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:
matching 2 sources to 1 antenna - 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: matching 2 sources to 1 antenna Posted: Wed
Jun 21, 2006 2:20 pm
Joined: Thu May 18, 2006
I have two 50 Ohm sources, 190 MHz and 160 MHz,
10 dBm. I want to connect both sources to one lambda/4 antenna (center
frequency = 175 MHz) to transmit the two signals at the same time. Do
I need something like a directional coupler because I want a high isolation
between the two sources? In addition, I need a matching circuit for
both sources. Does anyone have an idea what type of circuit design will
be the best choice for this application?
Thank you for your help.
Post subject: Posted: Wed Jun 21, 2006
Joined: Tue Apr 11, 2006 8:13 pm
You could use a directional coupler or a Wilkinson power divider,
though at 175 MHz, it might be quite big.