I have used a 2n2222 and one-K resistors (ie. CT circuit) on a 990 without
problem. Used the same interface on the Mark V too before switching to a
Rigblaster Plus. The same interface works well on my FT-100 whereas a
optoisolator interface would not work.
GL, Don VE3XD
> -----Original Message-----
> From: writelog-bounces@contesting.com
> [mailto:writelog-bounces@contesting.com] On Behalf Of J. Allen
> Sent: Thursday, July 08, 2004 10:27 AM
> To: john@wa9als.com; writelog@contesting.com
> Subject: [WriteLog] Help with FT-990 RTTY Interface
>
> I changed the thread name to match where we are with this problem.
>
> Many comments to me ask about the interface type. It is the
> type that has a pair of 2n2222 and one-K resistors. It is
> fairly simple, and I plan to test it for operation on the bench.
>
> It has been suggested by some that the 990 needs
> Optoisolators, and by others that the transisitors are the
> correct interface.... Does anyone have a 990 that works and
> knows which devices the interface should have. I have been
> told by several people that the 990 interface works exactly
> like the 1000. Again, does anyone know for sure, and if so,
> which type of interface works?
>
> J.
> VY1JA
>
>
>
>
>
>
>
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