Anyone doing hydrogen line observing?

[gabrielxp46]

Hello, my name is Gabriel and I'm from Brazil. I would like to build a project to detect hydrogen line with SDR dongle, what materials do I need like LNA, band filters? You said you used line amplifiers, what is their model? What is the order of assembly of the equipment? When I set up my project, could you help me collect and analyze the data?

[gabrielxp46]

Hello, my name is Gabriel and I'm from Brazil. I would like to build a project to detect hydrogen line with SDR dongle, what materials do I need like LNA, band filters? You said you used line amplifiers, what is their model? What is the order of assembly of the equipment? When I set up my project, could you help me collect and analyze the data?

[gabrielxp46]

Could you tell me what equipment you need to set up a radio telescope? From what I saw in your project I just don't intend to use raspberry pi.

[gabrielxp46]

On 04/03/2019 at 19:31, Coto said:

Alright, so the engineers built the feed for me:

Might not be a factory-level construction, but I'm very happy for just €35 (he told me the next one would cost €60 because it came out harder than he thought haha).

 

Question: Is it ok if I give it a good white paint (after a layer of primer paint)? I don't think I'll have any problem with reflectivity or something?

Where did you get this equipment built?

[gabrielxp46]

What is the material used to build the feedhorn? Aluminum?

[gabrielxp46]

Where can I find the correct feedhorn dimensions I need? I know the dimensions depend on the size of the antenna I will use. What dimensions of the feedhorn, for example, for a 1.5m dish?

[gabrielxp46]

Where can I find the correct feedhorn dimensions I need? I know the dimensions depend on the size of the antenna I will use. What dimensions of the feedhorn, for example, for a 1.5m dish?

[gabrielxp46]

What is the specimen material inside the feedhorn?

[Coto]

@gabrielxp46 First of all, no need to create a thousand posts. If you want to add something, you can edit your post. I will start writing a PDF with information regarding building a radio telescope and share it on my radio astronomy community forum soon: https://community.pictortelescope.com/ (I just created it, so not a lot of activity to see). I am definitely more active there and receive notifications, so I would encourage you to post these sorts of questions there as I will be able to respond quicker.

 

The feedhorn is galvanized steel, but any conductive metal will work (the more conductive it is, the better). I made my next horn antenna from aluminum (I got it custom designed by an engineering machine shop). Dimensions can be found here: https://github.com/0xCoto/PICTOR

[Carl Reade]

Have a read through the thread there are lots of links and diagrams to get you started.

Carl

[Newboy]

I am just getting interested in radio astronomy.  I have an amateur radio background and we have cloud cover here most days and nights so it seems a good idea.  I am just starting to collect information and the gear I need and find out how it all works.

This discussion is just what I need, it is informative and also it is encouraging me to have a go.  I will have a look at the Pictor site too.

Thanks everyone!

Frank

[Kaffeedor]

Hello everyone!

@Carl Reade

How did you attach the 'Sides' of the bi quad, to the main Plate? 

Did you bend it, or did you glue it, (if yes, with what did you glue it?).? 

Bcs I can't find any Conductive Glue for Metall! 

Greetings from Austria 

Fedor (aka. Kaffeedor) 

[Carl Reade]

22 hours ago, Kaffeedor said:

Hello everyone!

@Carl Reade

How did you attach the 'Sides' of the bi quad, to the main Plate? 

Did you bend it, or did you glue it, (if yes, with what did you glue it?).? 

Bcs I can't find any Conductive Glue for Metall! 

Greetings from Austria 

Fedor (aka. Kaffeedor) 

Hi Fedor basically I had to cut a hole in the centre of the plate and screw a small price of copper circuit board to a female N connector. So the screws go through the plate and N connector. The. I soldered a small price f hard coax to the copper plate using the correct spacing from the plate. Then I soldered the "bow to the coax. The top middle of the bow to the centre core and the bottom centre to the outer coax. As I used hard coax its outer is like copper tube and was enough to support the bow. It is far easier if you can get a piece of copper plate and solder a small copper pipe to it and then you just feed coax though it. The second pic is an easier way. I would also mention that you need to solder with a blowtorch to get enough heat and plumbing solder. Hope this makes sense. Carl.

 

[Kaffeedor]

Oh sorry I meant this:

@Carl Reade

Edited December 19, 2019 by Kaffeedor

[Carl Reade]

14 hours ago, Kaffeedor said:

Oh sorry I meant this:

@Carl Reade

Ahh it is thin so was able to bend it into shape.

On 17/12/2019 at 18:01, Kaffeedor said:

Hello everyone!

@Carl Reade

How did you attach the 'Sides' of the bi quad, to the main Plate? 

Did you bend it, or did you glue it, (if yes, with what did you glue it?).? 

Bcs I can't find any Conductive Glue for Metall! 

Greetings from Austria 

Fedor (aka. Kaffeedor)

 

[UR8IP]

Привет из Украины.
Вот мой самодельный 1420 МГц LNA

1420 MHz irradiator

Edited January 8, 2020 by UR8IP

[Carl Reade]

Looks like you will be up and running soon. What size of dish are you using?

Carl

[UR8IP]

Good afternoon.
Diameter inside 175mm. Height of the sides 50mm.

[Kaffeedor]

Hello everyone! 

@Carl Reade

Does this ⬇️ (on the bi quad feed) need to be exactly 90° or can it be like that? 

 

 

Thanks in Advance, 

Fedor

[UR8IP]

Buy an aluminum pan of a suitable size, cut to a height of 50 mm. In the center, install the plug.

[Kaffeedor]

41 minutes ago, UR8IP said:

Buy an aluminum pan of a suitable size, cut to a height of 50 mm. In the center, install the plug.

Hello @UR8IP, 

Why does it need to be aluminum? 

Since Copper is more conductive!

And does it need to be exactly 90° or can it be less?! 

 

Edited January 11, 2020 by Kaffeedor

[Carl Reade]

3 hours ago, Kaffeedor said:

Hello everyone! 

@Carl Reade

Does this ⬇️ (on the bi quad feed) need to be exactly 90° or can it be like that? 

 

 

Thanks in Advance, 

Fedor

As long as the sides are 90 deg to eachother I'm sure you can have a small curve.

[UR8IP]

You should not install such expensive metal as a reflector. Copper is corroded. You can successfully apply a grid with a small cell. But in any case, you will need a device to adjust the irradiator.

[Kaffeedor]

On 12/01/2020 at 10:19, UR8IP said:

You should not install such expensive metal as a reflector. Copper is corroded. You can successfully apply a grid with a small cell. But in any case, you will need a device to adjust the irradiator.

@UR8IP Wdym? 

It is the feed, not the "Reflector" /dish?! 

And it wasn't that expensive. 

And for the Original question, I asked, I managed to bend it 90° with professional help, so this shouldn't be a Problem. 

[Carl Reade]

It will work fine. I think what UR is saying is the plate on the feed is a reflector which it is but not the main reflector.

Copper will need sprayed with a coating to protect it from the weather. Keep us updated on the build.👍