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70/140 mhz if interface, L-band rf interface – Comtech EF Data MIDAS 4 System and Design User Manual

Page 121

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System and Design Manual, Revision 2

Traffic

Node

6–23

7

7

0

0

/

/

1

1

4

4

0

0

M

M

H

H

z

z

I

I

F

F

I

I

n

n

t

t

e

e

r

r

f

f

a

a

c

c

e

e

The traffic node connects to the RF equipment via the IF interface, whose
characteristics are as follows:

Operating IF Range 50 to 180 MHz

Characteristic Impedance 75

Transmit Level:

SNM-1000, SNM-1010

SDM-100,

SDM-300/300A

CDM-550, CDM-600, CiM-550

-30 to -5 dBm

-30 to -5 dBm

-20 to 0 dBm

Receive Level (at Modem):

SNM-1000, SNM-1010

SDM-100,

SDM-300/300A

CDM-550, CDM-600, CiM-550

-55 to -30 dBm

-55 to -30 dBm

-60 to –30 dBm

L

L

-

-

B

B

a

a

n

n

d

d

R

R

F

F

I

I

n

n

t

t

e

e

r

r

f

f

a

a

c

c

e

e

Operating RF Range

Transmit Level:

SNM-1010L

Receive Level (at Modem):

SNM-1010L

950 to 1750 MHz

-40 to 0 dBm

-135 dBm + 10log(symbol rate)
to –85 dBm +10log (symbol rate)