V10/V7.5/V5/V3.5 Installation and Operation Manual Page 2-11
Section 2 Preparation for Use and Installation Issue 3.5
2.2.13.4 Main IPA Power Supply
Selection
(For V5/V3.5 transmitters only) The main
IPA power supply selection circuit selects
which IPA power supply is enabled as the
main IPA power supply. It comprises an A
(J6-27/28) and a B (J6-29/30) circuit. This
function is ganged together with the main
IPA selection (2.2.13.3).
2.2.13.5 Main Fan Supply Selection
The main fan supply selection circuit
selects which fan supply is enabled as the
main fan supply. It comprises an A
(J4-29/30) and a B (J4-31/32) circuit.
2.2.13.6 Preset Power Level Selection
The power level selection circuit selects
one of six preset RF power levels/modes.
It has six switching circuits [Preset 1
(J4-2/3), Preset 2 (J4-4/5), Preset 3
(J4-6/7), Preset 4 (J4-8/9), Preset 5
(J4-10/11) and Preset 6 (J4-12/13)].
2.2.13.7 Power Level Adjust
The power level adjust circuit controls the
RF output level in an increasing or
decreasing direction when the appropriate
input is applied and removed. The circuit
comprises an increase (TB4-7/8) and a
decrease (TB4-9/10) circuit. The size of
the change depends on the operating
mode and the duration of application time.
In analog (FM) mode, a temporary (pulse)
application causes a 100 W (V10/V7.5) or
50 W (V5/V3.5) change. A three-second
or longer application causes a 1,000 W
(V10/V7.5) or 500 W (V5/V3.5) change.
In hybrid (FM+HD) or all-digital (HD)
mode, a temporary (pulse) application
causes a 1% change based on the
transmitter’s rated power level [for FM+HD
mode, 75 W (V10), 55 W (V7.5), 37 W
(V5) or 27 W (V3.5); for HD mode, 30 W
(V10), 20 W (V7.5), 15 W (V5) or 10 W
(V3.5)].
A three-second or longer application
causes a 10% change [for FM+HD mode,
750 W (V10), 550 W (V7.5), 370 W (V5)
or 270 W (V3.5); for HD mode, 300 W
(V10), 200 W (V7.5), 150 W (V5) or
100 W (V3.5)].
2.2.13.8 System Reset
The remote reset circuit (TB3-11/12)
resets any alarm circuit that is or was
latched in its alarm state.
2.2.14 Serial Port
The transmitter’s remote interface PWB
(A44) has an RS232 serial interface port
(9-pin D-sub connector J8) to allow
remote control and interrogation of the
transmitter’s operational status. A remote
protocol specification is available from
Nautel. The application must be written by
the end user based on protocol.
NOTE
If the optional NxLink Ethernet interface
module is used (see 2.2.21.10), A44J8 is
linked to Port 1 of the NxLink module and
the NxLink module is used as the remote
interface.
2.2.15 RF Performance Monitoring
The transmitter provides outputs to
monitor RF performance. They include dc
voltages representative of the forward and
reflected power levels, dc voltage applied
to the RF amplifiers, exciter forward
power, intake and exhaust air temperature
and total PA current. These outputs are
available on the remote interface PWB. In
addition, RF samples of the RF output and
the active IPA output(s) are available for
external monitoring. Unless otherwise
noted, all remote interfacing is made to
the remote interface PWB (A44).
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