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Poor mans Portsdown
Posted: Sat Jan 13, 2018 4:24 am
by VK5BI
The BI PI a DATV TX based on the U2790B modulator.
Next step is to getting it driving my 1296mhz, 5.7ghz and 10ghz transverters.
Wayne VK5BI
Re: Poor mans Portsdown
Posted: Sat Jan 13, 2018 3:29 pm
by G8GKQ
Hi Wayne
Great idea! Do you simply switch in appropriate LC filters for the IQ signals?
It would be good if you could publicise the circuit design to allow others to follow suit.
Dave, G8GKQ
Re: Poor mans Portsdown
Posted: Sat Jan 13, 2018 9:51 pm
by VK5BI
Thanks Dave,
the IQ filtering if done with 2 of the boards from the digilite era in CQ-TV252. These are switched with the 4 pole toggle switches.
Photo of the very rough looking modulator board below.
Wayne VK5BI