M&S Systems dmcRAC — Antenna Upgrade Kit Installation Instructions

Installation instructions for the M&S Systems dmcRAC Antenna Upgrade Kit, used with the dmc1 master intercom for retrofit applications requiring an AM/FM antenna connection.

What It Does

The dmcRAC is only required when using a dmc1 master for a retrofit application. It is not required on the dmc3-4 retrofit master (which uses the existing antenna).

Tools Required

• #1 Phillips screwdriver

Installing the dmcRAC

1. Remove two screws from the dmc1 master on either side of the antenna connections (this vacant screw hole will be used for the standoff and a supplied screw).
2. Insert the supplied screw into the top of the dmcRAC.
3. Slide the standoff onto the screw. Note the "Header Plug" location.
4. Find the radio Header Socket. With radio power off, align the standoff and screw with the screw hole left vacant in step 1. Carefully align all pins of the Header Plug with the Header Socket, then push the dmcRAC into the radio PC board.
5. Tighten the new screw. After the antenna board is in position, use the enclosed screws, spacer, and washer to connect the board — position the lock washer on the spacer and insert between the antenna board and the open screw hole on the dmc1 (lock washer must be between the board and the spacer). Use the enclosed screw to fasten the spacer in place. Repeat on both sides of the dmcRAC board.
6. Repower the radio by re-connecting the positive +VDC +PWR wire to terminal TB1. Wait 2 minutes for all devices to fully power before proceeding.

Note: Two jumper pins on the board are reserved for future use.

Connecting the Antenna

Separate the intercom cables from the antenna leads if grouped together — the intercom cables can shield the antenna leads, resulting in poor radio reception. Keep antenna leads away from metal ductwork and aluminum-backed insulation, which can also shield the antenna leads. The number and style of antenna leads will vary based on the intercom system being replaced.

Attaching a NuTone 300 Ohm Twin Lead Antenna to the dmc3-4

1. If the antenna has a plug on the end, cut the plug off.
2. Strip the 2 wire ends.
3. Connect the wire ends to terminal S1 and S2 on the antenna board.
4. Connect a bare jumper wire (22 gauge speaker wire works well) between the S3 and S4 terminals.

Attaching a Separate AM/FM Antenna System (300 Ohm FM Twin Lead + Orange AM Antenna Wire)

1. Connect the FM twin leads to terminal S1 and S2 on the board.
2. Connect the AM antenna (orange wire) to terminal S4.
3. Terminal S3 is not used in this configuration.

Connecting a Single Orange Wire Antenna System

1. Connect the orange wire to either S1 or S2. Do not connect the wire to both S1 and S2 — doing so will short out the FM antenna signal.
2. Connect a bare jumper wire (22 gauge speaker wire works well) between the S3 and S4 terminals.

Warranty

M&S Systems warrants its products to be free of defects for 2 years from the date of purchase/installation (or date of closing on a new residence in which the product was originally installed). The warranty extends to the original user and each subsequent owner during the warranty term. Before returning any product, obtain a Return Authorization Number (RAN) from the M&S Systems service department — products returned without a RAN will be refused.

This warranty does not cover damage from improper installation, acts of God, criminal acts, code violations, or use of non-M&S wire/cable (excluding CAT5 and RG-6) or wall housings.

Contact: M&S Systems, toll-free service (800) 421-1587 | www.mssystems.com