Installation Instructions
The test center can be installed at any point in
your transmitter line.
Transmitter
DOSY Test Center
RG/58BU
Input
Antenna
Operating Instructions
Watts
The PM-1000/PM-2001 Test Center will indicate the power
output (in watts) of your equipment at the point in the
transmission line where you have installed the test center. To
measure any power from 1 to 1000 watts (2000 watts on
PM-2001), just set the power range selector switch (#3 Fig. 1)
to the appropriate range - 30, 100, 1000 (or 20, 200, 2000 on
PM-2001) watts. Key the transmitter and read the wattage on
the corresponding scale.
NOTE: If power output is uncertain, use the highest range
and work down until the range is appropriate to prevent
possible damage to the meter movement.
SWR Set
A.M. Modulation Check
1. Turn Mode Selector switch (#3 Fig. 1) to the SWR SET position
2. Turn RF Level Control (#1 Fig. 1) to MIN
3. Key Transmitter and turn RF Level Control (#3 Fig. 1) to give
a full scale meter reading to SWR SET on meter scale.
4. With Transmitter keyed, switch Mode Selector Switch
(#3 Fig.1) to SWR position and read SWR ratio directly on
SWR Scale.
NOTE:
The SWR Functions need to be performed on each wattage range
to prevent possible damage to the meter movements.
1. Turn Mode Selector Switch (#3 Fig. 1) to MOD position
2. Switch MOD/SET rocker (#2 Fig. 1) to SET
2. Turn RF Level Control (#1 Fig. 1) to MIN
3. Key Transmitter and turn MOD RF Level Control (#1 Fig. 1)
to read full scale to MOD SET on meter scale
4. With transmitter keyed, switch MOD/SET rocker (#2 Fig. 1)
to MOD position and talk or steadily whistle into
microphone. Read modulation percentage on AM MOD
scale
5. DO NOT CHECK MODULATION WITH HIGH POWER
NOTE:
A.M. modulation check functions must be performed on each
wattage range, to prevent possible damage to the meter movements.
General Notation
On Grounded Grid amplifiers, we do not recommend checking modulation
at higher powers. Grounded Grid amplifiers will not be able to output 100%
modulation in the A.M. mode, however, the feed through power prevents
the grounded grid from being fully modulated. This is the reason A.M.
modulation should be checked at the transmitter, or with the Linear
Amplifier in standby position.
Peak Watts
The PM-1000/PM-2001 watt meter will indicate peak watts
when transmitter is modulated.
Figure 1
2. Rocker Switch for Modulation
and set
3. Mode Selector
Switch
1. RF Level &
Modulation Set
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