Technical Manual
PINEAPPLE TECHNOLOGY, INC.
UTX3KW-A Operating and Service Manual
G. DRV100DC-2 DRIVER
The output power of the modulator is applied to the input of the DRV100DC-2 driver. This amplier
increases the drive level to that required for the MFA1KW to make rated power. The driver amplier
requires 31 VDC to operate and does not require any tuning or adjustments to change channels.
REFER TO SECTION VI.C. (Page 19) FOR SCHEMATIC AND PARTS LIST.
H. S10-6 SPLITTER
The S10-6 SPLITTER is a 6-way in-phase broadband splitter. This splitter provides an equal split of drive
power to each U600LDV-2 power amplier.
SEE SECTION VI.F. (Page 37) FOR PARTS LIST
I. MFA1KW PA HOUSING
The MFA1KW is the main RF Power Amplier housing which accommodates two (2) U600LDV-2
Ampliers. The housing includes the following:
2 ea. 330 CFM cooling fans
2 ea. Air lter assemblies
2 ea. Front panel status PC boards
1 ea. Main chassis
2 ea. Mechanical slide assemblies
1 ea. AC Filtered inlet for cooling fans
SEE SECTION VI.D. (Page 21) FOR SCHEMATICS AND PARTS LIST
J. U600LDV-2 POWER AMPLIFIER
The U600LDV-2 is the main RF Power Amplier Assembly used in the UTX3KW-A. Each Amplier
assembly is made up of ve (5) U250LD power pallets. Each power pallet uses two (2) Philips BLF861A
power LDMOS FETs. These ampliers are operated in Class A/AB or sometimes referred to as “HARD
AB”. This refers to the bias levels to achieve best linearity.
Each U600LDV-2 amplier assembly includes the following:
5 ea. U250LD power pallets
1 ea. 4-way splitter
1 ea. 4-way combiner
1 ea. phase & gain matching circuit (1A0018)
1 ea. Power distribution module (1A0025)
1 ea. high power isolator
3 ea. thermal sensors
1 ea. remote monitor port (DB9)
1 ea. front panel status port (Molex)
1 ea. ltered DC input port
1 ea. Type N panel mounted RF Input port
1 ea. Type N Panel mounted RF Output port
SEE SECTION VI.E. (Page 25) FOR SCHEMATICS AND PARTS LIST.
V — THEORY OF OPERATION
Page 13