Atec AR-25S1G4 User Manual
160 School House Road, Souderton, PA 18964-9990 USA
Phone 215-723-8181•FAX 215-723-5688
REV082202
MODEL 25S1G4
M1, M2, M3, M4
25 WATTS CW
0.8 – 4.2 GHz
The Model 25S1G4 is a solid state, self-contained, air-cooled, broadband amplifier designed for
applications where instantaneous bandwidth, high gain and linearity are required. Housed in a stylish
contemporary cabinet, the unit is designed for benchtop use, but can be removed from the cabinet for
immediate equipment rack mounting.
The 25S1G4, when used with a sweep generator, will provide a minimum of 25 watts of RF power.
Included is a front panel gain control which permits the operator to conveniently set the desired
output level. The 25S1G4 is protected from RF input overdrive by an RF input leveling circuit
which controls the RF input level to the RF amplifier first stage when the RF input level is increased
above 0 dBm. The RF amplifier stages are protected from over-temperature by removing the DC
voltage to them if an over-temperature condition occurs due to cooling blockage or fan failure. There
is a digital display on the front panel to indicate the operate status and fault conditions if an overtemperature or power supply fault has occurred. The unit can be returned to operate when the
condition has been cleared. The 25S1G4 digital panel provides control of all amplifier functions
both locally and remotely via IEEE-488 (GPIB) or RS -232 interfaces.
The low level of spurious signals and linearity of the Model 25S1G4 make it ideal for use as a
driver amplifier in testing wireless and communication components and subsystems. It can be used
as a test instrument covering multiple frequency bands and is suitable for a variety of communication
technologies such as CDMA, W-CDMA, TDMA, GSM etc. It is also suitable for EMC Test
applications where undistorted modulation envelopes are desired.
25S1G4
Typical Performance
60
3RD ORDER INTERCEPT
50
40
30
20
OUTPUT POWER (Watts)
10
0
0 1 2 3 4 5
LINEAR @ 1dB
COMPRESSION
LINEAR @ 3dB
FREQUENCY (GHz)
60
50
40
30
20
10
3RD ORDER INTERCEPT POINT (dBm)
0
SPECIFICATIONS
Model 25S1G4
RATED POWER OUTPUT......... 25 WATTS MINIMUM
INPUT FOR RATED OUTPUT............ 1.0 MILLIWATT
MAXIMUM
POWER OUTPUT @ 3dB COMPRESSSION
Nominal................................................................... 32 watts
Minim um................................................................. 25 watts
POWER OUTPUT @ 1dB COMPRESSION
Nominal................................................................... 27 watts
Minimum................................................................. 20 watts
FLATNESS .................................................... ±1.5 dB typical
..................................................................... ±2.0 dB maximum
FREQUENCY RESPONSE .......................... 0.8 – 4.2 GHz
.......................................................................... instantaneously
GAIN (at maximum setting)..................... 44 dB minimum
GAIN ADJUSTMENT.........................(Continuous Range)
..........................................................................10 dB minimum
................................................................... (4096 steps remote)
INPUT IMPEDANCE ............................................. 50 ohms
..............................................................VSWR 2.0:1 maximum
OUTPUT IMPEDANCE........................ 50 ohms, nominal
MODEL CONFIGURATIONS
MISMATCH TOLERANCE
100% of rated power without foldback. Will
operate without damage or oscillation with any
magnitude an d phase of source and load
impedance. (See Application Note #27)
MODULATION CAPABILITY
Will faithfully reproduce AM, FM, or pulse
Modulation appearing on the input signal
THIRD ORDER INTERCEPT
See chart. The third order intercept points for
this chart have been determined using two
tones spaced 1 MHz apart. This is typical for
W-CDMA systems. Closer tone spacing such as
60 kHz generally provides about a 1db to 3db
improvement in the IP.
HARMONIC DISTORTION..........................Minus 20 dbc
...........................................................................max at 20 watts
SPURIOUS................................................Minus 73 dbc Typ.
PHASE LINEARITY................... ±± 1.0 deg/100 MHz, Typ
PRIMARY POWER ......................(Selected Automatically)
................................................................90-132, 180-264 VAC
...............................................................50/60 Hz, single phase
...................................................................340 watts maximum
CONNECTORS
RF ............................................................ Type N female
REMOTE INTERFACES
IEEE-488..........................................24 pin female
RS-232.................9 pin Subminiature D (female)
SAFETY INTERLOCK ................. 15 pin Subminiature D
COOLING........................ Forced air (self contained fans)
MODEL
NUMBER
25S1G4 Type N female on front panel Type N female on front panel 35.0 kg (77.0 lb)
25S1G4AM1 Type N female on rear panel Type N female on rear panel 35.0 kg (77.0 lb)
25S1G4AM2 Same as 25S1G4A with enclosure removed for rack mounting 25.6 kg (57.0 lb)
25S1G4AM3 Same as 25S1G4AM1 with enclosure removed for rack mounting 25.6 kg (57.0 lb)
Type N female on front panel 4 SMA females on rear panel 25S1G4AM4
Single RF input, Four independent RF outputs with Rated Power
RF INPUT RF OUTPUT WEIGHT SIZE (W x H x D)
35.0 kg (77.0 lb)
out of 6 watts each.
50.3 x 20.3 x 54.6 cm
19.8 x 8.0 x 21.5 in
50.3 x 20.3 x 54.6 cm
19.8 x 8.0 x 21.5 in
48.3 x 17.8 x 54.6 cm
19.0 x 7.0 x 21.5 in
48.3 x 17.8 x 54.6 cm
19.0 x 7.0 x 21.5 in
50.3 x 20.3 x 54.6 cm
19.8 x 8.0 x 21.5 in
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