R.V.R. Elettronica PTRL-NV/S3, Technical Manual

Page: 33 / 171

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 31
PTRLNV/S3 - Technical and Maintenance Manual
Exemple: Band 840-860 MHz:
UP button pressed: 859.99 860.00 840.00 840.01
DOWN button pressed: 840.01 840.00 860.00 859.99
After the PLL has been locked for about 90 seconds, the display turns
off automatically.
To switch it on, press the ENTER button.
8) Having verified that the transmitter has locked into the desired
operating frequency by checking that the UNLOCK led is off, set the
switch so as to remove the short-circuit from between the two
conductors of the REMOTE cable.
The R.F. power output is now enable.
Adjust the power control PWR ADJ until maximum power is reached.
This will be about 2W (5 or 10W for special versions).
To make this measurement, ensure that the PWR ADJ led is on by setting
the meter switch (13 Fig.1) to the corresponding position and then
take the reading from the 10W FDS scale on the meter.
9) Using a small screwdriver or trimmer tool, rotate the PWR ADJ control
counter-clockwise, checking that the output power falls gradually
to a minimum of about 0,2W (1W for 5W version and 2W for the 10W
version).
Check the power reading against that of the bypass wattmeter (±10%).
10) Re-adjust the output power to 2W (or maximum power in the case of
the 5 or 10W versions) and select a new operating frequency at least
5MHz away from the current value.
On pressing ENTER, the UNLOCK led should light and the output power
fall to zero.
The power level should return to its previous value only when the
UNLOCK led goes out (oscillator locked to new frequency).
11) SWR protection check.
Disconnect the load from the R.F. output and check that the SWR led
comes on. The direct power reading on the unit's multimeter should
be about 50% of maximum (-3dB).
Check that the SWR led goes out and the power level returns to its
previous value when the load is reconnected.
12) Now short-circuit the REMOTE input and the power level should
immediately fall to zero.
Removing the short should result in the power output returning
gradually to its previous level.
13) Deviation meter check.
Set the modulation bar-graph display gain (4 Fig.1) to 100%.
Connect a low-distortion audio frequency generator to the MONO input
(10 Fig.2) or STEREO inputs (10-11 Fig.2).
Inject a 400Hz tone at a level of -10 dBm for the european version
or 0dBm (775mV RSM = 2.2V peak to peak) for the american version.