Re: New proportional counter for gamma radiation

#1303

As I recall the problem with measuring the solar muons, is the reason one needs two detectors in coincidence to get vertical muons. Otherwise most of what we measure is local radioactivity.
Thanks for the link to the other forum.?

Re: New proportional counter for gamma radiation

#1302

Thanks Tony for posting this - most interesting.

Cosmic rays are mostly the nuclei of Hydrogen and Helium, they are detected at ground level as muons with an average energy of around 6MeV.? The Radiacode 102 Radiation detector has a max energy sensitivity of 3MeV, so unsuitable for muon detection.? I'm not a Physicist and will be happy to be corrected.

There is a coloration between solar activity and cosmic radiation as demonstrated by Mark Prescot's data presented on the muon forum [/g/muondetector/messages].

--

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

Re: New proportional counter for gamma radiation

#1301

Hi Charley

That's an interesting question. I believe most cosmic rays that we see on Earth are not from the sun. Radiation?from the sun tends to just ionise the?top layers of the atmosphere.

However, I did a search and found this web site which shows a strong correlation with solar activity:

.

Tony

Show quoted text

On Fri, 10 Nov 2023 at 13:47, Charles Hill <chillmf20@...> wrote:

Tony,

Please excuse my taking the lazy way out instead of doing my homework.

Is it feasible?to use this detector to monitor and measure Solar Flares?

Regards,

Charley

On Fri, Nov 10, 2023 at 5:13?AM Tony Abbey <tabbey01@...> wrote:
Hi folks

I know several of you will have built the BAA radiation counter that we have talked about on this channel although I have never got much proportional response out of mine.
I have just seen an advert for a portable proportional counter which looks like a fantastic christmas present for €259 - expensive, but it looks very clever, and the website links to some great videos on background subtraction and calibration.

Re: New proportional counter for gamma radiation

#1300

Tony,

Please excuse my taking the lazy way out instead of doing my homework.

Is it feasible?to use this detector to monitor and measure Solar Flares?

Regards,

Charley

Show quoted text

On Fri, Nov 10, 2023 at 5:13?AM Tony Abbey <tabbey01@...> wrote:

Hi folks

I know several of you will have built the BAA radiation counter that we have talked about on this channel although I have never got much proportional response out of mine.
I have just seen an advert for a portable proportional counter which looks like a fantastic christmas present for €259 - expensive, but it looks very clever, and the website links to some great videos on background subtraction and calibration.

Re: Next RAZoom Mon. 13th Nov 19:30 - Dark matter + Search for the H-1

#1299

The Zoom link had been sent out.? If you haven't received it, or if you want to be added to the distribution list please contact me.

?

Monday Nov. 13th

^?

^{19:30 GMT (19:30 UTC)}

?

Prof. Sean Paling

STFC UKRI .

?

Andrew Thornett

?

Deep Science at Boulby Underground Laboratory

The search for Dark Matter and Beyond.

?

Recent endeavours for the search for the H-1 line

?

--

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

New proportional counter for gamma radiation

#1298

Hi folks

I know several of you will have built the BAA radiation counter that we have talked about on this channel although I have never got much proportional response out of mine.
I have just seen an advert for a portable proportional counter which looks like a fantastic christmas present for €259 - expensive, but it looks very clever, and the website links to some great videos on background subtraction and calibration.

https://www.radiacode.com/

Re: History of Jodrell Bank

#1297

开云体育

Glad you enjoyed the talk.

?

I think that the financial problems did make Sir B. more wary in the future,

as the Mark IV telescope was never built and the Mark V was abandoned when the SRC wouldn't finance it.

Mind you that led to the Merlin array, so wasn't a disaster in the end.

?

Mark

Re: History of Jodrell Bank

#1296

Hi Mark

Just watched the video. Thank you for a great presentation. It's amazing how much science was done there. Bernard Lovell must have been a very determined chap to keep pushing back the boundaries and ignore the financial problems.

Tony

Re: History of Jodrell Bank

#1295

开云体育

Sorry that the link I gave for my talk needed a password - I wasn't given one,

but they have now put the talk on YouTube here:-

?

https://www.youtube.com/watch?v=Mvdyeyp9nnM&list=PLneu_td-VMV_utMgvGZXKvoxsE0Vo7426&index=15

?

I waffled on for too long so my audio disappears for the last minute as the batteries in the radio mic died!

Hopefully you'll find it interesting as I show a lot of pictures that people probably haven't seen before.

?

Cheers,

?

Mark

Re: H-line dish and feed

#1294

My 3 metre solid dish is almost large enough to limit diffraction losses at 21cm, and gave reasonable results when I tried some quick tests last year, but steering that beast needs a lot of serious engineering, and it really needs to be bigger! One of my friends has a 4.5m solid dish and another has a 5.6m mesh dish. Those would be excellent RA tools, but they are used for moonbounce at 23cm.  Booo!

HOWEVER.... Any antenna is better than not trying. Mesh dish kits are available from RF Hamdesign in the Netherlands, and 1.2m offset parabolic satellite dishes are readily available. Steering gets more challenging from an engineering perspective with size at about the cube of the diameter!

Another option to consider is an array of small dipole/reflector antennas feeding individual SDR receivers using a common local oscillator clock, then processing the resulting data streams to create a synthetic steerable phased array. 

I've tried with a 90cm dish and a simple round "coffee can" feedhorn but the feed is huge and unwieldy on that little dish mount.

A set of four phased Yagis or loop yagis works OK for moonbounce at 23cm, and is fairly easy to build in a home workshop. Loop yagis are particularly simple to build.

Anyway, the point is to try SOMETHING, and see what results you can get, then when (not if) you get hooked and start measuring thermal noise from the moon and doing detailed 21cm mapping and all that good stuff, you can blame me for your garden becoming Jodrell.

One if my chums is selling a 2.4 metre mesh dish and some feeds. If anyone is interested, I can put you in touch. Location is Harrogate, North Yorkshire.

Neil

Re: H-line dish and feed

#1293

Surely the important point is that it is a 65cm dish. This is very small for H-line, around 3 wavelengths. Before buying I would read the articles "Hydrogen line observations: from frugal to advanced" on the Astropeiler website??(edit the url for parts 1-3). This gives an idea of the resolution that can be expected from a dish of this size compared to other solutions. Personally I have used a corner reflector as being easy to make and giving a better performance than very small dishes (due to good sidelobe performance so there is lower noise pickup). I also have a mesh dish wifi antenna that was going to expand to a 90cm diameter and fit with a dipole + reflector feed. In theory that will be better than both the above options with lower wing resistance so easier mounting.

A8302 board

#1292

开云体育

Hi All,

See

Probably won’t work!!!

My plans now are to:

(i)?????????????? Complete hydrogen map and rotation curve of Milky Way with my current setup – as it is working – nothing more exciting that creating your own map of Milky Way with your own hands!!

(ii)????????????? Then, I would like to obtain my own interferometry fringes (using my Ptarmigan array and Nooelec 1420MHz mesh antenna) and set up a competitor to the Very Long Baseline Array in Lichfield! (Last bit is a joke obviously…)

(iii)??????????? In the meantime, I also intend to:

(iv)??????????? Meteor observations are already online at RMOB – ensure that keeps working.

(v)????????????? I want to get my SID data to load up to my website – having problems at moment – Jim Sky is helping me (thanks Jim!) – I am waiting for Jim to come back on latest log files I have sent him = however, I suspect my issue is that my website provider (IONOS) requires too much security to FTP the files onto it. I am going to try and set up free website provider and see if that works.

(vi)??????????? I also want to set up my Radio Jove again and see if I can actually detect Jupiter this time.

(vii)?????????? Also, set up INSPIRE again…

(viii)????????? I would like to try and download weather data from a satellite.

(ix)???????????? Organize and run workshop for my astronomy group on radio astronomy.

(x)????????????? Attend BAA RAG sessions online.

(xi)???????????? Let me know anything else I’ve missed!

Andy

Testing Noolec 1420MHz mesh antenna 4/11/23

#1291

开云体育

Please see for results of my tests today on this aerial.

Andy

Re: H-line dish and feed

#1290

开云体育

Clearly I misread the website – my apologies!

Andy

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Tony Abbey via groups.io
Sent: 04 November 2023 07:29
To: [email protected]
Subject: Re: [baa-rag] H-line dish and feed

?

Not sure where you got that price - perhaps how much they have raised so far. It's $175 for a dish and H-line feed.

Tony?

Re: H-line dish and feed

#1289

Not sure where you got that price - perhaps how much they have raised so far. It's $175 for a dish and H-line feed.

Tony?

Re: H-line dish and feed

#1288

开云体育

Forgive my ignorance, but what does this discovery dish at $8000 each offer that a much cheaper satellite dish or cantenna does not for hydrogen line astronomy? I realise I should know the answer to that question but I am still lacking lot of knowledge in many things radio astronomy.

Andy

Sent from

Show quoted text

From: [email protected] <[email protected]> on behalf of Charles Hill via groups.io <chillmf20@...>
Sent: Friday, November 3, 2023 4:35:20 PM
To: [email protected] <[email protected]>
Cc: Jim Reagan <jimreagans@...>
Subject: Re: [baa-rag] H-line dish and feed

?

Tony Abbey???

9:48?AM (1 hour ago)

to?baa-rag

I see that this Kickstarter project is ready to go. It looks like a pretty simple way to get going for people that don't go skip-diving like I do!

Tony,

Thanks for sharing.

Regards,

Charley

On Fri, Nov 3, 2023 at 9:48?AM Tony Abbey <tabbey01@...> wrote:

I see that this Kickstarter project is ready to go. It looks like a pretty simple way to get going for people that don't go skip-diving like I do!

Tony

Re: H-line dish and feed

#1287

Tony Abbey???

9:48?AM (1 hour ago)

to?baa-rag

I see that this Kickstarter project is ready to go. It looks like a pretty simple way to get going for people that don't go skip-diving like I do!

Tony,

Thanks for sharing.

Regards,

Charley

Show quoted text

On Fri, Nov 3, 2023 at 9:48?AM Tony Abbey <tabbey01@...> wrote:

I see that this Kickstarter project is ready to go. It looks like a pretty simple way to get going for people that don't go skip-diving like I do!

Tony

H-line dish and feed

#1286

I see that this Kickstarter project is ready to go. It looks like a pretty simple way to get going for people that don't go skip-diving like I do!

Tony

Re: Next RAZoom Mon. 13th Nov 19:30 - Dark matter + Search for the H-1

#1285

开云体育

The link will be posted on Friday 10^th Nov.

?

--

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

Next RAZoom Mon. 13th Nov 19:30 - Dark matter + Search for the H-1

#1284

?

Monday Nov. 13th

^?

^{19:30 GMT (19:30 UTC)}

?

?
Prof. Sean Paling

STFC UKRI .

?

Andrew Thornett

?

Deep Science at Boulby Underground Laboratory

The search for Dark Matter and Beyond.

?

Recent endeavours for the search for the H-1 line

?

If you are not on the distribution list please contact me and I can add you.

--

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???