K1EL
WKUSB with WinKeyer3 User Manual
WKUSB
WKUSB User Manual
12/20/2017 Rev 1.0
Page 41
T [nn] - Set PTT Tail Time
:
WK provides a transmitter PTT output that can be used to switch a transmitter or
linear amplifier over to transmit mode in advance of actual CW keying. You have control over the time delay
between when PTT is asserted and when CW keying will start, this is lead-in. You also have control over how
long the transmitter will stay in transmit after keying has stopped; this is tail delay. The tail delay is handled
differently for CW sent by paddle and CW sent by message. Paddle delay is controlled by the Hang Time setting
while message PTT delay is controlled by the Tail setting. The formula to calculate tail time is:
Tail Delay = Three Dit Times + (Tail Setting
times
10 milliseconds)
Examples:
At 20 WPM, Tail set to 7, Tail Delay = (3x60)+(7x10) = 250 mSec
At 40 WPM, Tail set to 7, Tail Delay = (3x30)+(7x10) = 160 mSec
At 20 WPM, Tail set to 0, Tail Delay = (3x60)+(0x10) = 180 mSec
At 15 WPM, Tail set to 55, Tail Delay = (3x80)+(55x10) = 790 mSec
Lead-in Delay
Tail Delay
PTT
Key
The letter A
PTT Lead-in and Tail Timing Example
In general we want a very short tail time when sending messages and we want PTT to stay asserted
between letters while sending with a paddle set. That’s the reason the delay is dictated by two mechanisms.
U - Turn Autospace Mode Off and On
When autospace is enabled WK will automatically insert proper
inter-letter space between letters. Each time the
U
command is issued WK will toggle between modes
responding with an
A
for autospace enabled an
N
for autospace disabled.
Here is how autospace works: If you pause for more than one dit time between a dit or dah WK will interpret this
as a letter-space and will not send the next dit or dah until the letter-space time has been met. The normal letter-
space is 3 dit spaces but this can be increased by using the
I
command. WK has a paddle event memory so that
you can enter dits or dahs during the inter-letter space and WK will send them as they were entered. With a little
practice, autospace will help you to send near perfect Morse. If autospace seems to be less forgiving than you
like, you can increase the letterspace setting to relax the timing.
V [nn] - Keying Compensation
allows a fixed amount of time to be added to the length of all dits and dahs.
QSK keying on modern transceivers can cause shortening of these elements which is especially noticeable
at high speeds. WK allows the length of the elements to be increased uniformly to compensate for this. The
adjustments can be made in one-millisecond steps. The maximum adjustment is 31 mSecs. Key
compensation is very similar to Weighting in that any adjustment added to the dits and dahs is subtracted
from the spacing so the resulting speed is not changed. The difference between weighting and keying
compensation is that compensation is independent of speed, so if 10 mSec of key compensation is selected,
10 mSec will be always be added regardless of speed. So be careful at high speeds with large values of
keying compensation, dits and dahs may run together with no spacing at all.
Letter R without compensation
Letter R with compensation
nn
Key Compensation Timing
