Bird Technologies 4331 - Manual (Page 56)

Series 4520 Thruline Wattmeters
The Series 4520 RF Thruline Wattmeter units are essentially the same as
the Model 43 Wattmeter, in that their electrical components and performance
characteristics are alike. These models are panel mounted for rack-type
installation instead of the all purpose portable housing of the Model 43
Wattmeter. Except for the Model 4527, which has an added feature of a
Female BNC RF Sampler output connector on the panel, the data and
operating instructions contained in this instruction book are applicable to
the Models 4521/22/23/25/26/27 in all respects, except as explained in the
following:
These units are intended for fixed installation, generally in rack mounts
requiring 19 inch panels. According to each of the model types concerned,
the various panels are punched out for the component arrangements involved.
The first line of the Replacement Parts List attached, lists the panel styles
for the respective Models 4521, 4522, etc. The remainder of this list carries
the replaceable items for each model. Only those items that are referred to
in this attached parts list, apply herein. The schematic diagram figure in
this instruction book is not applicable to these units.
Installation
Four 12-24 machine screws fasten the wattmeter panel in the selected
position on a relay rack, using the pattern of tapped holes regularly provided
in standard racks.
1. Choose a location for easy reading and operation of the
wattmeter; try to place it where the coaxial cable lengths
will be short and may be installed without sharp bends.
2. Avoid the use of angles and adapters.
3. Ensure all cable plugs and connectors are screwed on se-
curely.
Bird Model 43 Wattmeter
42