Very excited - successfully mapping Perseus arm of Milky Way!

[andrew....@googlemail.com]

I am very excited – the attached image demonstrates I am successfully mapping the Perseus Arm of the Milky Way with my Ptarmigan Array and SDR – data collected and analyzed with Ted Cline’s marvelous ezRA suite and overlaid with Milky Way map.

Andy

[Captain Anne Flint]

Well, it looks wonderful. Congratulations! Wende 

On Nov 1, 2023, at 8:38 AM, andrew.thornett via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:

I am very excited – the attached image demonstrates I am successfully mapping the Perseus Arm of the Milky Way with my Ptarmigan Array and SDR – data collected and analyzed with Ted Cline’s marvelous ezRA suite and overlaid with Milky Way map.

Andy

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<Map of Milky Way overlaid on my data demonstrating that I am successfully mapping Perseus arm 011123.jpg>

[Andrew Thornett]

Thanks Wende. Given how much of an idiot I am when it comes to radio stuff, it is a miracle!!! Would not be possible without the amazing gift of this array from Andy Thomas, and Ted Cline's spectacular ezRA Python scripts, and wonderful support from this group and SARA!

Must give them all the credit - I feel these plots are as much their's as mine!

......Oooh and the SAWBird H+ which has revolutionised hydrogen line radio astronomy for beginners like me.

Andy

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From: sara...@googlegroups.com <sara...@googlegroups.com> on behalf of Captain Anne Flint <bera...@gmail.com>
Sent: Wednesday, November 1, 2023 4:11:41 PM
To: sara...@googlegroups.com <sara...@googlegroups.com>
Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

 

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[Dr. Rich Russel]

Andrew,

Consider putting this in the SARA journal as an observation report.

I'll need it by Dec 12, so you have lots of time.

Great work!

Rich

To view this discussion on the web visit https://groups.google.com/d/msgid/sara-list/CWXP123MB3653670EDCBCBD7437BBE932FFA7A%40CWXP123MB3653.GBRP123.PROD.OUTLOOK.COM.

[Andrew Thornett]

Hi Rich

I've only just joined SARA - is there a way of accessing old journals so I can see how these reports are written/ideal length etc?

Andy 

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Sent: Thursday, November 2, 2023 12:40:42 AM

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[Alex P]

Andrew,

 Do you have any SDR#  IF_Average data files acquired with the new nooelec 1.42 GHz Antenna  posted on  your Website ?

FYI : changing the FFT resolution to 512 will provide a bit smoothing but not adversely degrade the resolution of your data.

( I use 512 )

Thanks,

Alex

[Andrew Thornett]

Not yet will let you know when I do

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From: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Thursday, November 2, 2023 9:26:46 AM
To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

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[Andrew Thornett]

Not yet will let you know when I do

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From: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Thursday, November 2, 2023 9:26:46 AM

To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

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[Alex P]

I'd like to compare your results w/ the new  nooelec 1.42G dish .

Ideally, point it towards the Meridian  @  + 40 deg Declination... one day's data set if fine.

( 13 degrees South of overhead from your location )

Coordinates of Lichfield in degrees and decimal minutes

Latitude: 52°40.8924′ N
Longitude: 1°49.5294′ W

Alex

On Thursday, November 2, 2023 at 6:01:06 AM UTC-4 Andrew Thornett wrote:

Not yet will let you know when I do

.

[b alex pettit jr]

                 Try this setup   

Should give you  360  saved files / sidereal day  = 1.00 degree change in RA per file

vs 1.64 deg with your current '902000'  averaging   ( 220 files  / SiDay )

( 0 Delay  :  start taking data as soon as one is saved )

[Andrew Thornett]

Thank you. What does intermediate average do? I notice you've changed that.

Andy

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From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Thursday, November 2, 2023 2:47:28 PM
To: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

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[b alex pettit jr]

It is a 'multiplier' for the Dynamic Avg slider scaling.

Alex

[Job Geheniau]

Hi

What is a  "Ptarmigan Array". Do you have pictures?

And what is "ezRA suite" download sites?

Job Geheniau

Op woensdag 1 november 2023 om 14:38:41 UTC+1 schreef andrew....@googlemail.com:

[andrew....@googlemail.com]

The array and details of its specs can be seen on my website www.astronomy.me.uk

ezRA suite is a suite of powerful Python scripts for radio astronomy – again its outputs can be seen on my website. ezRA stands for Easy Radio Astronomy.

Access to it is available free from Ted Cline of the Society of Radio Astronomers (SARA) in USA – if you email me on and...@thornett.net then I will forward you his contact details.

Andy

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[andrew....@googlemail.com]

Forgive me, Alex – I am none the wiser…….what does that mean in idiot’s language (I am an idiot)?

 

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: 02 November 2023 16:08
To: 'Andrew Thornett' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

 

It is a 'multiplier' for the Dynamic Avg slider scaling.

Alex

 

 

On Thursday, November 2, 2023 at 11:42:43 AM EDT, 'Andrew Thornett' via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:

 

 

Thank you. What does intermediate average do? I notice you've changed that.

Andy

 

Sent from Outlook for Android

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From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Thursday, November 2, 2023 2:47:28 PM
To: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

 

                 Try this setup   

Should give you  360  saved files / sidereal day  = 1.00 degree change in RA per file

 

vs 1.64 deg with your current '902000'  averaging   ( 220 files  / SiDay )

 

 

( 0 Delay  :  start taking data as soon as one is saved )

 

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Y

 

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[Facility 406]

On 11/2/2023 11:35, andrew.thornett via Society of Amateur Radio

Astronomers wrote:
> The array and details of its specs can be seen on my website

> www.astronomy.me.uk <http://www.astronomy.me.uk>

I can't count the number of those old commercial antennas I chucked when
working at comms sites on mountain tops. Essentially just a series of
corner reflector antennas. They look rugged, but that's compared to the
average consumer junk, they don't last more than a few seasons around here.

Common for TV translators in smaller communities, the last I saw was a
bank of them for channel 13, but too narrow for 220 MHz operation, and
too large to reasonably move with my truck, so I let the vandals take it
for scrap.

Nice that you got a good one, and the frequency range is adequate. Have
you swept it to the what the actual frequency range is?

Kurt

[b alex pettit jr]

 

Intermediate Avg = 1,         Dynamic Avg Slider  range =     1 -   50   thousand avgs

Intermediate Avg = 10,       Dynamic Avg Slider  range =    10  -  500 thousand avgs 

Intermediate Avg = 100,     Dynamic Avg Slider range  =  100 -   5 million avgs    

Intermediate Avg = 1000,   Dynamic Avg Slider range =  1000 -  50 million avgs                  

[andrew....@googlemail.com]

Thanks

 

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: 02 November 2023 19:18
To: andrew.thornett via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Very excited - successfully mapping Perseus arm of Milky Way!

 

 

Intermediate Avg = 1,         Dynamic Avg Slider  range =     1 -   50   thousand avgs

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[andrew....@googlemail.com]

Not yet

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[b alex pettit jr]

Here are plots from your 22 Oct '23 data set   

220 ( 24 hrs ) of plots overlayed.

The nooelec should perform much better ..

Large baseline drift in the raw data ..  and the Amplitude is low

Raw Data

Data Drift Normalized

FYI, this is my 1m Umbrella Antenna scaled to the same ranges as above ( not as many plots )

 Alex

[b alex pettit jr]

Andrew,

Try some tests Without the Gold LNA 

Connect the SAWBird to the LMR400 from the antenna.

Prior to the first gain stage ( LNA ) Every adapter / cable adds Noise.

Alex