Specifications

5/9/13 888-2857-001 3-13
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
% of Fwd Pwr
Reference
Set the percentage of actual transmitter output power. (Valid range 0 - 100%)
If the Fwd Power Reference = 1000W, and the % of Fwd Pwr Reference =
75%, then the actual forward power reference will be 750W.
Fwd Power
Reference
Set the desired forward power of the transmitter in watts (W). The Fwd
Power Reference setting is limited by the Nominal Power Output setting, thus
the valid range for this control is 0 - Nominal Power Output (W).
Reflected Power F/B This is the level of reflected power in watts (W) that if exceeded will activate
power foldback. (This is a status only field).
Foldback Percentage that System Output Power is currently being folded back due to
presence of high reflected power conditions.
Foldback Threshold
(Fwd %)
This level represents the percentage of reflected power that can be tolerated
before initiating foldback. The level can be set from 1 to 4%. Four percent is
the maximum reflected power setting allowed (approximately 1.5:1 VSWR). A
reflected power level of 1% corresponds to a 1.22:1 VSWR. A system
foldback threshold setting of 4% means that reflected levels greater than 4%
would initiate a foldback of transmitter output power.
Maximum Foldback: This is the maximum amount of foldback allowed. Maximum Foldback can be
set between 50 and 100%. Power foldback occurs when the Foldback
Threshold, described above, is reached or surpassed.
Foldback allows the transmitter power amplifier(s) to operate at a safe
(reduced) output power level when high VSWR conditions occur. A 100%
foldback level means the power out of the transmitter would be zero. A 50%
foldback level would reduce the transmitter output power to half power.
Foldback Release TC
(s):
This is the amount of time, in seconds, that the control system waits after
foldback is activated before attempting an output power increase step. The
range is 5-120 seconds.
Softkeys
Xmtr Home Displays the Xmtr Home screen.
Cal Displays calibration screen as shown in Figure 3-10.
Exciter Home Displays the Exciter Home screen.
Table 3-6 Xmtr Home>Config
Field Explanation