Re: Geomagnetic sine wave
Hi Martyn,
?
I use SpectrumLab with a b/w of 150Hz for
each freq that I monitor and the spectrum plot still
shows that HWU is off the air.
?
It would be interesting to see if you trace
for 24th November shows the sudden increase that I saw
on 22.1kHz, then that would prove that you
are actually monitoring Skelton.
?
Mark
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Re: Geomagnetic sine wave
Hi Mark
?
A good point. I am using the UKRAA receivers, the tuning is mainly carried out by the loop aerial and ATU which? is quite High Q. The front end of the receiver also has a Q plus frequency settings. Its certainly tuned, but I am not absolutely sure to what.. ?
?
I used a DDS signal generator to tune the front end then peaked the aerial to what I thought was HWU (Rosnay) on 22.6kHz. Its been there for about 2 years now.
?
If its not Rosnay then it could be Skelton but that is rather close for the signals that I have been receiving.
?
The second receiver that I use is tuned to DHO which I know is correct as it has the characteristic morning shut down.
?
Best wishes
-- -- Martyn
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Via [imo-news] possible new meteor shower on the 12th Dec
Just seen this on imo-news io group...
May be of interest.
BTW enjoyed Monday's Zoom, really clear exposition of the black hole phenomenon. Thanks.
Regards
Mike D.
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Hi Mark - I don't think my magnetometer plots are very convincing....
I've attached the curtailed plot for the 03 Dec (we had a power outage affecting part of our property from 14:00 or so on). And i've attached an expanded plot from 08:00 to 09:30 which possibly shows some low frequency?oscillations And a plot from 10:00 to 10:30 which does not really show anything interesting.
All the best Callum
On Tue, Dec 5, 2023 at 11:53?AM Martyn Kinder < martyn@...> wrote: My graphs from 20231203
I can see the oscillation on 22.6kHz as well, but not as pronounced. The magnetometer is still unsettled in By following the CME impact a few days ago but Bx may show some oscillation although it is not as obvious.?
Best wishes?
Martyn?
--
--
Martyn
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Re: Geomagnetic sine wave
Martyn,
?
That's curious, I haven't received
anything on 22.6kHz since 17th October when the tx went off and disappeared
into the noise.
I wonder what your receiver bandwidth is?
?
Cheers,
?
Mark
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My graphs from 20231203
I can see the oscillation on 22.6kHz as well, but not as pronounced. The magnetometer is still unsettled in By following the CME impact a few days ago but Bx may show some oscillation although it is not as obvious.?
Best wishes?
Martyn?
--
--
Martyn
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Some time back Callum reported a rapid
oscillation in the magnetosphere.
I read that these ULF waves range in
frequency from 1mHz to 5Hz.
?
Yesterday (3rd Dec) we had a rapid
oscillation on 22.1 and 19.6kHz between about 10:00 and 10:30
with a period of ~5mins so about 3mHz
(Pc5).
?
In the plots the yellow trace is 22.1kHz
and the brown 19.6kHz. No other freqs. showed the oscillation.
The Norway Line mag plot shows a day full
of oscillations, so I presume that the VLF effects were from
such a magnetosphere oscillation....
?
Mark
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Re: Meteor Project update
Hi Mike I posted this image last year on the beacon discussion group. This was with a Moxon pointing up, and a 4 element pointing at the beacon - the two being fed into the cancellation system. Switching between the correctly adjusted cancellation and 180 degree phase difference every 30 seconds gave almost perfect cancellation and little difference to the aircraft trails, although no meteor pings visible at the time. I have also tried just aligning the elements as you suggest - I'm not sure if I have an image of that. In any case, there are too many aircraft reflections from here, so I found it impossible to get Spectrum lab to report meteors.  Tony
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RAZoom Programme 2024 - Published
Hi
The RAZoom Programme for 2024 has now been published and can be found
Kind Regards
John Berman
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Quasars, black holes, and future of the Milky Way Now on You Tube
Hi
?
Radio Astronomy Section Zoom Friday the 1st Dec 2023
?
Prof Clive Tadhunter? 'Quasars, black holes, and future of the Milky Way'
?
Video is now on YouTube
?
You can find links to previous meeting videos and associated materials
?
Kind Regards
John B
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Re: Meteor Project update
Re elements pointing at TX that’s the element ends of course
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Re: Meteor Project update
Tony
In my now dim distance professional life I built a microwave anechoic chamber and used a phase shifter to balance out background reflections and I do know how sensitive the nulls are even under lab conditions. ?Have you tried Yagi point vertically as in the paper I mentioned? ?With the elements pointing directly at the TX I wouldn’t have thought you would have got much direct signal. ?And after all, the meteors are up above so vertical isn’t such an unreasonable option. ?Again see the paper for results and discuss if you like.
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Re: Meteor Project update
Hi Mike
I am even closer than Dave - Leicester, and get a strong direct signal. I have done a lot of experiments with a vertically pointing Moxon and secondary dipole antenna with phase shifter to null out the direct signal. The settings are quite critical and changes of propagation plus antenna movement cause the direct signal to reappear. It does work, but another down side is that it will also null out certain meteor echoes, so isn't entirely satisfactory. I have also got reasonable results with a 4 element yagi pointing almost vertically, with the elements aligned towards the beacon to null out the direct signal. However, a long distance from the transmitter is the best answer.
Tony
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Re: Meteor Project update
Hello Mike
Dave's receiver system is using an indoor HB9CV type antenna in
his apartment loft space. This is an elevated location with a good
path towards the beacon hence the strong direct signal. This is
not ideal but it is great that Dave has put together a receiver on
his own account, not a part of the main project. We hope that
there will be more "independent" receivers in the future. We will
be publishing the receiver design and software will be open source
when all is stable. Processing the data at the server to produce
the displays we currently have is consuming a lot of processing
power and we have had to limit the displayed bandwidth to +/-30Hz
for now. We are working on ways to deal with this problem and
there will be changes at some point in the future to improve the
display scope and resolution. I think we will, in the end have to
limit the number of receivers we can display on the web page and
pick the best.? The raw data from at least some, the best,? of the
receivers will be available for you and any other "serious"
observers to access and process using your own software of choice
and, we hope, develop things such as the "event trigger", rolling
buffer to store maybe 10 seconds of data around "significant"
events for later analysis and correlation using the embedded
timing data... and more. Such developments may form phase 3 of the
project which we are beginning to think about.? I am hopeful that
we will be able to get support for this once Phase 2 is up and
running as we would wish.
Brian
On 02/12/2023 17:58, Mike German via
groups.io wrote:
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I've been viewing the streams on and off for a few hours now.?
Would I be correct to assume that Dave's station nr Malvern is
receiving the direct signal from Sherwood?
If a directional antenna is being used it may be possible to
direct it away? so that it is puts the direct signal in a antenna
null perhaps.
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Re: Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way
....that was my thought..!
Sent from
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Re: Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way
Maybe it doesn't like P's ?
Best Wishes,
Peter
Peter W East OBE FREng
Mob: 07887648435
Get
On 3 Dec 2023, at 09:24, Paul Hearn < paul@...> wrote:
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Peter,
? Thanks for the Mail.?
? Pleased that you enjoyed the Ballet.? I must confess that I have only been twice (Moscow and Covent Garden) and was so surprised that I enjoyed it a lot.
? The Friday RAZOOM was so good – Prof Tadhunter – the end of the milky way (Don’t worry it will be after Christmas!).? It will be posted on our YouTube channel on Monday.
? I’ll look at my email manager.? Paul Hyde and I also didn’t get the link…… ? Best wishes, ? Paul. ? Paul Hearn BAA Radio Astronomy Section Director UKRAA Trustee
? ???? British Astronomical Association? ??
?? e???? paul@... a???? RG6 1BU UK t???? +44 (0)7967 388 578 ?
?
?
? ? Thanks Paul, I didn't get the link earlier but never contacted you as I couldn't make it, but will be sure to watch the video when it is released. I took my wife and granddaughter to see Swan Lake Ballet - it was delightful! Sure it went well - you certainly are getting some super speakers and topics. Well Done, Best Wishes, Peter On 01/12/2023 19:51, Paul Hearn wrote: Join Zoom Meeting
Meeting ID: 861 7774 6303
Passcode: 204513 ? ?
--
???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???
|
Re: Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way
Peter, ? Thanks for the Mail.? ? Pleased that you enjoyed the Ballet.? I must confess that I have only been twice (Moscow and Covent Garden) and was so surprised that I enjoyed it a lot. ? The Friday RAZOOM was so good – Prof Tadhunter – the end of the milky way (Don’t worry it will be after Christmas!).? It will be posted on our YouTube channel on Monday. ? I’ll look at my email manager.? Paul Hyde and I also didn’t get the link…… ? Best wishes, ? Paul. ? Paul Hearn BAA Radio Astronomy Section Director UKRAA Trustee ? ???? British Astronomical Association? ??
?? e???? paul@... a???? RG6 1BU UK t???? +44 (0)7967 388 578 ? ? ? ?
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From: [email protected] <[email protected]> On Behalf Of pwe237
Sent: Saturday, December 2, 2023 12:16 AM
To: [email protected]
Subject: Re: [baa-rag] Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way? Thanks Paul, I didn't get the link earlier but never contacted you as I couldn't make it, but will be sure to watch the video when it is released. I took my wife and granddaughter to see Swan Lake Ballet - it was delightful! Sure it went well - you certainly are getting some super speakers and topics. Well Done, Best Wishes, Peter On 01/12/2023 19:51, Paul Hearn wrote: Join Zoom Meeting
Meeting ID: 861 7774 6303
Passcode: 204513 ? ?
--
???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Re: Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way
Thanks Paul,
I didn't get the link earlier but never contacted you as I
couldn't make it, but will be sure to watch the video when it is
released.
I took my wife and granddaughter to see Swan Lake Ballet - it was
delightful!
Sure it went well - you certainly are getting some super speakers
and topics.
Well Done,
Best Wishes,
Peter
On 01/12/2023 19:51, Paul Hearn wrote:
toggle quoted message
Show quoted text
Join Zoom Meeting
Meeting ID: 861 7774 6303
Passcode: 204513
?
Sent from
--
???? Paul Hearn? ???? ?paul@...? ???? ?RA
Section Director? ???
|
Re: Fri. Dec. 1st RAZoom - Quasars, black holes and future of the Milky Way
Join Zoom Meeting
Meeting ID: 861 7774 6303
Passcode: 204513 ?
Sent from
--
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Paul Hearn