Honeywell KHF 1050 System Installation Manual page 132

7.D. SWR and Power Measurement Procedures
The following information is provided as an aid, in the event transmitter problems
are encountered during post-installation testing.
A SWR/wattmeter can be connected between the KPA 1052 Output (J10527) and
the KAC 1052 Input (J10523) to check the RF output power and to verify the
Antenna Coupler is finding a good tune. J10527 should connect to the wattmeter
input and J10523 to the wattmeter output.
It is important to use a wattmeter that is capable of operating as either an
average-reading wattmeter or peak-reading type. Average-reading wattmeters will
not give accurate indications of transmitter power in the SSB modes. The
average-reading mode is preferred for some measurements, such as during
antenna coupler tuning.
To observe the power and SWR during the Antenna Coupler tuning process, set
the wattmeter to the average-reading mode. When the Antenna Coupler is tuning,
a forward power of 10 to 50 watts will typically be observed. During the tuning
process, both the SWR and RF power will vary. The tuning sequence will stop
when the antenna coupler finds an acceptable tune, or determines a tune cannot
be found.
Once the antenna coupler is tuned, a forward power of typically 200 Watts
Peak-Envelope-Power (PEP) will be observed on USB voice transmissions if the
controller is set to MAX power. It is important that the wattmeter be set to the
peak-reading mode for measurements utilizing voice modulation. 100 or 50 Watts
PEP will be observed if the controller power setting is MED or MIN respectively.
The SWR reading should be 2.5:1 or less. When transmitting in USB voice with no
one speaking into the microphone, the power should be near zero. Similar power
readings will be observed in LSB voice. If operating in Reduced Carrier (RC) mode,
similar readings will be observed, however significant output power will be read
with no modulation.
In AM mode, a carrier power of approximately 50 Watts will be observed with no
modulation, and 200 W PEP or slightly less with voice modulation. This power will
be observed regardless of the power setting on the controller. When using the data
modes, the power observed will be highly dependent on the type of modulation
used. The wattmeter's peak-reading mode is typically used for measuring the
power with data modulation.
Revison 2
N
KHF 1050 SYSTEM INSTALLATION MANUAL
23-10-09
Page 2050
Apr/2006