Mike Blenderman, K7IC passed in 2022. This December 2021 mirror of his onfreq.com site was extracted from the Wayback Machine.

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P103 connector pin out (above), viewed from the back of the control head.

Spectra P103
HLN6020 and HLN6078
Very Early Version Control Head Connectors
Control Head
P103 Pin #		  Control Head Pin Description
1  N.C.
2  N.C.
3  Mic Lo
4  Switched B+
5  A+
6  Ground
7  N.C.
8  N.C.
9  N.C.
10  Bus - (RS-422 Input/Output)
11  Ignition
12  Switched B+
13  Ground
14  VIP Out 3
15  VIP In 3
16  VIP In 2
17  VIP In 1
18  VIP Out 1
19  VIP Out 2
20  N.C.
21  N.C.
22  Bus + (RS-422 Input/Output)
23  Reset (Input/Output)
24  N.C.
25  Busy (Input/Output)
26  Keyed Slot (the connector pin is missing)
27  Mic Hi
28  N.C.

 

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27 28

P103 connector pin out (above), viewed from the back of the control head.

Spectra P103
HLN6075
Early Version Control Head Connectors
Control Head
P103 Pin #		  Control Head Pin Description
1  N.C.
2  N.C.
3  Mic Lo
4  Switched B+
5  A+
6  Ground
7  VF Sense 2
8  VF Sense 1
9  Securenet Key
10  Bus - (RS-422 Input/Output)
11  Ignition
12  Switched B+
13  Ground
14  VIP Out 3
15  VIP In 3
16  VIP In 2
17  VIP In 1
18  VIP Out 1
19  VIP Out 2
20  Securenet KID
21  Securenet Write Enable
22  Bus + (RS-422 Input/Output)
23  Reset (Input/Output)
24  N.C.
25  Busy (Input/Output)
26  Keyed Slot (the connector pin is missing)
27  Mic Hi
28  N.C.

 

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27 28

P103 connector pin out (above), viewed from the back of the control head.

Spectra P103
HLN6263, HLN6283, HLN6337, HLN6338, AALN4009 and AALN4015
Later Version Control Head Connectors
Control Head
P103 Pin #		  Control Head Pin Description
1  VF Sense 1
2  VF Sense 2
3  Mic Lo
4  Switched B+
5  A+
6  Ground
7  Spare 2
8  Spare 1
9  Securenet Key
10  Bus - (RS-422 Input/Output)
11  Ignition
12  Switched B+
13  Ground
14  VIP Out 3
15  VIP In 3
16  VIP In 2
17  VIP In 1
18  VIP Out 1
19  VIP Out 2
20  Securenet KID
21  Securenet Write Enable
22  Bus + (RS-422 Input/Output)
23  Reset (Input/Output)
24  PTT
25  Busy (Input/Output)
26  Keyed Slot (the connector pin is missing)
27  Mic Hi
28  Hang Up Box (HUB)

 

 

P104 connector pin out (above), viewed from the front of the control head (pins 1, 2, 9 and 10 are different in the very early version control head circuit boards).

Spectra P104 Control Head Connectors
Front
Mic.
P104
Pin #		  Very Early P104 Pin Description  Early and Later P104 Pin Description
1  N.C.  Ground
2  Bus - (RS-422 Input/Output)  Securenet Write Enable
3  Hang Up Box (HUB)  Hang Up Box (HUB)
4  Switched B+  Switched B+
5  Ground  Ground
6  PTT  PTT
7  Mic Lo  Mic Lo
8  Mic Hi  Mic Hi
9  Bus + (RS-422 Input/Output)  Securenet KID
10  Busy (Input/Output)  Securenet Key

 

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