Marti Electronics SRPT-40A User Manual page 27

Refer to the Control Switch Settings Command (Figure 5) for disabling or enabling the desired controls. Remove
the top cover. Set the internal dip-switch S1 switches and the FREQUENCY SELECT pushwheel decimals as outlined
in Figure (5). The entries in bold italics are default settings from the factory. Notice that in some cases, some settings
can be achieved by more than just one unique decimal entry. For example, if it was required to disable the Rotary Pot
Power Adjust, enable VSWR Foldback, and enable Reverse Power Calibration, DECIMAL 4 could be set to a "1" or a
"9" and achieve the same settings. Or if it was required to disable Forward Power Calibration and enable Hi
Temperature Shutdown, DECIMAL 3 could be set to a "0", "1", "8" or "9".
When all FREQUENCY SELECT pushwheel decimals have been set to their required values that correspond to the
desired control switch settings, you must send the command by pressing the EXECUTE pushbutton down and then
releasing. The internal controller will set the controls. Set the internal dip-switch S1 back to it's normal position with
switch 1 and 2 "ON" and switch 3 and 4 "OFF". Re-install top cover.
Following is a description of the control settings:
Rotary Pot Power Adjust Enable – The default for this setting is "yes" which allows the user to change the power
from almost 0 Watts to the maximum RF output power setting via the front panel POWER ADJUST pot. Refer to the
Maximum Power Setting paragraph in the CALIBRATION AND ADJUSTMENT section of this manual for
information on how to set the maximum power. If this user selects "no" for this setting, then the RF output power will
maintain where last set and tuning of the POWER ADJUST pot will have no effect.
VSWR Foldback Disable – The default for this setting is "no", therefore the VSWR Foldback is enabled. This
means when a VSWR is detected greater than 4, the power will limit to 25 Watts maximum. If "yes" is chosen, to
disable VSWR foldback, then the forward RF power will not try to foldback, even when the controller detects a VSWR
of greater than 4. The HIGH VSWR LED will still flash however. For maintaining long life from the power amplifier, it
is not recommended to disable VSWR Foldback.
Reverse Power Calibration Enable – The default setting for this setting is "no". This setting should only be selected
"yes" during calibration (see the Reverse Power Calibration paragraph in the CALIBRATION AND ADJUSTMENT
section).
Forward Power Calibration Enable – The default setting for this setting is "no". This setting should only be
selected "yes" during calibration (see the Forward Power Calibration paragraph in the CALIBRATION AND
ADJUSTMENT section).
High Temperature Shutdown Disable – The default for this setting is "no", therefore High Temp Shutdown is
enabled (see High Temp LED paragraph in the CONTROL & CONNECTOR FUNCTIONS section for complete
description). If "yes" is chosen, then the power amplifier will not shutdown due to high temperature but the HIGH
TEMP LED will still flash. Again, for maintaining long life from the power amplifier, it is not recommended to disable
High Temperature Shutdown.
Direct Frequency Change Enable – The default for this setting is "yes" to be able to change the output frequency
direct. If "no" is chosen, then attempting to change the output frequency will be ignored by the internal controller. This
setting is useful for allowing only certain frequencies to be transmitted by selecting from pre-stored channels.
Channel Frequency Change Enable – The default for this setting is "yes" to be able to change the output frequency
by channel select. If "no" is chosen, then attempting to change the output frequency by selecting channels will be
ignored by the internal controller. This setting is mainly useful if the Direct Frequency Change setting is also disabled.
Therefore, only one frequency can ever be transmitted.
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