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nstruction Manual SWR-HF7000
I
1. General
The maximum communication range depends mainly on the type of antenna, the location of the antenna and the setup
of the antenna. The SWR-HF7000 is a two function test meter for SWR & Power. It indicates the condition of the anten-
na and transmitter with an impedance of 50 Ohm. It is possible to measure the Standing Wave Ratio (SWR), the rela-
tive output power of the transmitter and the reflected output power from the antenna. The test-instrument is designed
to be used for base stations or mobile operations. The meter SWR-HF-7000 is suitable for transceiver on 1.8 - 200 MHz
(such as CB radio on 27 MHz) or for UHF / VHF transceiver on 140-525 MHz.
To radiate the maximum RF power produced of the transceiver by electro magnetic waves through the antenna and to
receive all signals the antenna and antenna cable must be adjusted to the transceiver.
The adjustment means, that the transceiver, connector, antenna cable and antenna will have the same impedance at
50 Ohm. In case of mismatching adjustment the RF output power will be reflected to the transceiver. The reflection must
be kept as low as possible. A 100% adjustment is not possible. By using SWR-HF7000 it is possible to control the
adjustment and to arrange new precise adjustment if necessary.
2. Feature & Controls
The SWR-HF7000 is equipped with an illuminated scale. The upper scale
∞.
1 -
The lower scale
2
is showing the RF output power range 0 - 200 W / 0 - 20 W / 0 - 5 W. For illumination of the
scale it becomes necessary to connect the meter
power lead. Please pay attention about polarity RED = PLUS / BLACK = MINUS.
2
1
5
8
9
13
12
11
1
is showing the standing wave ratio SWR
8
at a suitable power supply unit (DC 11-15 V) by the attached DC
7
6
3
4
11
3. Preparing SWR- & Power Measurement
The SWR-HF7000 provides measurement of the standing wave ratio and RF power. For the measurement an addi-
tional jumper coaxial cable of max. 60 cm is necessary for the connection between the meter and the transceiver. The
switched off radio shall be connected at the socket
MHz. The connector of the antenna shall be plugged in the socket
MHz or 140 - 525 MHz. . After measurement the connection between antenna and transceiver should be disconnected
to prevent any disturbance of other radio devices.
4. Measuring of SWR and Power
After the meter has been firmly connected to the antenna and the radio the measurements can be started. However, at
first it is advisable to check the 0-setting of the scale. If necessary, it can be carefully re-adjusted by using a suitable
8
screw driver at the scale adjustment
.
4.1 Measuring of the transmitting power
1.
Switch on the radio and set centre frequency of the radio.
2.
Set the slide switch 'SENSOR'
on the rear side of the meter either on position 1 (1.8 - 160 MHz) or on
9
postion 2 ( 140 - 525 MHz). The LED
indicates the selected frequency range.
4
2.
Set the slide switch 'FUNCTION'
of the meter in position 'POWER'.
3
3.
Set the slide switch 'POWER'
of the meter in position 'FWD'.
5
4.
Set the slide switch 'RANGE'
of the meter in position of the maximum TX power
provided by the connected radio (for example CB radio with 4 Watts TX power set the
range at the meter on 5 Watts).
5.
Now the actual TX (RF) power is shown on the scale
to talk button of the radio.
6.
For measurement of unmodulated TX power in SSB mode the key 'AVG / PEP MONI'
not pressed in position 'AVG'.
For measurement of modulated peak TX power in SSB mode the key 'AVG / PEP MONI'
must pressed in position 'PEP MONI'. While pressing the push to talk button of the radio
and talking into the microphone the modulated SSB TX power is shown on the scale of the meter.
4.2. Measurement of reflecting transmitting power
The measurement of the reflecting transmitting power is showing the reflected TX power and not the transmitting
power radiated. The good quality and alignment of the antenna will provide low TX power reflection. The measure-
ment of reflecting transmitting power will be arranged as follows:
1.
Switch on the radio and set centre frequency of the radio.
3
2.
Set the slide switch 'POWER'
of the meter in position 'REF'.
3.
Set the slide switch 'RANGE'
5
of the meter in position 'of the maximum TX power
provided by the connected radio.
4.
While pressing the push to talk button of the radio the reflected TX power will be shown
of the scale of the meter.
5.
If not TX power is indicated the next lower range must be selected by the slide switch
5
'RANGE'
.
4.3 Measurement of Standing Wave Ratio -SWR-
The standing wave radio -SWR- is the result of the effective voltage of the forwarded and reflected wave between the
radio and the antenna. The SWR between radio and antenna must be adjusted according to the instruction for the
antenna otherwise radio and antenna are mismatching. The best performance is SWR 1:1 without any reflection.
In case of mismatched adjustment there is a entire reflection and the SWR is at infinity. The measurement of SWR
will be arranged as follows:
1.
Switch on the radio and set centre frequency of the radio.
4
2.
Set the slide switch 'FUNCTION'
of the meter in position 'CAL'.
3.
While pressing push to talk button of the radio turn the 'CALIBRATION CONTROL'
clockwise until the needle reaches the position
4.
While the radio remains on transmitting mode the slide switch "FUNCTION"
position CAL into position SWR. Now the SWR will be shown at the scale
5 Watts read SWR on scale "L" and in case of TX power over 5 Watts read SWR on scale "H".
of the meter marked "TX" either for 1.8 - 160 MHz or 140 - 525
1 1 1 1
of the meter marked "ANT" either for 1.8 - 160
2
of the meter while pressing push
7
remains
7
6
on right hand side of the scale.
4
has to be changed from
1
. In case of TX power below
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