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
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
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
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