Instruction Manual

6X Series Liquid-Cooled Transmitter Chapter 3, Installation, Set Up and
Problem Identification Procedures
Instruction Manual, Rev. 0 3-8
Switch Position 6 must be switched ON (0) which allows the user to modify the AGC
1 and AGC 2 gain through the Axciter Modulator.
On the Axciter Upconverter Screen, set AGC 1 to 1.5 Volts, by selecting 4 on the key
board entry. This will cause a detail screen to appear prompting you to enter a
number value. Monitor the AGC 1 Gain Value on the screen and increase or decrease
the value of the number entered until the monitored reading is 1.5 Volts.
3.6.2.4: Setting up of AGC 2
On the Axciter Upconverter Screen, set AGC 2 to 1.7 Volts, by selecting 5 on the
keyboard entry. This will cause a detail screen to appear prompting you to enter a
number value. Monitor the AGC 2 Gain Value on the screen and increase or decrease
the value of the number entered until the monitored reading is 1.7 Volts.
After the setting up of the AGC, the AGC must be de-activated to prevent accidental
changes. The Upconverter DIP Switch SW1 Position 6 must be switched OFF (1)
which locks the AGC 1 and AGC 2 gain.
3.6.2.5: Setting up of Overdrive Threshold
On the Axciter Upconverter Screen set the Overdrive Threshold to 1.6 Volts, by
selecting 7 on the keyboard entry. This will cause a detail screen to appear.
Increase or decrease the voltage as needed until the monitored reading is 1.6 Volts.
Place the Transmitter into AGC by pushing the 3 of the keyboard entry on the Axciter
Upconverter Screen. This will place the Transmitter AGC into Auto.
3.6.2.6: Axciter Pre and Post Filter Sample Values
Pre and Post RF samples are connected to the rear panel of the Exciter Driver tray.
These levels should be measured with a power meter before connecting them. Your
installation may require RF attenuators to be placed in line with the samples to get
them within the desired range.
J17 on the Exciter Driver Tray is the connection to the Forward power sample of
the coupler before the mask filter, Pre-Filter Sample.
The Level into the Relay at J1 or the Upconverter Tray at J17 should be 0 dBm to
–10 dBm, –5 dBm typical.
J16 on the Exciter Driver Tray is the connection to the Forward power sample
after the mask filter, Post-Filter Sample.
The Level into the Relay at J2 or the Upconverter Tray at J16 should be 0 dBm to –
10 dBm. –5 dBm typical, but within .5 dB of the Pre-Filter sample.
3.6.2.7: Exciter Driver Adjustment
On the Axciter Modulator, activate the Upconverter Main screen by selecting
Upconverter using the button next to it on the right side of the Axciter Main Screen.
Activate the Downconverter Output Gain by pushing 2 on the key board entry.
Monitor the DTVision Linear Display by pushing the button next to the DTVision
Linear display on the right side of the Axciter Main Screen. At the bottom of the
DTVision linear screen, locate the reading next to RMS. If this reading is between –