Batboard

Where do the wiring harness plugs go on the system 90 heads? There are 2 purple, 2 grey or white, 1 green, 1 red, and 1 black. There is 7 plugs and only space for 5. This is a syntor x uhf 100 watt. Thanks Gary

Sounds like you have a cable wired for heads you don't have. I'm no authority, just taking a guess, but I'd say you have connectors for a scan, siren, or user select PL head.

Mike B will hopefully see your post soon and have answers for you, or you can check his Syntor webpage at

http://www.open.org/~blenderm/syntorx

This is probably the most comprehensive Syntor info page on the net.

Good luck, that X is a great radio. I have a hi band and wish I had a UHF, and could afford a low band.

Typically, red and light green 22 pin connectors are for a Securenet (i.e. DVP) control head. This is a separate control head board that installs inside a HHN4011A Systems 90*s housing. If you can find one, you can use a HLN5244A DVP bypass board in place of the Securenet board. This will allow you to use the existing DVP cable without having Securenet.

You can also use a 66-84690C02 Contact Pin Removal Tool or homemade equivalent to remove the cable wires from the red and light green connector bodies, then rewire them to the appropriate connectors:
http://www.open.org/~blenderm/syntorx/c ... #xexamples

The control head will be reconfigured (if it is the original head that goes with your Securenet cable) to get its audio from the Securenet control head board instead of the radio's detected audio line. So you will need to restore the 3.3k resistor if you do not use the Securenet control head or bypass board:
http://www.open.org/~blenderm/syntorx/c ... tml#sys90s
(see the notes below the part number list)

The extra pair of purple and gray connectors are either for a System 90*s operator select non-priority scan control head:
http://www.open.org/~blenderm/syntorx/c ... tml#opscan
or for a System 90*s operator select multiple PL/DPL control head:
http://www.open.org/~blenderm/syntorx/c ... html#opmpl

You can get one of the above Scan or PL/DPL control heads, or use the contact removal tool to remove one purple and gray 22 pin connector and rewire the cable.

When you plug the cable into the control head stack, every connector must be plugged into its correct spot. The power from the control head green wire to the radio is daisy chained from the black to the gray connectors. If a black or gray connector is not plugged in the daisy chain connecton will be broken and the radio will never get any power from the on/off switch. Many other signal wires are also daisy chained on other connectors. The Securenet board also has its own daisy chained signals.

In short, you can use it as a Securenet radio (with the correct control head added), or substitute the DVP bypass board, or modify the cable into a non-Securenet configuration. You will still have to replace the missing Scan or PL/DPL control head, or modify the cable remove its purple and gray connectors.