Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

Cavity Filter - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


labro
Post subject: cavity filter
Unread postPosted: Wed Feb 11, 2004 1:40 am

Hallo,
I am a RF engineer and I'd like to implement narrow cavity filters for catv.
bandpass examples are 62.25MHz, 399.25MHz and 793.25MHz which must reject 25dB 7MHz apart of these pilot carriers.
notch examples are same frequencies but also 7MHz wide to suppress a TV channel.
I am using Eagleware softwares.
I don't understand the mechanical part of implementing a cavity filter (dimensions, how to hold the vertical coils, how to fix the tuning screws,...)
I have found the Zverev old book but it is no as clear for a beginner in this field.

Can somebody help me ?

Marc


Top


JGP
Post subject: cavity filter
Unread postPosted: Fri Feb 13, 2004 2:47 pm

Welcome to Forum!

RF Cavity filters like any other filters (passive or active) require experience, but you are moving in the right direction here. There are some many technical issues to discuss in order to accomplish this design. Before, I help you design (if you want me to help) these cavities, you must provide some critical information such as: Max RF output power, Max Insertion Loss (desirable), Is there Max Time Delay and Phase Linear requirement (remember you are dealing with video and audio)? ...These are high Q coaxial cavities. Size, loop setting, critical coaxial cable length...etc are very critical to know in order to design these cavities. For 62.25MHz, it is not going to be that small and customized rack mounting panel will be required! As for 399.25MHz and 793.25MHz, you will be able to fit them into standard 19” rack mounting panel. Again, you will have to decide on rack mounting panel. For your information, if you choose round or square cavity, it will not make any difference as far the performance goes! In order to give you an exact answer on electrical & mechanical specs, I suggest you contact me via email at jgp882003@yahoo.com or jgp95@hotmail.com and I will be keen to help you.

Sincerely,
John Pereira


Top


JGP
Post subject: cavity filter
Unread postPosted: Fri Feb 13, 2004 8:37 pm

Hi Marc,

I understand you want to design these cavity filters. As an alternative and in case you would like to buy them there are many CATV (cable tv) filters manufacturing around the world. Following are some companies:

http://www.temwell.com.tw/p1.htm

http://www.rfcafe.com/vendors/components/filters.htm

Sincerely,
John Pereira



Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line