaos on the public service freqencies and those outside the city couldn't communicate with family members and friends scrambling from what had already happened...and what might happen next. Ham radio was critical in the coordination of rescue and relief efforts. Operators halled car batteries on luggage carts, antennas stuck to anything metal (tables, chairs, bookcases, file cabinets) stationed at high school gyms, makeshift shelters, on ambulances, at ground zero, etc. We kept our cool, remained organized and efficiently assisted in any way we could--it worked flawlessly. Something like that fatefull day on a warm, clear day in September will probably happen again. I'm ready and willing--even if I have just a wet noodle, my trusty Clegg HT with one crystal and a bag full of D cell batteries. ___ 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: Spacewalks
Appologies if my message appeared rude--didn't mean it to be. Elan - WB2IOL --- On Sat, 2/13/10, Vince Fiscus, KB7ADL vlfis...@mcn.net wrote: From: Vince Fiscus, KB7ADL vlfis...@mcn.net Subject: [amsat-bb] Re: Spacewalks To: amsat-bb@amsat.org Date: Saturday, February 13, 2010, 10:33 AM At 09:14 AM 2/12/2010 -0800, Elan Portnoy elanport...@yahoo.com wrote: Hi, I'm sure you don't mean intercept but monitor. Have a look at this page http://www.orbitessera.com/html/space_shuttle.html Has the frequencies listed--never tried to copy them myself. Elan - WB2IOL That page hasn't been updated in a while. KB7ADL ___ 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: Spacewalks
Hi, I'm sure you don't mean intercept but monitor. Have a look at this page http://www.orbitessera.com/html/space_shuttle.html Has the frequencies listed--never tried to copy them myself. Elan - WB2IOL --- On Fri, 2/12/10, Vince Fiscus, KB7ADL vlfis...@mcn.net wrote: From: Vince Fiscus, KB7ADL vlfis...@mcn.net Subject: [amsat-bb] Spacewalks To: amsat-bb@amsat.org Date: Friday, February 12, 2010, 10:22 AM I was thinking while watching last nights EVA on the ISS, has anyone here ever tried to intercept the space suit communications during EVA's? I'm not sure what the output of the transmitters are, but with a good system you still should be able to hear 100 - 200mw. Probably a weird digital transmission mode so you still wouldn't be able to tell was they were saying, but that's why there is NasaTV. ___ 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: AO-51 Signal Strength Post Flip
You are on-the-nose John. Currently, I AOS and LOS AO-51 at higher elevations than before the initial flip. During high passes, the downlink is no longer DFQ or is as strong as before, and there are more fades (was better with leaves still on the trees!). I have questioned my antenna calibration; it appears to be where it was previously. Clock, Keps, etc., all good too. So that's my observation--jives with John's. Of course I am appreciative of the team keeping her chugging, but feedback is helpful I'm sure. 73, Elan WB2IOL ___ 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: COMPASS-1 Close Approach
Good thing, I have a fondness for that bird. --- On Fri, 1/22/10, Mike Rupprecht m...@mike-rupprecht.de wrote: From: Mike Rupprecht m...@mike-rupprecht.de Subject: [amsat-bb] Re: COMPASS-1 Close Approach To: amsat-bb@amsat.org Date: Friday, January 22, 2010, 9:00 AM All, COMPASS-1 lives! That was a close shave Many thanks for all the reports I received! It's so good to have friends. 73, Mike DK3WN [amsat-bb] COMPASS-1 Close Approach All, United States Joint Space Operations Center (JSpOC) has identified predicted close approach between COMPASS-1 (#32787) and SICH-1 (#23657). Jan 22 14:27 UTC - predicted distance: 429 m (overall) Can someone listen to the COMPASS-1 beacon (437.275 MHz CW) after this time, please? It’s the first US East-Coast pass on this day. Any reports are very appreciated. Thanks in advance! 73, Mike DK3WN ___ 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: AO-51 back into normal configuration
Congratulations! I had three just a few months ago--changes everything. --- On Mon, 1/4/10, Andrew Glasbrenner glasbren...@mindspring.com wrote: From: Andrew Glasbrenner glasbren...@mindspring.com Subject: [amsat-bb] AO-51 back into normal configuration To: Amsat-BB amsat-bb@amsat.org, AO51 Modes ao51-mo...@amsat.org Date: Monday, January 4, 2010, 6:10 AM AO-51 is back in to it's normal configuration with the 145.920/435.300 repeater at 570 mw and the 1268.700/435.150 9k6 PBBS and Telemetry at 450 mw. For the month of January we expect to leave the satellite in this configuration. Sometime next week we expect to use the reversible magnet to reorient the spacecraft to the normal polarity favoring the northern hemisphere. This is dependent of the timing of some personal issues including the impending birth of my son :-) . Towards the end of the month I expect we can run some L/U voice on the 435.150 downlink between telemetry collections, but that is not yet reflected on the official schedule. Please address all AO-51 inquiries to the Operations Committee vi ao51-mo...@amsat.org. 73, Drew KO4MA AMSAT-NA VP Operations ___ 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: Station Integration
Take a look at SatPC32. I use it and love it--does everything. --- On Fri, 1/1/10, Randy Hall listk7...@gmail.com wrote: From: Randy Hall listk7...@gmail.com Subject: [amsat-bb] Station Integration To: AMSAT BBS amsat-bb@amsat.org Date: Friday, January 1, 2010, 9:08 AM Hi, I am looking to get my station automated again. Years ago I was running WISP, FT-736, Yaesu Az-El rotor and TAPR Trackbox. It was a really cool system watching it completely automate the message transfers to the satellites. Then came along the internet.. I now use Orbitron and a TS-2000. Still have the same rotor. The TrackBox is sitting in the garage, but could be brought back to life. I never changed the proms for Y2K!!! So, what is the current equipment being used to tie the tracking software to control the rotor and radio these days? I am not tied to Orbitron or the Trackbox, if I need to get something else more up to date that is fine. Thoughts about integrating my station together again? Randy K7AGE ___ 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] RS-38?
I seem to have trouble finding data on this bird. Can someone point me to keps, etc. so I can load her into SatPC? Thanks, Elan - WB2IOL --- On Thu, 12/31/09, Andrew Rich vk4...@tech-software.net wrote: From: Andrew Rich vk4...@tech-software.net Subject: [amsat-bb] Working my way thru the birds To: amsat-bb@amsat.org Date: Thursday, December 31, 2009, 5:58 AM Using my new sat_reporter page http://vk4tec.no-ip.org/sat_report/ Andrew Rich VK4TEC ___ 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: Working my way thru the birds
Really great! Thanks for building this. I was thinking it would be a great thing to have. Wish list: 1) Sort by callsign as well as bird. This way I can see what my reports were in one chunk. Maybe break apart call and location? 2) Add field for grid. Thanks! I really like it. Elan - WB2IOL --- On Thu, 12/31/09, Andrew Rich vk4...@tech-software.net wrote: From: Andrew Rich vk4...@tech-software.net Subject: [amsat-bb] Working my way thru the birds To: amsat-bb@amsat.org Date: Thursday, December 31, 2009, 5:58 AM Using my new sat_reporter page http://vk4tec.no-ip.org/sat_report/ Andrew Rich VK4TEC ___ 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: RS-38?
Now that I know where to find them, perhaps I will sign up. I never asked anyone to download them for me--perhaps you should read my post more carefully--or ask someone else to read it to you. --- On Fri, 1/1/10, Nigel Gunn G8IFF/W8IFF ni...@ngunn.net wrote: From: Nigel Gunn G8IFF/W8IFF ni...@ngunn.net Subject: Re: [amsat-bb] RS-38? To: Elan Portnoy elanport...@yahoo.com Cc: amsat-bb@amsat.org Date: Friday, January 1, 2010, 4:18 PM If you want keps for the newest sats then sign up to Space-Track and download them yourself rather than waiting for someone else to do it. On 01-Jan-10 16:06, Elan Portnoy wrote: I seem to have trouble finding data on this bird. Can someone point me to keps, etc. so I can load her into SatPC? ___ 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 Hand-Held contacts
Isn't that a great feeling? I love it when something attempted works! --- On Thu, 12/31/09, Lee Ernstrom iamsavedbygr...@q.com wrote: From: Lee Ernstrom iamsavedbygr...@q.com Subject: [amsat-bb] First Hand-Held contacts To: amsat-bb@amsat.org Date: Thursday, December 31, 2009, 6:43 AM I just completed my first QSOs through AO-51 at 12:25 UTC on my new DJ-G7 handheld and the Arrow antenna while standing on the back porch in a snow storm in the dark and cold. Thank you KJ4MCZ in FN42 and N5AFV in EL29 for being the first. I am now smittin. WA7HQD Lee Ernstrom, DN31 ___ 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: Preamp location tech question
Yes, thank you for that detailed explanation and analysis. Best 73, Elan --- On Sun, 12/20/09, i8cvs domenico.i8...@tin.it wrote: From: i8cvs domenico.i8...@tin.it Subject: Re: [amsat-bb] Re: Preamp location tech question To: Elan Portnoy elanport...@yahoo.com, amsat bb amsat-bb@amsat.org Date: Sunday, December 20, 2009, 4:23 PM Hi Elan, You don't mention the model of preamplifiers from ARR that you are using but I suppose that you got the better between the tree models available i.e. the SP144VDG 144-148 MHz with NF = 0.55 dB and the SP432VDG 420-450 MHz with NF= 0.55 dB Now if you add between the antenna and preamplifiers 50 feet of coax cable LMR400 then the loss of 0.75 dB at 144 MHz and the loss of 1.35 dB at 435 MHz adds to the Noise Figure of your preamplifiers so that it is like to have: a 144 MHz preamplifier with an overall NF = 0.55 + 0.75 = 1.3 dB a 435 MHz preamplifier with an overall NF = 0.55 + 1.35 = 1.9 dB Supposing that you have the preamplifier antenna mounted working out the numbars for 144 MHz we get: Noise Figure NF = 0.55 dB Noise Factor F = 10^(NF/10) = 10^0.055 = 1.13 The equivalent Noise Temperature T = (1.13 -1 ) x 290 = 39 kelvin If you live in a rural area at 144 MHz the equivalent Noise Antenna Temperature T1=200 kelvin so that your Tsys1=39+200= 239 kelvin Let see what happens if you mount the preamplifier in the shack: Overall Noise Figure = 0.55 + 0.75 = 1.3 dB Overall Noise Factor F = 10^(10/1.3) = 10^0.13 = 1.35 The equivalent Noise Temperature T = (1.35-1) x 290 = 101 kelvin Since the antenna is the same Tsys2 = 101+200 = 301 kelvin The improvement putting the preamplifier antenna mounted against shack mounted is 10 log (Tsys2 / Tsys1 ) = 10 log (301 / 239 ) = 1.0 dB 10 10 The improvement at 144 MHz is very small because the Antenna Temperature = 200 kelvin predominates. Let see the situation for 435 MHz were the Antenna Temperature is less and only 50 kelvin in a rural area Preamplifier antenna mounted: Noise Figure NF = 0.55 dB Noise Factor F = 10^(NF/10) = 10^0.055 = 1.13 The equivalent Noise Temperature T = (1.13 -1 ) x 290 = 39 kelvin If you live in a rural area the equivalent Noise Antenna Temperature T1 = 50 kelvin so that your Tsys1 = 39 + 50 = 89 kelvin Preamplifier in the shak: Overall Noise Figure = 0.55 + 1.35 = 1.9 dB Overall Noise Factor F = 10^(10/1.9) = 10^0.19 = 1.55 The equivalent Noise Temperature T = (1.55-1) x 290 = 159 kelvin Since the antenna is the same Tsys2 = 159 +50 = 209 kelvin The improvement with the preamplifier antenna mounted against shack mounted is 10 log (Tsys2 / Tsys1 ) = 10 log (209 / 89 ) = 3.7 dB 10 10 The improvement in 435 MHz is greater because the Antenna Temperature = 50 kelvin do not predominates over the equivalent Preamplifier Noise Temperature. By the way 3.7 dB of more swing in the S meter over the noise is more than half of a S point so that in your situation I would put only the 435 MHz preamplifier at the antenna and would leave the 144 MHz preamplifier in the shack. CONCLUSION: Since the loss of 50 feet of LMR400 is very small the advantage in (S+N)/N ratio to put the low noise preamplifiers antenna mounted is only 1 db at 144 MHz and 3.7 dB at 435 MHz in a rural area. If the installation is made in a suburban area or in a urban area where the equivalent Antenna Noise level is greater and predominates then the advantages are accordingly less. I hope this helps. 73 de i8CVS Domenico - Original Message - From: Elan Portnoy elanport...@yahoo.com To: amsat bb amsat-bb@amsat.org Sent: Sunday, December 20, 2009 6:40 PM Subject: [amsat-bb] Re: Preamp location tech question Well, it's clear what I should do. Will try remounting on masts as soon as weather permits. Looking forward to improvements in performance. Thanks to all and happy holidays! ___ 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: satpc ??
Make sure CO-56 is not selected to your group. I had the same trouble until removing it. It's no longer in orbit, so the Keps must be omitted from the file. Good luck, Elan - WB2IOL --- On Sun, 12/20/09, Bob- W7LRD w7...@comcast.net wrote: From: Bob- W7LRD w7...@comcast.net Subject: [amsat-bb] satpc ?? To: amsat-bb@amsat.org Date: Sunday, December 20, 2009, 12:25 AM I downloaded new keps now I get a box that says, ungultrige Gleitkommaoperation marching across the screen that won't stop unless I restart the computer. Assistance please. 73 Bob W7LRD ___ 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] Preamp location tech question
Hello all, In the midst of all the excitement around the new birds, I have a question for all of you: I have ARR preamps on both the 432 and 145 transmission lines. At the moment, they are located in shack, just before the transceiver. Both lines to antennas are 50 feet (15.24 meters) of LMR400. How much of a performance improvement should I expect from mast mounting the preamps? It could be done, but I'd rather keep them inside if there's nothing to be gained. Thanks, Elan - WB2IOL ___ 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] Please help me design a polarity switcher...
I have both vertical and horizontal elements of my 70cm yagi coming into the shack via separate runs of LM400. They meet in a box with bits of coax for matching and phasing before going to the radio. I would like to add a relay to make polarity changes quick and easy. Do I need to use a specific type of relay or will a garden variety DPDT from Radio Shack be sufficient? Thanks, Elan WB2IOL ___ 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: Filters and Preamps Question
Thanks for all the great responses. I'll try switching them around and see how it affects performance. Although I'm in Kansas City, RF pollution is not too bad at my particular location. One benefit of the filters is reduction of desensing the receiver when xmitting, especially with preamps on. 73, Elan WB2IOL ___ 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] List of Satellites to Track and Monitor...
Can someone point/provide a list of active birds to track? I enjoy just tracking and listening sometimes, but I'm probably unaware of all the possibilities. Have the AMSAT list on the website, but figured there are more than I'm aware of. Thanks, Elan WB2IOL ___ 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: What Are Others Using
SatPC32 works great on the linear birds. Takes a little tuning to get on the right freq, but works nicely after setup. --- On Thu, 10/15/09, Joel Black jbbl...@charter.net wrote: From: Joel Black jbbl...@charter.net Subject: [amsat-bb] What Are Others Using To: amsat-bb@amsat.org Date: Thursday, October 15, 2009, 6:15 PM Years ago, when I first started operating the satellites, I used an IC-821. I graduated up to an FT-847. I don't ever remember using software to tune the rig (the IC-821 or FT-847) only software to steer the antennas. For the life of me, I cannot seem to find my downlink using the FT-847 and *any* tuning software with the linear birds (AO-7 and VO-52). It works fine with the fixed freq FM birds which, understandably, is easier for it to track. I am just wondering, does *anyone* use tuning software with the linear birds or do you just tune it manually? 73, Joel, W4JBB ___ 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: accidental RF into wrong cable of Arrow=bad duplexer?
Duplexer are bi-directional. Essentially passive bandpass filters--don't care which way he RF flows. --- On Sun, 10/11/09, Tim Goodrich t...@timgoodrich.net wrote: From: Tim Goodrich t...@timgoodrich.net Subject: [amsat-bb] accidental RF into wrong cable of Arrow=bad duplexer? To: amsat-bb@amsat.org Date: Sunday, October 11, 2009, 3:51 PM I am an owner of a 2m/70cm LEO satellite antenna with duplexer in the handle. Sometimes, I operate full duplex (two radios) and bypass the duplexer by attaching my own cables to the separate parts of the antenna (1 radio for 2m, 1 radio for 70cm). In the course of rushing to catch a satellite pass, I mixed up my connections and accidentally transmitted (5 watts) into one of the arrow antenna cables, causing RF to feed backwards into the duplexer. Recently, I have noticed decreased performance (poor reception, lower S/N, even on AO-51 when in the past it was full quieting) and am trying to ascertain if it could have anything to do with my mistake of feeding RF in the wrong direction into the duplexer. Could my mistake cause this problem? Thanks, Tim KI6VBY ___ 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
