On 11/20/2015 6:31 PM, Daniel Danny Horvat wrote:
BTW I own an old HP/Agilent 8711 network analyzer and would love to here how
would you measure insertion loss of 4:1 (200:50) TLT with any network
analyzer? Enlight me please.
Not with just "any network analyzer", like the 8711; you need a 4 port
network analyzer, such at the Agilent E5071C with 4 port option.
I've measured many baluns with one of those. Gives common mode
and differential mode s parameters, with programmable Zo for
each port. Also measures imbalance. The Agilent software will walk you
through the set up.
Second, your proposal of better 4:1 BALUN for OCF antenna involving 4:1
balanced transformer in cascade with current 1:1 BALUN is impractical, given
the fact that broadband 3-30MHz balanced transformer will always have more
insertion loss than simple 4:1 transmission line transformer formed with two
separate 1:1 current BALUNS.
My homebrew broadband 1.8-54 MHz 9:1 transformer has very low insertion
loss. If it didn't, it wouldn't be able to handle 1.5 kW without over
heating. Has worked for me for many years.
73
Rick N6RK
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