Date   

Re: AO-51 PL Test ON

K6LCS <clintbrad4d@...>
 

Confirmed PL mode ON as of 4:15PM PDT.

Clint


AO-51 PL Test ON

K6LCS <clintbrad4d@...>
 

This evening I shut the 435.150 transmitter off and raised 435.300 to
near 2 watts output. Tomorrow morning I plan to turn on the new PL
routine. This improved routine will turn the downlink on with an
unsquelched uplink when it hears a 67 hz tone. I plan on leaving a tail
of several minutes, so the transmitter will stay on without hearing a
tone for an interval of several minutes.

What does this mean for the user? It would be helpful to program in a 67
hz PL tone again, but not absolutely required as long as someone else in
the footprint does. It also means if you are the first person in the
footprint (not very likely in North America, Europe, or Japan) you might
not hear the satellite until after it hears 67hz for a few seconds.

If all goes well, we'll continue this mode through the mode change
Sunday night. Reports from when the downlink turns on or off would be
appreciated.

73, Drew KO4MA
AMSAT-NA VP Operations


Re: HO-68 sched

K6LCS <clintbrad4d@...>
 

... HO-68 ... schedule seems confusing ...
That's one of the reasons why I don't really promote '68. Yes, I believe all the times are UTC / GMT.

Clint


HO-68 sched

fejohnso
 

Just noticed that HO-68 was about to pass over so I checked their site and it didn't appear that it was turned on for North America. On their schedule list, is the times listed UTC? Do the times listed for the date, ex-10Apr10 appear below the date and double lines or above the date? Seems confusing sometimes.


Re: Thoughts on adjusting for doppler on VHF Side?

K6LCS <clintbrad4d@...>
 

... engineering students like me .. thinking about figuring out at exactly what elevation the satellite is when to change between downlink frequencies ...
OK, now - although this IS rocket science, it really isn't. (grin)

Even with a very directional Yagi, you have quite a bit of "leeway" while working the FM satellites. I mean, it is not as if you're rigidly holding the antenna ... making minute movements every fifteen seconds ...

Do not over-think this. Just get outside and DO IT!

(Apologies to Nike.)

Clint


Re: Thoughts on adjusting for doppler on VHF Side?

Brian Barney <brian77223@...>
 

And then there are the engineering students like me who are used to doing calculations like that, and are sick enough to find them fun :-P

I'm thinking about figuring out at exactly what elevation the satellite is when to change between downlink frequencies. All I need for that is the velocity and altitude of the satellite, the rest is trigonometry.
Moving the frequencies around works well also, when the audio gets scratchy, try the next channel to see if it gets better.

Do the people that work the microwave frequencies have problems keeping the doppler shift under control? If we have to change 20khz during a pass at 440mhz, a pass with reception of 2.4ghz experiences a change of 120+khz per pass (assuming 8km/s orbital velocity)

Anywho, I think too much, I dont even have any microwave equipment (except for the large transmitter I use to warm up my food with)
'73

-Brian Barney

--- On Thu, 4/8/10, K6LCS <clintbrad4d@earthlink.net> wrote:

From: K6LCS <clintbrad4d@earthlink.net>
Subject: [Work-Sat] Re: Thoughts on adjusting for doppler on VHF Side?
To: Work-Sat@yahoogroups.com
Date: Thursday, April 8, 2010, 7:38 PM
Thanks Clint ...
Hey - that's why we're here!

During my presentation, the "Doppler effect" comes up. And
I tell the group, "Calculating it is easy. With your slide
rules, the equation is ...

"The transmitted frequency times the ratio of the rate of
change of distance versus time, divided by the speed of
light - equals your Doppler frequency."

And I pause ... and look around the room with a, "I told
you it was easy!" look. "Any questions?"

I wait for the chuckling to subside, then show 'em the
"results" slide.

Welcome to my world, Michael ... (grin)

Clint



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Re: Thoughts on adjusting for doppler on VHF Side?

K6LCS <clintbrad4d@...>
 

Thanks Clint ...
Hey - that's why we're here!

During my presentation, the "Doppler effect" comes up. And I tell the group, "Calculating it is easy. With your slide rules, the equation is ...

"The transmitted frequency times the ratio of the rate of change of distance versus time, divided by the speed of light - equals your Doppler frequency."

And I pause ... and look around the room with a, "I told you it was easy!" look. "Any questions?"

I wait for the chuckling to subside, then show 'em the "results" slide.

Welcome to my world, Michael ... (grin)

Clint


Re: Thoughts on adjusting for doppler on VHF Side?

MichaelE <k4moa@...>
 

Thanks Clint,

Once again you are a great source of knowledge. Thank you for starting this group and offering a good location to find information about FM Satellites.

Michael

--- In Work-Sat@yahoogroups.com, "K6LCS" <clintbrad4d@...> wrote:

I have done the math. On a decent pass of AO-51, there was almost a 10kHz change from acquisition to loss on the receive / 440 side.

But only about 3kHz on the uplink / 2 meter side.

And since we're mostly working the "middle" of passes with low power - I recommend NO Doppler correction for the 2M uplinks.

Now, then, if we work the passes horizon-to-horizon with 100W and computer-controlled Yagis, then I might compensate a little for Doppler on the 2M side of things.

I will post two slides from my presentation in the FILES area here: the actual equation to figure out the Doppler effect, and a chart showing the results I mentioned above.

Clint


Re: Lithium-Air Batteries Promising

K6LCS <clintbrad4d@...>
 

Lithium-air battery technology looks to have a big future ...
These are for our "land-based" projects ... since there's little "air / oxygen" in space.

(grin)

Clint


Re: Thoughts on adjusting for doppler on VHF Side?

K6LCS <clintbrad4d@...>
 

I have done the math. On a decent pass of AO-51, there was almost a 10kHz change from acquisition to loss on the receive / 440 side.

But only about 3kHz on the uplink / 2 meter side.

And since we're mostly working the "middle" of passes with low power - I recommend NO Doppler correction for the 2M uplinks.

Now, then, if we work the passes horizon-to-horizon with 100W and computer-controlled Yagis, then I might compensate a little for Doppler on the 2M side of things.

I will post two slides from my presentation in the FILES area here: the actual equation to figure out the Doppler effect, and a chart showing the results I mentioned above.

Clint


Thoughts on adjusting for doppler on VHF Side?

MichaelE <k4moa@...>
 

Hey everyone,

I was curious what the consensus was on adjusting for doppler on the VHF side of things? I have read many places that adjusting on the VHF side isn't necessary - but I would like to ask the group what they do.

In the past couple of weeks I have found several websites which suggest adjusting for doppler on VHF. In addition, I have been reading the ARRL Satellite book and the sample programming they list adjusts for doppler on the VHF as well. Finally, I also recently read an website about contacting the ISS on the VHF repeater that they adjusted for doppler as well (this page was off of the ISS Fanclub page).

I would just like to ask what the others here do?

Thanks,

Michael, K4MOA


Re: grid squares

chuck_sprick <ke5rad@...>
 

Clint, et.al.,

I received the response you posted from Bert directly and I certainly appreciate his position. I suspect he is correct, it is most likely a false alert from Norton for some obscure reason. See my response to him below.

The fact that we each can make our own choices concerning what we do is what makes the US of A such a wonderful place and why I spent 20 years wearing the Air Force blue uniform.

73,
Chuck
KE5RAD
++++++++++++++++++++++++++++++++++++++++++++++
I understand your frustration, Bert. As I said, I'm no big fan of Norton and have cussed them on various occasions over the years. When my current subscription expires, I'm switching to some other AV program. Only reason I keep using them is I like their e-mail scanner and I like to get my $$$ worth after laying out the bucks.

I don't work stations for any awards or contests, rather, I log just for the fun of it. I saw a link to your program and am always trying out new software and things, just to see how they work. For example, I spent last week setting up remote operation for my Kenwood TS-2000 using Skype and HRD. I have no reason to want to operate remotely, being retired and not traveling much and I probably won't use it more than once or twice, but I got it working so my curiosity bump no longer itches on that subject.

I'll do a bit of Googling when I get a little time and see if there is anything out there on false alerts with my version of Norton. Thanks for sharing what I'm sure is a nice amateur radio tool. That is what makes our hobby so special, the sharing attitude among Hams.

73,
Chuck
KE5RAD
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

--- In Work-Sat@yahoogroups.com, "K6LCS" <clintbrad4d@...> wrote:

A friend here using Norton anti-virus is running into a "trojan alert" when trying to install ...

http://ve2zaz.net/WorkedGrids/WorkedGrids.htm

The software author HAS heard of this before:

"It is unfortunate that they don't provide you with a trojan horse name. How in the world are you going to be able to resolve the issue if you don't know what virus might attack you... If you ever find out a way to extract the trojan horse the antivirus is complaining about, let me know. The executable was cleanly compiled in Delphi 3 (Object-Oriented Pascal) two years ago. My website is hosted by GoDaddy.com, one of the biggest in the world. And it resides on their Unix servers. No Windows trojans there!

"Please disregard this alert. Turn off the Antivirus, install the program, delete the installation executable and re-enable the Antivirus. There is absolutely nothing I can do at my end."

The software author IS a fellow ham. There ARE thousands of people using his program who are enjoying it. All I can say is that for me, personally, Norton has NEVER improved system efficiency or enjoyment when I was working under MS Windows for many years. But that's OLD news. And I know of a couple members here that ARE running Worded Grids with NOI problems whatsoever.

And so it goes ....

Clint Bradford


Re: grid squares

K6LCS <clintbrad4d@...>
 

A friend here using Norton anti-virus is running into a "trojan alert" when trying to install ...

http://ve2zaz.net/WorkedGrids/WorkedGrids.htm

The software author HAS heard of this before:

"It is unfortunate that they don't provide you with a trojan horse name. How in the world are you going to be able to resolve the issue if you don't know what virus might attack you... If you ever find out a way to extract the trojan horse the antivirus is complaining about, let me know. The executable was cleanly compiled in Delphi 3 (Object-Oriented Pascal) two years ago. My website is hosted by GoDaddy.com, one of the biggest in the world. And it resides on their Unix servers. No Windows trojans there!

"Please disregard this alert. Turn off the Antivirus, install the program, delete the installation executable and re-enable the Antivirus. There is absolutely nothing I can do at my end."

The software author IS a fellow ham. There ARE thousands of people using his program who are enjoying it. All I can say is that for me, personally, Norton has NEVER improved system efficiency or enjoyment when I was working under MS Windows for many years. But that's OLD news. And I know of a couple members here that ARE running Worded Grids with NOI problems whatsoever.

And so it goes ....

Clint Bradford


Satellite Demo/Presentation in Placentia, CA 04/13/10

K6LCS <clintbrad4d@...>
 

AMSAT area coordinator Clint Bradford, K6LCS, will be
presenting his "Working Amateur Satellites With Your HT"
multimedia session at the April 13, 2010 meeting of
the Placentia RACES organization. All are welcome to attend.

"Tentatively, we'll have a workable pass of AO-51 at
6:05PM that evening," Clint reports. If you would like to
show up early, Clint will be working the satellite from the
parking lot.

Tuesday, April 13, 2010
Placentia RACES meeting starts at 7PM
City of Placentia Police Department / City Hall Conference Room

Attendees should download Clint's four-page tutorial and radio
programming matrix before the meeting from ...

http://www.work-sat.com

And Clint welcomes pre-presentation questions - call him at
909-241-7666, or send email to clint@clintbradford.com


Our 100th Member!

K6LCS <clintbrad4d@...>
 

N6GOZ was our 100th subscriber to the Work-Sat YahooGroup!

Privately send me your mailing address, Mike, for your prize:

A laminated AMSAT Satellite Frequency Guide!

Clint, K6LCS


Re: grid squares

K6LCS <clintbrad4d@...>
 

I tried to download the install file for Worked Gridsquares ...
Thanks for the news. I, too, have written the author, Until you or I find out what's happening, I have deleted the other messages regarding this program.

Which still leaves us, apparently, looking for "grid squares worked" programs for Windows. Anyone have any suggestions???

Clint


Re: working satellites with a VX-8R

K6LCS <clintbrad4d@...>
 

And AO-51 is in "our" mode - V/U - right now!

If you're down here next week, I am giving my "Work Sats with Your HT" presentation for the Placentia RACES club on April 13 - all are invited!

Clint, K6LCS
909-241-7666

THANKS VERY MUCH FOR THE INFO, JUST GETTING INTO HAND HELD SAT WORK.


Lithium-Air Batteries Promising

K6LCS <clintbrad4d@...>
 

Lithium-air battery technology looks to have a big future. With the potential of providing energy densities up to three times that of the conventional lithium-ion batteries found in just about every portable consumer electronics device going around (not to mention the incoming wave of electric vehicles), many companies, including IBM and General Motors are pursuing work on lithium-air batteries. Now researchers at MIT have made a breakthrough that could help make the commercial development of lightweight rechargeable batteries a reality.

Interesting article at ...

http://tinyurl.com/li-air

Clint


Re: working satellites with a VX-8R

perryc <canoeman@...>
 

THANKS VERY MUCH FOR THE INFO, JUST GETTING INTO HAND HELD SAT WORK.
KE6ANM

--- In Work-Sat@yahoogroups.com, "K6LCS" <clintbrad4d@...> wrote:

Sure. Look at page 48 of the manual. Yaesu calls it "Odd Splits." The VX-8R - as are the VX-6R, VX-7R, and FT-60R - can transmit on 2M while receiving on 440 in one channel.

Use the same programming guide for the VX-8R as in the tutorial at ...

http://www.work-sat.com

Clint

--- In Work-Sat@yahoogroups.com, "perryc" <canoeman@> wrote:

any one have any luck working a sat with VX-8r and a dual band arrow antenna?
tried to watch vimeo video, but vimeo wont work for me.


Re: aluminum extension tripod radio cradle brackets for arrow antennas for sal

K6LCS <clintbrad4d@...>
 

I'd also like to see a photo of the extension ...
Here's mine ... quite secure ...

http://web.me.com/clintbradford/k6lcs/Photos/Photos.html

Clint

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