Preferences

Several different sets of preferences may be set, one for each mode of operation, plus a few general settings. They are described below.

General Settings:
Timing Delta - Used to correct the slight variance in timing between different computers. This value is automatically set by the Calibration mode. See the section on that mode for more information.

Tuning Indicator- Displays a spectrum tuning indicator on the right side of the Signal Window, which can help in tuning in RTTY and CW stations. As this does take extra processor power, users with slower systems may want to disable it.  

Call- You can enter your callsign into this field. In SSTV mode, your callsign will be placed into the header of any pictures transmitted.  

CW Settings:
Center Freq - Sets the frequency that MultiMode uses for morse code mode, both for transmission and reception. You can set this frequency to the center of the bandpass filter in your rig, or to your personal taste.

RTTY Settings:
Center Freq - Sets the center frequency that MultiMode uses for RTTY/ASCII/SITOR modes, both for transmission and reception. The mark and space tones are centered around this frequency. You can set this frequency to the center of the bandpass filter in your rig, or to your personal taste.

FAX Mode Settings:

Auto-save Faxes - When a fax is received while in Auto mode, it will be saved to disk automatically. The file name will be in the format “ddMonYear hhmmZ”. For example: 10Jan1999 2330 for a file saved on January 10, 1999 at 2330 hours local time. Faxes are saved as PICT files. 

Select Fax Image Folder- Clicking this button allows you to select where MultiMode should auto-save faxes. If you select this mode by checking the above box, make sure that you select a folder for storing the received faxes. The full pathname of the folder is displayed on the following line, for your reference.

ACARS Mode Settings:

Use ACARS.LST Plane Listing File - Instructs MultiMode to check the plane’s registration number against the plane listing in the ACARS.LST file, to print additional information. See the ACARS documentation section for more details.

Replace chars with parity error with ~ - Characters which are received with parity errors will not be printed, instead a tilde (~) character will be printed.

Suppress packets with parity errors - Packets with parity errors will not be displayed. Useful to suppress garbled packets.

Use DACARS Format - Alters the format of displayed packets, to more closely match the format required by the DACARS program, a shareware program for the PC which 

Sound Input Settings:

Enable Sound Play-Thru - Checking this box enables the audio from your radio (through the microphone input) to be played out your Mac’s sound output, to any external speakers you may have.

Enable AGC - Enables the Automatic Gain Control (AGC) of your Mac’s sound input port, if it has this ability.

Transmit:

Loopback Audio- Causes transmitted audio to be looped back (internally inside MultiMode) to the sound input, so that you can monitor what you're transmitting. Very useful for SSTV mode, to receive the image as you send it.

Serial Port- Indicates which serial port (if any) should be used to provide the Morse code output. The data transmit line of the selected port is used. If you’re not interested in transmitting Morse code, then select None. Selecting a port will result in MultiMode using that serial port, which could cause problems if you’re actively using that port for printing or a modem. Only one application can use a port at a time on the Mac.

USB serial adapters are supported effective with MultiMode version 3.7.0. MultiMode has been tested with the Keyspan Twin Serial Adapter on both desktops and the iBook. NuBus or PCI serial port cards may also work.

Up to four serial devices are displayed as options. If your Mac has fewer than four serial ports, then some of the options will be blank and dimmed out.

Note: If you change the selected serial port, you must quit and restart MultiMode for the change to take place.