Table of Contents
Advertisement
TD220MAX_manual_v11.doc
3.2 USB
The radio provides a USB Port conforming to version 1.1 of the USB standard. This port is provided
for features such as logging STFP messages to text files on a memory stick. Consult GE MDS for
information on this feature. The pinout for this connector is given in the table below.
Pin
Signal Name
1
PC_USB_+5V
2
USBD-
3
USBD+
4
GROUND
3.3 Power
The power connector is a screw-secured 2-pin connector.
Pin
Signal Name
1 (L)
PWR
2 (R)
GROUND
The pin orientation as looking into the connector is shown below.
L
R
Consult the following table to determine how much current is required for receiving or transmitting
vs. input voltage and RF power output. Duty cycle is a function of how many time slots of the 8 per
second are used for transmission. The STFP protocol used by the communications manager to send
data into the radio for transmission over the air specifies what time slot to use for each, so if the
communications manager uses all 8 slots, the duty cycle is 100%. If four are used every second, the
duty cycle is 50%. If 7 are used every 3 seconds (24 slots), the duty cycle is 29% (roughly 30%).
Many other duty cycles are possible depending on the epoch size and number of transmissions
within each epoch. If the duty cycle exceeds 29%, the RF output power is limited to 2 Watts. All MPE
RF safety calculations are based on the highest ERP levels.
Voltage (V)
RF Power Out
(W)
12
0 (RX)
12
2
12
10
12
25
13.8
0 (RX)
13.8
2
13.8
10
13.8
25
3.4 Antenna Connector
The Antenna Connector is a type N female connector with 50-Ohm characteristic impedance.
05-6906A01
Description
+5 VDC
USB Data Minus
USB Data Plus
Ground
Direction with respect to MDS Equipment
Input
Input
Duty Cycle (%)
0
100
30
30
0
100
30
30
Page 7 of 49
Description
13.8 VDC input, 7
Amps maximum.
Power return.
Current Required
Thermal
(A)
Dissipation (W)
0.3
TBSL
TBSL
TBSL
TBSL
TBSL
TBSL
TBSL
0.3
TBSL
1.2
14
3.2
14
5.5
15
7/31/2014
Advertisement
Table of Contents
