[Flexradio] SDR-1000 X2 External Control connector question

There are seven open collector control pins that can be configured with the External Control Tab to go logic high on either transmit or receive depending onhow youm configure them. I am seeing + 0.6V whenhigh. Is that correct? Doug K4LY ___ FlexRadio

Re: [Flexradio] SDR-1000 X2 External Control connector question

I think they are talking about TTL logic levels - read up on TTL transition levels on google. IIRC, HIGH is maybe 3-4V. Jerry W4UK At 02:38 PM 1/12/2011, Doug Allen wrote: There are seven open collector control pins that can be configured with the External Control Tab to go logic high on

Re: [Flexradio] SDR-1000 X2 External Control connector question

Doug, As you noted, the X2 outputs are open-collector. Logic High turns the transistor on, which will result in a collector-to-ground voltage of a few tenths of a volt. Logic Low turns the transistor off, resulting in the collector voltage rising to whatever the pull-up voltage is in the device