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Look for the lowest SWR on the Radio or Analyzer. A typical reading would be: Approximately
1.4:1 SWR at approximately 1.885 MHz. If you don’t see an SWR dip look higher or lower in
frequency and adjust the top hat and length of the vertical to get the SWR dip approximately as
shown in the SWR graph.
Move the shorting lead on the
Series Coil
to about the middle turn. A typical reading would now be
approximately 1.5:1 SWR at approximately 1.800 MHz
To raise the Resonant Frequency, adjust the
Series Coil
shorting lead to short out more of the coil.
To lower the Resonant Frequency, adjust the
Series Coil
shorting lead to short out less of the coil.
Adjust the
Shunt Coil
to achieve the lowest
SWR. This may cause the Resonant
Frequency to change slightly since the 2 coils
interact somewhat.
Readjust the
Series Coil
to arrive at the
frequency where you wish to have the lowest
SWR.
A typical final reading will be approximately
1.2:1 SWR at 1.824 MHz.
Once final tuning is complete and you have
verified correct operation on-the-air, the coil
taps can be soldered in place to eliminate any
future intermittent connections due to
environmental corrosion to the coil taps and
coil wire connections.
Typical
SWR
Graph
