LPT not supported in Win7, Win8

LPT1 band encoder - BCD truth table

Band (MHz)
A
B
C
D
position
50
0
0
0
0
0
144
1
0
0
0
1
222
0
1
0
0
2
432
1
1
0
0
3
903
0
0
1
0
4
1296
1
0
1
0
5
2304
0
1
1
0
6
3456
1
1
1
0
7
5760
0
0
0
1
8
10GHz
1
0
0
1
9
24GHz
0
1
0
1
10
47GHz
1
1
0
1
11
76GHz
0
0
1
1
12
BCD bits go high for the band activated.
Data bit A is the `Least Significant Bit` (LSB) and data bit D is the `Most Significant Bit` (MSB).
N3FTI`s decoder uses bit D for a second function - `Microwave setup` for example.
The logger`s band encoder can be set so 50MHz starts at position 1, non-logical 0.

Decoder inputs are connected to LPT1 as follows:
A
LPT Pin 2
B
LPT Pin 7
C
LPT Pin 8
D
LPT Pin 9
Ground
LPT Pin 18

When CW is selected on LPT, connections are as follows:
Emitter Q1
LPT Pin 1
Base Q1, with 3K-ohm series resistor
LPT Pin 17
Collector Q1
Rig key jack
Rig CW ground
LPT Pin 18
Q1
2N4401
If a TopTen decoder is used, this setup supports CW to the rear panel RCA jack.

PTT works on some of my loggers on LPT.
Emitter Q1
Rig Ground
Base Q1, with 3K-ohm series resistor
LPT Pin 16
Collector Q1
Rig PTT jack
Q1
2N4401


Important: Read this about hot-switching #4.

USB to LPT converters do not work for LPT multi-outputs like BCD. Use a PCI slot LPT board, or external LPT board - supported by the loggers.