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Reply To: | Mike Duke, K5XU |
Date: | Tue, 28 Feb 2012 17:26:03 -0600 |
Content-Type: | text/plain |
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Whoever said that the two chips installed in the radio only send a TTL
signal to the DIN jack was correct.
One of the chips is a Ne4040, the other, I think, is an 8281.
If you are looking for that chip set, you can confirm those numbers
with numerous TS440 modification sites.
If someone is looking for them, I have a spare set of them somewhere,
since I bought multiple sets from Jameco in the early 90's rather than
buy one from Kenwood at double the price plus shipping.
To use the TS440 with a computer, you will also need the TTL to RS232
interface from Kenwood that was mentioned earlier, or you will need to
find an alternative circuit. I think I remember seeing one
specifically for the 440 a long time ago in QST, but I may be
mistaken.
Mike Duke, K5XU
American Council of Blind Radio Amateurs
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