Pineapple Technology VTX2KW-A, Instruction Manual, Page: 12 / 49

PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
I. V600LDV2 POWER AMPLIFIER
The V600LDV2 is the main RF Power Amplifier Assembly used in the VTX2KWA. Each Ampli-
fier assembly is made up of five (5) VH200LD power pallets. Each power pallet uses two (2) Phillips
BLF
647
power LDMOS FETs. These amplifiers are operated in Class A/AB or sometimes referred to as
“HARD AB”. This refers to the bias levels to achieve best linearity.
Each V600LDV2 amplifier assembly includes the following:
5 each ................................................................... VH200LD power pallets
1 each ................................................................... 4-way splitter
1 each ................................................................... 4-way combiner
1 each ................................................................... Pwr distribution module (1A0025)
2 each ................................................................... thermal sensors
1 each ................................................................... remote monitor port (DB9)
1 each ................................................................... front panel status port (Molex)
1 each ................................................................... filtered DC input port
1 each ................................................................... Type N panel mounted RF Input port
1 each ................................................................... Type N Panel mounted RF Output port
SEE SECTION VI.D. FOR SCHEMATICS AND PARTS LIST (page 21)
J. VC2KW-4 POWER COMBINER WITH COUPLER
The VC2KW-4 is a 4-way in
-
phase combiner with built in 40 dB dual directional coupler.
This assembly has no user servicable parts.
K. BPV2KW VHF BAND PASS FILTER
This Band Pass filter was designed to meet FCC Certification requirements with minimum loss of RF
Power. The BPV2KW comes tuned and tested to the operating frequency of the transmitter and should not
be adjusted without proper equipment. Replacement filters are available as P/N BPV2KW VHF
(+CHANNE
L NUMBER).
This assembly has no user servicable parts.
V — THEORY OF OPERATION
Page 11