Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
coaxial line transformer - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: coaxial line transformer Posted: Sat Jul 04,
2009 3:27 am
Joined: Fri Jun 26, 2009 6:22 am
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:
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
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
Joined: Fri Feb 17, 2006 12:07 pm
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.
At bottom, life is all about
and blowing out.