Collcomm NCS-C412 User manual

collcomm inc NCS-C412 Dual Trunking Delay Module
Instruction Sheet
2310 Pendley Rd, Cumming, GA 30041 –Tel/Fax: [phone]
www.collcomminc.com
Introduction
The NCS-C412 Dual Trunking Delay Module installs between any 2 RAD ports of the
NCS-C250/C251 & the NCS-C150 and a Trunking Radio. The module is comprised of 2
independent delay circuits to support 2 Trunking radios. The purpose of the module is to
delay the transmitted audio and PTT release while the Trunking Radio acquires a channel
from the Trunking Radio System controller. This prevents voice transmissions from
being lost or “chopped” during the channel assignment (trunking handshake).
Items Supplied
Items supplied with the NCS-C412 are:
1. NCS-410-TRM-01.5 (NCS-C412 to NCS-C250/C251/C150 Interface Cable) [Qty 2]
2. NCS-C412 Power Pigtail [Qty 1]
3. Mounting Bracket Kit (Brackets (x2) & Screws (x8)) [Qty 1]
4. Rubber Mounting Feet [Qty 4]
5. This Instruction Sheet
Note that the Radio Interface Cable is supplied separately.
NCS-C412 Installation
The Trunking Delay Module is installed between any RAD port on the NCS-C250/C251
& the NCS-C150 and a Trunking Radio as shown in the diagram on the following page.
The Power Pigtail should be connected to a regulated 12-16VDC power source capable
of at least 500mA. When power is applied correctly, both Green Power LEDs (one for
each circuit) will be illuminated.

NCS-C412 Setup and Operation
The NCS-C412 has an adjustment on the front for setting the total Trunking Channel
Acquisition delay for each independent Delay circuit. Turn this control using a small
screwdriver to equal or exceed the maximum delay expected from the trunking system.
Available values (also shown on the unit’s front panel) are: 0ms, 50ms, 100ms, 200ms,
400ms, 800ms, 1600ms and 3200ms.
During operation, when the trunking radio is selected and keyed from the C250/C251 or
C150, the radio will key for at least the set delay period and transmitted audio will be
transmitted complete during this time. When PTT is released from the C250 or C150, the
PTT to the radio and transmitted audio will cease after the set delay.
Rear of C412
Side of C412
Connect cable supplied with C412
to RAD port on C250/C251 or
C150 here. (2 plcs)
Connect radio
interface cable
here. (2 plcs)
Connect DC power
cable supplied with
C412 here.
Mounting Bracket Holes (x4 each side).
Bracket can be positioned to secure C412
for top or bottom attachment.
CAUTION: Only use supplied screws
(#6 x ¼ sheet metal screws).