15.2. Interface cable for SDM600 series:
(Adds X10DR to the SDM600 mobile radio)
Figure 3: X10DR- SDM600 Interface cable.
1. Switched B+: Used to automatically turn on/off Mobile wireless rem. spk. mic. if
connected to host radio switched B+ output, if not, the user should supply
manual on/off switch.
Note: internal speaker microphone battery will still charge when the unit is turned
off.
2. External Mic Audio: Audio from the Wireless Microphone that is to be
transmitted over the host mobile radios transmitter. Adjust VR1 so MWRSM
audio matches the level from mobile mic.
3. Radio Mic Lo: This is microphone audio ground.
4. Receive Audio: Receive audio from the host mobile radio that you wish to be
sent to the Wireless Microphone. Ideally, it should be sourced pre volume
control but can be post, as long as the host mobile radio’s speaker audio has
first been sent for a comfortable listening level in the vehicle.
5. Power: connected via a 1 amp in-line fuse preferably direct to a vehicle’s 12V
battery but can be any voltage from about 6-16VDC. Current consumption is
typically 60mA/Max current 420mA@6V. (12V = <200mA)
6. Ext PTT: Switched ground output designed to cause the host mobile radio to
transmit.
7. Emergency: Output intended to connect to the host mobile radio’s emergency
input. It is normally provides an active switched ground but can be configured
to be active open circuit. The time held low (or high) is the exact time that the
user presses the Emergency button. This output could be used for other
functions such as to trigger the panic function of a car alarm system, providing
it is correctly “buffered”.
Doc Number:
TNM-U-E-0180 ISSUE 1.1
Page
32
