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PJ250-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 10
CHAPTER 1
GENERAL DESCRIPTION
1.1 EXTERNAL DESCRIPTION
The PJ250-NV is housed in a 3U 19" rack.
On the front panel the alarm indicators are placed in a central position,
the mains switch and the meter for the forward and reflected power.
On the rear panel the R.F. Input and R.F. Output connectors are located,
together with the interlock connectors, one of BNC type and one VDE
female, the main voltage input.
1.2 ELECTRICAL DESCRIPTION
The PJ250-NV is a power amplifier working on the 87.5-108 band with
an output power in excess of 250W and a drive level of about 20W.
This amplifier uses a RF module composed of four amplification stages
(MRF317 or SD1480), with a switching power supplies fixed with the RF
module on cooling ribs to obtain a high dissipation.
A built in low pass filter suppresses the harmonic contents below the
FCC and CCIR requirements.
A protection system protects the amplifier against thermal problems,
excessive input drive power and excessive SWR inside the amplifier or
along the feeder.
This system provides an automatic reset to initial conditions when the
problem ceases.
1.3 METERS AND INDICATORS
The forward and reflected power of the amplifier are read by the
analog multimeter (5 Fig.1) and selected by the selector (6 Fig.1) on
the front panel.
Various led (3 Fig.1) indicators indicate the alarm conditions caused
by thermal problems, excessive input drive power (4.Fig.1) and excessive
SWR.
A green indicator confirms the amplifier is operational (7 Fig.1).
1.4 PROTECTION CIRCUITS
The protection circuits put the amplifier in stand-by in the case
of a fault condition.
After 90 seconds the protection reactivates the amplifier if the fault
has disappeared.
If not, this process is repeated 4 times, at the end of which the amplifier
stays disabled for 15 min.; after 15 min, if the trouble persists, the
protection performs other four cycles and then disables the amplifier
indefinitely.
Содержание PJ250-NV
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