The two chips needed for the TS-440 digital interface are the uPD8251A and
any CMOS 4040 (many manufacturers).
Jameco still stocks the 8251A for about $4:
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=52652
Just about every major electronics supplier sells 4040's. They're about 40
cents each. You want the 16-pin DIP package.
Mine has been going strong for many years. I did have to clean off all the
glue from the VCO board because it was showing the dreaded VCO unlock
"dots" on the display.
73, Zack W9SZ
On Thu, 8 Nov 2007, Chet Moore wrote:
> Rick
>
> Probably the most important thing I would want in SS is computer logging
> and to be able to click on spots using N1MM or any of the other computer
> logging programs. The TS-440 as it came out of the box has a computer
> interface plug on the back BUT.............. you have to buy the 2 chips to
> enable the handshaking between the 440 and the computer. If the 440 has
> those chips installed you are ready to go.
>
> My understanding is that Kenwood no longer has the chips available. That is
> what i was told by the local kenwood dealer. I ended up purchasing the kit
> that provides everything needed by a private dealer. I think it was $60.
> It does require you to open the front panel and plug in the two chips. Mine
> worked like a champ.
>
> I don't know if the 746 has a computer interface. I used my TS-440 when
> sailing merchant marine.. I had the mod in mine that allowed me to xmit on
> 2 - 30 mcs so it was a nice backup for my shipboard xmtrs and I also had the
> 500 kc cw filter. There is an SSB filter which would really help on SSB in
> a crowded band scenario such as SS SSB. I used my 440S (AT) to make in
> excess of 120 K on both modes and thought it was a terrific radio. My next
> radio was an MP-1000. After putting those radios side by side its obvious
> that the 440S has some limitations.
>
> Perhaps some one else can fill you in on the Icom 765 and if it has a
> computer interface, then you will be able to make a more accurate choice.
>
> I would have to look in my check book to find out who it was that I
> purchased my computer interface kit from. They do have a web site but it
> was over a year ago and i don't rember the company name. They shipped
> quickly but it still took 4 or 5 days to get the kit in the mail.
>
> press on regardless
>
> 73
>
> Chet N4FX
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