R.V.R. Elettronica PTX30 UHT/S3, Руководство пользователя

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PTX30 UHT /S3
12 / 36 User Manual Rev. 5.0 - 10/12/2001
Reconnect the dummy load and verify that the SWR led goes off, the meter indicates
0 reflected power and the forward power is 30W.
Close the switch on the REMOTE input and verify that the output power drops
immediately to 0.
Opening the switch, the power will gradually return to the previous value.
Deviation meter check
The maximum input sensitivity of the meter is selected by the “INPUT LEVEL”
switch and in the -12/+9 position will depend on the setting of L/mpx and R/mono.
Place the meter f.s.d. selector (4 Fig.1) on 100%.
Connect a low distortion audio signal generator to the inputs “LEFT” and “RIGHT”.
figura 5.2
Inject a 400 Hz tone with 0 dBm amplitude (0.775 VRMS or 2.2 Vpp).
Set the “INPUT LEVEL” control at 0 dBm.
Place the switch in the stereo position (the appropriate indicator will light).
Set the “PILOT” switch on (the indicator will light).
With the selector allow the “R/MONO” led to light and verify the 0 dB reading on
the +3 dB f.s.d. scale.
Repeat the operation for the “L/MPX” led.
Check the indication of the bar graph led; it should be indicate 100% (first red led
lit).
Depending on the “DOT/BAR” switch position, you will see just the red led on
(DOT) or all the green LEDs and the first red (BAR).
Now disconnect the signal generator and placing the selector on 10%, verify that
on the bar-led indicator, the first red led is on.
This 10% level is caused by the 19KHz internal stereo coder’s pilot tone.
Switch off the “PILOT TONE” and all the LEDs will go off.