RF Cascade Workbook 2018 by RF Cafe
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
    Kirt Blattenberger,


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:


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 App Notes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Homepage Thank you for visiting RF Cafe!
Innovative Power Products Resistors

looking for bias tee help - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 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. If the folks at phpBB would release a version with integrated sign-in from the major social media platforms, I would resurrect the RF Cafe Forums, but until then it is probably not worth the effort. 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.

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

Post subject: looking for bias tee help Posted: Thu Aug 03, 2006 9:36 pm


Joined: Wed Oct 27, 2004 4:56 pm
Posts: 2
We're trying to make a 50 KHz to 3 GHz bias tee. Here are the specs if anyone can help (for a price, of course).

S21 1dB or less to 3 GHz
S11/S22 1.6:1 or less to 3 GHz
RF/DC isolation 30dB min
Input power 5 Watts
24V @ 3A

We have a chassis and pc board already fabbed. The board is FR4, .062 and 1oz of copper plating. Also using 0.1uF 1206 for the coupling cap. For the bypass, we're using 1000pF, 0.022uF and 10pf 1206 caps. Where we need help is selecting the proper inductors, not only for performance and power, but size. I'm told that we need a number of inductors to cover about 4 octaves. Inside the chassis, we're limited to 1.2"H X 1.6"L X .480" depth. Anyone with the proper CAD tools may be able to help. Project should be in the area of 2-3 hours time. Please let me know at the earliest if you can help. Thanks in advance.[/code]

Posted  11/12/2012
RF Superstore (RF Components) - RF Cafe
EMC Directory

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

These Are Available for Free