Last night I was encouraged after reading the article in the December
QST with the title Ghost QSOs.  The author reports using the Olivia
digital mode on a fixed channel and making contacts where signals could
not be heard in the receiver and where nothing is seen on the graphical
waterfall.  

I also wrote and got a reply from the author of fldigi.  He seems
willing to add additional keyboard shortcuts to the software.  I have
not received signals yet, but it sounds promising.


Here are some he told me about.

From W1HKJ

Here are a few keyboard shortcuts that are not well documented.

When the mouse cursor is in the waterfall area the following shortcut
keys apply:

Ctl-left arrow - move 1 Hz lower on the waterfall
Ctl-right arrow - move 1 Hz higher on the waterfall
Shift-left arrow - move 10 Hz lower on the waterfall
Shift-right arrow - move 10 Hz higher on the waterfall

Pause/Break key - a transmit / receive - pause button.  
if you are in the receive mode and press the Pause/Break key the program
will switch to the transmit mode.  It will begin transmitting characters
at the next point in the transmit buffer following the red (previously
sent text).  If the buffer only contains unsent text, then it will begin
at the first character in the buffer.  If the buffer is empty, the
program will switch to transmit mode and depending on the mode of
operation will send idle characters or nothing at all until characters
are entered into the buffer. 
if you are in the transmit mode and press the Pause/Break key the
program will switch to the receive mode.  There may be a slight delay
for some modes like MFSK, PSK and others that require you to send a post
amble at the end of a transmission.  The transmit text buffer stays
intact, ready for the Pause/Break key to return you to the transmit
mode. 
Think of the Pause/Break key as a software break-in capability. 
Esc key-  
Abort transmission. - immediately returns the program to receive,
sending the required post amble for those modes requiring it.  The
transmit buffer is cleared of all text. 
Triple press on Esc - terminates the current transmission without
sending a post amble - The PANIC button. 
Ctrl-R will append the ^r (return to receive) at the end of the current
text buffer.
Ctrl-T will start transmitting if there is text in the transmit text
window.
Alt/Meta-R will perform the same function as the Pause/Break key

Tab moves the cursor to the end of the transmitted text (which also
pauses tx). A tab press at that position moves the cursor to the
character following the last one transmitted. 

In the CW mode the TAB key causes the program to skip over the remaining
text in the transmit text buffer.  The text that is skipped will be
color coded blue.  The program remains in the transmit mode (PTT
enabled), but since the buffer is now empty no A2 CW signal is
generated.  Code transmission will then restart with the very next
keyboard closure of a valid CW character.  The Escape and Pause/Break
keys still can be used to respectively abort and pause transmission.