Portsdown 4 PTT

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
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m0pnn
Posts: 22
Joined: Wed Oct 03, 2018 1:16 pm

Portsdown 4 PTT

Post by m0pnn » Tue Jan 19, 2021 7:12 pm

Hi

I've been asked to find out which pin is now used on the Pi 4 for PTT, please.

Cheers

Paul
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G8GKQ
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Joined: Sun Mar 22, 2009 1:21 pm

Re: Portsdown 4 PTT

Post by G8GKQ » Tue Jan 19, 2021 7:25 pm

Paul

An easy search of the Wiki brings up this page: https://wiki.batc.org.uk/Portsdown_4_GPIO_Connections

Pin 40. No change from the Portsdown 2020.

Dave
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m0pnn
Posts: 22
Joined: Wed Oct 03, 2018 1:16 pm

Portsdown 4 PTT

Post by m0pnn » Tue Jan 19, 2021 7:32 pm

Hi

Dave

Thanks for your reply he can see no voltage on pin 40.

Cheers

Paul
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M5TXJ
Posts: 347
Joined: Wed Jul 05, 2017 8:34 pm

Re: Portsdown 4 PTT

Post by M5TXJ » Wed Jan 20, 2021 11:35 am

Hi Paul,

How long is the OM waiting after selecting TX? Is he aware of the 12 second delay in going to TX to avoid spurious emissions?

73 Dave.
...are you sure I can't use a pair of 813's?... :shock:
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m0pnn
Posts: 22
Joined: Wed Oct 03, 2018 1:16 pm

Re: Portsdown 4 PTT

Post by m0pnn » Wed Jan 20, 2021 4:11 pm

Hi

Dave

Thanks for the reply.
I have done some reading and did notice that :D . I am not sure what build he is running and with everything that's going on at the moment. It's not making it easy doing it over the air or by phone. There is three of them building Portsdown 4 sharing info sure they will get there.

Cheers

Paul
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