3. SWR Measurement
Do not turn on the transmitter, while the antenna and test meter
are disconnected.
To use this SWR meter, it must be connected to the antenna feet
line via a short coaxial cable, not longer than two feet.
With the transmitter off, disconnect the antenna coax cable from
the transmitter and connect the coax cable to the jack of the SWR
meter marked with ANT. Connect the short coax cable between
the transmitter and the TX-jack of the SWR meter.
> Place the sliding switch (5) [PWR/SWR] to SWR.
> Place the sliding switch (4) [FWD/REF] to FWD and adjust the
needle with the [CAL] (3) to SET at the right side of the meter.
> While the transmitter is on, place the sliding switch (4) to position
[REF] and read the standing wave radio on the upper scale (5).
SWR
reflected power SWR
reflected
power
1,0 :1
0 %
2,0 : 1
10 %
1,22:1
1 %
2,33: 1
16 %
1,5 :1
4 %
3,0 : 1
25 %
1,85:1
9 %
4,0 : 1
36 %
If the SWR is above 2:1 the antenna may need tuning or there
may be a problem in the antenna system (connectors).
Several antennas provide a means for tuning by either a slide
adjustment or a control at the base. For sliding antennas, sliding
¼'' each time and repeating the SWR measurement steps after
each adjustment. First, move the antenna inwards and observe
for an improvement in the SWR, than outwards if no improve-
ment is noticed. Select a center channel at the transmitter for the
measurements.
With 40 channel CB radios, channel 19 FM should be used for
adjustment. Then, check channel 1 and channel 40 for comparison.
With 80 channel CB radios, use channel 1 FM for adjustment
and channel 41 (26.565 MHz) and channel 40 (27.405 MHz) for
comparison.
manual_SWR-1180-W_new-mod:Layout 1 11/6/2013 11:08 AM Seite 13
