On 1/31/2017 1:50 PM, Jim Brown wrote:
Last I looked, there was no description of the Elecraft "balun" telling
us what it is. Perhaps Eric or Wayne could add that to the catalog
listing for it.
The manual for the Elecraft BL2 shows exactly what it is:
http://www.elecraft.com/manual/BL2_Balun_Rev_B.pdf
Takes exactly 30 seconds to look at the schematic to see that the BL2
is a Rutheroff balun - two common mode chokes with the input in
parallel and the output switchable between parallel (1:1) and series
(4:1). Each pair of windings is roughly 100 Ohm line so the impedance
through the balun is a fairly good approximation of the desired value
in a 50 Ohm system.
73,
... Joe, W4TV
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