Q. P. Inc.
"DOSY METERS"
530 E. Lexington Ave. #155
Elkhart, IN 46516
(574) 295-6884
www.DOSY.com
DOSY TC-4002-PSW
Test Center
Instruction Manual
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.
Meter Scale Reading
0 - 20 Watts............................................................................................ 20 Scale
0 - 200 Watts ................................................................................. 20 Scale X 10
0 - 2000 Watts ..............................................................................20 Scale X 100
0 - 4000 Watts .....................................................................................4000 Scale
SSB Modulation Check
1. Turn Mode Selector Switch (#5 Fig. 1) to MOD position
2. Switch SSB/AM rocker (#6 Fig. 1) to SSB
3. For this test, the Transmitter must be in AM mode for setting modulation on
meter to the SET line position on meter. Make sure you use the lower scale
marked SSB MOD.
4. With Transmitter keyed, turn Mode Switch on Transmitter to either UPPER or
LOWER SIDE BAND and talk or whistle steadily into the microphone. Read
modulation on the lower scale of meter, marked SSB MOD.
A.M. Modulation Check
1. Turn Mode Selector Switch (#5 Fig. 1) to the MOD position
2. Switch Set/Modulation rocker (#4 Fig. 1) to SET
3. Switch Modulation Mode rocker (#7 Fig. 1) to AM
4. Turn RF Level control (#8 Fig. 1) to MIN
5. Key Transmitter and turn RF Level Control clockwise to read full scale to
SET line on AM Modulation Scale.
6. With Transmitter keyed, switch SET/MOD rocker (#4 Fig. 1) back to MOD
position and talk into the microphone or steadily whistle to read modulation
percentage on the AM Scale.
7. 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.
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