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Search: Posts Made By: First_Principal
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Forum: The Pacific: General Aviation & Questions
3rd Apr 2018, 10:28
Replies: 558
Views: 200,248
Posted By First_Principal

Just some general points FYI: LF (500KHz)...

Just some general points FYI:


LF (500KHz) will travel further as a ground wave, and be less affected by 'things in the way', than MF (7.5MHz). VLF goes even further (and is what is used for...
Forum: The Pacific: General Aviation & Questions
28th Mar 2018, 20:02
Replies: 558
Views: 200,248
Posted By First_Principal

Just to add a little more to this; there exists a...

Just to add a little more to this; there exists a phenomenon known as 'exalted signal [or carrier[ reception', something I first experienced slightly more than 40 yrs ago. The essence of this is that...
Forum: The Pacific: General Aviation & Questions
28th Mar 2018, 07:47
Replies: 558
Views: 200,248
Posted By First_Principal

Matt, this was discussed over twenty days ago,...

Matt, this was discussed over twenty days ago, you may wish to read the preceding and following posts for some context; my comment was perhaps relevant then, I don't think it is in this stage of the...
Forum: The Pacific: General Aviation & Questions
12th Mar 2018, 19:25
Replies: 558
Views: 200,248
Posted By First_Principal

Ah yes, quis custodiet ipsos custodes indeed? ...

Ah yes, quis custodiet ipsos custodes indeed?

It all seems a bit of a red herring to me. Whilst forensic investigation is an interesting field, and some new methodology could shed light on...
Forum: The Pacific: General Aviation & Questions
8th Mar 2018, 05:27
Replies: 558
Views: 200,248
Posted By First_Principal

That report seems remarkably ambiguous; taking a...

That report seems remarkably ambiguous; taking a DNA sample today is de rigueur for this sort of thing, I wonder why they've not done this?

Perhaps it's yet to come, certainly should be possible...
Forum: The Pacific: General Aviation & Questions
7th Mar 2018, 20:02
Replies: 558
Views: 200,248
Posted By First_Principal

David, I see several possibly interesting sources...

David, I see several possibly interesting sources of data; Sam Lawson may have some useful knowledge of the logging operation you're interested in, could be worth a call:
...
Forum: The Pacific: General Aviation & Questions
7th Mar 2018, 07:56
Replies: 558
Views: 200,248
Posted By First_Principal

@David Billings: Would I [tell anyone where to...

@David Billings: Would I [tell anyone where to look]? Perhaps, for the greater good, I might. But then, I can be dispassionate about this whereas you've spent a good deal of your life on the project...
Forum: The Pacific: General Aviation & Questions
7th Mar 2018, 05:26
Replies: 558
Views: 200,248
Posted By First_Principal

Hello David, I must confess to being slightly...

Hello David, I must confess to being slightly bemused by your response - why wouldn't you say where the area is?

My comment re location was mostly in passing and by way of discussion and enquiry...
Forum: The Pacific: General Aviation & Questions
6th Mar 2018, 19:23
Replies: 558
Views: 200,248
Posted By First_Principal

David; that's good, I was a little concerned...

David; that's good, I was a little concerned someone may have led you to believe you'd get more than that from LiDAR.

Although you've not said exactly where this site is on the island I had a look...
Forum: The Pacific: General Aviation & Questions
5th Mar 2018, 20:13
Replies: 558
Views: 200,248
Posted By First_Principal

@MJA Chaser: Thanks for the link, I've had a look...

@MJA Chaser: Thanks for the link, I've had a look at the video on the MDX search and from what I glean from that there's no indication that the equipment isn't working as they would hope. I have also...
Forum: The Pacific: General Aviation & Questions
5th Mar 2018, 08:40
Replies: 558
Views: 200,248
Posted By First_Principal

Quite, I wouldn't expect 100's of metres range,...

Quite, I wouldn't expect 100's of metres range, but if it wasn't possible to detect a 210 at say 20 or 30 metres I suspect the equipment may not have been ideal for the task in hand.

I base this...
Forum: The Pacific: General Aviation & Questions
5th Mar 2018, 05:37
Replies: 558
Views: 200,248
Posted By First_Principal

Ok, thanks. I was interested in the type of...

Ok, thanks. I was interested in the type of magnetometer researched (eg. fluxgate, caesium, potassium etc), their sensitivity, the type/mass of the target material and whether the proposed search was...
Forum: The Pacific: General Aviation & Questions
5th Mar 2018, 04:01
Replies: 558
Views: 200,248
Posted By First_Principal

Do you have any detail on this research? I'm...

Do you have any detail on this research? I'm going through the process at the moment and it would be useful to know more about the inputs and outcome of any evaluation.

FP.
Forum: The Pacific: General Aviation & Questions
1st Mar 2018, 00:49
Replies: 558
Views: 200,248
Posted By First_Principal

I spent a little time this morning attempted to...

I spent a little time this morning attempted to call some people in Australia who may have more of an insight with regard to use of magnetometers in this particular area (in both senses of the word...
Forum: The Pacific: General Aviation & Questions
28th Feb 2018, 18:19
Replies: 558
Views: 200,248
Posted By First_Principal

Thanks for that info, it gives me some useful...

Thanks for that info, it gives me some useful detail to consider now.

I suspect a Caesium magnetometer may be capable of reasonably detecting the sort of thing you're looking for at that distance...
Forum: The Pacific: General Aviation & Questions
28th Feb 2018, 08:28
Replies: 558
Views: 200,248
Posted By First_Principal

Er, good to hear about the angles, I trust they...

Er, good to hear about the angles, I trust they work out! Perhaps in the interim you could humour me for a moment?:

Because of my background I have both a personal and professional interest in ...
Forum: The Pacific: General Aviation & Questions
28th Feb 2018, 03:25
Replies: 558
Views: 200,248
Posted By First_Principal

David, sorry to hear of the LiDAR costs, however...

David, sorry to hear of the LiDAR costs, however that may leave the field open for a 'proper' geomagnetic survey...

From your description of your magnetometer I'm not sure that what you had is...
Forum: The Pacific: General Aviation & Questions
27th Feb 2018, 21:26
Replies: 558
Views: 200,248
Posted By First_Principal

David, I've posted previously on this regarding...

David, I've posted previously on this regarding [magnetic] gradiometers (and also ionospheric propagation on that day, but that's another matter).

Having - admittedly rather briefly - reviewed...
Forum: The Pacific: General Aviation & Questions
21st Feb 2018, 03:05
Replies: 558
Views: 200,248
Posted By First_Principal

David, it's clear you research things other than...

David, it's clear you research things other than missing aircraft just as thoroughly :E

I applaud your tenacity - and clear turn of phrase - and hope you are successful in locating whatever it is...
Showing results 1 to 19 of 19


 
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