Martin Klingensmith wrote...
> Sent: 11 October 2005 17:10
> To: Microcontroller discussion list - Public.
> Subject: [EE] RF filter
>
> To get to my question: I will have to hook up a 2GHz spectrum analyzer
> to help aim the dish. I would like to block the DC. Can I build an
> adapter with a small value capacitor and expect it to work? Keeping
> leads short and everything shielded as best I can, etc.

You probably can, Martin, as long as you only want to make relative
measurements. When I do this sort of thing at work, I use a 3dB coupler
which is automatically dc blocked (as long as you use the right ports!),
which splits the RF signal 50:50 between the analyser and the reciever.

You can also get splitters made to split domestic satalite LNBs in the same
sort of way, and I would imagine that only one port of these would pass DC.

Cheers...Mike.

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