TN491 Modular 5-Pack Series High Power Amplifi ers
MT-3/4 Radio Systems
TECHNICAL NOTES
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CODANCOMMS.COMTECHNICAL NOTE:
TN491, REV 2-0-0, © Aug 2016
CANADA/US +1 250 382 8268 | TOLL FREE +1 800 664 4066
Models Available
A-RACK19-AMP-02 19” Subrack for 5-Pack Series Amplifi ers, holds up to 5 amps
AMP-140-100-D1M 5 Pack Series, 100 Watts continuous duty, 136 - 144 MHz
AMP-148-100-D1M 5 Pack Series, 100 Watts continuous duty, 144 - 152 MHz
AMP-157-100-D1M 5 Pack Series, 100 Watts continuous duty, 152 - 162 MHz
AMP-168-100-D1M 5 Pack Series, 100 Watts continuous duty, 162 - 174 MHz
AMP-428-100-D1M 5 Pack Series, 100 Watts continuous duty, 406 - 450 MHz
AMP-481-100-D1M 5 Pack Series, 100 Watts continuous duty, 450 - 512 MHz
AMP-817-080-D1M 5 Pack Series, 100 Watts continuous duty, 768 - 869 MHz
Power Amplifi er Operation
The Modular 5-pack Series high power amplifer has a heavy duty heatsink and an RF switched cooling fan. The
power amplifi er has four standard LEDs, and a summary alarm pin.
The LEDs operate as follows:
Label Color Description
DC ON Green Activates when DC power is connected.
LOW OUTPUT Red Activates when the output power drops to 80-85% of output power.
HIGH VSWR Red Activates when VSWR exceeds 2.5:1.
HIGH TEMP Red Activates when the amplifi er exceeds safe operating temperature.
The ALARM pin on the rear of the amplifi er operates as follows:
Pin Description
ALARM A summary alarm that activates (< 1 Vdc)when any of three alarm conditions activate
(Low Output, High VSWR or High Temp).
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