Installation and Connection
and Operation
Your Mobile Radio
Installation and Connection
•
If you are having difficulties in adjusting your antenna, check the following:
1.All doors must be closed when adjusting the antenna.
2.Make sure the antenna base is grounded.
3.Check your coaxial cable routing — it may be pinched where routed into the car.
4.Try a different location on your car — keeping in mind the radiation pattern you want.
5.Make sure the antenna is perfectly vertical.
6.Try a different location in your neighborhood. Stay away from large metal objects (metal utility or light poles, fences, etc.) when adjusting.
NOTE
The radio will operate into a SWR of 2 to 1 indefinitely and sustain an SWR of 20 to 1 for a maximum of 5 minutes at rated operating conditions.
- -4External Speaker
The external speaker jack (EXT) on the rear panel is used for remote receiver monitoring. The external speaker should have 8 ohms impedance and be able to handle at least four watts. When the external speaker is plugged in, the internal speaker is disabled.
- -4Public Address
To use the transceiver as a public address system, connect an external 8 ohm speaker that is able to handle at least four watts to the PA jack on the rear panel. Direct the speaker away from the microphone to prevent acoustic feedback. Physical separation or isolation of the microphone and speaker is important when operating the PA at high output levels.
Operation
•
There are 15 controls and 4 indicators on the front panel of your mobile radio. These are shown in the illustration on page A2 which may be folded out for reference when using this section.
Controls
Your Mobile Radio
Controls | • | |
- - | ||
| ||
4Off / On / Volume |
| |
Turn clockwise to apply power to the unit and to set the desired listening level. |
| |
During normal operation, the volume control is used to adjust the output level |
| |
obtained either at the transceiver speaker or the external speaker, if used. |
| |
- - |
| |
4Squelch |
| |
This control is used to cut off or eliminate receiver background noise in the absence |
| |
of an incoming signal. For maximum receiver sensitivity, it is desired that the control be |
| |
adjusted only to the point where the receiver background noise or ambient background |
| |
noise is eliminated. Turn fully counterclockwise, then slowly clockwise, until the receiver |
| |
noise disappears. Any signal to be received must now be slightly stronger than the |
| |
average received noise. Further clockwise rotation will increase the threshold level |
| |
that a signal must overcome in order to be heard. Only strong signals will be heard |
| |
at the maximum clockwise setting. |
|
- -4Microphone Gain
Adjusts the microphone gain in the transmit and PA modes. This controls the gain to the extent that full talk power is available several inches away from the microphone. In the Public Address (PA) mode, the control functions as the volume control for the PA speaker.
-
Used to reduce the gain of the RF amplifier when receiving very strong signals.
- -4PA / AM / FM
Selects the mode of operation. In the AM and FM positions, the PA function is disabled and the unit will transmit and receive on the internal speaker. In the PA mode, incoming transmissions will be heard through the PA speaker. This allows you to monitor messages while outside of your vehicle. To use the PA feature, a speaker having a voice coil impedance of 8 ohms and a power handling capability of at least four watts should be used. This speaker must be plugged into the PA SPKR jack at the rear of the transceiver. If the public address feature is to be used primarily for outdoor applications, the use
of a weatherproof
of isolation required. Some experimentation will determine the minimum amount of isolation required for a given sound level from the public address system.
NOTE
The microphone gain knob also controls the PA volume when in PA mode.
| 8 English | Nothing comes close to a Cobra® 9 |
|
