The Outsider's Inside Post #011 - Chapter and Verse


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Profile KevinDouglasPhD
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Message 540246 - Posted: 3 Apr 2007, 3:26:00 UTC

I almost didn't get around to writing a blog post this Monday. Good thing I had to come in and check on some jobs that were running. Not much happening; Matt's on holidays this week, so I managed to catch up to him on the SETHI spectrum-splitting task. The database now contains over 15 million spectra. Eric went over to the other building to see if we had a group meeting, and he said he'd call if there was one. He never called, but came back later and said there was no real meeting but they did talk about a lot of stuff anyway. So that sounds like a meeting to me. Anyway, after consulting with the gurus at Arecibo, it does appear that the spurious signals causing problems in the SETI@home multibeam application are due to radar, even though they don't have a totally regular periodicity. It must have something to do with a variable recovery time from when the receiver saturates.

My 108th SETHI datacube got made today, so that puts me at 75% complete. I also found some more bugs in the code that we use to process our GALFA data, so I expect my next set of datacubes for that project to look a lot better. We had some days way back in October & November of 2005 where the DAC levels were not set right, causing the spectrum to have too narrow a bandpass, so the signal at the outer frequencies of our science band were too high. Here's an example of what I'm talking about (plus a nasty RFI spike to boot):


Anyway, we want to blank out the days where this happens, but the code to generate "blank" time epochs had some problems, which I fixed today. I expected my new cube to be ready when I got in this evening after watching hockey, but it's still got 6 hours to go! So I guess I will have to wait until tomorrow to see the improvement.

Arecibo is definitely stopping observations starting next week. They are going to take ALFA right down from the platform while they repaint the apparatus. I'll see if any of my colleagues at the observatory can take some pictures of the maintenance during the outage.

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Message 541522 - Posted: 5 Apr 2007, 23:47:59 UTC - in response to Message 540246.

I almost didn't get around to writing a blog post this Monday. Good thing I had to come in and check on some jobs that were running. Not much happening; Matt's on holidays this week, so I managed to catch up to him on the SETHI spectrum-splitting task. The database now contains over 15 million spectra. Eric went over to the other building to see if we had a group meeting, and he said he'd call if there was one. He never called, but came back later and said there was no real meeting but they did talk about a lot of stuff anyway. So that sounds like a meeting to me. Anyway, after consulting with the gurus at Arecibo, it does appear that the spurious signals causing problems in the SETI@home multibeam application are due to radar, even though they don't have a totally regular periodicity. It must have something to do with a variable recovery time from when the receiver saturates.

My 108th SETHI datacube got made today, so that puts me at 75% complete. I also found some more bugs in the code that we use to process our GALFA data, so I expect my next set of datacubes for that project to look a lot better. We had some days way back in October & November of 2005 where the DAC levels were not set right, causing the spectrum to have too narrow a bandpass, so the signal at the outer frequencies of our science band were too high. Here's an example of what I'm talking about (plus a nasty RFI spike to boot):


Anyway, we want to blank out the days where this happens, but the code to generate "blank" time epochs had some problems, which I fixed today. I expected my new cube to be ready when I got in this evening after watching hockey, but it's still got 6 hours to go! So I guess I will have to wait until tomorrow to see the improvement.

Arecibo is definitely stopping observations starting next week. They are going to take ALFA right down from the platform while they repaint the apparatus. I'll see if any of my colleagues at the observatory can take some pictures of the maintenance during the outage.


Thanks for the News Kevin . . . omg!!! (arEcibo goin' down . . .) ;)
> hopE you'rE wEll . . .

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Message 541549 - Posted: 6 Apr 2007, 0:55:49 UTC - in response to Message 541522.

Thanks for the News Kevin . . . omg!!! (arEcibo goin' down . . .) ;)
> hopE you'rE wEll . . .


I'm great, thanks. I was in Sacramento all day for a field trip with my son's class. I just came in to check on things and I see that my 111th SETHI cube finished earlier today, and #112 will be done in about 20 minutes. 7/9 of the way done! Mmmm, 7 of 9....(ok, that was geeky; I never used to watch Star Trek).

The Arecibo shutdown got moved a week to April 15, but ALFA will be taken down from the receiver platform a few days earlier. So a few more nights to collect some SETI@home & GALFA data. I wasn't expecting this extension, so I planned a little vacation starting Saturday. Just going to Southern California for a few days. Then when I get back I'll take care of this new Arecibo data. Might not start a new blog until midweek next week, but given the small amount of responses I'm sure it won't be missed.

Big games tonight: Calgary vs. San Jose & Colorado vs. Vancouver. If Calgary wins or Colorado loses, the Flames are in the playoffs. I'm going to have to cheer for my Canadian teams this evening.

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Message 541655 - Posted: 6 Apr 2007, 4:29:16 UTC - in response to Message 541549.

Thanks for the News Kevin . . . omg!!! (arEcibo goin' down . . .) ;)
> hopE you'rE wEll . . .


I'm great, thanks. I was in Sacramento all day for a field trip with my son's class. I just came in to check on things and I see that my 111th SETHI cube finished earlier today, and #112 will be done in about 20 minutes. 7/9 of the way done! Mmmm, 7 of 9....(ok, that was geeky; I never used to watch Star Trek).

The Arecibo shutdown got moved a week to April 15, but ALFA will be taken down from the receiver platform a few days earlier. So a few more nights to collect some SETI@home & GALFA data. I wasn't expecting this extension, so I planned a little vacation starting Saturday. Just going to Southern California for a few days. Then when I get back I'll take care of this new Arecibo data. Might not start a new blog until midweek next week, but given the small amount of responses I'm sure it won't be missed.


say 'ello ta eveybody there for mi - mi ol' home (i miss 'er) ;)

Ps - glad you're gettin' more work done Sir! Have fun with the vacation too . . .


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Message 542285 - Posted: 7 Apr 2007, 15:37:56 UTC

Dr. Kevin Douglas, Postdoctoral research associate
Born in the town of Penticton , in the Okanagan Valley , British Columbia , Canada

Kevin is a radio astronomer, specializing in the study of the interstellar medium.
He is an expert at observing Galactic hydrogen with the Arecibo multibeam receiver called ALFA,
to which SETI@home recently installed its new data recorder.

Hi Kevin

if I had a dream come true ... it would be:
Let's put up a whopping huge radio Telescope
solar powered on the far side of the moon
so Earth's communications , would not interfere
make it automated
turn it on and let's do some radio astronomy :-)


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Message 542345 - Posted: 7 Apr 2007, 18:15:55 UTC - in response to Message 542285.

Let's put up a whopping huge radio Telescope
solar powered on the far side of the moon
so Earth's communications , would not interfere
make it automated
turn it on and let's do some radio astronomy :-)

You’d also need an orbiter to relay data from it—failiing that, frequent trips to the site would have to be made.

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Message 542346 - Posted: 7 Apr 2007, 18:28:45 UTC

I would guess that there is quite a bit of Alfa data for the end-users to crunch now, even though some has been processed during the Beta phase. The questions are, How much longer will Alfa data be in Beta phase trials and how long will the Alfa receiver not be collecting data because of the refurbishment/repainting of the Alfa receiver interface at Arecibo?
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Message 542438 - Posted: 7 Apr 2007, 21:21:49 UTC - in response to Message 542345.

Let's put up a whopping huge radio Telescope
solar powered on the far side of the moon
so Earth's communications , would not interfere
make it automated
turn it on and let's do some radio astronomy :-)

You’d also need an orbiter to relay data from it—failiing that, frequent trips to the site would have to be made.

Naw, just enough cable to go about 1/4 way 'round the moon, and a relay to go on the end of the cable.
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Message 542691 - Posted: 8 Apr 2007, 14:28:52 UTC - in response to Message 542285.
Last modified: 8 Apr 2007, 15:21:41 UTC


@ Byron - Thank You Kindly . . . so - *WHEN* i succeed @ what i am presently succeedin' with - in due respect to mi case files @ Congressional Inquiry Level - i hereby announce that

"i shall insure that Byron's / Kevin's & Berkeley's Dreams are met with the Appropriate Monies - which i shall see to . . ."
- and the *likelyhood* of my succedding is already 'set in stone' per se - since 2 Federal Appeals Justices agree with a
FULLY FAVORABLE
in their Decision in which THEY Agree with the Attorney / Representative for the Claimant - in which I, Richard W lubrich Jr - Represent the Claimant - both and the same - being myself (7 long Years of Law Research) . . . I personally look forward to this lifelong Search for ETI / SETI & CETI . . . and to be able to Support this endeavor is such an honour and a priviledge - that makes being here - ALL worth the while . . . see you all there . . . in the very *near future* . . .



Dr. Kevin Douglas, Postdoctoral research associate
Born in the town of Penticton , in the Okanagan Valley , British Columbia , Canada

Kevin is a radio astronomer, specializing in the study of the interstellar medium.
He is an expert at observing Galactic hydrogen with the Arecibo multibeam receiver called ALFA,
to which SETI@home recently installed its new data recorder.

Hi Kevin

if I had a dream come true ... it would be:
Let's put up a whopping huge radio Telescope
solar powered on the far side of the moon
so Earth's communications , would not interfere
make it automated
turn it on and let's do some radio astronomy :-)




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Message 542877 - Posted: 8 Apr 2007, 21:34:20 UTC - in response to Message 540246.

I also found some more bugs in the code that we use to process our GALFA data, so I expect my next set of datacubes for that project to look a lot better. We had some days way back in October & November of 2005 where the DAC levels were not set right, causing the spectrum to have too narrow a bandpass, so the signal at the outer frequencies of our science band were too high.

Does this mean that earlier data gathered is wrong or invalid in some way? What information will you have in the new data that is not available from the old data (essentially, what's the difference)?


Arecibo is definitely stopping observations starting next week. They are going to take ALFA right down from the platform while they repaint the apparatus. I'll see if any of my colleagues at the observatory can take some pictures of the maintenance during the outage.

Can't wait to see the photos (I'm assuming that they will be uploaded somewhere!)
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