User's Manual

Page 8 RF
Technology T350/T500
2.5 JP7: Audio Response 4 CHANNEL AND TONE FREQUENCY PROGRAMMING
2.5 JP7: Audio Response
Condition Position
750 uSec. pre-emphasis 1-2 *
Flat response 2-3
2.6 JP8: Sub-audible Tone Source
Condition Position
Internal CTCSS 1-2, 4-5 *
External input 2-3, 5-6
2.7 JP9/10/11: dc Loop Configuration
These settings are only relevant when the PTT signal is to be used across the same wires
as the audio. Refer to setting of JP3. They control the levels and connection into the
audio balanced line circuitry.
Condition JP9 JP10 JP11
Current Loop Input ON OFF OFF *
12Vdc Loop source OFF ON ON
3 Transmitter I/O Connections
3.1 25 Pin Connector
The D-shell 25 pin connector is the main interface to the transmitter. The pin
connections are described in table 3.
4 Channel and Tone Frequency Programming
Channel and tone frequency programming is most easily accomplished with RF
Technology TecHelp software or the Service Monitor 2000 software. This software can
be run on an IBM compatible PC and provides a number of additional useful facilities.
DOS and 32-bit versions are available.
TecHelp allows setting of the adaptive noise squelch threshold, provides a simple means
of calibrating the forward and reverse power detectors, setting the power alarm preset
levels, and enabling transmitter hang time and timeout time limits. TecHelp can be
supplied by your dealer, distributor or by contacting RF Technology directly.