Bedienungsanleitung Cobra 150 GTL DX (Seite 9 von 17) (Englisch)

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Controls

English

Controls

•

4RF Power Hi / Low

Places the transmitter in high power (15 watts) mode when the switch is in

the

hi position and in low power (4 watts) mode when it is in the low position.

4S/RF / SWR / CAL

When this switch is in the S/RF position, the display meter swings proportionally

to the strength of the signal received or the output power being transmitted.

When it is in the

SWR position, the standing wave ratio is measured on the display meter.

When it is in the

CAL position, the SWR function can be calibrated on the display

meter by adjusting the SWR CAL control to move the needle to the calibration mark

on the display meter face.

4Dim

Adjusts the NightWatch™ panel and meter brightness from min. to max.

The antenna warning LED is not affected by this control.

4SWR CAL

This control is used in conjunction with the S/RF / SWR / CAL switch to calibrate the

standing wave ratio circuit to full scale on the display meter in preparation for measuring

the standing wave ratio that the antenna is presenting to the transceiver.

The standing wave ratio can be checked to insure that maximum power is being radiated

for the longest signal range. The antenna must be in good condition, properly adjusted

and matched to your transceiver. The SWR function of the display meter lets you easily

measure your antenna condition. To operate this function, select a frequency near the

middle of the range such as 28.850 MHz or the one you plan to use most. With the power

on, set the S/RF / SWR / CAL switch to the

CAL position. Press and hold the microphone

Press-To-Talk button and, using the SWR CAL knob, adjust the meter to the

CAL position

indicated on the display meter. Then, while releasing the microphone button, switch the

S/RF / SWR / CAL switch to the

SWR position. Again press and hold the microphone

Press-To-Talk button and read the SWR indicated. Lower figures are the better, with 1

being ideal. Generally, readings up to 3 are acceptable, but a reading greater than 3

indicates that you are losing radiated power and antenna adjustment may be advisable.

Controls

•

4NB/ANL / ANL / Off

When this switch is in the ANL position, only the automatic noise limiter in the audio

circuits is activated. When the switch is placed in the

NB/ANL position, the RF noise

blanker also is activated. The RF noise blanker is very effective for repetitive impulse

noise such as ignition interference. When the switch is in the

off position, both the

noise blanker and the automatic noise limiter are disabled.

4Echo

This control is used to adjust the output level of the echo circuit. It is also detented

at the fully counter clockwise position to turn off the echo circuit.

4Talk Back

This control is used to adjust the desired amount of modulation talk back that is

present at the speaker during transmit.

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Cobra 150 GTL DX Seite 9

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