Atec 50S1G4A User Manual
Model 50S1G4A,
M1 through M4
50 Watts CW
0.8–4.2GHz
The Model 50S1G4A 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 50S1G4A, when used with a sweep generator, will provide a minimum of 50 watts of RF power. Included
is a front panel gain control which permits the operator to conveniently set the desired output level. The
50S1G4A 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 over-temperature or power supply fault has occurred. The unit can be returned
to operate when the condition has been cleared. The 50S1G4A 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 50S1G4A 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.
120
50S1G4A TYPICAL PERFORMANCE
70
100
80
60
40
OUTPUT POWER (Watts)
20
0
0 1 2 3 4 5
3RD ORDER INTERCEPT POINT
LINEAR @ 3dB COMPRESSION
LINEAR @ 1dB COMPRESSION
FREQUENCY (GHz)
60
50
40
30
20
3RD ORDER INTERCEPT POINT (dBm)
10
060408
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RATED POWER OUTPUT................................................50 watts minimum
INPUT FOR RATED OUTPUT ..........................................1.0 milliwatt maximum
POWER OUTPUT @ 3dB COMPRESSSION
Nominal ................................................................70 watts
Minimum ...............................................................50 watts
POWER OUTPUT @ 1dB COMPRESSION
Nominal ................................................................60 watts
Minimum ...............................................................40 watts
FLATNESS .....................................................................±1.5 dB typical
±2.0 dB maximum
FREQUENCY RESPONSE ...............................................0.8–4.2 GHz instantaneously
GAIN (at maximum setting) ...........................................47 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
MISMATCH TOLERANCE*..............................................100% of rated power without foldback. Will operate without damage or
MODULATION CAPABILITY ...........................................Will faithfully reproduce AM, FM, or pulse Modulation appearing on
THIRD ORDER INTERCEPT .............................................See chart. The third order intercept points for this chart have been
HARMONIC DISTORTION .............................................Minus 20 dbc max at 50 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
600 watts maximum
CONNECTORS
RF..........................................................................Type N female
REMOTE INTERFACES
IEEE-488............................................................24 pin
RS-232 ..............................................................9 pin Subminiature D
SAFETY INTERLOCK ......................................................15 pin Subminiature D
COOLING....................................................................Forced air (self contained fans)
MODEL RF INPUT RF OUTPUT WEIGHT SIZE (W x H x D)
50S1G4A Type N female, front panel Type N female, front panel 45 kg (100 lbs) 50.3 x 24.9 x 54.6 cm
50S1G4AM1 Type N female, rear panel Type N female, rear panel 45 kg (100 lbs) 50.3 x 24.9 x 54.6 cm
50S1G4AM2 Same as 50S1G4A with enclosure removed for rack mounting 32 kg (71 lbs) 48.3 x 22.2 x 54.6 cm
50S1G4AM3 Same as 50S1G4AM1 with enclosure removed for rack mounting 32 kg (71 lbs) 48.3 x 22.2 x 54.6 cm
50S1G4AM4 Obsolete
SPECIFICATIONS, MODEL 50S1G4A
oscillation with any magnitude and phase of source and load
impedance. *See Application Note #27.
the input signal
determined using two tones spaced 1 MHz apart. This is typical for WCDMA systems. Closer tone spacing such as 60 kHz generally provides
about a 1db to 3db improvement in the IP.
MODEL CONFIGURATIONS
19.8 x 9.8 x 21.5 in
19.8 x 9.8 x 21.5 in
19.0 x 8.75 x 21.5 in
19.0 x 8.75 x 21.5 in
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