1
Chapter 1 Introduction
The Series 4410 Thruline Wattmeter is an insertion type RF wattmeter designed to
measure power flow and load match in 50 ohm RF coaxial transmission lines. Its
use is intended for CW unmodulated, or FM signals only. When used in a 50
ohm application with N type connectors, the Series 4410 has an insertion VSWR
of less than 1.05 for frequencies up to 1000 MHz. The meter has two scales, a 0
to 1 scale and a 0 to 3 scale. Power is read as a multiple of the value indicated by
the pointer, the decimal point location depending on the range switch setting
and the factor on the Plug-in-Element. Several of these Plug-in-Elements may be
selected to give this instrument a broad band spectrum with various power
ranges, see
"Specifications" on page 23
.
Description
The Series 4410 Thruline Wattmeter is a portable unit contained in a die cast
aluminum housing, with a formed sheet aluminum back closure. The unit is
equipped with a carrying strap, four rubber shock feet on the base, and four
rubber bumpers on the back, which allow the unit to stand in a vertical or
horizontal position. For additional protection, the microammeter is specially
shock mounted. A slotted screw is provided on the lower front face of the meter
for zeroing the pointer. Below the meter, the RF line section face protrudes
slightly from the wattmeter housing with the plug-in element socket in the
center. Mounted on the line section, inside the housing, is the circuit module
with an attached phosphor bronze spring contact finger, which protrudes
through a lateral hole and into the plug-in element socket of the RF line section.
The finger has a button on its end which makes connection with the contacts of
the plug-in element. The silver plated brass RF line section is precision made to
provide the best possible impedance match to the coaxial RF transmission line
in which the wattmeter is inserted. At each end of the line section are Bird
Quick-Change type RF connectors, which may be quickly interchanged with any
other Bird “QC” connectors.
Component Description
Meter 2 scale
Meter Housing Cast aluminum
QC Connector Interchangeable input and output
Range Switch OFF, Battery Check, Various Ranges
RF Line Section Element Port Accepts 4410 series elements
Rubber Feet Permit vertical or horizontal position and
operation
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