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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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27th Oct 2007, 10:18 am | #1 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Pulse forming network design - any hints?
Does anybody know of an accessible guide to designing pulse forming networks, or know where I can see a schematic for an old radar modulator using a thyratron?
The older the better, as I want to stay at the lowest possible frequencies, where I have some chance of understanding what's going on! I know absolutely nada about this, so treat me as a complete radar novice, please. Many thanks Astral |
29th Oct 2007, 5:46 pm | #2 |
Hexode
Join Date: Mar 2006
Location: Helston, Cornwall, UK.
Posts: 303
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Re: Pulse forming network design - any hints?
Maybe worth putting this request on the IET communications forum
http://www.theiet.org/Forums/forum/index.cfm I'm sure there will be many there who will help Cheers Tim M0AFJ |
30th Oct 2007, 11:07 am | #3 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Pulse forming network design - any hints?
Quote:
Thanks Tim! (MOAFJ) |
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30th Oct 2007, 1:30 pm | #4 |
Octode
Join Date: Feb 2006
Location: Bristol, UK.
Posts: 1,042
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Re: Pulse forming network design - any hints?
How much information do you need? I can let you have a copy of part of a manual describing line modulators and PFN's as used by Varian. The manual is part of the set used for the maintenance of linacs, basically a high power PFN for a 5MW pk power magnetron.
Let me know if it would be any use. Malcolm |
31st Oct 2007, 12:29 am | #5 |
Retired Dormant Member
Join Date: Mar 2003
Location: Bishop's Waltham, Hants, UK.
Posts: 939
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Re: Pulse forming network design - any hints?
Somewhere (!) I have the joint services textbook which covers this. I'll try and dig it out, but it is basically a transmission line tuned to the PRF.
Jim. |
2nd Nov 2007, 11:32 am | #6 |
Hexode
Join Date: Apr 2003
Location: Cotswolds, UK.
Posts: 465
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Re: Pulse forming network design - any hints?
Chapter 5 Microwaves and Radar Electronics Pollard & Sturtevant 1948 John Wiley & Sons
Your library should be able to get a copy. Robin |
2nd Nov 2007, 11:59 am | #7 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
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Re: Pulse forming network design - any hints?
Quote:
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2nd Nov 2007, 12:00 pm | #8 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Pulse forming network design - any hints?
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2nd Nov 2007, 12:01 pm | #9 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Pulse forming network design - any hints?
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3rd Nov 2007, 4:12 pm | #10 |
Hexode
Join Date: Mar 2006
Location: Helston, Cornwall, UK.
Posts: 303
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Re: Pulse forming network design - any hints?
Astral, please slate my curiosity,are you going to build a radar transmitter?
Just interested |
3rd Nov 2007, 4:24 pm | #11 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Pulse forming network design - any hints?
I have been thinking about it, yes. Even a very small one will do. But I'd certainly like to get to the position of being able to build one, even if I don't actually go that far.
Hence: https://www.vintage-radio.net/forum/...ad.php?t=22075 |
5th Nov 2007, 2:32 pm | #12 |
Octode
Join Date: Feb 2006
Location: Bristol, UK.
Posts: 1,042
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Re: Pulse forming network design - any hints?
Ah yes, may be a bit over the top in terms of power. However the general theory is the same for all PFN's, Charge up a bank of capacitors from a high voltage source and then discharge them through a coil to make a pulse as opposed to a spike which you would get if the caps were just discharged in to a load. The usual device for the discharge is a thyratron as it can switch a high voltage and current very quickly. A thyristor could be used but they tend to destroy themselves, being of the solid type
Malcolm |