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erik_t
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 12:54 pm
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Does anybody know the nature of the quartet of diagonal poles on the 'shoulders' of the SAMPSON dome? I've often wondered about this.


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MihoshiK
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 1:04 pm
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erik_t wrote: *
Does anybody know the nature of the quartet of diagonal poles on the 'shoulders' of the SAMPSON dome? I've often wondered about this.
I assume they're antennas, but what for I have no idea.

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erik_t
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 2:04 pm
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Some sort of active sidelobe monitoring? But they seem in structure and form much more like a VHF antenna - there's little to indicate to me there's any S-band 'nub' on the end.
large image
And if they were for this purpose, why not have them either at the center of the antenna in height, or duplicate them near the bottom of the array? And what's the deal with the very similar-looking non-rotating poles below the radar?

It looks as much as anything like a severely height-limited set of lightning rods, but this seems silly... doesn't it?

Furthermore, should we make any note of Artisan's somewhat similar bunny-ears?


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erik_t
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 2:14 pm
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:lol: :lol: :lol:

I'll be god damned, that's exactly what they are.

[ img ]

From Protecting Electronic Equipment in Composite Structures Against Lightning, Ph.D. Thesis of one Mihai Alexandru Blaj, Centre for Telematics and Information Technology 2015.

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MihoshiK
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 2:29 pm
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erik_t wrote: *
Some sort of active sidelobe monitoring? But they seem in structure and form much more like a VHF antenna - there's little to indicate to me there's any S-band 'nub' on the end.
large image
And if they were for this purpose, why not have them either at the center of the antenna in height, or duplicate them near the bottom of the array? And what's the deal with the very similar-looking non-rotating poles below the radar?

It looks as much as anything like a severely height-limited set of lightning rods, but this seems silly... doesn't it?

Furthermore, should we make any note of Artisan's somewhat similar bunny-ears?
I read somewhere that a lot of ARTISAN tech is derived from SAMPSON, so those things might very well serve a similar purpose. What that purpose is though...

Edit:

Argh. Lightning rods. Oh well.

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erik_t
Post subject: Re: Updated Type 45Posted: April 20th, 2018, 2:41 pm
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I recommend reading, or at least skimming, the paper. One interesting note is that we ought to try to represent segmented lightning diverters on the satcom dome on I-Mast, as in aviation practice.

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MihoshiK
Post subject: Re: Updated Type 45Posted: April 21st, 2018, 8:36 am
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erik_t wrote: *
I recommend reading, or at least skimming, the paper. One interesting note is that we ought to try to represent segmented lightning diverters on the satcom dome on I-Mast, as in aviation practice.

[ img ][ img ]
Thanks for the link. This is interesting reading.

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Hood
Post subject: Re: Updated Type 45Posted: April 21st, 2018, 9:31 am
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That is interesting, I had never realised that. I just assumed they were an antenna of some description.

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waterwings
Post subject: Re: Updated Type 45Posted: April 22nd, 2018, 10:19 pm
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general drawing husbandry. That's interesting about the lightning rods ... I guess a solid strike would fry SAMPSON pretty terminally! :roll:

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