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sprstdlyscottsmn

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Unread post11 Aug 2016, 17:07

That was really good. It highlighted the differences between PESA and AESA very well (among a great many other things).
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garrya

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Unread post12 Aug 2016, 03:57

hornetfinn wrote:
While Parabolic , Gregorian and Cassegrain antennas all have very high gain ( small main beamwidth) relative to aperture size .However , they all share the same disadvantages include: high sidelobes (make radars susceptible to low RCS targets and ground clutter)


You could also mention here that higher side lobe levels make radar also more detectable with ESM systems (more energy towards them to work with) and more susceptible to jamming as jamming signal gets through to receiver more easily (side lobe jamming).

About side lobes: Maybe you should mention that there are side lobes in both transmit and receive conditions. Transmit side lobes means unwanted energy is sent outside the main beam (lobe). This makes the radar more detectable by RWR/ESM systems. In receive condition unwanted energy is received from outside the main lobe. This can be intentional jamming or ground returns which both affect radar performance and ability to pick up targets.

I did talk about sidelobes later in the post , it just really down below haha (arranging stuff reasonably is not one of my strong point , so really sorry about that :oops: )
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garrya

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Unread post12 Aug 2016, 03:59

sprstdlyscottsmn wrote:That was really good. It highlighted the differences between PESA and AESA very well (among a great many other things).

Thank you, I am really glad to hear that from a knowledgeable guy like you :D
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garrya

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Unread post12 Aug 2016, 04:05

gideonic wrote:Thank you! Looking forward for finding the time to read it :)

Do you think the post is too long ? Should i reduce the length next time ? Do you think reader may get bored because it too long ?
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gideonic

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Unread post12 Aug 2016, 07:29

garrya wrote:
gideonic wrote:Thank you! Looking forward for finding the time to read it :)

Do you think the post is too long ? Should i reduce the length next time ? Do you think reader may get bored because it too long ?

No, I wasn't being sarcastic. Considering the drove of information, the length looks very good. It's just a bit frustrating, that I need to find an hour or so to actually read through it in detail, but I won't have it for a couple of days :D
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krorvik

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Unread post12 Aug 2016, 08:26

That was a great read Garrya. Undertaking a task like this is monumental - and you're doing a great job! Lots of information, neatly organized into natural sections - and lots of learning to do on my part.

Thank you!
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eloise

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Unread post12 Aug 2016, 10:08

garrya wrote:Do you think the post is too long ? Should i reduce the length next time ? Do you think reader may get bored because it too long ?

Personally ,i prefer long post. But what important is what do most people like ? ,maybe comparing the traffic of now and when you first started ? if it is increased then you doing good , if it decreased then maybe you can try to divide long posts into smaller one and post more often
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hornetfinn

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Unread post12 Aug 2016, 10:58

garrya wrote:
hornetfinn wrote:
While Parabolic , Gregorian and Cassegrain antennas all have very high gain ( small main beamwidth) relative to aperture size .However , they all share the same disadvantages include: high sidelobes (make radars susceptible to low RCS targets and ground clutter)


You could also mention here that higher side lobe levels make radar also more detectable with ESM systems (more energy towards them to work with) and more susceptible to jamming as jamming signal gets through to receiver more easily (side lobe jamming).

About side lobes: Maybe you should mention that there are side lobes in both transmit and receive conditions. Transmit side lobes means unwanted energy is sent outside the main beam (lobe). This makes the radar more detectable by RWR/ESM systems. In receive condition unwanted energy is received from outside the main lobe. This can be intentional jamming or ground returns which both affect radar performance and ability to pick up targets.

I did talk about sidelobes later in the post , it just really down below haha (arranging stuff reasonably is not one of my strong point , so really sorry about that :oops: )


Oh, as I said, I skimmed through it very quickly. My bad, you seem to have covered the side lobe issue pretty nicely.

I think your blog is very well done and best collection of relevant information I've seen yet. Great work! :D
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garrya

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Unread post13 Aug 2016, 07:05

gideonic wrote:No, I wasn't being sarcastic. Considering the drove of information, the length looks very good. It's just a bit frustrating, that I need to find an hour or so to actually read through it in detail, but I won't have it for a couple of days :D

No worries, i know you wasn't being sarcastic, i just ask if you guys think i should reduce the length of the post and thus making it easier for people to read. The length may be a bit discourage.
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garrya

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Unread post13 Aug 2016, 07:07

krorvik wrote:That was a great read Garrya. Undertaking a task like this is monumental - and you're doing a great job! Lots of information, neatly organized into natural sections - and lots of learning to do on my part.

Thank you!

hornetfinn wrote:
I think your blog is very well done and best collection of relevant information I've seen yet. Great work! :D

Thanks alot for your kind words guys. These give me alot of motivation
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garrya

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Unread post18 Aug 2016, 07:44

Guys , i tweak the display of the site a bit ,replace some picture with Gif image, but iam not sure whether it look better or not , and iam also a bit worried that the site may be too slow to load , so can someone try and give me opinion ? should i keep the new display or should i revert back to the old one ?
https://basicsaboutaerodynamicsandavion ... press.com/
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gideonic

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Unread post18 Aug 2016, 08:54

garrya wrote:Guys , i tweak the display of the site a bit ,replace some picture with Gif image, but iam not sure whether it look better or not , and iam also a bit worried that the site may be too slow to load , so can someone try and give me opinion ? should i keep the new display or should i revert back to the old one ?
https://basicsaboutaerodynamicsandavion ... press.com/


Can't say anything for others, but i personally like the new look. Though the gif's DO load WAY too slowly. I suggest you replace them with HTML5 gifv's to reduce the filesize (and loadtimes) by orders of magnitude. The easiest way is to:

1) upload them to imgur
2) Right click -> "Open Video in new Tab" (or copy the link and open manually)
3) Use the new images in in "gifv" format, which is much speedier (you can even deep-link directly to imgur, without downloading these)

I took the liberty of doing that to a few on the site:, hope you don't mind :)
1) http://i.imgur.com/r0E2U7E.gifv
2) http://i.imgur.com/AYWuRh7.gifv
3) http://i.imgur.com/YFmzZnz.gifv

About GIFV you can read more here: http://blog.imgur.com/2014/10/09/introducing-gifv
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garrya

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Unread post18 Aug 2016, 09:42

gideonic wrote:. I suggest you replace them with HTML5 gifv's to reduce the filesize (and loadtimes) by orders of magnitude. The easiest way is to:
1) upload them to imgur
2) Right click -> "Open Video in new Tab" (or copy the link and open manually)
3) Use the new images in in "gifv" format, which is much speedier (you can even deep-link directly to imgur, without downloading these)
I took the liberty of doing that to a few on the site:, hope you don't mind :)
1) http://i.imgur.com/r0E2U7E.gifv
2) http://i.imgur.com/AYWuRh7.gifv
3) http://i.imgur.com/YFmzZnz.gifv
About GIFV you can read more here: http://blog.imgur.com/2014/10/09/introducing-gifv

I tried to upload these gifv instead of gif but wordpress dont allow me to use video :roll: :roll: ( they whether i direct link or download these gifv, they all changed to mp4)
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gideonic

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Unread post18 Aug 2016, 10:05

garrya wrote:I tried to upload these gifv instead of gif but wordpress dont allow me to use video :roll: :roll: ( they whether i direct link or download these gifv, they all changed to mp4)


Hmm strange, once I open the links in new tab, they change to gifv to me (from mp4), at least in Chrome.
I'm not familiar with wordpress inner workings, but does using the video shortcode help? (it can be done with mp4's)
https://codex.wordpress.org/Video_Shortcode
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sferrin

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Unread post18 Aug 2016, 13:08

.gifv blows goats. When you try to download them all it gives you is a link back to the original, not the file itself. At least that's been my experience.
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