An amazing AO-7 QSO last week, Brazil to Belgium
Brazil to Belgium. Hey Tim, N3TL, you have been doing some of this type of planning with great success. What is the longest QSO you have achieved? What tools are you using for planning on the low passes? Your efforts are fascinating and we would like to know more.
http://www.southgatearc.org/news/june2009/ao7_brazil_belgium_contact.htm
Mark Lunday
WD4ELG
mailto:wd4elg@arrl.net wd4elg@arrl.net
"Back in the day" (late 70's / early 80's) W1JR and I were both active on AO-7 Mode B from FN42hn. I believe he had two one-way QSOs with KH6 but never completed a QSO. Once he was heard, once he heard the other station. In those days, you had plastic cut-outs which you overlapped on a piece of paper to see when the windows would intersect. I think the two were tangential, so there was only a very tiny window during which a QSO was possible.
73 - Jim AD1C
On Mon, Jun 15, 2009 at 6:38 AM, Mark Lundaymlunday@nc.rr.com wrote:
Brazil to Belgium. Hey Tim, N3TL, you have been doing some of this type of planning with great success. What is the longest QSO you have achieved? What tools are you using for planning on the low passes? Your efforts are fascinating and we would like to know more.
http://www.southgatearc.org/news/june2009/ao7_brazil_belgium_contact.htm
Hey Jim,
I can't begin to imagine how much computer software has impacted the predictability of possible openings.
Hawaii from here at EM84ha is possible, and I have heard myself on the Mode B downlink (in CW) at times during which KH6 was in the footprint.
It appears, however, that there is only one operator on any of the islands who is capable of working AO-7, and he is topographically challenged at azimuth positions that would work for a low-angle contact between our stations. To get below 4 degrees elevation, he tells me he need an azimuth position fomr his location of about 10 degrees - and that won't work for me here.
An all-mode radio like an IC-7000 or FT-857D with an Elk, hand-held would make the trip, although an operator over there would need a second radio for receive. Maybe some day, someone will make a trip to the big island of Hawaii and operate portable from a good elevation. That's my best hope for Hawaii.
73 to all,
Tim - N3TL -------------- Original message from Jim Reisert AD1C jjreisert@alum.mit.edu: --------------
"Back in the day" (late 70's / early 80's) W1JR and I were both active on AO-7 Mode B from FN42hn. I believe he had two one-way QSOs with KH6 but never completed a QSO. Once he was heard, once he heard the other station. In those days, you had plastic cut-outs which you overlapped on a piece of paper to see when the windows would intersect. I think the two were tangential, so there was only a very tiny window during which a QSO was possible.
73 - Jim AD1C
On Mon, Jun 15, 2009 at 6:38 AM, Mark Lunday wrote:
Brazil to Belgium. Hey Tim, N3TL, you have been doing some of this type of planning with great success. What is the longest QSO you have achieved? What tools are you using for planning on the low passes? Your efforts are fascinating and we would like to know more.
http://www.southgatearc.org/news/june2009/ao7_brazil_belgium_contact.htm
-- Jim Reisert AD1C/Ø, , http://www.ad1c.us
Sent via AMSAT-BB@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
Hey Mark,
Well, you know, I hadn't bothered to check the point-to-point distances for any of the European contacts, the African (Canary Islands) contact or my contact with AL1F in western Alaska. I have now, and I'm surprised by what I discovered.
Specifically, DJ8NY and I have worked twice, both times in CW, on early morning passes of AO-7 coming from my north-northeast. Based on the coordinates I found for the address shown on the hamcall.net Web site (he is not listed on QRZ.com), and based on the "Miles Per Watt Calculator" on the Web site of the QRP Amateur Radio Club International (QRP-ARCI), I learned that each of our contacts covered approximately 7,124 km or 4,427 miles. I hadn't expected to be that close to the Brazil-to-Belgium contact, so that was a pleasant surprise.
FYI - In using the Miles Per Watt Calculator, I entered the six-digit grid locators for each station (EM84ha for N3TL and JO31ub for DJ8NY), then left the "wattage" set at one so I would get the actual distance between the two locations.
Now ... I'd like to offer a few paragraphs about the extensive planning and calculating I did to enable the contacts - but that would be as humorous as it would be false. All I did was use the "Simulation" mode in Orbitron to see what part of Europe would be in the footprint of our Grand Old Girl on these low-angle passes to my north-northeast. Same with Alaska, albeit for evening passes to my north-northwest.
When passes gave me a good "look" to Europe, I simply started calling CQ in CW.
I had been trying to work Alaska for months, with regular emails between AL1F, KL7XJ and me. We got close more than a few times, but no log entry. I was thrilled to work Joe, AL1F, on consecutive passes of AO-7 to get Alaska in the log here.
I believe strongly that the key to all of these contacts was my addition of computer-controlled Doppler tuning because it freed me up to concentrate on my 3-part az/el antenna system (i.e., shoulder, elbow and wrist ... hihi). Seriously, my ability to focus specifically on where and how I was pointing the ol' Elk made the difference for me in making those contacts. I watched the az/el numbers on SatPC 32 as a pass unfolded, and did my level best to be dead-on with them.
73 to all,
Tim - N3TL -------------- Original message from "Mark Lunday" mlunday@nc.rr.com: --------------
Brazil to Belgium. Hey Tim, N3TL, you have been doing some of this type of planning with great success. What is the longest QSO you have achieved? What tools are you using for planning on the low passes? Your efforts are fascinating and we would like to know more.
http://www.southgatearc.org/news/june2009/ao7_brazil_belgium_contact.htm
Mark Lunday
WD4ELG
wd4elg@arrl.net
Sent via AMSAT-BB@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
participants (3)
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Jim Reisert AD1C -
Mark Lunday -
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