[Hackrf-dev] Input from Photodiode

[Rich Sanders]

That's an interesting idea.  You'll probably need an amp and most
importantly a capacitor for DC blocking.  You might also look at optical to
electrical converters, they are probably far more expensive than the hackrf
was.

On Sun, Sep 14, 2014 at 3:44 PM, Ian Davidson <IDavidson at micropack.co.uk>
wrote:

>  An unusual request here, HackRF folks.
>
>
>
> I'm looking at the possibility of using HackRF and SDR# (or similar) to
> detect the beating of two lasers on a fast photodiode.
>
>
>
> I know the frequencies of light and RF are several orders of magnitude
> different but if the lasers (or cavities) are any good (near single mode,
> stable etc)  then you *do* get a heterodyne beat (Google 'laser heterodyne
> spectroscopy' if you are keen).
>
>
>
> My question is - can anyone on the forum  offer me any thoughts on the
> best way to interface a Photodiode to the HAckRF input?
>
>
>
> Many Thanks
>
>
>
> Ian
>
>
>
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>
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