Dosy TC-4001 User manual

Welcome to the online version of your DOSY Manual.
We hope that you find this helpful and informative.
Visit us on the Internet at:
www.DOSY.com

Q. P. Inc.
"DOSY METERS"
530 E. Lexington Ave. #155
Elkhart, IN 46516
[phone]
www.DOSY.com
DOSY TC-4001
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.

123
45678
Installation Instructions
The test center can be installed at any point in
your transmitter line.
Operating Instructions
Watts
Starting Tips
1. Set SWR and MOD RF level control to minimum.
2. Set Range Switch to 2000.
3. Set SWR and MOD functions on each Range to
prevent damage to the meter movements.
The TC-4001 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 2000 watts, just set the Mode Selector Switch
(#5 FIG. 1) to the appropriate range: 20, 200, 2000 watts.
SWR Set
1. Turn Mode Selector Switch (#5 Fig. 1) to SWR-SET Position.
2. Turn SWR RF Level Control (#1 Fig. 1) to Min.
3. Key transmitter and turn SWR RF Level Control clockwise
(#1 Fig. 1) to give a full scale meter reading to Set Line on
the SWR Meter (#1 Fig. 1).
4. With Transmitter keyed, switch Mode Selector Switch (#5
Fig. 1) to the 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.
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 (#6 Fig. 1) to AM
4. Turn RF Level control (#1 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.
NOTE: A.M. modulation check functions must be performed
on each wattage range, to prevent possible damage to the
meter movements.
Transmitter DOSY Test Center
RG/58BU
Input Antenna
If wattage to measure is larger than 2000 watts, the 2000/
4000 switch (#3 Fig. 1) must be switched to 4000. When
returning back to the 2000 watt scale, you must return the
switch (#3 Fig. 1) back to the 2000 watt setting.
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.
1. RF Level Control
Modulation and SWR
2. RMS/PEAK Mode Switch
3. 2000/4000 Watt Range
Switch
4. SET/MOD Switch
5. Mode Selector Switch
6. SSB/AM Mode Switch
Figure 1