TO-220 THERMASIL III with adhesive back ...................... 30
IRF510 MOSFET Lead Bend ............................................. 30
MOSFET Attachment to the Circuit Board ......................... 31
Circuit Board and Case Assembly Procedure .................... 31
MOSFET Alignment over Heat Sink Holes ........................ 31
LT1270A, U4 Attachment to the heat sink ......................... 32
PINET 100-PI Option Module ................................................ 33
100-PI Assembly ............................................................... 33
100-PI Cable Fabrication ................................................... 33
Attach the Model PI-100 Module........................................ 35
Cable Connections on the Model PI-100 Module ............... 35
100-PI Theory of Operation ............................................... 36
Section Five – Adjustment and Testing ................................. 37
Ohmmeter Test ................................................................. 37
Basic Current Test ............................................................. 37
RF Signal Testing .............................................................. 38
DC Current Test and Bias Adjustment ............................... 38
Voltage Test ...................................................................... 38
LPF RF Testing ................................................................. 39
LT1270ACT Alert Notice .................................................... 39
RF Power Testing .............................................................. 40
PTT Connections FLEX 1500 and FT817 .......................... 41
Section SIX – Specifications and Operation ......................... 42
Specifications.................................................................... 42
Operation .......................................................................... 42
Do’s and Don’ts for Successful Operation ......................... 43
Maintenance Issues .......................................................... 43
CW/SSB Auto Selection .................................................... 43
Section 7 Theory of Operation and Troubleshooting ............. 44
Power Supply Unit ............................................................ 44
Power Input ................................................................... 44
Reverse Voltage Protection ........................................... 44
DC-DC Converter, U4.................................................... 45
Timing Sequence of Control Signals .............................. 45
U4 Control ..................................................................... 46
Fully Protected High Side Power MOSFET Switch, U5 .. 46
CONTROL HFPA 10 ..................................................... 46
Big Picture ..................................................................... 46
U6 ................................................................................. 46
K2, K3 and J4 ................................................................ 46
TX Signal Generation .................................................... 47
PTT Control ................................................................... 47
CW or SSB option ......................................................... 47
TEST Jumper, H3 .......................................................... 47
FAN Option J6 ............................................................... 48
5V Regulator ................................................................. 48
Summary of Contents for PackerAmp V4
Page 65: ...APPENDIX A www hfprojects com vstamps comcast net 281 467 9424 ...
Page 76: ......