Beginning with NA Version 8, provisions were included to allow a keyer paddle to be connected to the computers LPT port to manually send CW. The W9XT Contest Card from Unified Microsystems was originally designed prior to NA8, and therefore did not include paddle capability. Fortunately, this feature can be readily added to the Contest Card. Courtesy of Gary Sutcliffe, W9XT of Unified Microsystems, heres how to do it. But first, a few words from our sponsor:
CAUTION: Making these modifications could void the FCC Class B certification of the Contest Card. It will be your responsibility to see that proper steps are taken to prevent interference to nearby radios, TVS, etc. If interference occurs, you must stop using this device until you correct the problem. Furthermore, making this modification will void the warranty if, in the opinion of Unified Microsystems, damage occurred because of improper modifications or poor workmanship in making the changes.
Note: If you are using the optional RECORD switch (not required with NA), one side may already be connected to pin 5. Both the paddle COMMON and the record switch GROUND wires may be connected to pin 5 if both are used.
Here is a photo of a modified contest card. At the lower right the resistors added in steps 2 and 3 are clearly visible. The wires added in steps 1, 6 & 7 are also located in this area. The long wires added in steps 4 and 5 stretch from the resistors across the bottom to the lower left where these make connection to the pins of the DB-25 connector.
Some K8CC construction tips:
Paddle connections to the Contest Card are made as follows:
For more information on the W9XT Contest Card, visit the Unified Microsystems web page at http://www.QTH.com/w9xt, or e-mail W9XT at firstname.lastname@example.org.
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