JTM-2A Series
QUADRAPHASE MODULATORS
10 to 1000 MHz / Integrated TTL Drivers / Low Conversion Loss / SMA Connectors
PRINCIPAL SPECIFICATIONS
Model
Number
JTM-2A-***B
JTM-2A-***B
Center
Freq, f
o,
MHz
10 to 200
200 to 1000
RF
Input
Bandwidth
10% of f
o
10% of f
o
Amplitude
Balance,
dB, Max.
0.5
1.0
Phase Balance
@:
f
o
Band Limits
±2°
±3°
±4°
±5°
Insertion
Loss,
dB, Max.
6
9
VSWR
Max.
1.5:1
1.5:1
For complete Model Number replace *** with desired Center Frequency, f
o
in MHz.
A Package Outline
GENERAL SPECIFICATIONS
Impedance:
50
Ω
nom.
RF Input Level:
0 dBm nom.
Modulation Sequence
TTL Data Ports 1,2: 0,0 : ref. 0°
1,0 : -- 270°
1,1 : -- 180°
0,1 : -- 90°
Carrier Suppression: 30 dB nom.
Data Bandwidth:
DC to 50 MHz nom.
DC Power:
+5V @ 25 mA nom.
Weight, nominal:
2.2 oz (65 g)
Operating Temp:
-- 55° to + 85°C
NOTES:
1. Tolerance on 3 place decimals
±
.020(.51)
except as noted.
2. Dimensions in inches over millimeters.
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
F rf t e if r to c n a t
M ERRI AC /41 Faifel Pl,W estCal
o ur h r n o ma in o t c
M
ri d .
dwel,NJ,07006 / 201- 1300 /FAX 201- 0531
l
575-
575-
MERRIMAC [ MERRIMAC INDUSTRIES, INC. ]
