R.V.R. Elettronica TEX150, User Manual

Page: 44 / 110

TEX150
38 / 40 User Manual Rev. 4.0 - 27/07/01
• Adjust trimmer R8 on METER card to read 150W on TEX150's analog meter.
Internal VSWR Adjustment
• Connect a 50 Ohm, 300 W dummy load to the RF output.
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• Turn trimmer R7, placed on Alarms card, completely clockwise.
• Disconnect external dummy load, increase output power until 150W turning
PWR ADJ trimmer clockwise.
Output power must increase slowly because the protection is working. (If this
doesn't happen, suspend all operation e contact the seller)
• Adjust R7 to obtain a reading of 10W on external wattmeter.
• Select with Meter Selector the REF position.
• Adjust trimmer R7 on METER card to read 10W on TEX150's analog meter.
External AGC Adjustment
• Perform the setups below (fig. 10.5 and 10.6).
figure 10.5
figure 10.6
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• This adjustment it's necessary when TEX150 is connected as exciter or driver
for a power amplifier. Therefore, it's necessary to have on last amplifier of the
system an output voltage proportional with antenna output forward power and
connect this signal to REMOTE1. Increase TEX150's output power with PWR
ADJ to have the necessary output power to drive the next stage of the system
(e.g. for a 1KW amplifier, read 1050W on external wattmeter).
• Turn trimmer R16, until to have maximum output power of the power amplifier
on external wattmeter (e.g. 1000W). In these conditions is possible to control
output power into the range of 50W presetted, protecting the equimpment
against voltage variations).