DVB-T PTT

[M0PIT]

Having upgraded my Portsdown 2020 to the latest version of software 202106070, when using DVB-T there is no PTT signal appearing on the 8 Band Decoder. The issue only appears to be with DVB-T, as the all the other Modulations work correctly, i.e. the PTT signal appears after about 10 seconds.

Is there an option in the Menu that I need to change for PTT to work with DVB-T?

Phil
M0PIT

[G8GKQ]

Hi Phil

I've just tested it on my development Portsdown 2020 and it works OK.

Make sure that you have a valid video input mode selected, otherwise it won't work.

Dave, G8GKQ

[M0PIT]

Hi Dave,

Thanks for the speedy reply as always.

I've been looking a bit deeper, the PTT works perfectly on DVB-T with the Lime firmware 1.30, but when I use the Lime firmware DVB, the PTT fails to work when the Portsdown is configured to use DVB-T.

Hope that points you in the right direction.

Regards,

Phil
M0PIT

[G8GKQ]

Hi Phil

Does it generate DVB-T with the LimeDVB firmware? I did not think it was possible, and that will be why the PTT does not work (as it checks for correct operation of the transmitter before switching the PTT).

Dave

[M0PIT]

Hi Dave,

I can confirm that with the DVB firmware running on the Lime there is no output from the Lime when trying to transmit DVB-T.

Therefore I can deduce that, the Lime DVB firmware doesn't support DVB-T and that I need to use the Lime 1.30 firmware when transmitting DVB-T.

Thanks for your help,

Phil
M0PIT