9 COMMUNICATING AIDS

CUSTOMIZING TRANSMIT SIGNAL

CHARACTERISTICS

The quality of your transmitted signal is important, regardless of which on-air activity you pursue. However, it is easy to be casual and overlook this fact since you don’t listen to your own signal. The following sub-sections provide information that will help you tailor your transmitted signal.

■TX Filter Bandwidth (SSB/ AM)

Use Menu No. 22 to select one of the following transmit bandwidths: 2.0 kHz, 2.2 kHz, 2.4 kHz (default), 2.6 kHz, 2.8 kHz, or 3.0 kHz.

Bandwidth

Passband frequency

 

 

2.0 kHz

500 ~ 2500 Hz

 

 

2.2 kHz

400 ~ 2600 Hz

 

 

2.4 kHz

300 ~ 2700 Hz

 

 

2.6 kHz

200 ~ 2800 Hz

 

 

2.8 kHz

100 ~ 2900 Hz 1

 

 

3.0 kHz

10 ~ 3000 Hz 1

1If the Speech Processor is ON, the low-cut filter is set to 200 Hz for 2.8 kHz and 3.0 kHz.

■TX Equalizer (SSB/ FM/ AM)

Use Menu No. 21 to change the transmit frequency characteristics of your signal. You can select from one of six different transmit profiles including the default flat response. Selecting any of the following

items from the Menu causes “ ” to appear on the display.

• Off (OFF):

The default frequency response for SSB, FM, and AM.

•High boost (H BOOST):

Emphasizes higher audio frequencies; effective for a bassy voice.

•Formant pass (F PASS):

Improves clarity by suppressing audio frequencies outside the normal voice frequency range.

•Bass boost (B BOOST):

Emphasizes lower audio frequencies; effective for a voice with more high frequency components.

•Conventional (CONVEN):

Emphasizes by 3 dB frequencies at 600 Hz and higher.

•User (USER):

Reserved for the optional ARCP software. Off is programmed at the factory as a default.

Frequency Response Curves

Amplitude

Conventional

Formant pass

High boost

Off

Bass boost

Audio

0.7 2.2frequency (kHz)

TRANSMIT INHIBIT

Transmit Inhibit prevents the transceiver from being placed in transmit mode. No signal can be transmitted when this function is ON even if the PTT or [SEND] is pressed.

•TX Inhibit OFF: Transmission is allowed.

•TX Inhibit ON: Transmission is not allowed.

Switch the function ON or OFF via Menu No. 54. The default is OFF.

CHANGING FREQUENCY WHILE TRANSMITTING

Moving your frequency while transmitting is usually an unwise practice due to the risk of interfering with other stations. However, if necessary, by using the Tuning control you can change the operating frequency while transmitting. You also can change the XIT offset frequency while in transmit mode.

While transmitting, if you select a frequency outside the transmit frequency range, the transceiver is automatically forced to receive mode. If you selected transmit mode by pressing [SEND], transmission will not resume until you select a frequency inside the transmit frequency range, at which time you must press [SEND] again.

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