User Manual

17
PROGRAMMING
Introduction
DTC has built in a lot of flexibility in the programming options you have on the
VMS series transmitters. You can choose to use some, all or none of this
flexibility.
When you order a VMS transmitter, DTC will factory program your frequencies at
no additional charge to you. You may want to place a sticker over the rotary
switch on the chassis, so users in the field don’t attempt to change frequencies.
This is often the best path for state and local agencies with limited frequencies
available to them.
DTC will also provide you with free software and a free programming cable,
enabling you to change your video frequencies and their associated audio sub-
carriers. This is ideal if you often work with other agencies, or anticipate the
equipment being used by a multi-jurisdictional task force. You can program up to
ten channel settings per unit. In general, this allows you to program most varia-
tions you might encounter in the field at the depot level.
As a practical matter, your VMS transmitter’s video frequencies and audio sub-
carriers will be dictated by the frequency and sub-carriers(s) of your receiver and/
or repeater. In many cases, these devices are crystal controlled or have few
channel options.
TIP: Make sure that you program your transmitter to match the frequencies
and audio sub-carriers on your receiver, and test the components as a
system prior to going into the field!