
A Package Outline
JTM-2A Series
10 to 1000 MHz / Integrated TTL Drivers / Low Conversion Loss / SMA Connectors
QUADRAPHASE MODULATORS
For further iformatin contact
MERRIMAC / 41 Fairfield Pl., West Caldwell, NJ, 07006 / 201-575-1300 / FAX 201-575-0531
PRINCIPAL SPECIFICATIONS
Center
Freq, f
o,
MHz
10 to 200
200 to 1000
RF
Input
Amplitude
Balance,
dB, Max.
0.5
1.0
Phase Balance
@:
f
o
Band Limits
±
2°
±
3°
Insertion
Loss,
dB, Max.
6
9
Model
Number
JTM-2A-***B
JTM-2A-***B
VSWR
Max.
1.5:1
1.5:1
Bandwidth
10% of f
o
10% of f
o
±
4°
±
5°
For complete Model Number replace *** with desired Center Frequency, f
o
in MHz.
GENERAL SPECIFICATIONS
Impedance:
RF Input Level:
Modulation Sequence
TTL Data Ports 1,2: 0,0 : ref. 0°
50
nom.
0 dBm nom.
1,0 : -- 270°
1,1 : -- 180°
0,1 : -- 90°
30 dB nom.
DC to 50 MHz nom.
+5V @ 25 mA nom.
2.2 oz (65 g)
-- 55° to + 85°C
Carrier Suppression:
Data Bandwidth:
DC Power:
Weight, nominal:
Operating Temp:
NOTES:
1. Tolerance on 3 place decimals
±
.020(.51)
except as noted.
General Notes:
1. Units in the JTM-2A series of Quadraphase Modulators are composed of two biphase modulators with TTL drivers,
a 90° quadrature hybrid and an inphase power combiner.
2. These devices are generally used in systems to generate QPSK coded signals. The units accept two differential data
inputs each of which independently biphase modulates an RF carrier. These are then combined to produce a
quadraphase output of 0, 90, 180 and 270 degrees.
3. Units in the JTM-2A series are available with center frequencies from 10 to 1000 MHz and having a minimum bandwidth
equal to 10% of the center frequency.
4. Merrimac Quadraphase Modulators comply with the relevant sections of MIL-M-28837 and may be supplied screened
for compliance with additional specifications for military and space applications requiring the highest reliability.
29Apr96