+3
I have also built many of these per Ed's suggestion to build it into the
DE9 housing. Never had an issue. 73 jeff wk6i (at W7RN today)
On Sat, Feb 24, 2018 at 7:01 AM, Jay <ws7ik7tj@gmail.com> wrote:
> +2
> I have also used these interfaces for a long time. Both transistor and
> also opto's. Only thing I found was that in PTT part that different
> radio's require much different resistor values. Even two old FT-1000's
> required different values. From 500 to 1500 ohms. FSK was never a problem.
>
> Used Opto's when the computer had built in com ports 100% to just protect
> the computer as on-board problems that might have been caused -- never did
> see any difference in performance so went back to 100% transistors as they
> fit better in a connector and don't require a box.
>
> Jay WS7I
>
>
> +1
>> Since 2003, I've made over 75 of these interfaces for Kenwood,
>> Icom, Yaesu and Elecraft radios. I wire the components point-to-point
>> inside the DE9 connector hood that connects to the Serial port. (If the PC
>> doesn't have Serial ports, then I use the Edgeport USB-Serial adapter.)
>> The other end of the cable has the appropriate connector for the specific
>> radio. The result is a single cable that has worked perfectly in all
>> cases.
>> I've never found the need for an opto-isolator solution that some people
>> use instead of the resistor-transistor level-shifter circuit on Don's site.
>>
>>
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--
Jeff Stai ~ wk6i.jeff@gmail.com
Twisted Oak Winery ~ http://www.twistedoak.com/
Facebook ~ http://www.facebook.com/twistedoak
RTTY op at W7RN
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