R.V.R. Elettronica PTX30-UHT, Инструкция по установке, техническому обслуживанию и ремонту, Страница: 37 / 171

PTX30-UHT Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 37
After about 1.5 minute from the LOCK condition, the display is
switched off, push ENTER to switch it on again.
8) 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 (10 Fig.1A, 6 Fig.1B) and read the value
on the 50W scale (f.s.d.).
9) 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%).
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 at 30W when the new LOCK condition happens.
11) AUTOMATIC POWER CONTROL CHECK
Become this check setting 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 the constant value of 15 Watt.
12) 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 led SWR (12 Fig.1A,
8 Fig.1B) glows.
This should happen with a reading of 6W.
Now, check that increasing the output power the reflected power do
not increase over 12W.
Reconnect the dummy load and verify that the SWR led goes off, the
meter indicate 0 reflected power and the forward power be 30W.
13) 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.
14)
DEVIATION METER CHECK
Set demodulation bar-graph gain (5 Fig.1A,1 Fig.1B) to 100%.
Connect a low-distortion audio frequency generator to the Mono input
(2 Fig.1A) or STEREO input (4 Fig.1A) for EUROPA version and Mono
input or MPX input (12 Fig.2B) for U.S.A. version.
Inject a 400Hz tone at a level of 0dBm for EUROPA and U.S.A. version.
Check that the bar-graf display (19 Fig.1A, 15 Fig.1B) lights up
to the first red led, indicating 100% deviation.
With the DOT/BAR switch (18 Fig.1A, 14 Fig.1B) in the BAR position,
all the green leds and the first red led should be on; in the DOT