R.V.R. Elettronica PTX30 UHT/S3, User Manual

Page: 17 / 122

PTX30 UHT /S3
11 / 36 User Manual Rev. 5.0 - 10/12/2001
Note that if you push the UP and DOWN switches momentarily, you move the last
digit one step each time, if you keep the switch pushed the digits change
continuously.
When the display reaches one extreme of the frequency it range jumps automatically
to the opposite extreme.
E.G.: 108.00—87.5—87.51
87.50—108—107.99
After about 1.5 minutes from the “LOCK” condition, the display is switched off;
push “ENTER” to switch it on again.
After the “LOCK” condition is verified, (“UNLOCK” indicator off) open the switch
previously connected to the “REMOTE” input, enabling the RF output, you should
read 3 Watt of output power.
To make this reading, check that the “PWR/FWD” led is on, if not use the measure
selection switch and read the value on the 50W scale (f.s.d.).
With a small screwdriver turn the “PWR ADJ” pot clockwise to obtain a gradual
increase of the output power to a maximum of 30 Watt (check this value also on
the through wattmeter for a tolerance of +/- 10%).
Leaving the power set at 30 Watt, make a large change of frequency (7 or more
MHz).
When the “UNLOCK” indicator comes on the output power drops to 0 and returns
to 30W when the new “LOCK” condition occurs.
Automatic power control check
Select a frequency of 87.5 MHz and an output power of 15 Watt.
Moving the frequency in steps of 5 MHz verify that the output power
maintains a constant value of 15 Watt.
SWR protection check
For this check set the output power at the minimum value, disconnect the dummy
load and position the internal meter on the “PWR REF” reading. The meter should
read about 2-3 W.
NOTE: The scale is 10W f.s.d..
Slowly increase the output power until the “SWR” led lights. This should happen
with a reading of 6W.
Now, check that increasing the output power, the reflected power does not exceed
12W.