User's Manual

PINEAPPLE TECHNOLOGY, INC.
UT X1K W-A Ope rating a nd Se rvic e Ma nua l
2. Monitors Aural Power as a percentage of P-Sync rating (5-10 % typical).
3. Provides a HIGH ANTENNA VSWR MONITOR in the event of an antenna or coax failure where
the refl ected power exceeds 25% the transmitter will shutdown. Front panel LED will change from
green to red in case of a fault.
4. Provides current monitoring of all the pallets used in the two U600LDV2 power amplifi er assem-
blies. The current levels can be read directly from the multi-meter on the front panel. Individual
pallets are selectable. In normal operations, a PA FAULT is indicated by going from green to red.
RED indicates that the current level is below 500 ma and a transistor could have failed. To read the
actual current, select the appropriate PA Bank A1 or A2 where the fault is located and select the PA
with the selector switch. The multi-meter will read the actual current.
5. A PA INHIBIT switch is provided for failure diagnostic purposes. When activated, this switch
allows the technician to monitor the bias currents for each pallet. These readings should be recorded
when the transmitter is fi rst installed and used as a reference. This is the best way to trouble shoot
possible transistor failures. When in the PA INHIBIT mode, the RF PWR OFF LED will change
from green to red indicating that the “SHUTDOWN LINE” is at a TTL 0 state and the output power
has been reduced to near zero.
6. An RF MONITOR port (BNC) is available to connect a spectrum analyzer for monitoring the
output signal.
THE METER SELECTOR SWITCHES
A1 and A2 switches will select one of the two U600LDV2 amplifi ers located in the MFA1KW. A1 is the
amplifi er located in the left slot and A2 is located in the right slot when viewed from the front panel.
The Rotor Switch is the detail selector for the multi-meter. The various positions are defi ned as follows:
PA1 THROUGH PA5 Reads PA pallet currents as selected
Typical reading in INHIBIT MODE 1.5 TO 2 A
Typical reading SMPTE BARS 5-7 A for PA1 through PA4
Typical reading SMPTE BARS 2-3 A for PA5
PA6 NO CONNECTION
PS VOLTS Reads DC Voltage applied to PA Stages
Typical reading would be +29 to 32 VDC
P FWRD Reads PA output power in P-Sync percentage of rating.
Full power reading would be 100%
P RFLD Reads PA output power being returned from the load and
displayed as a percentage of forward power. Typical reading
would be < 5% indicated.
P AURAL Reads the AURAL POWER component as a percentage of
forward power. Typical reading would be 10%
AUX 1 & AUX 2 Not used in this confi guration
REFER TO SECTION VI.H (Page 39) FOR SCHEMATICS AND PARTS LIST
V T HEORY OF OPERATI ON
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