User's Manual

PINEAPPLE TECHNOLOGY, INC.

UTX5K ULTRA-2 Operating and Service Manual

V -- THEORY OF OPERATION

(CONTINUED) Page 5 of 5

J. UC6KWN 6-WAY COMBINER

The UC6KW is an 6-Way in-phase combiner. The combiners are specifically designed

for the channel designated transmitter frequency. This is a closed unit and cannot be serviced.

SEE SECTION Vl.G. FOR PARTS LIS

K. BPU10K UHF BAND PASS FILTER

This Band Pass filter was designed to meet FCC Certification requirements with minimum loss of

RF Power. The BPU10KW comes tuned and tested to the operating frequency of the transmitter

and should no be adjusted without proper equipment. Replacement filters are available as

P/N BPUKW UHF (+CHANNEL NUMBER).

L. DC7KW DIRECTIONAL COUPLER

The DC7KW Directional Coupler provides for insertion monitoring of forward and reflected RF

power, between the output combiner and the bandpass filter, and is sent to the ADP500 for display.

M. AUX MONITOR PANE

The auxiliary monitor panel provides analog meter measurements for the primary DC supply. The

total power supply current and voltage are displayed on these meters. These measurements serve

as a good indication of the operation of the transmitter final power amplifiers.

Each power supply has a current monitor output. These outputs are accessible on the AUX5 front

panel. Each (PS I Share) test point will indicate a relative amount of current being supplied from the

power supply. This is not a calibrated or accurate measurement that is scaled from the current

capability of the power supply. This is also a second-level diagnostic tool for use by qualified

technicians.

In the event of an EMERGENCY, a SHUTDOWN SWITCH located on the AUX5 will shut down the

transmitter and remove all power starting from the MAIN 3-P BREAKER. To turn the transmitter

on, it is necessary to RECYCLE the SHUTDOWN SWITCH before the transmitter MAIN BREAKER

can be turned on.

N. FP6 FUSE AND SHUNT PANEL

The FP6 serves as a DC SUMMING POINT for all current coming from the power supplies. After being

summed, the current passes through a 1000 AMP precision shunt which is used for measuring the total

supply current and voltage being applied to the transmitter power amplifiers. At this point, the DC power

is distributed to each PA1K amplifier assembly through a series 125 amp fuse.

NOTICE: BEFORE ANY SERVICE WORK IS PERFORMED ON THE FP6 ALL POWER TO THE

TRANSMITTER MUST BE TURNED OFF

FOR SAFETY.

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