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Tuesday, 27 December 2016

More Sequencing Secrets

Well,

I've added a FET switch to the sequencer I made last time. The FET switch will provide +12V on RX to the masthead and will be used to switch the masthead relay and also power the VLNA.

The schematic looks like this:


and it's built on the same bit of veroboard as the sequencer:



It switches very quickly, here in blue is the PTT being enabled and in Yellow the power supply that will head up the mast:



So we will then have 200+ ms delay before EVENT 1 from the sequencer:


which will be used for things like turning on the PA bias and enabling RF 'n' stuff like that.

All in all this is coming on nicely.

Local conditions.

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