[amsat-bb] FT736R cable

[Greg Dolkas]

Exactly.  The transistor provides both the level shift and invert functions, so just connect it between the rig (TTL) and serial port (RS-232).

Greg. KO6TH


On March 24, 2015 5:47:19 AM PST, Daniel Cussen <dan at post.com> wrote:
>On 24/03/2015, Andre <sats at pe1rdw.demon.nl> wrote:
>> If fyou are going to homebuild you can skip the whole level shifter
>and
>> inverter.
>> Just get a usb to ttl cable an attacht the needed connector to the
>open
>> end of the cable.
>
>Just be aware, as already said the signal is INVERTED so a 1 is a 0
>and a 0 is a 1, so the logic level needs to be the opposite of normal
>RS232 TTL levels, so connecting a standard 5V TTL to a connector
>probably will not work with a circuit to invert the logic.
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