D Plot Measurement - Icom IC-905 Advanced Manual

8
OTHER FUNCTIONS
Measuring SWR

D Plot measurement

You can measure the SWR over the entire set
frequency range�
1� Set the desired frequency band�
2� Set the RF power�
3� Display the SWR GRAPH screen�
» SWR
4� Set the center frequency for the SWR to measure�
(Example: 145�000�00)
5� Touch [STEP] several times to set the measuring
step, or touch [BAR] several times to set the
number of graph bars�
Center frequency
L You can select between 10, 50, 100, and 500 kHz
measuring steps�
L You can select between 3, 5, 7, 9, 11, and 13 graph
bars�
6� Touch to start measuring�
• Displays the frequency marker "▲" and the
measurement frequency�
NOTE: Before transmitting, monitor the
operating frequency to make sure you will not
cause interference to other stations on the same
frequency�
7� Hold down [PTT] to transmit�
• The bar graph displays the SWR�
L When the Break-in function is ON in the CW mode,
you can use a straight key or paddle to transmit�
Frequency marker
Measuring SWR
8� Release [PTT] to stop transmitting�
9� Repeat steps 7 and 8 to measure the SWR over
TIP:
• Rotate
• "<<" (low) or ">>" (high) is displayed when the
• Touch [RECALL] for 1 second to move the frequency
Measuring step
• Touch the bar graph to delete the measured SWR�
Number of
graph bars
Measurement
frequency
8-4
L When using a straight key or paddle, stop keying�
the entire frequency range�
The center frequency is displayed
after the measurement
to move the frequency marker "▲" to
the current transmit frequency�
transmitted frequency is out of the displayed range�
marker "▲" back to the center frequency.
The best match is
within this range�
(1�5 or less)