RS SX-600 Instructions page 2

V10967
An insertion type SWR/POWER meter being connected between a
transmitter and an antenna. Transmitting power and SWR can be
measured with very simple operations.
In addition PEP, (peak envelope power) on SSB mode can be
measured with PEP monitor function. With wideband and low insertion
loss directional coupler those measurements can be made with
minimum effect in the transmission line.
Before using the unit
1. Do not open the housing or touch any components inside, since it
may cause malfunction of the unit and measurement error. The
directional coupler section is not serviceable without specially
prepared measurement tools. Note that warranty will not cover a
unit which is modified in any part of the unit by a user.
2. The unit displays RF power at the input end of the system, if RF
power at the output end is required, subtract the amount equivalent
to the insertion loss from the displayed RF power.
3. When being operated on SSB mode, RF power displayed with PEP
MONI function is approximately 70 to 90 percent of peak power at
normal talking level. Because of the time constant in the CR circuit,
the unit is not able to display 100 percent peak power.
Note on operations
1. The unit has the following band coverage
S1 (Sensor 1): 1.8 —
S2 (Sensor 2): 140 —
2. Measurable power range of the unit is up to 200W in intermittent
mode. If transmitted on FM, CW, RADIO FAX or RTTY mode, do not
exceed its continuous maximum power at the following power
range. Otherwise the pickup unit of the directional coupler section
may burn out.
S1 (Sensor 1)
1.8 - 100MHz
100 - 160MHz
S2 (Sensor 2)
140 - 220MHz
400 - 525MHz
3. The unit contains a delicate meter mechanism, do not drop it or
subject it to severe mechanical shock.
Description of panel features
1. Meter
Displays forward RF power, reflected RF power and SWR.
Uppermost scale is for high (H) and low (L) power SWR reading.
Low power SWR scale is for RF power below 5W.
High power SWR scale is for RF power above 5W.
There are 3 scales for RF power measurement; 5W, 20W and 200W
full scale.
2. Range switch
Selects full scale RF power reading between 5W, 20W, and 200W.
3. Function switch
Selects measurement function between RF power and SWR.
4. Calibration Knob
Sets RF power to full scale reading depending on transmitting RF
power to measure SWR. Readings increase as the knob is turned
clockwise during transmission.
5. Power direction switch
Selects RF power measurement between forward RF power and
reflected RF power.
6. Average/PEP monitor switch
In ordinary RF power measurement set the switch to the (
to display average RF power.
In SSB RF power measurement, set the switch to the (
to display PEP RF power.
2
RS Stock No.
458-0623
160MHz
525MHz
100W
70W
150W
100W
) position
) position
7. Meter zero adjustment screw
Adjusts the meter indicator to zero position using a flat blade trimming
tool when the unit is not in use.
8. LED indicator
Selected sensor can be confirmed by the LED indicators.
9. Transceiver (for S1)
RF power input from radio equipment which is connected by 50 ohm
coaxial cable with UHF connector (plug).
10. Antenna (for S1)
RF power output to an antenna or a dummy load which is to be
connected by 50 ohm coaxial cable with UHF connector (plug).
11. Transceiver (for S2)
Refer to 9
12. Antenna (for S2)
Refer to 10
13. 13.8VDC
DC power source for meter illumination and LED display. Acceptable
DC voltage range is from 11VDC to 15VDC. Connect red line for
positive and black line for negative polarities. This power source is not
essential for measuring purposes.
14. Sensor selection switch
Select a switch which covers desired frequency coverage.
Installation
Connection
Connect transceiver input of the unit to the antenna output of the radio
equipment with a coaxial cable with an UHF connector and antenna
output of the unit to an antenna feedline or dummy load.
Measure forward RF power
Measures how much RF output power is being applied from the radio
equipment to an antenna. In the case of forward RF power, the higher
the RF power reading (W) the more RF power is applied to the antenna,
provided that reflected RF power is minimum.
1. Set the FUNCTION switch to the POWER position.
2. Set the POWER switch to the FWD position.
3. Set the RANGE switch to the appropriate RF power range. If radio
equipment is 10W RF output power set the switch to the 20W
position. If the equipment is 100W RF output power, then set the
switch to 200W position.
4. Ensure the antenna output is connected to an antenna or dummy
load.
5. Set the radio equipment on transmission, except SSB mode. The
meter indicates forward RF power proportional to the output RF
power of the equipment.
6. In SSB mode, peek envelope power can be monitored by setting the
AVG PEP MONI switch to the PEP MONI position and talking into a
microphone.
Measure reflected RF power
In the case of reflected RF power, the lower the measured reflected RF
power, the greater the efficiency of the connected antenna to propogate
transmitted power. Reflected RF power in this case is the amount of
transmitting power which can not be propogated by the antenna due to
propogation inefficiencies.
1. Set the FUNCTION switch to the POWER position.
2. Set the POWER switch to the REF position.
3. Set the RANGE switch to the appropriate RF power range. If radio
equipment is 10W RF output power, set the switch to the 20W
position. If the equipment is 100W RF output power, then set the
switch to 200W position.
4. Ensure the antenna output is connected to an antenna or dummy
load.
5. Set the radio equipment on transmission. Then the meter indicates
refected RF power.
6. If the meter does not indicate any power, set the RANGE switch to
the lower power range.