HF PackerAmp V4, Construction Manual

Page: 17 / 76

Section 3 - Low Pass Filter Module Assembly
This is the 10‐Band Filter Module HFPA‐FILTER‐12

Size: 3.8 x 2.4 inch; Bands: 160‐10M Power Rating: 50W; Control:
Front panel switch

Design: Four‐Layer Ground Plane with greater than ‐40dB
rejection in the stop band;

Relay Front End controlled by front panel switch, LED display.
Organize for Assembly
 Place on the table in front of you all the capacitors ranging
from smallest value to largest value from left to right.
 Organize the cores and relays into like groups.
 Two Blue Cores – T68-1
 Two Larger Red Cores – T50-2

Two Smaller Red Cores – T44-2
 Seven Yellow Small Cores – T37-6
 Wind the cores referring to the core winding table
"REALLY CHECK THE POLARITY OF THE DIODES FOR THE RELAYS
ON THE LPF BOARD"
Install Relays and Diodes
Install the six diodes on the circuit board observing that the
stripe on the diode matches the board silkscreen for the part.
Be careful that your tools do not damage the circuit board. The
diodes require that the leads are bent very close to the body of
the diode. Before installing, scrape the leads near the body to
remove any oxidation on the leads. Install

Install six relays. Solder one pin, reheat and align flat. Install

Capacitor Assembly

Install the capacitors in the sequence given and soldering
when called for. The part may be oversized for the insertion
holes. Form the leads for a best fit. Double check your work.
C1 1500, C2 2700, C3 1500 Install

C4 1000, C5 1800, C6 1000 Install

C7 39, C8 110, C9 390, C10, 680, C11 330 Install

C12 27, C13 150, C14 100, C15 100, C16 220, C17 220, C18
47 Install

C19 12, C20 39, C21 150, C22 220, C23 100 Install

C24 12, C25 39, C26 82, C27 150, C28 68 Install
