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: question about balun? Posted: Sat Sep 12, 2009
Joined: Sun Jun 07, 2009 9:14 am
1.Who know the balun(T2&T3) in following picture is
1:4 or 1:9?
2.If the balun(T2&T3) is 1:4,then what is
the different between this balun and another balun(T4&T5) as following
subject: Re: question about balun?Posted: Wed Sep 16, 2009 12:18 pm
Joined: Thu Mar 30, 2006 9:01 am
Based on the cascode transistor configuration,
I'd say those are coaxial implementations of 3dB hybrid couplers for
the input and output. Length differences for input/output are for bandwidth/tuning
Post subject: Re: question about
balun?Posted: Thu Sep 17, 2009 8:09 am
Sun Jun 07, 2009 9:14 am
Thank Jose Arrina.
know the impedance transform of the balun is 1:4 or 1:9?