PTT on Portsdown 4

[g3yjr]

I want to use a sequencer to ask PD4 to go to Tx and the same for Langstone.

I can see from https://wiki.batc.org.uk/Portsdown_4_GPIO_Connections that pin 11 is Langstone PTT Demand In. Is it the same pin for Portsdown 4?

Graham

[G8GKQ]

Hi Graham

The Portsdown 4 is not designed to be used with a touchscreen and PTT demand. For repeater use (without a touchscreen) the PTT demand is on GPIO pin 12, but this is not compatible with touchscreen operation.

Dave

[g3yjr]

Thanks for the info Dave, really I was looking to trigger the sequencer (maybe from my PTT pedal) and for that to get PD4 to Tx, bypassing the touchscreen soft-button entry, but displaying the red Tx "button" indication. That way PD4 is a slave to the sequencer.

But I can do foot and finger operation.

73 Graham