Compact RDMS
TM
Telemetry Receiver
1
Quasonix, Inc.
3.2 Thermal
It is important that the RDMS
™
be kept within its specified operating range of -40°C to +70°C. At maximum bit
rates, the unit dissipates approximately 20 watts. At normal ambient room temperatures, a small fan blowing across
the top cover is adequate. Higher ambient temperatures will require more airflow and/or a finned heat sink on the
cover.
3.3 Electrical
The RDMS
™
has three external connectors, an MDM-15 male for all baseband interfaces, a female SMA connector
for the RF input, and a second female SMA connector for an IF output. Note that first generation hardware did not
include the IF output. The pin numbering and wiring for the MDM-15 male connector is shown in Figure 3. Refer to
Appendix B for optional 37 pin information.
Figure 3: MDM-15 Pin Numbers
Table 3: MDM-15 Pin Assignments
Position Signal
Description
1
+28 VDC
Primary 28 VDC power to module
2 Ground
Primary power return, 2 amps maximum;
Internally tied to pins 3, 6, and 10
3 Ground
Primary power return, 2 amps maximum;
Internally tied to pins 2, 6, and 10
4 Clock
Out
Primary LVTTL clock output, Clock+ for RS 422
output
5 Data
Out
Primary LVTTL data output, Data+ for RS 422
output
6 232
Ground
Ground return for RS-232 control lines; Internally
tied to pins 2, 3, and 10
7
Demod Lock Out
3.3 volt TTL lock detector output for all modes