ITAM SWR-PRO-CB Standing Wave And Power Measurement Instruction Manual

ITAM SWR-PRO-CB Standing Wave And Power Measurement

Elements

1. TX socket
2. ANT socket
3. CAL adjustment
4. REF-FWD / 10W-100W switch
5. scale
6. SWR-PWR switch

OPERATION MANUAL

1. General

* The SWR-PRO CB is designed to measure the transmission power and the

standing wave ratio of radios that operate in the frequency range of 20-50 MHz. The SWR-PRO-CB is a compact dual-function test meter to indicate the condition of any CB antenna system and transmitter with an impedance of 50 Ohm. With the SWR-PRO-CB, it is possible to measure the standing wave ratio (SWR) of th? transmitter. This test instrument i? designed to be used for base station or mobile operation.

2. SWR Function

* Testing for the SWR or standing wave ratio, provides the operator of

the transceiver a good indication of the condition of his antenna and antenna lead cable. In order to get the maximum power radiated from the antenna, the coax cable and the antennas should be matched to the transmitter. A perfect match is never achieved. The amount of mismatch can be measu­red by _measuring the amount of standing waves that exist in the coax of the antenna feed line. Measuring of the standing waves can be accomplis­hed by sampling the forward FWD power and the reflected REF power and comparing them and then expressing this difference as a ratio of reflected to forwarded ·power. In the taqle 1 are some examples of the amount of power
· loss for a standing-wave ratio.

3. SWR Measurement

* Do not turn on the transmitter, while the antenna and test meter are

dis-connected.
To use this SWR meter, it must be connected to the antenna feet line with 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 (2). Connect the short· coax cable between the transmitter and the TX-jack ( 1) of the SWR meter. If a long antenna coax cable is used and the antenna should be matched, the measurement is more exact if the short coax cable is connected between the antenna and the ANT jack at the SWR meter. With this setup the an­tenna coax cable does not influence the measurement.

* Place the sliding switch (4) [FWD/REF] to FWD.

* While pressing the radio’s PTT, turn the calibration knob [CAL] (3)

until the needle reaches the infinity symbol oo at the end of the scale.

* Now, place the switch (4) [FWD/REF] to position [REF]. While still

holding the radio’s PTT, the standing-wave-ratio can be read at the lower part of the scale (6).
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 improvement is noticed. Select a center channel at the trans ­mitter-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 (27.495 MHz) for comparison.

4. Power Meter Function

* The power meter function is provided to monitor the condition of the

trans­mitter by measuring the relative power being generated in the transmitter. This meter will measure up to 10 or 100 Watt RF power (max. 150 W), de­pendent of the position of the sliding switch (4) [10W/100W].

* Supplied tx power should not exceed 150 Watts!

5. Power Measurement
   Do not turn on the transmitter, while the antenna and test meter are dis­connected.

Connect the meter with the transmitter and the antenna in the same way as for the SWR measurement.

For measuring of standard CB transmitter with 4 Watt RF power, place the sliding switch (4) [10W/100W] to the 10W position.
Turn the transmitter on and read the power from the upper scale (W) (6).

Unusual, high measured power, above the rated power of the transmitter could indicate a faulty antenna system. Check all connectors for unsatis­factory connection.

Specifications

range 1 :1 bis 1 :3

frequency Range 20-50 MHz

impedance:50 Ohm

tx power:0.5-10 W / 100 W (max. 150 W)

dimensions;130 x 60 x 35 mm

weight;246 gr

CONTACTS

TEAM Electronic GmbH Bolongarostrae 88
D-65929 Frankfurt am Main Germany

fon; + +49 – 69 – 300 9 500

fax: +49 – 69 – 31 43 82

web:www.team-electronic.de

email:team-electronic@t-online.de 

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