[Milsurplus] Pi- Matching Network: When?

[C.Whitaker]

de WB2CPN
Are you asking about ham radios, or are you asking when
it was first used in any radios.  The Pi network has been
around since day one.   Before coax was practical, there
were only two ways to feed the transmitting antenna.  Either
balanced line, or a single wire.  Both needed L and C for
frequency adjustment, (Tuning), so the Pi was one of the
few ways to do it.
Looking back at a recent (?) use of the Pi, look at the BC-375
or BC-191 transmitters which predated WWII.   In the early '50's
my Stancor 203-A, (10 Mtrs only), had a Pi output.  The antenna
on the '52 Kaiser was a 102 inch (?) whip.
73  Clete
++++++++++++++++++++++++++++++++




On 2/7/2012 8:49 PM, David Stinson wrote:
> Anyone have any idea when the Pi output matching
> network appeared?
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