Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt

... single-
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

looking for bias tee help - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

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
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel