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by maitya
21 Mar 2006 11:45
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

I think another major issue that needs to be tackeled with AESA/PESA antenna design is the interferenece betw the adjacent (and the near-adjacent) antenna elements - also when compounded with nose-cone internal-reflection issue this becomes a major hurdle What interference are you talking about? I'...
by maitya
21 Mar 2006 10:24
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

Maitya, LNA can not be used as Power amp. The characteristics needed are totally different. The TX/RX channels are different. Some block diagrams show common phase shifter, and some show individual phase shifters for TX/RX path. Thanks Dileep ... Fair enough - though theoretically , it looked to me...
by maitya
20 Mar 2006 14:27
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

... Regarding L band to X band migration in hardware, I don't think we have any showstoppers to reach 1st Gen AESA capability in hardware. It simply takes time, and a lot of it at that ... Errr, another question!! :oops: Per the unclassified open source info, do the 1st Gen AESA use one single ampl...
by maitya
13 Mar 2006 14:13
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

Methinks the first indian AESA will be the DRDO AEW platform as that permits a larger size and power budget for a starter effort. ... only the third proj around 2015 timeframe I expect will be a compact fighter aesa For that we need to successfully progress from a L-band based to a X-band based Tx/...
by maitya
13 Mar 2006 14:02
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

You can also mix modes together with a mechanically scanned or passive phased array. You do this by interleaving the two modes. The radar does the two different modes one after the other in quick succession, and the radar computer interpolates the data for each mode separately. This is how Bars, RB...
by maitya
13 Mar 2006 10:47
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

From MRCA thread In the first gen AESA, you just add active circuitry (amplifiers) into the individual modules. They are still fed with a master signal, because they should be synchronous to each other PRECISELY. This master signal is phase shifted and fed to a power amplifier. This is where I alwa...
by maitya
05 Mar 2006 16:28
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

Israel very well knows unless its a full blown AESA it stands zero chances in export and upg market when nora, amsar, apg-xx and zhuk are all in the fray. Ummm ... not too sure if IAF is not salivating at the prospect of "Western" (aka non-Russian) PESA in some of it's "western"...
by maitya
05 Mar 2006 12:45
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

That's sad because the Blue Fox is overwhelmingly outperformed by older, technologically inferior French and Russian sets. It can track only 1 target and suffers from sea clutter even after a block upgrade. Being planar array, maybe the sidelobes have smaller values compared to the cassegrain ones....
by maitya
05 Mar 2006 12:26
Forum: Mil-Tech Archive
Topic: Radar thread - specs & discussions
Replies: 328
Views: 124013

Dileep wrote:That means this one is the first gen AESA where you just have a TX and LNA on the TX/RX module. Not too much advanced from PESA functionally.

You mean, no Phase Shifter on the Tx/Rx modules ... well, how the hell is it so advanced compared to PESA, then ...
by maitya
19 Jan 2006 10:50
Forum: Military Issues Archive
Topic: First IL-38 upgrade returns home
Replies: 88
Views: 42960

Himanshu wrote:... adding numbers of 38's would have been a good idea..

Nope ... not without "proven" ASCM (aka Brahmos for us) firing capability. With that though (from a survillence to an offensive platform, right), it becomes a fantastic toy to own, IMO ... :D
by maitya
09 Dec 2005 22:12
Forum: Military Exercises Archive
Topic: Cope India 2005 - Kalaikunda AFS - Part II
Replies: 254
Views: 100711

BTW, the Jaguar upgrade is stated to have got a new ASPJ as part of the program. This what I don't get - an internal SPJ was always an integral part of the Bison programme - and so should be part of the 27/Jaguar and probaly MKI too. Now external ASPJ may be ok for 27/Jaguar/MKI - but WHY on a Biso...
by maitya
24 Nov 2005 13:27
Forum: Military Exercises Archive
Topic: Cope India 2005 - Kalaikunda AFS - Part II
Replies: 254
Views: 100711

Shiv-ji/Jagan, This one needs to go to the Bison Image Page ... :D
http://www.bharat-rakshak.com/cope/Picture_015.jpg

Of course with Vishnu's consent ... :)
by maitya
18 Nov 2005 13:05
Forum: Military Exercises Archive
Topic: Cope India 2005 - Kalaikunda AFS - Part I
Replies: 337
Views: 134024

Re: Vishnu's report

Vishnu Som was seen giving a brief lecture on cope-india standing infront of an F-16 ...

That's an excellent presentation by Vishnu ... could've been for a little more duration though :(
But overall an excellent presentation ...
by maitya
09 Jun 2005 13:30
Forum: BR Nostalgia Archive
Topic: Survey: Which page on BR do you visit first?
Replies: 29
Views: 15892

Obviously, BRF::Military Issues and History forum
by maitya
19 Jun 2004 07:36
Forum: Mil-Tech Archive
Topic: The Saras Flies!
Replies: 236
Views: 74933

Re: The Saras Flies!

Originally posted by bansal: ... all-up weight of 6,900 kg ... with a capacity of 14 passengers would have a range of about 400 km, the executive version, with eight passengers, would have a range of as much as 2,000 km. From Asharma's link from floonnet - design objectives were: MTOW: 6,100 kg Max...
by maitya
16 Mar 2002 19:48
Forum: Mil-Tech Archive
Topic: Understanding INSAS
Replies: 176
Views: 44546

Re: Understanding INSAS

Originally posted by Raj Malhotra:
Raj, from that CAG link ... so OFBs has managed a max of 68-70K/year production base ... so discounting all that are produced so far, it'll take 13 more yrs (from 99-00 onwards) to achieve the said desired total of 1.2m :eek:
by maitya
16 Mar 2002 15:16
Forum: Mil-Tech Archive
Topic: Understanding INSAS
Replies: 176
Views: 44546

Re: Understanding INSAS

Originally posted by Raj Malhotra: Understanding INSAS Excellent Article!! One definitely for the Monitor ... and also qualifies for a permanent link from the "Infantry Weapons:Specifications" section. But some more info on the reported problems in Siachin viz from HT: major defects like cold arres...
by maitya
17 Dec 2001 18:29
Forum: Mil-Tech Archive
Topic: T-72s in Chechnya, From Armour Magazine
Replies: 254
Views: 44345

Re: T-72s in Chechnya, From Armour Magazine

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Rajesh Raman:<BR><STRONG>What are the advantages/disadvantages of using a gas turbine engine for Arjun? </STRONG><HR></BLOCKQUOTE><BR>Rajesh, I'm not an expert - but this I'll say. Using Gas turbine engines in Ind...
by maitya
15 Dec 2001 19:16
Forum: Military Issues Archive
Topic: Weapons & Equipment for Special Forces
Replies: 36
Views: 26372

Re: Weapons & Equipment for Special Forces

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by vmshete:<BR><STRONG>How about providing these guys with INSAS 5.56mm RIFLES?</STRONG><HR></BLOCKQUOTE><BR>Hummm ... let's see how many needs to replaced,<P>0.410 Muskets ------ 90,000<BR>0.303 SMLE Mk.1/4 - 500,00...
by maitya
15 Dec 2001 18:47
Forum: Military Issues Archive
Topic: Weapons & Equipment for Special Forces
Replies: 36
Views: 26372

Re: Weapons & Equipment for Special Forces

I only hope that 7.62 mm FN FAL (and other versions) that're being replaced by 5.56mm INSAS for IA, are recycled to the police forces in turn replacing the 0.303 ones. :( <BR>IMHO, it was somewhere around 90,000 (1997 figures) INSAS already in IA service!!<P>So many people here are talking about 0.3...
by maitya
28 Jul 2001 16:58
Forum: Military Issues Archive
Topic: Indian Aerospace Industry Developments
Replies: 50
Views: 24385

Re: Indian Aerospace Industry Developments

For all those nay-sayers (regarding LCA), the article should be something of an eye-opener.<BR><B> <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Saab, Dassault Upgrade Gripen, Rafale Fighters <a href="http://www.aviationnow.com/avnow/news/channel_military.jsp?view=story&id=ne...
by maitya
17 Jul 2001 19:57
Forum: Military Issues Archive
Topic: Indian Aerospace Industry Developments
Replies: 50
Views: 24385

Re: Indian Aerospace Industry Developments

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by rama:<BR><A HREF="http://www.expressindia.com/fe/daily/19980706/18755324p.html" TARGET=_blank>http://www.expressindia.com/fe/daily/19980706/18755324p.html</A> <HR></BLOCKQUOTE><BR>I must've gone mad ... but this r...

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