Whoa, let's reign back here a bit. The test was still for a 200-ohm
load, but it was made asymmetric (150-ohms and 50-ohms) in order to
accomodate the 50-ohm network analyzer. The 6dB loss is a result of the
voltage at the test port being Vin/2, but the voltage at the other output
port with the 150-ohm resistor is 3Vin/2, so there is no excessive loss
through the balun. In actuality, there is less than 0.1dB of power loss in
the prototype that I made. The test was made to determine if the balance
was correct.

Chris

,----------------------. High Performance Mixers and
/ What's all this \ Amplifiers for RF Communications
/ extinct stuff, anyhow? /
\ _______,--------------' Chris Trask / N7ZWY
_ |/ Principal Engineer
oo\ Sonoran Radio Research
(__)\ _ P.O. Box 25240
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Graphics by Loek Frederiks

"Richard Clark" wrote in message
...
On Mon, 27 Jun 2005 05:16:08 GMT, "Chris Trask"
wrote:

The low frequency
3dB point is around 600kHz and the high frequency 3dB point is beyond
500MHz.

Hi Chris,

If this relates in some way to your published return loss
characteristic, then I have to offer that it is hardly representative
of the best of BalUns to offer. Sevick offers at least half a dozen
with scads less loss and operating flat to within less than a fraction
of a dB.

Now by your tying in an implicit BW from 600KHz to 500MHz, this comes
too close to brightening your teeth and improving your sex life.
Within 3dB? Given your design, and it being voltage based, supporting
flux through currents driving the core, 3dB would be a hell of a dummy
load and hardly a crowning achievement.

73's
Richard Clark, KB7QHC