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Question About Balun? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

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


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.


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


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


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


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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