Cobra Electronics 200GTL DX - Manual (Page 9)

11 Nothing comes close to a Cobra ®
Controls
10 English
Controls
Controls
•
- - High Power
Places the transmitter in high power (30 watts) mode when the button is pressed to
the in position and in low power (4 watts) mode when the button is in the out position.
- - SWR / S/RF
When this button is in the S/RF (out) position, the display meter swings proportionately
to the strength of the signal received or the output power being transmitted.
When the button is in the SWR (in) position, the standing wave ratio is measured
on the display meter.
- - Dim / SWR CAL
Adjusts the NightWatch™ panel and meter brightness in steps from min. to max.
when this button is pressed and released repeatedly. The antenna warning LED is
not affected by this control.
To place this control in the CAL position, press and hold the button. The SWR
function can then 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.
- - SWR CAL
This control is used in conjunction with the DIM / SWR CAL button 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, press and hold the DIM / SWR CAL button. 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, release the microphone
and DIM / SWR CAL buttons. Press the SWR / S/RF to the in position and 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. When finished, return the
SWR control to the minimum position.
Controls
•
- - NB / ANL
When this button is in the ANL (in) position, only the automatic noise limiter in
the audio circuits is activated. When the button is in the NB/ANL (out) position,
the RF noise blanker also is activated. The RF noise blanker is very effective for
repetitive impulse noise such as ignition interference.
- - Echo
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.
- - R Beep
When this button is pressed to the in position, the radio will insert a tone
(Roger beep) to indicate the end of each transmission as the Press-To-Talk
button on the microphone is released.
When the button is in the out position, the tone function will be off.
- - Clarifier
The clarifier function is used to make small adjustments in frequency
when using the radio in single sideband mode (USB or LSB). Thereby,
the receiver can be matched to the signal being received for the best
voice clarity at the speaker.
The outer ring makes coarser and the inner knob finer adjustments.
Both controls increase frequency when turned clockwise and decrease
it when turned counter-clockwise.
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