Ultra PicoKeyer
27 January 2017 (Firmware V2.2)
Page 8 of 21
then close the dash paddle and release the dot paddle for the two dashes, then release the dash paddle and close the
dot paddle for the last dot. In Ultimatic mode, you would close the dot paddle and hold it closed, close the dash
paddle for the two dashes, then release it for the last dot. Some letters are easier to send and require less effort
using Ultimatic mode. It’s a little bit of an adjustment from regular iambic keying; it took me a couple of hours of
practice to get used to it.
Selecting a keying mode (A, B or Ultimatic) is largely a matter of personal preference. There is no one “right” way
that works for everyone; find which works best for you.
Two additional keying modes are available with the Ultra PicoKeyer. “Bug” mode (mode G in the setup menu)
offers automatic dots and manual dashes, emulating a mechanical semi-automatic key. Straight key mode (mode S
in the setup menu) allows completely manual sending, treating each paddle as a straight key input. This can also be
used in the same way you would a “cootie” key – like two straight keys back to back.
Keep in mind that you can always send stored messages, but you will not be able to record messages while in bug
or straight key modes.
Using Your Keyer with a Handheld or FM Rig (“MCW” Mode)
One of the unique features of your Ultra PicoKeyer is MCW mode (menu option “T” for sidetone, select “M” for
MCW). In this mode, the keying output can be used to trigger the PTT input of a VHF or UHF handie-talkie or FM
mobile rig, allowing you to use your FM rig for Morse code. This is not CW (Continuous Wave) operation, nor is
it true MCW (Modulated CW) mode – it’s really just an FM transmission, with audio Morse code tones sent instead
of voice. It is a good way, though, to have a CW practice net using a local repeater – with the blessing of the
repeater operator, of course – or a simplex frequency. Those participating don’t need HF privileges or HF
equipment to learn and practice Morse code on the air.
It is not possible to give detailed instructions for attaching your keyer to every rig on the market. Different
transceivers, even from the same manufacturer, may require different setups to work well. You will need to take a
look at your rig’s manual to determine how the audio and PTT signals from the keyer need to be connected. Look
for instructions for connecting a packet radio TNC for a good start. Doing it wrong could possibly damage your rig
and/or your keyer! Refer to the operator’s manual for your rig for specific requirements for PTT and audio.
Using MCW mode will probably require making a custom cable to connect the keying and sidetone outputs to your
FM transceiver. Depending on your radio you may also need to install a shorting jumper across capacitor C3,
and/or you may need to use an external variable resistor to control the audio level supplied to your transceiver.
Figure 1 - Keying Yaesu and similar HTs
In Figure 1, we see the most common method that will work
with many handheld transceivers from Alinco, Yaesu, Icom
and others that use a similar combined audio/PTT scheme.
This value of the capacitor is not critical, and can be several
times smaller or larger. A 2.2 kΩ or 2.7 kΩ resistor (3.9 kΩ
for some ICOM handhelds) is used in series with the PTT
line to key the rig. In most cases, GROUND is connected to
the sleeve (barrel) of a 2.5 mm stereo plug, and PTT/Audio
is connected to the tip – but again, be sure to consult your
rig’s manual.
