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question about balun? - 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.


Tiany
Post subject: question about balun? Posted: Sat Sep 12, 2009 10:39 pm

Lieutenant

Joined: Sun Jun 07, 2009 9:14 am
Posts: 4
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 picture.
.
Thanks.


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Jose Arrina
Post subject: Re: question about balun?Posted: Wed Sep 16, 2009 12:18 pm

Lieutenant


Joined: Thu Mar 30, 2006 9:01 am
Posts: 4
Hi Tiany:

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 purposes.

Sound reasonable?

_________________
... Jose' Arrina


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Tiany
Post subject: Re: question about balun?Posted: Thu Sep 17, 2009 8:09 am

Lieutenant

Joined: Sun Jun 07, 2009 9:14 am
Posts: 4
Thank Jose Arrina.
Do you know the impedance transform of the balun is 1:4 or 1:9?









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