Because:
a) It's a voltage balun and therefore will drive *unequal* currents into
anything except a perfectly balanced load. A voltage balun has *zero*
common-mode impedance.
b) Its a 4:1 balun; so, used with a doublet/ladderline combination, it
will typically cause higher tuner losses for a large range of feeder
lengths than would a 4:1. See:
http://www.karinya.net/g3txq/tuner_balun/
I use a good 1:1 current balun external to my 238 tuner with my
doublet/ladderline system.
Steve G3TXQ
On 11/07/2013 21:20, Mike Bryce wrote:
Why not use the internal balun in the 238?
Sent from my iPhone
On Jul 11, 2013, at 3:00 PM, "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de> wrote:
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