ZETRON MT-4 Technical Notes

TN442 AMP-4 700-800 MHz 25 Watt Power Amplifi er
POWER AMPLIFIER
FREQUENCY (MHz)
TX
RF OUTPUT
G/F
PWR CTRL
RF INPUT
MADE IN CANADA
MODEL # CODE
Specifi cations
Frequency Band
RF Output Power
RF Input Power Range (from exciter)
Duty Cycle
Conducted Harmonics
Intermodulation Attenuation
Thermal
Fan
VSWR Protection
Operating Temperature
Output Impedance
Supply Voltage
Standby Current Drain
Transmit Current Drain
Models Available
AMP-4-800-30-00
Guide Rails in Subrack for Power Amplifi er:
The AMP-4 is installed in the subrack (taking up a transmitter and receiver slot) and is mated with a transmitter
exciter. Additional guide rails are required to be mounted in the subrack to support the AMP-4 properly. The
amplifi er can be mounted in slot "A" or slot "B" in the subrack. A guide strip at the top of the subrack will help to
place the guide rails in the proper position by following the numbers on the guide strip. Only the top portion of the
subrack is labeled. Guide rails must be added or removed in the same position on the bottom as on the top.
Remove any guide rails that were used to hold the AMP-2 amplifi er. These guide rails will be located at number
20/21 for slot "A" and number 48/49 for slot "B". Install guide rails at number 11/12 and 34/35 for slot "A" and number
39/40 and 62/63 for slot "B".
TECHNICAL NOTE:
TN442, REV 1-0-0, © Mar 2025
CANADA/US
+1 250 382 8268
The AMP-4 25 Watt power amplifi er operates in the frequency band 768 to 869
MHz. The power amplifi er is rated for continuous duty at an adjustable RF output
power of 20 to 30 Watts. The output power is adjusted by using the front panel
potentiometer. The AMP-4 was designed to mate with any of the MT-4 transmitter
exciter modules.. The input to the power amplifi er cannot exceed 3.0 Watts.
768 - 869 MHz
20 to 30 Watts adjustable; 25 Watts nominal
2.0 to 3.0 Watts
100% (-30°C to +50°C)
≤ -67 dBc
≥ 40 dB
Thermal interlock disables @ +80°C (± 5°C) / +176°F
Resets at +70°C (± 7°C) / +158°F
Fan activates @ +60°C (± 5°C) / +140°F
Resets @ +40°C / +104°F
≤ 20:1 VSWR (All Phase Angles)
-30°C to +60°C
50 
+13.8VDC (Nominal); +10.5 to +16.6VDC (Operating)
≤ 15 mA
≤ 9.50 A
FM, 20 - 30 Watts continuous duty, 768 - 869 MHz
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TECHNICAL NOTES
MT-4 Radio Systems
LMRSALES@ZETRON.COM
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