6 Commands
62
6.40 FAX
In the main menu (cmd:) FA Allows slight to moderate adjustment of the frequency
response of the PACTOR-3 transmit signal.
Some IF filters used in standard SSB transceivers already attenuate the edges of only 2
kHz wide signals due to a poor frequency response. As a countermeasure EQ allows to
compensate for this effect. Please do only use the EQ command if you really know the
actual transmit frequency response of your transceiver.
X leads to the fax:-menu. The command prompt takes the form fax: (in the fax menu
other modes are also available, so basicly ist not meant as a FAX-only menu).
The following commands are available in the fax:-menu.
Mode commands:
Amfax, Fmfax, Jvfax, Sstv, FSk, Comparator, PR300.
Parameter commands:
AGain, AResolut, FResolut, SResolut, FSKBaud, Deviation, MBaud,
SMode, HSynch, JSynch, TXcomp.
All other (normal) commands of the PTC-IIIusb are no longer available for use in the
fax:-menu! You can leave the fax:-menu with the Quit or the DD command.
For a detailed description of the FAX and SSTV commands refer to chapter 10.
6.41 FEc
This command starts an AMTOR FEC transmission (Mode-B). When the AMTOR
prompt is active, then this command has the same effect as the CHANGEOVER
character.
After approx. 4 minutes of pure idle transmissions, an automatic QRT is carried out.
6.42 FSKAmpl
Default setting: 60
Parameter: X 30... 3000, AF output voltage (peak to peak) in mV.
This serves to set the Audio output (transmitted signal) of the PTC-IIIusb for all non PSK
modes. Before this value is changed, the PSK amplitude should have been correctly set
(see PSKAmpl command, chapter 6.70, page 75).
After the PSK amplitude has been correctly set, the transceiver MIC gain control
should not be further adjusted to attain the required power output for non PSK modes.
For this adjustment, (i.e. FSK/CW output power) exclusively use the FSKAmpl
command. The transceiver should be connected either to a dummy load of appropriate
power handling capacity, or a well matched antenna. (please pay particular attention that
the chosen frequency is really free. Using U 1 <Return> the Unproto mode 1 is started
(100 Bd FSK). Now, using the FSKAmpl command, (use the ESCAPE character to enter
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