[Johnson] Antenna matching- Viking II/Matchbox vs. short dipole

Rich Soennichsen rsoennichsen at gmail.com
Tue Oct 23 13:56:43 EDT 2007


Hi All,
     I finally have my Viking II on the air.  This after I was unable
to tune my 40m dipole until I added some length to it.  (For 75m)

I am concerned about the output coupling though.  The dipole is still
short for 75m.  When I tune up the Viking I get to ~200 mA of plate
current on the first main coupling setting.  When I tune on 40m I keep
increasing the coupling to four or five as I would expect.

I can increase the coupling one notch if I diddle with the Matchbox,
basically increasing the SWR to drop the plate current.  It seems to
me I can then increase the coupling setting on the transmitter but
maybe only to heat up my feedline.

Does it seem reasonable to hit the desired plate current on the lowest
output coupling setting?

thanks

Rich
W7SOE


More information about the Johnson mailing list