Re: Meteor echo of the day
Wow! That's an impressive capture.
Can you interpret anything from it?
Andy
Sent from
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Here’s a complex cluster of echoes received today of GB3MBA. This was captured on SDR-Console using an SDRplay RSPdx tuned to 50.408 MHz with a display window of +/- 100 Hz. The antenna is a Moxon horizontally polarised with 20 degrees elevation at ~2
m agl.?
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Re: Meteor echo of the day
Here’s a complex cluster of echoes received today of GB3MBA. This was captured on SDR-Console using an SDRplay RSPdx tuned to 50.408 MHz with a display window of +/- 100 Hz. The antenna is a Moxon horizontally polarised with 20 degrees elevation at ~2 m agl.?
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Re: Block diagram of 1420MHz H-Line Radio Telescope
Yes, ok for me -----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Andrew Thornett
via groups.io
Gesendet: Montag, 10. Februar 2025 20:48
An: [email protected]
Betreff: Re: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope
Hi Wolfgang,
How about this revised version?
Andy
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of messbetrieb via
groups.io
Sent: 10 February 2025 07:42
To: [email protected]
Subject: Re: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope
Hi Andrew,
I believe the missing piece here is the feed for the dish. You may have considered this as part of the dish but I think it is worth mentioning.
Wolfgang
-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Andrew
Thornett via groups.io
Gesendet: Sonntag, 9. Februar 2025 23:34
An: [email protected]
Betreff: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope
Hi All,
I have prepared this block diagram - so I thought I'd post it here in
case anyone
else would find it useful in their presentations etc. - please free to
use or publish
it as you wish.
Andy
|
Re: Block diagram of 1420MHz H-Line Radio Telescope
Hi Wolfgang,
How about this revised version?
Andy
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of messbetrieb via groups.io Sent: 10 February 2025 07:42 To: [email protected]Subject: Re: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope Hi Andrew, I believe the missing piece here is the feed for the dish. You may have considered this as part of the dish but I think it is worth mentioning. Wolfgang -----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Andrew
Thornett via groups.io
Gesendet: Sonntag, 9. Februar 2025 23:34
An: [email protected]
Betreff: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope
Hi All,
I have prepared this block diagram - so I thought I'd post it here in
case anyone else would find it useful in their presentations etc. - please free to
use or publish it as you wish.
Andy
|
Re: Dish for H-Line observations
Wolfgang's notes make an excellent
point about antenna gain/capture area.? A higher-gain "small" dish
(say 20 wavelengths diameter or better) will show some more detail
than a smaller one at around the diffraction minimum of 8
wavelengths, but if your target is a diffuse cloud with an angular
size than your antenna beam, the amount of signal power gathered
will be less than that from a smaller and wider dish.
Designing the antenna and feed for
minimum possible sidelobes is important where there are local
terrestrial noise sources.
The key point is that *building* and
*using* ANY antenna is better than doing nothing.??
Imagine building an Arecibo style drift
antenna on a frame on the ground using a coarse mesh. You could
make a huge dish that way without the engineering challenges of
making a self-supporting and steerable dish.
One of my friends has built a 4 metre
aluminium rib/mesh dish in his garage that puts a huge signal on
the Moon at 1.3 GHz, so it's entirely feasible to home-build that
sort of system for 21cm if you have enough determination.
--
Neil
On 10/02/2025 16:48, melvyn.jones via
groups.io wrote:
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Hi Paul
Be aware that 60cm is very small for H-Line work. You will see the local hydrogen clouds but there is limited resolution to see other arms of the galaxy.
A corner reflector will work better in most situations due to its lower noise pickup. A commercial alternative shown to work is the NooElec grid antenna.
Wolfgang Herrmann wrote an excellent paper on antenna options, “Hydrogen Line Observations: From frugal to advanced” available on the Astropeiler website. Parts 1 and 4 are required reading.
|
Re: Dish for H-Line observations
Hi Paul
Be aware that 60cm is very small for H-Line work. You will see the local hydrogen clouds but there is limited resolution to see other arms of the galaxy.
A corner reflector will work better in most situations due to its lower noise pickup. A commercial alternative shown to work is the NooElec grid antenna.
Wolfgang Herrmann wrote an excellent paper on antenna options, “Hydrogen Line Observations: From frugal to advanced” available on the Astropeiler website. Parts 1 and 4 are required reading.
Melvyn
|
Dish for H-Line observations
Sourcing a dish for H-Line observations can be a challenge in the UK.? The link below may be useful if you are looking for one....
?
?
?
The cost is about ?224 excluding taxes, shipping etc.
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Nothing particularly interesting here but just to notify that I
am preparing a receiver for shipment to a new location in Scotland
to extend the range of reflection geometries available from the
network. See the live display at
.? Receiver client 3 is
actually still on test at NW Hampshire so ignore it for now. It's
receiver 3? on the live display. I will let everyone know when it
is operating from it's new location.
Brian
|
Re: RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
Hello Phil,
??? ??? I'm afraid that I cannot assist with the computer
problems, but I may be able to help with the SID monitoring. We
publish a monthly activity summary (Radio Sky News) covering SID,
magnetic, solar emission, meteor and muon observations. If you
would like to be added to the mailing list, then please let me
know. Back copies are on the BAA website. The sun is still quite
active, so there have been plenty of SIDs to record.
John Cook.
On 09/02/2025 18:53, philhayward652 via groups.io wrote:
toggle quoted message
Show quoted text
Hi,
?
I
am looking for some help please - I have recently joined the
BAA and have been included in this group after purchasing the
VLF receiver and kit to monitor SID's. which I am still doing
- now I will hopefully in the future be able to compare
results with other members.?
?
Prior
to this I was observing meteors using radio, until
unfortunately my computer crashed. I had some success and I
still have the data as it was backed up - but of course I lost
the programs I was using. Since this I have been unable to get
the set-up working again. I was using a funcube dongle to
receive echoes from the Graves transmitter which was connected
by a virtual cable to ?Spectrum Lab. I used a config file that
the Meteor section of SPA ?supplied which understand was
developed by the BAA although it may have been modified and it
all worked well for 2 or 3 years. I think the version of
Spectrum Lab I now have has been updated and may be the root
cause of the issue in as much as there may be a conflict
between it and ?the config but I don't profess to know in
detail about such things.
?
Any
help anyone could give me on this would be most appreciated
?
Thanks
?
Phil
Hayward G0PSD ? ? ??
?
------ Original Message ------
From: paul@...
To: [email protected]
Sent: Friday, February 7th 2025, 15:32
Subject: Re: [baa-rag] RAZoom Feb. 7th 19:30 GMT Terrestrial
Navigation from Cosmic Radiation’
?
Tonight..
?
The Zoom link for this presentation has been emailed
out.? If you have not received it and want to join please
contact me.
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA
Section Director? ???
|
Re: Block diagram of 1420MHz H-Line Radio Telescope
Hi Andrew, I believe the missing piece here is the feed for the dish. You may have considered this as part of the dish but I think it is worth mentioning. Wolfgang -----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Andrew Thornett
via groups.io
Gesendet: Sonntag, 9. Februar 2025 23:34
An: [email protected]
Betreff: [baa-rag] Block diagram of 1420MHz H-Line Radio Telescope
Hi All,
I have prepared this block diagram - so I thought I'd post it here in case anyone else would find it useful in their presentations etc. - please free to use or publish it as you wish.
Andy
|
Getting started in H-Line radio observing
I am proposing to start an online Zoom series of sessions, to support people who would like to get started in hydrogen line (1420 MHz) radio observing. It will be aimed at folks who have never done this before, beginners but also more experienced
radio astronomers who have never tried H-Line. This will be at a basic level, and will cover basic theory (I’m only a GP!), hardware and software, and then lead through helping folks to select what they would like to do and then the group will give support
to its members as they embark on their first projects.
?
This is intended for people who want to give it a go practically – expect the costs of purchasing materials for a project of this nature to be around ?200 plus you will need some form of computer which does not need to be powerful nor modern
– I use 2nd hand mini-PCs, some people use Raspberry Pis, etc.
?
At this stage, I would like to gauge whether there is any interest in this – so if it interests you then please email me on andrew (at) thornett (dot) net
?
Andy
?
Dr Andrew Thornett M6THO
|
Cantenna making graphic (Andrew Thornett (C) 2025) 090225
|
The new telescope was installed at Lichfield Radio Observatory this winter..........
?
?
|
Block diagram of 1420MHz H-Line Radio Telescope
Hi All,
I have prepared this block diagram - so I thought I'd post it here in case anyone else would find it useful in their presentations etc. - please free to use or publish it as you wish.
Andy
|
Re: RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
Hi Phil
I would be very happy to assist if I can - andrew (at) thornett (dot) net - just to say I do have meteor scatter working and am happy to help but if someone more expert than i offers help then I wouldn't be offended if you went with them instead!?
Andy
Sent from
toggle quoted message
Show quoted text
Hi,
?
I am looking for some help please - I have recently joined the BAA and have been included in this group after purchasing the VLF receiver and kit to monitor SID's. which I am still doing - now I
will hopefully in the future be able to compare results with other members.?
?
Prior to this I was observing meteors using radio, until unfortunately my computer crashed. I had some success and I still have the data as it was backed up - but of course I lost the programs I
was using. Since this I have been unable to get the set-up working again. I was using a funcube dongle to receive echoes from the Graves transmitter which was connected by a virtual cable to ?Spectrum Lab. I used a config file that the Meteor section of SPA
?supplied which understand was developed by the BAA although it may have been modified and it all worked well for 2 or 3 years. I think the version of Spectrum Lab I now have has been updated and may be the root cause of the issue in as much as there may be
a conflict between it and ?the config but I don't profess to know in detail about such things.
?
Any help anyone could give me on this would be most appreciated
?
Thanks
?
Phil Hayward G0PSD ? ? ??
?
------ Original Message ------
From: paul@...
To: [email protected]
Sent: Friday, February 7th 2025, 15:32
Subject: Re: [baa-rag] RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
?
Tonight..
?
The Zoom link for this presentation has been emailed out.? If you have not received it and want to join please contact me.
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Re: RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
Hi, ? I am looking for some help please - I have recently joined the BAA and have been included in this group after purchasing the VLF receiver and kit to monitor SID's. which I am still doing - now I will hopefully in the future be able to compare results with other members.? ? Prior to this I was observing meteors using radio, until unfortunately my computer crashed. I had some success and I still have the data as it was backed up - but of course I lost the programs I was using. Since this I have been unable to get the set-up working again. I was using a funcube dongle to receive echoes from the Graves transmitter which was connected by a virtual cable to ?Spectrum Lab. I used a config file that the Meteor section of SPA ?supplied which understand was developed by the BAA although it may have been modified and it all worked well for 2 or 3 years. I think the version of Spectrum Lab I now have has been updated and may be the root cause of the issue in as much as there may be a conflict between it and ?the config but I don't profess to know in detail about such things. ? Any help anyone could give me on this would be most appreciated ? Thanks ? Phil Hayward G0PSD ? ? ??
?
------ Original Message ------
From: paul@...
To: [email protected]
Sent: Friday, February 7th 2025, 15:32
Subject: Re: [baa-rag] RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
? Tonight.. ? The Zoom link for this presentation has been emailed out.? If you have not received it and want to join please contact me. --
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
UKRAA VLF Receivers for Sale
I have three receivers:
1. Complete kit for assembly (reclosable plastic bag in pictures)
2. Built and ready to use in steel enclosure with meter (orange in pictures)
3. Built and ready to use in aluminum enclosure with meter (silver in pictures)
?
The built units were working when placed in storage several years ago.
?
More pictures available.
?
These will ship from Anchorage, Alaska USA. Price for each is 100 USD + shipping.
?
Estimated shipping to UK is about 35 USD per unit.
?
?
Whit
--
Whitham D. Reeve
Anchorage, Alaska USA
---
|
Re: RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation’
Tonight..
?
The Zoom link for this presentation has been emailed out.? If you have not received it and want to join please contact me.
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Hi,
I took some photos of my TV screen during the Meteorites show. I
have uploaded a folder to Box in case anyone would like to see
them.
Best Regards,
Mike.
On 04/02/2025 14:27, andythomasmail via
groups.io wrote:
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Show quoted text
On holiday in Marrakech once I bought some magnetic rocks, said to
be meteorites? gathered in the desert, but on return home was told
they were volcanic ejecta descending through the atmosphere.
|
On holiday in Marrakech once I bought some magnetic rocks, said to be meteorites? gathered in the desert, but on return home was told they were volcanic ejecta descending through the atmosphere.
|
Martin Cranage
Paul Hearn
 2025) 090225.png)
WReeve
