Model 300T2G8,
M1 through M19
300 Watts CW
2.5GHz–7.5GHz
The Model 300T2G8 is a self contained, forced air-cooled, broadband traveling wave tube (TWT) microwave
amplifier designed for applications where instantaneous bandwidth and high gain are required. A reliable TWT
provides a conservative 300 watts minimum at the amplifier output connector. Stated power specifications are
at the fundamental frequency.
The amplifier's front panel digital display shows forward and reflected output plus extensive system status
information accessed through a series of menus via soft keys. Status indicators include power on, warm-up,
standby, operate, faults, excess reflected power warning and remote. Standard features include a built-in IEEE488 (GPIB) interface, 0 dBm input, VSWR protection, gain control, external video pulsing, RF output sample
port, auto sleep, plus monitoring of TWT helix current, cathode voltage, collector voltage, heater current,
heater voltage, baseplate temperature and cabinet temperature.
Modular design of the power supply and RF components allow for easy access and repair. Use of a switching
mode power supply results in significant weight reduction. The external video pulsing feature reduces prime
power use for pulse applications.
Housed in a stylish contemporary cabinet this unit is designed for benchtop use but can be removed from the
cabinet for rack mounting. The Model 300T2G8 provides readily available RF power for a variety of
applications in Test and Measurement, (including EMC RF susceptibility testing), Industrial and University
Research and Development, and Service applications.
See Model Configuration for package alternatives and special features.
300T2G8 TYPICAL POWER OUTPUT
500
CW
400
300
WATTS
LINEAR @ 1dB COMPRESSION
200
100
2 3 4 5 6 7 8
FREQUENCY (GHz)
ar worldwide • rf/microwave instrumentation 060206
160 School House Road Souderton, PA 18964-9990 • 215-723-8181 • www.ar-worldwide.com Page 1 of 3
POWER (fundamental), CW, @ OUTPUT CONNECTOR
Nominal ................................................................350 watts
Minimum ...............................................................300 watts
Linear @ 1 dB Compression ...................................75 watts minimum
FLATNESS.....................................................................±12 dB maximum, equalized for ±5 dB maximum at rated power
FREQUENCY RESPONSE ...............................................2.5-7.5 GHz instantaneously
INPUT FOR RATED OUTPUT ..........................................1.0 milliwatt maximum
GAIN (at maximum setting) ...........................................55 dB minimum
GAIN ADJUSTMENT (continuous range).........................35 dB minimum
INPUT IMPEDANCE.......................................................50 ohms, VSWR 2.0:1 maximum
OUTPUT IMPEDANCE ...................................................50 ohms, VSWR 2.5:1 typical
MISMATCH TOLERANCE...............................................Output power foldback protection at reflected power exceeding 60 watts. Will
MODULATION CAPABILITY...........................................Will faithfully reproduce AM, FM, or pulse modulation appearing on the input
VIDEO PULSE CAPABILITY
Pulse Width............................................................0.05 microseconds min
Pulse Rate (PRF)......................................................100 kHz max
RF Rise and Fall......................................................30 ns max (10 % to 90%)
Delay.....................................................................300 ns max from pulse input to RF 90%
Pulse Width Distortion.............................................± 30 ns (50% points of output pulse width compared to 50% point of input pulse
NOISE POWER DENSITY
(pulse on) ..............................................................Minus 85 dBm/Hz (maximum); Minus 90 dBm/Hz (typical)
(pulse off) ..............................................................Minus 140 dBm/Hz (typical)
HARMONIC DISTORTION.............................................Minus 3.0 dBc maximum, Minus 4.5 dBc typical
PRIMARY POWER ..........................................................190-260 VAC
50/60 Hz single phase
3.0 KVA maximum
CONNECTORS
RF input .................................................................Type N female on rear panel
RF output ...............................................................Type N female on rear panel
RF output sample port ............................................Type N female on rear panel
GPIB...................................................................... IEEE 488 (f) on rear panel
Interlock ................................................................DB-15 (f) on rear panel
Video.....................................................................BNC-female on rear panel
COOLING....................................................................Forced air (self contained fans), air entry and exit in rear.
SPECIFICATIONS, MODEL 300T2G8
operate without damage or oscillation with any magnitude and phase of source
and load impedance. May oscillate with unshielded open due to coupling to
input. Should not be tested with connector off.
signal. AM peak envelope power limited to specified power.
width)
Page 2 of 3
Model Configurations - Model 300T2G8
E Must select one enclosure type from the following [E1 or
E2 or E2S]:
E1 removable outer enclosure, size 19.8 x 11.7 x 27 in.,
50.3 x 29.7 x 68.6 cm; add 14 kg (30 lbs) to weight of
E2.
E2 without outer enclosure, size 19 x 10.5 x 27 in, 48.3 x
26.7 x 68.6 cm; weight 41 kg (90 lbs).
E2S enclosure removed for rack mounting; slides and handles
installed, size same as E2; add 2 kg (5 lbs) to weight of
E2.
S May select a special feature (extra cost) from the following
[(S1R and/or S3P) or (S1R and/or S2K) or (S4P and E2)]:
S1R Reflected power port, type N female connector on rear
panel. Forward and reflected sample port calibration
data supplied on disk in Excel format at 51 points, evenly
spaced over specified frequency response.
Model Number Features Model Number Features
E S E S
300T2G8 E1 - 300T2G8M10 E1 S2K
300T2G8M1 E2 - 300T2G8M11 E2 S2K
300T2G8M2 E2S - 300T2G8M12 E2S S2K
300T2G8M3 E1 S1R & S3P 300T2G8M13 E1 S3P
300T2G8M4 E2 S1R & S3P 300T2G8M14 E2 S3P
300T2G8M5 E2S S1R & S3P 300T2G8M15 E2S S3P
300T2G8M6 E1 S1R 300T2G8M16 E1 S1R & S2K
300T2G8M7 E2 S1R 300T2G8M17 E2 S1R & S2K
300T2G8M8 E2S S1R 300T2G8M18 E2S S1R & S2K
300T2G8M9 E2 S4P 300T2G8M19 E1 SP4
S2K – TF TYPE FILTER SPECIFICATIONS
Reject
Band
(GHz)
5.0-8.4
Rejection
(dB min)
25
Microwave
Filter Model
TF Type
filter 1
filter 2
For Use with
AR TWTA
Model
300T2G8
with N
connector,
requires two
filters
Pass
Band
(GHz)
2.5-4.2
4.2-7.5 0.5 8.4-15 25
Insertion
Loss (dB
max)
0.5
Power
(fundamental
& harmonic,
watts, max)
600 & 300
average,
600 & 150
average,
S2K Supplied with two TF type externally mountable harmonic
filters and a switch kit that allows user to select an
appropriate filter band, high or low, via this TWTA.
Insertion loss when used with filters is maximum 1.5 dB.
See TF Type Filter Specifications table below; add 9 kg
(20 lbs).
S3P Minimum power output outside of the specified frequency
range:
2.0 – 2.1 GHz, 150 watts
2.1 – 2.2 GHz, 175 watts
2.2 – 2.5 GHz, 200 watts
7.5 – 8.0 GHz, 200 watts
S4P Minimum power output outside of the specified frequency
range:
7.5 GHz - 8.0 GHz, 200 watts.
Input
Connector
N male or N
female plus
supplied
adapter
Output
connector
N female
Size
L x W x D
(cm, in max)
15 x 4 x 14
6.0 x 1.5 x 5.5
15 x 2.5 x 14
6.0 x 1.0 x 5.5
Weight
(kg, lbs
typical)
3.2, 7
3.2, 7 1.3:1 2.5:1
Input
VSWR in
Pass
band
(typical)
1.3:1
Input
VSWR in
Reject
band
(typical)
2.5:1
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