Poor mans Portsdown

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VK5BI
Posts: 18
Joined: Mon Mar 30, 2015 9:32 am

Poor mans Portsdown

Post by VK5BI » Sat Jan 13, 2018 4:24 am

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
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G8GKQ
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Posts: 636
Joined: Sun Mar 22, 2009 1:21 pm

Re: Poor mans Portsdown

Post by G8GKQ » Sat Jan 13, 2018 3:29 pm

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

VK5BI
Posts: 18
Joined: Mon Mar 30, 2015 9:32 am

Re: Poor mans Portsdown

Post by VK5BI » Sat Jan 13, 2018 9:51 pm

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
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modulator.jpg
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