Atec pa-840 User Manual

Features

Broadband - 18 GHz - 40 GHz

High Gain - 25 dB typical

Gain Flatness - ± 2.5 dB.

Three Year Warranty

Preamplier

PAM-840

Description

The preamplier model PAM-840 is a broadband,
high gain, bench top microwave preamplier speci­cally made for EMC emissions testing applications.
It also can be used for other applications that require
signal amplication within its operating range. It has
an operating frequency range of 18 GHz to 40 GHz.

The PAM-840 has a gain variation of less than 2.5
dB for the entire frequency range with noise gure of
less than 3.7 dB, which the PAM-840 a good bench
top instrument for increasing measurement sensitivity
of analyzers and receivers to low amplitude signals.

It has simple front panel consisting of two 50 Ω K
type input and output connectors and power switch
with indicator light. Power to the unit is supplied by
an external wall mount adapter.

Each preamplier is individually calibrated. The data
and certicate of calibration is shipped with the unit.

The PAM-840 is an excellent addition to a measurement
systemx that uses Com-Power AH-840 or AH-826 and
AH-640 horns.

Application

Finding it difcult to measure low amplitude signals
radiating from equipment under test (EUT) is a com­mon problem faced by most EMC test engineers.
This problem is more evident when testing products
above 1 GHz. A high gain preamplier amplies the
received signal before it reaches the receiver input so
that it can seen above the noise oor. Otherwise, these
signal will be completely missed during measurment.

For example, Horn antennas are recommended for
EMC measurements above 1 GHz. In a typical test
seup the receiving horn antenna is placed at a distance
about 1-3 meters from EUT and connected to the re­ceiver via cable of sufent length. This arrangement
reduces the signal level at the receiver input due high
antenna factors and cable loss. A standard horn antenna
operating above 18 GHz can an have antenna factors
as has high as 40 dB/m in addtion to cable losses that
can be signincant.

Some requirements specify extremely low emissions
limits, making measurement sensitivity even more
critical. Without a preamplier, the noise oor of the
receiver may exceed the test limits.

Com-Power Corporation (174) 528 - 8800 www. com-power.com [e-mail]