Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Anatech Electronics - RF Cafe

Building a 16Mhz radio for Senior design project. have Q's - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

donjonson
 Post subject: Building a 16Mhz radio for Senior design project. have Q's
Posted: Wed Sep 19, 2007 7:16 pm 
 
Lieutenant
User avatar

Joined: Wed Sep 19, 2007 6:58 pm

Posts: 4

Hello :D This is my first post on this forum. I am building a 16Mhz radio for my senior design project and Have a few questions. I have been working in PSPICE and am ready to start building and testing.

1)What kind of capacitors should I use in my tuned amplifiers, oscillators, and filters? I have been looking online and there are so many to choose from. I think I should be using something with a small temp coefficient but what material should I use etc..

2)Does anyone know of a place online with low shipping costs and a good selection of components? I have been looking at mouser it seems to be pretty good any other suggestions?

3)In my transmit oscillator I am using an NFET to switch in and out a cap. I am having a difficult time trying to Find one in a TO-92 package with a good enough Ft. Does anyone know where I could go to get this? or perhaps suggest a better device for me to use than an NFET.

thank you for taking the time to read and answer my questions.


 
   
 
nubbage
 Post subject:
Posted: Fri Oct 05, 2007 7:15 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 343

Location: London UK

Hi

I don't have a lot to contribute as to sources, since this depends where you live. In the UK (my home) it would be RS Components, Ambit, or Maplin.

The choice should be polystyrene or ceramic, and at 16MHz wire-ended axial leads would be OK. For an oscillator tuned circuit you want the high Q of the polystyrene, but at 16MHz maybe you need to choose ceramics with both NTC and PTC characteristics, then balance the temperature drift using an air-spaced differential cap, tweaked until the thermal drift is a minimum.

For the FET, an N-channel JFET like the 2N3819 would be OK for 16MHz.

For the power stage a MOS-FET would be good.

Posted  11/12/2012

Exodus Advanced Communications Best in Class RF Amplifier SSPAs - RF Cafe
Berkeley Nucleonics Corporation - RF Cafe
Windfreak Technologies Frequency Synthesizers - RF Cafe

Triad RF Systems Amplifiers - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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