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DVB-T PTT
Posted: Thu Jul 01, 2021 11:32 am
by 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
Re: DVB-T PTT
Posted: Thu Jul 01, 2021 12:04 pm
by 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
Re: DVB-T PTT
Posted: Thu Jul 01, 2021 5:59 pm
by 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
Re: DVB-T PTT
Posted: Thu Jul 01, 2021 9:04 pm
by 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
Re: DVB-T PTT
Posted: Fri Jul 02, 2021 6:35 pm
by 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