The MK-1100 multi-keyer is no longer in production. Software support for them will continue in WriteLog.
The MK-1100 multi-function keyer is a device that connects to your PC via a serial port and provides a variety of functions needed for a contest operation. It functions as a switchbox for SO2R (single-operator, two-radio) contesters, but SO2R is not the only reason you might need a multi-keyer. All multi-keyer functions work on Windows 95, 98, Windows NT, Windows 2000, and Windows XP.
Front panel (prototype photo--production model has slightly different lettering)
Back panel (prototype photo--production model has slightly different lettering)
There are three connections you must make to the multi-keyer, and there is one function you must use in order to use any of the other functions:
1. Power. The keyer requires between 7.5V and 25V DC at P9 in either polarity. The keyer draws about 100 mA.
2. You must connect RS-232 from your PC to the keyer connector labeled "PC". Use WriteLog's Setup Port... menu to indicate which COM port you are using on your PC. Version 10.10 or newer of WriteLog is required. In the same menu, select the W5XD multi+ keyer to the lower left.
At this point you can test whether the keyer is connected properly:
after an OK to the Setup Ports dialog, look at the status line at the bottom of
the main WriteLog screen. It should read out the keyer speed in WPM. Change the
speed with Page up/Page down. If it says "timeout", then step (1) or (2) is not
correct yet. (It is possible to configure WriteLog to not have the status line
at the bottom of the screen. Use the View menu to turn on the Status Bar check
3. You must use the multi-keyer to generate CW to enable the keyer's other
features. This means the only CW output will be from the CW L and R connectors
on the keyer (or, alternatively) the TTL levels on pins 17 of the Antenna Relay
25 pin D connectors.
4. You may connect CW paddles to the keyer.
5. You may connect receiver audio to Rec Aud L and R, which the keyer will route to HD PH for your headphones
6. You may connect a rig's PC control port to the Rig connector. This way, a single COM port supports both PC control of a rig and control of the multi-keyer.
7. You may connect to the antenna relay, PTT, and/or CW outputs on Ant Relay separately for L and R rigs.
8. The keyer has a CW side tone circuit that can be disabled with internal jumpers, and whose pitch and other options can be controlled by INI file options from WriteLog.
9. The keyer comes with a small remote control box that has a CW speed knob and a manual Left/Right toggle switch. Both of these functions are operational even if WriteLog is not running.
The MK-1100 has both left radio and right radio PTT outputs, and for each radio, it has a TTL level on the 25 pin LPT jack, and a optically isolated on/off output in a mini stereo jack. The TTL output and the on/off output are internally connected to each other and have the same signal on them. And the keyer outputs either on the left or the right radio under control of WriteLog, which can be overridden by the manual toggle switch. The PTT and the CW output always go to the same radio.
Three different actions may cause the MK-1100 to turn on its PTT, and you may use WriteLog's CW PTT Setup Dialog to set the keyer's behavior:
There are two bugs in WriteLog prior to version 10.38 that affect the way you want to set this up:
Note that in many stations--especially for modern positive-keyed tranceivers--the isolated ground available on the stereo CW output and PTT output jacks is not needed, and you can substitute a less expensive and off-the-shelf monophonic connector and cable assembly (a connector that has no "ring" contact) for the CW and for the PTT cables in your station.
Inside the keyer are 4 dip switches and one volume control potentiometer.
Opening the case
The top three DIP switches can be turned off to disable the keyer's side tone audio. The factory setting is ON. If you turn those top three switches off, then the keyer no longer shares a ground with your rig's audio, which can be useful if you have a problem with an audio ground loop.
SIDETONE VOLUME POTENTIOMETER
The potentiometer controls the volume of the CW sidetone. The pitch of the sidetone and other selections can be made in the writelog.ini file.
The paddle action is the standard iambic behavior: pressing the dot paddle sends dots, and the dash paddle sends dashes. The keyer implements dot/dash memories: at any time after a dot has begun, if the dash paddle is closed, the keyer "remembers" to send a dash after the dot. And the same for closing the dot paddle during a dash.
Adding another dot after the end of a dot requires holding the paddle down until the beginning of the second dot. And similarly for sending another dash after a dash: you must hold the paddle down until the second dash starts, else the keyer will only send the first one.
At this time we do not have an electronic version of the Multi-Keyer circuit diagram. However, it is similar to the older design here: (page 1) (page 2). The new design adds opto-isolated PTT outputs, a foot switch input, and a self test switch.
The ability to set the RS-232 RTS/DTR outputs and read the CTS/DSR inputs is required in order to control the keyer. Here is a zip file, KeyerDemo.zip, containing some software routines in C++ that drive this keyer using the Win32 API.
This page updated 1 November, 2005