HF PACKER
AMP
V4R6
Page 50
residue where the SIL-PADs are placed. It is important when
installing the MOSFETs that the metal face of the MOSFET is
flat against the pad and not be under strain with the AMP
board connections. The construction manual suggests a
procedure to follow when installing MOSFETs.
HFPA FILTER MODULE 12
To follow the circuit explanations, turn to the HFPA Filter
Module schematic. This design uses Relay selection of the RF
input and a rotary switch for RF output selection. The switch
operates a single low pass filter path at a time. All other filter
circuits have shorted inputs while not in use for minimal
interaction between adjacent circuitry. The relay input
selection provides a high degree of isolation and improved
filter overall performance. All of the HF bands are selected
with 6 choices from the front panel switch. It is very important
that the filter choice equal the band of operation. For instance
operating on 15M with the filter set to 80M is a recipe for
MOSFET failure. There is no interlocking or cross checking
provided except by the alert operation of the user.
J1, Filter Input
The AMP output is received at J1 and is routed to the circuitry
of one LP filter circuits through relay K1-K6.
J2, Filter Output
The selected filter circuit output is routed through the contacts
of SW1 to J2. Note that 12V is also on J2. This is the operating
voltage for the relays.
MANUAL CHANGES
Release 11/18/14
Release 10/19/2015.This release adds:
•
detail for the LED Module assembly and mounting
•
detail for using ceramic TO220 washers
Summary of Contents for PackerAmp V4
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