Harris Broadcast Flexiva FAX 10KW, Technical Manual

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FAX 5/10/20/30/40KW
October 28, 2013
5 ‐ 21
888 ‐ 2720 ‐ 001 WARNING: Disconnect primary power prior to servicing. Copyright ©2013, Harris Broadcast
5.7.7 Backup Control Mode Power Setting
In the event that the Micro Module would fail the transmitter will revert to backup control. In backup control the
power control reference from the mirco is lost and the potentiometer on the System Interface Board or Multi ‐ Unit
Interface in FAX20/30/40, becomes the power reference. This pot can be set to the full range of the transmitter RF
power capability. This pot is set at the factory to the customer TPO on the sales order. If adjustment is required it
is not necessary to take the transmitter off air.
STEP 1
On the System Interface board or the Multi ‐ Unit Interface on the FAX20/30/40, set the
Normal/Backup switch to Backup. Red Backup Mode LED should be on
STEP 2
Adjust the PWR SET located on System Interface board or the Multi ‐ Unit Interface pot to
desired power
STEP 3
Set the switch back to Normal. Red Backup Mode LED should be off
5.7.8 UPS Mode Power Setup
User Remote J1 Pin 8 on the rear of the transmitter, Power Block 1 in FAX20/30/40, sets the FAX into the UPS mode.
This line would typically come from a UPS or a AC Mains generator to set the transmitter to a power out at a point
that the generator was capable of supplying enough power without being overdissapated. It also can be used in the
event the transmitter needed to be turned down in power to do maintenance on the system or antenna.
STEP 1
With the transmitter ON, ground pin 8 of User Remote J1. This must be a continuous
ground
STEP 2
If this has not be filed set the transmitter should drop to about 25 % power and System
LED should be yellow.
STEP 3
Using the Raise/Lower buttons on the front panel, set the power to desired level. If this
point is below the RF Output Warning/Fault Threshold settings you will get an alarm.
STEP 4
Remove ground from J1 ‐ 8 and transmitter should return to normal power out
5.7.9 IPA Bypass FAX 5/10 Only
If a situation ever arises where the IPA system must be bypassed, there is a convenient way to feed the Exciter RF
output directly to the input of the 2 ‐ way divider that feeds the PAs. This bypasses not only the IPA but also the RF
Switch board. Depending on the exciter it may not be able t o output enough power to reach the TPO, however the
transmitter will be on the air.
STEP 1
Depress front panel "OFF " button and open front door.
STEP 2
Before connecting the exciter to J4, ensure its RF level is set to about 5 watts.
STEP 3
Remove the coax on J4 BNC and connect the exciter RF output to J4.
STEP 4
Un mute the transmitter and exciter. Raise the exciter power until the transmitter is back
to its TPO or 60 Watts which maximum safe power into the splitter.