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1. OPERATION
13
1.13 ISB Function
The frequency of certain SSB multiplex broadcasts (fax and teletype) randomly shifts 1-2 kHz. To
receive these broadcasts steadily, enable the ISB* function to track frequency.
* ISB is a single sideband mode which is used with some SSB transmissions. Normally each side-
band carries identical information, but ISB modulates two different input signals - one on the upper
sideband, the other on the lower sideband.
1.13.1 Enabling, disabling ISB function
1. Press the PRG key followed by the 6 key.
2. Press the 1 or 2 key to disable or enable the ISB shift function, respectively.
3. Press the E key.
4. Press the C key.
When the ISB function is enabled, the ISB shift width set in the procedure below is applied to the
frequency shown on the frequency display. Further, the frequency shift is applied to ALL channels.
1.13.2 Set ISB shift width
Set the ISB shift width (from nominal frequency) to use as follows:
1. Press the PRG key followed by the 6 key.
2. Press the 3 key to choose QTY.
3. Press the REV/
z
key to display the + or – sign as appropriate.
4. Enter ISB shift width in two digits, using the numeric keys.
5. Press the E key.
6. Press the C key to return to the standby display.
ISB +0.0kHz : OFF
1-OFF 2-ON 3-QTY
SET ISB in 2FIGS
+/- by
KEY