Eric,
You would connect the output from the external keyer to the "straight 
key" input of the rig in question.  I had a 746PRO and now own an 
Icom 756PRO III and they also have a straight key inmput.  I'll bet 
that the 703 has as well or perhaps the keyer jack is menu programmable.
Pat, K9JAU At 05:53 PM 10/7/2010, you wrote:
>Hello listers,
>I thinkI'm going to get the Logikey K5 electronic keyer for my HF rigs.
>
>These are a Kenwood TS480SAT and an Icom IC703 Plus.
>
>I haven't decided on a set of paddles yet.
>
>I do have one question, however.
>
>If I use an external electronic keyer with either of these two rigs do I =
>somehow have to disable the internal keyer in the radios?
>
>Also what jack do I hook one of these external electronic keyers to?
>
>The Kenwood has jacks for straight key and another for paddles.
>
>I haven't checked out the keyer inputs on the Icom rig yet.
>
>Any help would be appreciated.
>
>Thanks,
>
>73,
>
>Eric
>KU3I
>
>
>
>__________ Information from ESET NOD32 Antivirus, version of virus signatur=
>e database 5513 (20101007) __________
>
>The message was checked by ESET NOD32 Antivirus.
>
>http://www.eset.com