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Coaxial Line Transformer - RF Cafe Forums

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

Post subject: coaxial line transformer Posted: Sat Jul 04, 2009 3:27 am


Joined: Fri Jun 26, 2009 6:22 am
Posts: 13
I am designing a 200W, IMD3< -40dBc amplifier for 30-90MHz application, I am going to using freescale's MRF6VP2600HR6.The following is test circuit:

I want to ask three quentions:
1.There are two baluns(T1 and T2) , they are coaxial line transformers, is there anyone known the parameters of these baluns(length and Zo)? (Baluns are made by Comm Concept, and I have email Comm Concept company, but they didn’t reply me)
2.Since the Comm Concept company didn’t reply me, is there any other products I can use to substituted for T1 and T2?
3.Maybe I have to make it myself, can you give me some reference on how to make a balun like these?


Post subject: Re: coaxial line transformerPosted: Mon Jul 06, 2009 3:33 am


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
You will find info on balun requirements in some Motorola Application Notes. Siliconix also had App Notes once in a while that were a great help in understanding how to design input/output matching sections for bipolars and FETs.

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